Bandage of anchor winding of electric machine

FIELD: electro-mechanical engineering.

SUBSTANCE: bandage of electric machine anchor winding is made in form of continuous solid coiling, coil to coil, in a layer of isolated wire of magnetic or non-magnetic material at whole axial length of bandage section of winding, which does not have other means of radial attachment. The bandage contains even number of wire layers with a lock of beginning and end of coiling on one of end sides. Below each single or double layer of wire, an insert ribbon is positioned which envelopes the anchor surface being bandaged in one layer and which is made of non electro-conductive reinforced material containing axially oriented direct threads rigid to stretching. Aforementioned insert ribbon is provided with collar stops on external surfaces along end edges. Collar stops are longitudinally reinforced with wire or non-metallic filaments rigid to stretching. Axial distance between their internal stopping surfaces is equal to axial size of surface being bandaged.

EFFECT: simplified construction, ensured maximal technically possible reduction of losses to vortex currents, ensured stable reliability.

4 cl, 8 dwg

 

The invention relates to the field of electrical engineering and relates to improvements in devices multilayer wire brace attachment winding on a cylindrical armature of the electric machine.

Multilayer wire ties securing the windings on the cylindrical rotors (in particular, the anchors) electric machines are known. They are usually performed in the form of a continuous winding turn to turn in the layer wire of magnetic or nonmagnetic material - bronze and non-magnetic steel (Alekseev AE Design of electrical machines. M.-L., Gosenergoizdat, 1958. Str, 186). Used tinned wire, steel banding -- according to GOST 2333-80. Steel wire. Types (page 6), for which the possibility of non-metallic coatings (in particular, polymers) specified in the current standard are provided.

Use tinned wire in the construction of wire bands at anchor electrical machines connected exclusively with the traditional "tin" soldered their subsidiary units-locks and fastening elements, preventing the bandage from cross razvarivaniya and mezhdunaradnyh holders. In some cases it is caused by the necessity of obtaining (solid propanol) monolithic cross-section of multilayer bandage in the construction of high-speed machines.

It is time consuming, but t is chelovecheski simple and reliable technical solution. However, it has important disadvantages. Chief among them is the large thermal losses from eddy currents in the circuits formed by the transverse (relative to the direction of the main actors in the brace and accordingly the winding of the wire; in the coordinate system of anchors and the machine - axial) galvanic connections between the longitudinal conductors in the wire layers of the bandage.

The General idea is to overcome this drawback is the creation of the bandage without cross (see above) galvanic connections between the metal ring of power elements that make up the bandage.

This idea has found application in a number of engineering developments.

It is known, for example, offer to perform the bandage frontal part of the armature winding of the electric machine in the form of a package vyshtampovannyj from leaf ring metal plates electrically insulated from one another" electroconductive coating (Ed. mon. The USSR №871276, CL NC 3/50). In this band there's no lock, excludes unwinding and, most importantly, there is almost no losses from eddy currents.

However, to make this package, taking into account the ratio of the cross-section and diameter, is apparently impossible. You cannot create in this band directed toward the center of rotation of the preliminary radial pressing Bandirma winding. Provided here is the preload of the frontal part winding to gangs is Zhu inside with emphasis conical element in hard abodominal - directed outward, i.e. radially pushes the winding of the groove in place of its entrance. This, of course, unacceptable.

To ensure the sustainability of the rings band in action on each of them arching inside radial forces shroud package should be tightly compressed. However, here made of elastic axial preload, and even in statically indeterminate scheme with simultaneous radial thrust split taper bushing frontal part winding from the inside (see above). In the result, or the package band will be compressed, or the frontal part winding will pojate to him. Stability sheets-rings package bandage will ensure it is impossible. Itself sleeve with a conical pressure element against axial movement is not fixed, and the vibration of the engine force of the elastic emphasis in the package bandage will be squeezed out.

It seems that the above mentioned disadvantages of the discussed design preclude its usefulness.

The second typical example of the realization of the idea of eliminating from the construction of the bandage paths of the eddy currents is a two - layer wire brace of tinned wire with a traditional system of cross-soldered tin elements of the General Assembly (Alekseev AE Design ... Str, Fig.5-42 - prototype). In him "not to have excessive losses and heating ..., if CC is adce is Solonovka coils from each other fine, flexible micanite or, better, asbestos ...".

However, in this bandage theoretically correct goal is not achieved, because of its design conveys an important drawbacks:

a) still a large number of transverse conductive linkages, forming paths for eddy currents;

b) turn-to-turn insulation thin, flexible micanite or ... asbestos" is, apparently, a separate strip that is not able to ensure the uniformity of the layer and the stability properties of such isolation.

