Inductor machine

FIELD: electricity.

SUBSTANCE: inductor machine includes stator installed in magnetically soft housing (1) and made in the form of two laminated packs (2) and (3) from magnetically soft material with teeth (4) on their inner surface, working winding (5), the turns of which are located in slots between teeth (4) restricted as to height with backs (6) of those packs, two rotor packs (7) and (8), which are installed inside bores of stator packs (2) and (3), and excitation winding (9) installed between rotor packs (7) and (8). According to the invention, on outer surface of each stator pack (2) and (3) a provision is made for external teeth (10) oriented along the machine axis, the number of which is equal to the number of stator teeth on its inner surface, external teeth (10) are located above sections of backs (6) of each stator pack, sections of backs (6) under external teeth (10) are located between internal teeth of stator packs (2) and (3), and on inner side of housing (1) there are slots for arrangement of external teeth (10) of stator packs (2) and (3).

EFFECT: reduction of losses in housings of inductor machines and improvement of their efficiency, and reduction of time for transient processes.

2 cl, 4 dwg

 

The invention relates to the field of electrical engineering, and more particularly to a device of magneto electric machines, and can be used in General and especially in special machinery oriented manufacturer of electric machines for power supply systems and electric drive Autonomous objects.

Known structural performance induction machines (generators and motors), which are essential features of their device close to the object of the present invention (see, for example, is on page 41 in the book: Sugrobov A.M., Rusakova A.M. Design of electrical machines Autonomous objects. - M.: MPEI Publishing house, 2012). These machines have a stator in the form of two laminated packages, placed in steel smooth on the inner surface of the housing, so that their teeth are placed against each other, the working winding, the coils of which are located in the slots, limited by the height of the backs of packages two packages rotor installed inside the bores of the wound stator, and a fixed excitation winding. The teeth of the packages of the rotor in these machines are as the teeth of the wound stator, against each other, and the working winding is made in the form of single coils (fins), placed on each tooth wound stator.

The lack of induction machines with this device I have are significant losses in the copper business of the windings due to the relatively large total length of the conductors of their windshields parts, the number of which is twice the number of teeth of both packages stator. In addition, in the voltage curve of these machines contains all the harmonics that are present in the curves of change of magnetic conductivity of the length subcatego dividing the stator, which affects the waveform of the voltage generator and the electromagnetic torque ripple when operating these machines in motor mode.

A significant disadvantage of the known induction machines is also alternating magnetic flux in the steel casing on the backside of the wound stator and the presence of the variable component of the magnetic flux in the middle of the area enclosed between these packages. All this leads to the appearance in the array chassis eddy currents, resulting losses, decrease efficiency and increase the time transient.

Closest to the technical nature of the object of the invention is an induction machine, made by a constructive way is in the book: Sugrobov A.M., Rusakova A.M. Design of electrical machines Autonomous objects. - M.: MPEI Publishing house, 2012.

This induction machine has mounted in the housing of the stator in the form of two laminated packages of magnetic material with teeth on its inner surface, the working winding, the coils of which are located in grooves IU the control teeth, limited by the height of the backs of these packages, two sets of rotor installed inside the bores of the wound stator, and the field winding.

The inner surface of the vehicle body and associated external surfaces of packages stator (outer surfaces backs) made smooth.

Packages rotor mounted on the shaft so that their teeth are shifted relative to each other by half subcatego division. The working winding machines made in the form of single coils (fins), covering placed against each other, the teeth of both packages stator. Accommodation winding when shifted by half subcatego dividing the rotor teeth provides the minimum content of higher harmonics in the voltage curve in the generator and the minimum pulsation of the electromagnetic torque in motor mode of operation of the machine, allows to reduce losses in the winding due to the halving of the number of windshields parts and reduce their resistance. The excitation winding in this induction machine is located between packets of the rotor, which allows to reduce significantly the loss (due to the lower average length of a coil) and to facilitate the heat mode of operation of the machine.

A serious drawback of the machine prototype is that at high speeds and consequently a small number of teeth on the rotor magnetic the field in the enclosure is not less significant in comparison with the machines, performed according RIS, the change of the magnetic induction in the axial (along the axis of the machine)and tangential (along the circumference of the body) directions. These changes are especially noticeable in induction machines are made for use in Autonomous power supply systems and electric drive, in which to accommodate electric vehicles, there is a limited by their diameter space. In this case, induction machines have a small height the backrest and the diameter and the change of the magnetic induction is a function of the angle of rotation of the rotor so significant, that are the cause of increased eddy current losses in the body, greatly reducing the efficiency and invalid longer transient.

Especially noticeable is marked deficiencies in induction machines, cases of which are made of soft magnetic materials with a relatively low electrical resistance and, as a consequence, large eddy current losses (these materials include all traditionally used for manufacturing stator induction machines mild steel).

Disadvantages of induction machine prototype and analogues claimed as the invention of the induction machine are one of the main reasons that, with such extremely important for use in electronic systems is rosnaree and drive Autonomous objects and other engineering fields qualities, as simple structure, apparatus, ability to work under the most severe operating conditions and high levels of mass and energy data at high speeds, they are limited in their application.