In addition to these, other important, constructive-technological shortcomings discussed bandage-prototype:

(a) in comparison with the conventional performance dramatically increases the complexity of the operation overlay bandage repeatedly interrupted by the necessity of installation of insulating spacers;

b) in this regard, according to Fig.5-42 (see above), are isolated from each other, not separate coils of wire, and their group; thermal efficiency measures reduce losses in the bandage from eddy currents is, of course, decreases;

C) if adopted here, the design and the execution of inter-turn insulation to wrap the entire bandage tightly round - not; therefore, the band turns "loose" with a reduced coefficient of linear filling layer

,

where D is the diameter ol the drawing dies;

n is the number of turns in the layer;

L is the axial dimension Bandirma surface;

g) a similar effect underutilization of the volume of the retaining space, the system creates cross "tin" links and locks on the placement of their elements under the mesh layer. In such places pressure on the coil is increased, and in the next is missing, where the voids even after they fill in the impregnation impair heat transfer between the winding and the bandage. The total radial stiffness of the brace decreases;

d) on the placement of these auxiliary elements of the brace on the outside, over the wire layer, deteriorating the overall use of physical air gap along the bore length banded working part winding, such as local projections over the main - wire - layer bandage can be significant (up to 1/3) part.

Offer, according to the invention, the bandage above-mentioned shortcomings of the bandage of the prototype has not.

The objective of the invention is the creation of structurally and technologically simple and reliable design of bandage armature winding of the electric machine with the maximum technically feasible reduction of losses from eddy currents.

The solution to this problem, according to this development, is achieved by the fact that the bandage armature winding elec the integrity of the machine is made in the form of continuous winding turn to turn in the layer insulated wire of magnetic or nonmagnetic material throughout the axial length Bandirma part of the winding. The band has an even number of layers of wire with a lock at the beginning and end of the winding on one of the end sides. Under each single or double layer of wire is placed covering in a single layer Bandeira surface anchor strip-strip of electroconductive reinforced material containing axially oriented hard on stretching straight threads. This tape strip provided on the outer surfaces on face edges of the end collars of rectangular cross-section is rigidly and firmly embedded in them the ends of the threads of transverse reinforcement tape-strip. The end clamps longitudinally reinforced with wire or hard-tensile non-metallic filaments. The height of the protrusions stops-shoulders above the outer surface of the tape strip is equal to the diameter of the insulated wire or the thickness of the double layer, provided with an intermediate flat insulating strip between the layers, similar to the tape-laying, with transverse reinforcement, and axial length (L) between the inner surfaces of the lugs-clamps equals the axial dimension L Bandirma surface.

To reduce mechanical stress concentration in the interface of the inner surface of the stop collar with the outer surface of the tape strip under the action of wrecking the wire layer of the tire lateral forces - it is done is but with rounded, radius of which does not exceed half the diameter of the insulated wire.

For the most durable connection stops-clamps with cloth tape-strip and, through it, between the ends of the threads of transverse reinforcement tape-strip terminates in a stop-shoulders contour along the gorge to output them to the external cylindrical surface of the stop-collar.

Due to the fact that the height of the protrusions stops-shoulders above the outer surface of the tape strip is equal to the diameter of the insulated wire or the thickness of the double layer (see above), the total height of the stop-collar is equal to the total thickness of the wire part of the band, forming together with it a cylindrical surface of the outer geometric and physical constraints.

This creates the possibility of a continuous gapless coaxial pair not only two elementary layers of bandage, but the execution of monolithic multilayer bandages, made of dual layer.

The combination of these features of the proposed brace solves the problem of the invention:

a) very simple design: two-layer bandage over the whole length Bandirma surface consists of two main parts - wire and tape-strips - when one lock is the simplest design to the end;

b) equally simple technology; it is a continuous winding with a simple installation between SL is s one, the middle parts of the tape-strips - and with a simple, well mastered in the production run of the castle, for example, brazed on a collapsible tube;

in) provided marginal technically possible reduction of losses from eddy currents; is obtained by reducing, in fact, almost to theoretical limit educational opportunities contours of eddy currents in the metal band by the use of insulated wire;

d) guaranteed stable reliability, as a result of high quality manufacturing with very simple designs and technologies, as well as the possibility of long-term preservation of the mechanical and electrical properties of the bandage of operation due to the practical absence of heat by the eddy currents. This also contributes to the adopted implementation of the bandage with an even number of layers of wire, particularly in two-layer bandage than excluded tangential reaction between castle and Bandirma surface, inevitably accompanied by a weakening of the wire tension and extreme turns in bandages without solid propane with an odd number of layers (especially single layer).

Figure 1 shows the meridional cross-section of the active layer of the slot of the anchor is installed bandage proposed design - accommodation on each tape-strip one wire is Loya;

figure 2 - end view of the anchor node, shown in figure 1, with a section along the frontal part winding at its base;

figure 3 shows the meridional cross-section of the layer of the bandage area of emphasis-clamp (option 1);

figure 4 - same as figure 3, a two-layer variant;

figure 5 shows the overall design scheme for the research work of the bandage design espatula anchor (left - distribution of radial forces in stopover mode, on the right under the action of centrifugal force Rmwinding);

figure 6 shows the characteristics of the dependence of the forces P in the elements of the design scheme 5 from radial deformations Δ if WN<GB;the symbol ΩNthe designated area is unacceptable deformations;

7 - same as figure 6, when WN>WB,

on Fig shows the graph of the function f(β)characterizing differential dependence of the Pg(W′Bthe crossover centrifugal force Rgwinding from the radial rigidity of the W′Bthe bandage.

Constructive implementation of the proposed bandage armature winding of the electric machine is illustrated by the example of his use of the slotted design of anchors for fixing winding its working length (Fig.1-2).

The main element of the band - multiturn wire layer, made in the form of continuous winding turn to turn the layer insulated wire 1 from magnetic or non-magnetic material over the entire axial length Bandirma part winding 2. The band has an even number of layers of wire (in the example, the minimum is two) with a lock at the beginning and end of the winding on one of end sides of the barrel of the anchor (figure 1 and 2 is not shown).

Under each single (as in this example) or a double layer of wire placed the tape-strip 3 (figure 1), covering in one coat Bandeira surface 4 of the winding 2 anchors 5 (figure 2). Tape-strip 3 is made of electroconductive reinforced material containing axially oriented hard tensile strands 6, direct axial length Bandirma surface 4 of the winding 2.

This tape strip 3 is provided on the outer surfaces 7 by the end edges of the end collars 8 of rectangular cross-section is rigidly and firmly clamped at their ends 9 of the threads 6 of transverse reinforcement tape-strip 3 (Fig 3). The end clamps 8 longitudinally reinforced with wire or hard-tensile non-metallic filaments 10. The axial distance between supports l=L (see figure 1).

Pairing the inner surface of the stop collar 8 from the outside (under the wire 1) surface 7 of the tape-strip 3 is made with rounded radius R, which does not exceed half the diameter D of the insulated wire (3).

The ends 9 of the threads 6 of transverse reinforcement tape-strip 3 terminates in a stop-shoulders 8 contour on MicroTCA to radial output them to the external cylin the historical surface 11.

The height hyprojections stops-shoulders 8 on the outer surface 7 of the tape-strip 3 is equal to the diameter D of the insulated wire (3) or the thickness of the double layer(figure 4)with an intermediate flat insulating strip 12 of a thickness ofbetween the layers, similar to the tape-strip 3 - transverse reinforcement (see above), and with the thickness of the second layersimilar to the thickness of the first δWithL+D (figure 4). So

(similar to),

i.e. the total height δ0another clamp 8 is equal to the sum of the sizes of hyand thickness δLtape-strip 3. The result is a single cylindrical surface 11 on the whole width of the tyre - surface total external geometric and physical constraints, which creates the opportunity for continuous gapless coaxial pair of two elementary layers of the bandage (see figure 1 and 2) and perform multilayer bandages, made of dual layer.

Use midaglizole space from the outer surface 13 of the poles 14 of the armature 5 to the inner surface 15 of the magnetic core 16 of the stator (radial size bore δPfor bandage the design is developed in this proposal is characterized by the following geometrical relations (figure 1 and 2):

a) the technological gap (guaranteed pre-tension R0- see below)

,

where h0radial size (height) set armature winding 2 5 Assembly;

hP- the depth of the groove of the magnetic armature 5;

b) physical air gap

,

where δBthe thickness of the bandage.

The work proposed bandage consider the examples used in applications of the banding winding on the length of the working part anchors the two most common types: slotted and espatula.

Note first overall in both cases, the following useful features:

a) when using insulated wire 1 disappear interturn contours of eddy currents. Thus extremely reduced heat loss in the tyre, which in bandages conventional design - from bare tinned wire can be large, especially when the total propane just bandage;

b) the use of single-or double-layer strip 3 reinforced polymer containing, in particular, rectilinear transverse elements 6 of the valve (e.g., fiberglass), fixed ends 9 b is the lateral edges of the tape (stop-shoulders 8), - provides reliable protection razvarivaniya band width. When filling a polymeric binder in each layer of the bandage if the wound is formed practically indestructible orthogonal reinforced in the direction of the acting forces shell-monolith. At the same time eliminates a large number of various tinned clips and brackets with their mandatory propanol in the band (see, for example: Alekseev AE Design ... Str-186). Their use also creates a closed loop with the formation of these additional losses from eddy currents;

b) the second function of the specified tape-strip 3 - insulation from winding 2 (equivalent body) of the first layer of the bandage and the interlayer in the following. These required in conventional constructions of wire trusses additional elements such appointment, the proposed device is not required;

d) a brace in the form of a two-layer continuous wound unit as an independent object or item multilayer bandage - contains a single auxiliary structural element: the castle, mounted on any one of the ends of the bandage. Design them to adjacent circuit layers are known, simple and reliable. However, neither inside the band, nor in interaction with the surface 4 Bandirma construction no additional forces, in addition to stretching provolo and 1 inside the brace and the resulting useful radial pressing Bandeira surface 4 - no.

We will now examine the features of the proposed band in the slot and baspakova anchor.

A. If the slot anchor (figure 1 and 2) to apply the bandage according to the invention the groove is of the simplest form is rectangular with a depth of hPa smaller radial dimension (height) h0laid in the groove of the set winding 2 on the size of the technological gap δT. He is selected as the guaranteed absence touch the inner surface of the brace and the outer surface 13 of the poles 14 of the magnetic circuit of the armature 5 after preliminary precipitation of the winding 2 in the slots before the setting of the brace and the reduction of height h0:

radial pre-press R0established bandage;

- the action of radial forces of inertia (centrifugal) mounted in a groove set winding 2, as to radially deformable element;

the stress relaxation in polymer insulation materials compressed layers with corresponding deformation;

- drying insulation tangential layers.

The abrasion of the side surface of the insulation kit winding 2 by the friction of the walls of the groove when the change speed is eliminated prior radial load winding 2 R0that (see above) should avoid the loss of focus of the winding 2 in the bottom of the groove, i.e. it must be b is the larger of its greatest radial (centrifugal) forces of inertia R Min this mode (see below). Rational ratio of these forces, used a practice known (see, for example: Alekseev AE Design ... Str). For comparison, note that in traditional (odnoklikovoy layer) radial fastening of the winding in the slots of the perfect (in the sense of exact security given value of the pre-pressing R0and its uniform distribution along the length of the groove) this condition is even theoretically impossible. Vacuum impregnation of the finished anchor this disadvantage is completely not correct.

The features of operation of the slotted anchor of the bandage of the proposed design asmechanicalsystem - when using a wire of magnetic and non-magnetic material, are equal.

Asmagneticmachine system with slotted anchor the proposed bandage depending on the wire material 1 is different.

The action of the bandage frommagneticsteel wire 1 on the magnetic field of the machine in two ways:

a) an annular ferromagnetic layer, placed in the gap formed by bore δP(figure 1), creates an additional tangential flows scattering, which reduces the main radial - flow magnetic field of the machine;

b) for xed values of δPreduces magnetic resistance for radial components, sposobstvuyem the increase of the radial threads.

Quantitative assessment of this contradiction can, obviously, only be obtained when the detailed design of the machine. It should also be noted that when using the slotted anchor of the proposed band of magnetic steel wire 1 he firmly closes the exit from the groove in the gap formed by the bore, i.e. simultaneously with the above phenomena occurs an effect similar to the effect of closed or semi-closed slot (see figure 2). The usefulness of this in the fight against VG magnetic flux of the poles 14 of the famous and great.

The proposed band of non-magnetic wire 1 on the magnetic field of the machine is reduced to the estimated increase of the air gap by adding to the physical δInequivalent to the thickness of the band δB(figure 1). Due to the practical absence of the bandage eddy currents and, therefore, posed or more magnetic fields - new magnetic phenomena in this case does not occur.

B. the Proposed bandage when applied in the design espatula armature of the electric machine (Ed. mon. The USSR №394895, CL NC 3/46) as a mechanical system works in General, as well as in the anchor slot design. His work as an element of the magnetic system of the machine is also similar. However, the boundary conditions of mechanical loading and deformation elements are substantially different. Principal is but a variety of possible terminal States of the system. So consider her work in more detail.

The computational scheme for the analysis in the framework generally accepted in such cases, the plane problem of structural mechanics shown in figure 5. It is the two fixed base surface with a constant distance h between them. They form a linear system of coordinates rigidly connected with a common Foundation - the magnetic anchor.

Between the base surfaces included power circuit consisting of series-connected elements. This:

a) a radially elastic block H (called the "bottom"), consisting of elements of the carcass layer insulation (the index "K") and the corresponding insulation layer sets of tires winding with the index "W";

b) hard block M (symbol M - "copper") is the estimated weight of the wrapping of copper, the centrifugal force which RMit is considered external to the system under consideration. This is the main power factor, external loading and deforming the system;

C) radially elastic block B ("banding"), consisting of (elements) of block N and a sequence of connected with him radially elastic elements, the equivalent radial complianceand stiffnessthe bandage when it is obtained in the perceived from the M power.

Tension wire when winding the whole system pre is sustained fashion is compressed by the power of R 0with a total deformation Δ0.

The distribution of forces PNand RBbetween blocks H and B is determined by the ratio of their characteristics deformation under load. Find them.

Give block H

where its rigidity

The malleability of the block B (as indicated above, the radial elasticity of the insulation between the inner surface of the wire layer of the bandage and the outer surface bandainamco layer insulated winding accepted as the Cabinet)

.

where- give proper tires (see above);

the rigidity of the block B

or in expanded form

.

The deformation of the pre-compression force R0elements N and B (figure 5)

General pre-deformation system

The rigidity of the connection block M with the base system with limited movements

Postulate now a fundamental condition of health of the investigated system:

tensile reinforced in the direction of the force of the polymers in the power structures of unacceptable; therefore, when all raimoranta block H and the layers of the binder in its connection with the armature core and the block M should be compressed, i.e. should always be

.

From the correlation functions RN(Δand RB(Δ) (Fig.6 and 7) shows that under the action of force fMthe initial structure of the system is stored to the value of ΔMN. In this case the centrifugal force RM=PGon the border of the loss of carrying capacity of block N (i.e. conditional move it in stretched condition)

given the strength of the preliminary pressing R0forms stock

Find the dependence of the force RGdirectly from the radial stiffnessthe actual bandage.

Suppose RGaccording to the definition (7) taking into account formulas (5)

or expanded for analysis form (see formula (2))

The properties of this function will evaluate the dependence of

and in relative units on the ratio W′B=βGN

The function f(β) (Fig) shows that when the accepted assumption.(1) increase the radial stiffness of the braceintensively increases PGonly for relatively small values of. PR is β >1 the function f(β) quickly approaches the asymptotic value f(β)=0, i.e. even when absolutely radially hardthe brace stiffness of the block B (figure 5) GB≠∞but according to (2) also receives the asymptotic final value of WB=WN. In this case (see formulas (3) and (9))

i.e. without destroying the adopted analytical framework of the studied phenomena greatest (boundary - PG) the value of the centrifugal force of the winding ("copper") PMcannot be greater than the doubled value of the pre-tensioning force R0.

This is a fundamental result. He obtained under the condition of equality of radial podatlivosti λNthe "bottom" of block insulation and insulation layer copper winding metal wire" λPthe first layer of the bandage

,

that taking into account at this stage of the analysis conditions λB=0 defines

,

Change the result (12) can, obviously, only a change in the ratio of equality λNand λP.

When λNP(6) reliability banded according to the invention the winding system espatula anchors increases, especially in conditions of significant changes operating modes for RMS is barb:

,,

where RCstock for the conditions of postulate (6).

When λNP(7) the ratio of the opposite. With amplification (λN<<λPthis defines the inequality RG→P0and the stock of RC→0. In such a design, even a slight excess of the centrifugal force of the winding RMover the pre-tension force R0leads to the exit radial deformation ΔNthe "bottom" of the block N in the region ΩNinvalid its values. It is a violation of the postulate (6). The inevitable consequence is a loss of contact savandaryanagam winding layer with a magnetic anchor, i.e. a severe accident.

This situation using steklomontage in design espatula anchor traction motors of electric locomotives. This was the result of ignorance of the principles of attachment of the winding on the rotor of the electric machine designs with the use of reinforced polymers, as well as a misunderstanding of the meaning of such constructions as statically indeterminate mechanical system.

Thus, the initial applications of steklomontage instead of wire to the end parts of the winding slot of the anchor with wedge fastening her working part - criterion-is rantarou in comparison with waste in practice, the system of the wire trusses were made:

"allowable stress at break in the band choose not from conditions of strength and condition forminimum[underlined here] the elastic deformation of the bandage, do not exceed the permissible values for steel trusses, when testing the engine at an accelerating rate (Bocharov VI and other long-haul locomotives. Electrical machines and transformer equipment of locomotives. M., engineering, 1968. Str).

But when accelerating speed centrifugal force, stretching the bandage (and, consequently, its deformation) max. The radial components of these deformations give rise to power, shifting the winding in the output of the slots and thereby significantly worsen the working conditions of isolation. It forces you to take special measures to protect them here. Hence the requirement: maximum (not minimum) elastic deformation of steklomontage (i.e. when accelerating speed) must be no greater deformation of the steel so that the specified damage to insulation steklomontage the frontal part winding, was no more than usual.

Working conditions of steklomontage in baspakova anchor is much more complicated than their work on the frontal parts of the windings of the anchor groove design. As a result, the misunderstanding of these terms developers espatula anchor turned out to be deeper (see, for example, Bocharov V. the basic traction motors DC. Meters, Energy, 1976. Page 42-48).

Enough, for example, to pay attention to the following conclusions:

1) "during the rotation[underlined here] armature voltage steklomontazh along the length of the active part of the winding is practically not changed" (p.45). However:

a) "in rotation" - in what mode? Kolotova? Accelerating speed? Or all the same - at any speed "voltage ... 't change"?

b) this conclusion is obtained from the condition of equality (formula (19) on page 45) residual tension T0steklomontage after baking (p.43) and the tangential component′ CBS winding defined by the formula (17). However,CBS always directed from the center of curvature of the trajectorymass and therefore have a tangential components cannot. And, by the way, what is "badbanana isolation"?

2) "all CBS[underlined here] is perceived by the resin insulation layer [i.e., Cabinet - magnetic anchors - see figure 16 on page 44] after pre-compression will be equal to zero" (p.46).

"All" means, for the perception of even some share CBS winding the bandage is not necessary. This, of course, absurd.

In General the assumption of the ability (non-existent) carcass layer insulation virtually to work on radial stretching of the situation discussed earlier (see Fig.6 and 7, the region ΩN). Characteristics of R′ N(Δ∈ ΩN(see below ) and the corresponding characteristic P′M(Δ∈ ΩNfor CBS winding is shown by the dashed lines.

From the analysis of these graphs shows that in cases where the radial rigidity of the carcass layer insulation less than the brace (6) or more (7) - "all CBS" (in the General analysis it is the power of PM) almost completely absorbed by the bandage with a small addition of thrust P′Nfrom carcass layer insulation.

H0- remind (see above Postulate): this situation is unacceptable.

The examples show that with such an analytical device to get a true assessment of steklomontage as a mechanical system - it is impossible, as you cannot properly account for its main distinguishing features compared to the usual steel:

a)the modulus of elasticitywhen stretching steklomontage for espatula armature traction motor 0,45·104kN/cm2i.e.5 times less than that of steel- 2,1·104kN/cm2(Dumcius M.V., Moskalev L.A. Taran K.M. Method of determining the elastic modulus of oriented glass fiber. Sat. "Electrovozostroenie", t. Novocherkassk, 1972. Str-246);

b) about the same as below average allowable stress (see: 1) Bocharov VI and other Main ... Str. 2) A.E. Alekseev Design .. Str);

b) mechanical properties of steklomontage in operation decreased over time, it is recommended to take into account the decrease in the calculated allowable stress at 10-12% (Bocharov V. Trunk ... Str);

g) loss of preload of steklomontage when baking reaches 50% (Bocharov V. Becasue ... P.43).

Design and calculations performed taking into account these features and without methodological and computational errors have shown to create long-running espesaly anchor for locomotive traction motors DC at steklomontage on the length of the working part of the winding. This can only be done when using wire tires. However, the disadvantages of known constructions (see above criticism counterparts) do not allow to fully achieve the largest benefits besasavy anchors collector DC machines in comparison with the slot (Bocharov V. Becasue ... P.12).

This problem can be successfully solved only with the use of a wire band proposed in this development.

The ground work of the electric rolling stock and locomotives with traction motors DC is huge. Therefore, the usefulness of the performance of their anchors aspatame with the bandage of the developed design can be very large.

1. Bandage armature winding of the electric machine, done the config in the form of a continuous winding turn to turn in the layer wire of magnetic or nonmagnetic material throughout the axial length Bandirma part winding, containing an even number of layers of wire with a lock at the beginning and end of the winding on one of the end sides, characterized in that the insulated wire; under each single or double layer of wire is placed covering in a single layer Bandeira surface anchor strip-strip of electroconductive reinforced material containing axially oriented hard on stretching straight thread provided on the outer surfaces on face edges longitudinally reinforced with wire or hard-tensile non-metallic filaments by the end collars of rectangular cross-section is rigidly and firmly embedded in them the ends of the threads of transverse reinforcement tape-strip, and the height of the protrusions stops-shoulders above the outer surface of the tape strip is equal to the diameter of the insulated wire or the thickness of the double layer, provided with an insulating spacer between the layers, similar to the tape-laying, with transverse reinforcement, and the axial dimension between the inner thrust surfaces of the stops-clamps equal to the axial size Bandirma surface.

2. The bandage according to claim 1, characterized in that the coupling between the inner surface of the stop collar with the outer surface of the tape strip is made with rounded, the radius of which does not exceed half the diameter of the insulated wire.

3. Anda according to claim 2, characterized in that the ends of the threads of transverse reinforcement tape-strip terminates in a stop-shoulders contour along the gorge to output them to the external cylindrical surface of the stop-collar.

4. The bandage according to claim 1, characterized in that in performing its multilayer composed of two bands, each of which is provided with a separate lock winding.



 

Same patents:

FIELD: electric engineering and electro-mechanical industry, in particular, features of design of coils with salient poles for rectangular stators of salient-pole electric machine.

SUBSTANCE: in the coil for magnetic system of stator of salient-pole electric machine with rectangular poles, made by winding of flat rectangular cross-section bus onto narrow rib and containing elements of body and coil isolation with monolithic realization of working part of coil, in accordance to invention, on frontal parts of coil air gaps are provided between coils, expanding in wedge-like fashion in axial direction from the end of magnetic-duct of pole, in gaps between coils in longitudinal symmetry plane of coil distant inserts are installed made of solid isolating material with shape and dimensions, corresponding to gaps between coils in this plane, and with width substantially lesser than width of pole, connected by gluing to surfaces of adjacent coils, a packet of structural elements, consisting of frontal parts of coil rings and distant inserts between them, is fastened in longitudinal symmetry plane of the coil by bandage of non electro-conductive material, resistant to stretching, aforementioned inserts being of orthogonally symmetric H-like form with height of bar, equal to width of bus, and with common height, exceeding it by double bandage thickness, aforementioned bandage being positioned between shelves formed by aforementioned method. Due to such characteristic feature, all four sides of rectangular cross-section of each conductor within limits of frontal part of coil form surfaces, directly cooled by blowing air or liquid, correspondingly to scheme of theoretically full usage of external surface of conductors for their cooling.

EFFECT: increased efficiency of electric machine, increased density of current in windings, resulting in improved mass-dimensional characteristics of electric machine, decreased temperature of windings, and, thus, increased lifetime of isolation, allowing to use isolation of lesser heat resistance which is therefore cheaper or more technologically accessible.

8 cl, 10 dwg

FIELD: electrical and electromechanical engineering; rotors of large electrical machines such as turboalternators.

SUBSTANCE: proposed electrical machine rotor has heavy wound core whose winding coils are secured in end portions in radial direction by means of heavy metal banding rings fitted with one end on butt-end portions of core and with other end, on cylindrical surfaces of Z-section alignment rings; inner surface of alignment rings are joined with end portions of rotor shaft, two rows of slits being made in vicinity of mentioned rotor-shaft or banding-rind junction surfaces of each alignment ring uniformly and tangentially disposed over circumference of the latter in relatively staggered manner. One row of mentioned slits can be made in mentioned zones within alignment ring and other row, on rotor shaft surface jointed to alignment ring, for instance in the form of cooling ducts.

EFFECT: enhanced reliability due to additional reduction of alternate stress in zone where banding rings are fitted on rotor core.

1 cl, 2 dwg

The invention relates to the field of electrical and electric engineering, in particular to the construction of large electric machines, mainly turbogenerators and hydrogenerators, and more particularly to the fastening elements of the winding in the slots of the core

The invention relates to electrical machines, namely, devices for closure (closure) of the slots, and the system circuit filled with conductive rods or reels of the slots of the stator body of sheet steel electrical machines with end locks grooves, which consist respectively of the upper prismatic body, on the lower side of which has a surface that passes obliquely, and a lower prismatic body facing to the upper body, the surface of which is inclined relative to the bottom surface of the upper prismatic body in the opposite direction, and direct the jamming may be accomplished by relative displacement of both prismatic bodies

The invention relates to Electromechanical transducers mechanical energy into electrical energy to create a powerful pulse of energy sources intended for use in power systems large thermonuclear devices, lasers high power in other areas of technology

The invention relates to electrical engineering and can be used in transformers and electrical machines

The invention relates to the field of electrical engineering, namely electrical DC machines and can be used in the design of traction motors, ship crests electric motors, excavators and t

FIELD: electrical and electromechanical engineering; rotors of large electrical machines such as turboalternators.

SUBSTANCE: proposed electrical machine rotor has heavy wound core whose winding coils are secured in end portions in radial direction by means of heavy metal banding rings fitted with one end on butt-end portions of core and with other end, on cylindrical surfaces of Z-section alignment rings; inner surface of alignment rings are joined with end portions of rotor shaft, two rows of slits being made in vicinity of mentioned rotor-shaft or banding-rind junction surfaces of each alignment ring uniformly and tangentially disposed over circumference of the latter in relatively staggered manner. One row of mentioned slits can be made in mentioned zones within alignment ring and other row, on rotor shaft surface jointed to alignment ring, for instance in the form of cooling ducts.

EFFECT: enhanced reliability due to additional reduction of alternate stress in zone where banding rings are fitted on rotor core.

1 cl, 2 dwg

FIELD: electric engineering and electro-mechanical industry, in particular, features of design of coils with salient poles for rectangular stators of salient-pole electric machine.

SUBSTANCE: in the coil for magnetic system of stator of salient-pole electric machine with rectangular poles, made by winding of flat rectangular cross-section bus onto narrow rib and containing elements of body and coil isolation with monolithic realization of working part of coil, in accordance to invention, on frontal parts of coil air gaps are provided between coils, expanding in wedge-like fashion in axial direction from the end of magnetic-duct of pole, in gaps between coils in longitudinal symmetry plane of coil distant inserts are installed made of solid isolating material with shape and dimensions, corresponding to gaps between coils in this plane, and with width substantially lesser than width of pole, connected by gluing to surfaces of adjacent coils, a packet of structural elements, consisting of frontal parts of coil rings and distant inserts between them, is fastened in longitudinal symmetry plane of the coil by bandage of non electro-conductive material, resistant to stretching, aforementioned inserts being of orthogonally symmetric H-like form with height of bar, equal to width of bus, and with common height, exceeding it by double bandage thickness, aforementioned bandage being positioned between shelves formed by aforementioned method. Due to such characteristic feature, all four sides of rectangular cross-section of each conductor within limits of frontal part of coil form surfaces, directly cooled by blowing air or liquid, correspondingly to scheme of theoretically full usage of external surface of conductors for their cooling.

EFFECT: increased efficiency of electric machine, increased density of current in windings, resulting in improved mass-dimensional characteristics of electric machine, decreased temperature of windings, and, thus, increased lifetime of isolation, allowing to use isolation of lesser heat resistance which is therefore cheaper or more technologically accessible.

8 cl, 10 dwg

FIELD: electro-mechanical engineering.

SUBSTANCE: bandage of electric machine anchor winding is made in form of continuous solid coiling, coil to coil, in a layer of isolated wire of magnetic or non-magnetic material at whole axial length of bandage section of winding, which does not have other means of radial attachment. The bandage contains even number of wire layers with a lock of beginning and end of coiling on one of end sides. Below each single or double layer of wire, an insert ribbon is positioned which envelopes the anchor surface being bandaged in one layer and which is made of non electro-conductive reinforced material containing axially oriented direct threads rigid to stretching. Aforementioned insert ribbon is provided with collar stops on external surfaces along end edges. Collar stops are longitudinally reinforced with wire or non-metallic filaments rigid to stretching. Axial distance between their internal stopping surfaces is equal to axial size of surface being bandaged.

EFFECT: simplified construction, ensured maximal technically possible reduction of losses to vortex currents, ensured stable reliability.

4 cl, 8 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to perfection of borehole generators, particularly, to support and limitation of displacement of stator coils arranged in the engine housing. Borehole motor has tubular housing elongated in lengthwise direction, stator part arranged therein, stator coil winding looped back in the stator by end turn with tip. It comprises connector to connect at least one of coil windings and housing end abutting on stator part end to support the winding.

EFFECT: fastening of stator coils not coated with lacquer inside motor housing.

17 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: invention is related to the stator of electrical machine and the method of its manufacturing. The stator for electrical machine comprises the core having a variety of pole horns and a variety of windings made of electroconductive material at pole horns. At least a part of windings is made of a wire having a pair of free ends, which may be connected electrically to the network power source. The stator comprises two or more electric contacts having a flexible section, which may be moved in direction towards the core and away; the above contacts are connected electrically to the respective contacts of the power source. At least one of electrical contacts is formed by two free ends of the corresponding different wires and has a twisted shaped made by ends twisting along the initial line of the ends passing, at that at the base of each twisted part there is a loop for each electrical contact. The loop forms a dampening element for the respective twisted section.

EFFECT: improved reliability of the electrical machine.

21 cl, 20 dwg

FIELD: electricity.

SUBSTANCE: invention is related to electric engineering and may be used at production of submersible borehole pumps, electric vehicles, in particular hybrid vehicles, and battery vehicles. Winding of double-pole three-phase electric machine is made with number of slots z=18, c pitch of y=1-10, with number of parallel branches a=1 and ratio of number of turns in even delta-connected coils to number of turns in odd wye-connected coils equal to √3. Winding includes six single- and double-layered two-section coils with ratio of turn number in single-layered sections to turn number in double-layered sections equal to 2:1. Coil beginnings of wye and delta phases with the same polarity are shifted per 2 slots (40 electrical degrees). The coils are laid in waggle way and their outputs are placed from outer sides of coils or outputs of only even coils are placed from their inner sides. According to another version outputs of coil beginnings of wye and delta phases are placed in the common slot (shift is equal to 0 electrical degrees, at that at inner sides of the coils there are outputs of odd coils only or outputs of all coils.

EFFECT: implementation of double-pole three-phase energy-efficient and low-noise electric machine with number of slots of z=18, with pitch of y=1-10 and number of parallel branches of a=1.

2 cl, 4 dwg

FIELD: electricity.

SUBSTANCE: invention is related to electromotive machines, and more specifically to devices designed to support to insulate thermally superconducting coils of rotor. The device for support of superconducting coils at separating distance from the core of the machine rotor comprises an elongated circuit designed to serve as radial support for the coil, axial main assembly (84) made with potential fixing of the above circuit in regard to the rotor core at near end of the elongated circuit in regard to the rotor axis and bracket assembly designed to set inner depth for receipt of the superconducting coil section and to support elongated circuit at its remote end in regard to the rotor axis. The elongated material contains material resistant to heat flow. The axial main assembly comprises a modular assembly including the main module placed in cavity of the rotor core.

EFFECT: developing structure ensuring reliable support and heat insulation of the superconducting coil.

10 cl, 16 dwg

FIELD: electrical engineering.

SUBSTANCE: invention is related to electrical engineering, particularly, to generators of electricity. Power generator comprises of the stator with the base, including ring or torus and multiple pins or extending outward from the ring or torus, intended for rigid installation of the base of the stator on the mounting support of the stator, as well as winding conductors wound around said ring or torus. Generator also contains the erection support stator, including base plate, a journal secured to base plate or made integral with it and extending from it, at least on one side, and assembly facilities extending along the periphery of the bed plate, at least on one side. Mounting devices include mounting holes, each of which is intended for reception of one element from the specified multiple pins or the base of stator for rigid installation of the base of the stator on the mounting support of the stator.

EFFECT: technical result is improved design of the generator stator.

17 cl, 7 dwg

Motor coil frame // 2621326

FIELD: engines and pumps.

SUBSTANCE: present invention relates to electrical engineering, namely to electric machines manufacture. The motor coil frame comprises the main part of the coil frame, around which the coil is to be wound, and flanged portions formed integrally with both end portions of the main part of the coil frame, wherein the coil frame uncludes a resin-based molded part formed using a polymer with amide linkages and insulating aramid containing paper made from aramid fibrid and short aramid fibers, at that, the surface of the resin-based molded part and of aramid paper are directly connected to each other.

EFFECT: invention provides improved performance and power output of electrical machines.

7 cl, 4 dwg, 2 tbl

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