The technical result of the invention is to reduce losses in case induction machines, increasing their efficiency, reducing time transients and thereby eliminating restrictions for their wider application in Autonomous power supply systems and electric and other fields.

This technical result is achieved by the fact that in the known induction machine, containing mounted in the magnetic housing of the stator in the form of two laminated packages of magnetic material with teeth on their inner surfaces, the working winding, the coils of which are located in the grooves between the teeth, limited by the height of the backs of these packages, two sets of rotor installed inside the bores of the wound stator, and a field winding, characterized in that provided with external teeth which are oriented along the axis of the machine, the number of which equals the number of teeth on the inner surface of the wound stator, and above parts of the backs of each of the stator pack, with lots of backs under the outer teeth are located between the inner and teeth wound stator, as in the case with its internal side is made grooves for placing external teeth wound stator.

In addition, as the magnetic material of the case can be used soft magnetic composite material.

The invention is illustrated by drawings, where figure 1 shows a longitudinal and transverse sections duppattas induction machine with three teeth on the rotor and six teeth on the stator (the machine with the so-called classic the sockets zone), and figure 2 is a top view of the reamer body of this machine. The dotted lines on this drawing shows the projection on the outer surface of the outer teeth wound stator with a trapezoidal shape and a trapezoidal shaped grooves in the housing. Figure 3 shows the shape and arrangement of the trapezoidal grooves (they are plotted as solid lines), and a stepped rectangular grooves (dashed lines) on the inner surface of the housing. Figure 4 shows the placement on the surface of the rectangular grooves.

Induction machine has mounted in the cylindrical housing 1 of the stator in the form of two laminated packages 2 and 3 of magnetic material with the teeth 4 on the inside surface, the working winding 5, sections which cover located against each other, the teeth 4 of the two packages stator 2 and 3 and are located in the grooves between the teeth 4, limited the height of the backrest 6 of these packages 2 and 3 (backless highlighted in figure 1 by dashed lines), two sets of rotor 7 and 8, mounted within the bores of packages 2 and 3 of the stator and shifted relative to each other by half subcatego division and the field winding 9, which is installed between packets of the rotor 7 and 8. On the outer surface of each stator pack 2 and 3 above sections of the backrest 6, located between the internal teeth 4 of these packages, executed oriented along the axis of the machine, the teeth 10. The number of these teeth is equal to the number of stator teeth on the inside surface. For placing external teeth 10 of the wound stator in the housing 1 is made grooves. The height of the outer teeth of the stator 10 is made smaller than the height of the housing 1. The cross-section of these teeth and grooves for placement in the housing 1 has a trapezoidal shape.

The proposed solution involves only a sample of metal from the whole body induction machines under the grooves and filling these grooves laminated along the magnetic field lines external teeth wound stator that does not cause any change in the operation of these machines is neither steady-state nor transient, and only leads to the reduction of eddy currents and losses in the volume selected for the slots of the metal housing and losses in other areas by equalizing them in magnetic induction.

The change in the flux linkage of the working winding induction machine, done is authorized in accordance with figure 1, comes with period T=l/f=60/(Zpn),

where: f - frequency current; Zp- number of teeth of the rotor; n is the rotor speed in min-1.

When specified in figure 1 the position of the rotor magnetic fluxes in the teeth of the stator 4 is arranged coaxially with the rotor teeth, the maximum (equal to fz c max), and in adjacent teeth, coaxially located with the cavities of the rotor is minimal (equal to fz c max). After a half period of the pattern of distribution of magnetic flux in the teeth 4 of the stator is changed to the opposite. The teeth 4, in which the magnetic flux had a maximum value at the troughs, and the magnetic flux is reduced as a consequence to their minimum values, and in the adjacent teeth, which are above the teeth of the rotor, the magnetic flux reaches the maximum value. After a period, which corresponds to the rotation of the rotor on subzone division, the pattern of distribution of magnetic flux in the teeth 4 of the stator adopts its original appearance. Thus, the magnetic fluxes in the teeth of the stator is changed between the maximum and minimum values with a frequency of

f=Zpn/60

The coils of the working winding 5 cover located two against each other prong of both packages 2 and 3 of the stator, so their cross-section is threaded difference flows in these teeth. Because these threads have protivopolojnoe direction, the resulting stream, coupled with the coils of the working winding 5, varies between two extreme values, is equal to fz c max- Fz c minin (fz c max- Fz c min). Periodic change of magnetic flux linked with the coils of the working winding 5, causes it periodically varying at the same frequency EMF. With the same frequency is changed and the tangential component of the magnetic flux in the outer prongs 10 packets stator fz c drug.

The height of the housing 1 over the exterior teeth of the packages 10 of the stator when the implementation of the proposed technical solution is selected from maintaining the necessary mechanical strength of the design of the machine.

The greatest effect from the implementation of this technical solution with trapezoidal shaped teeth 10 on the outer surface of the stator is achieved by performing the slots in the housing through the height of the outer grooves of packets equal to the thickness of the body). Through the laminated external teeth 10 of the wound stator in the tangential direction (along the circumference of the wheel teeth with a maximum flow to the tooth with minimal flow) passes the magnetic flux, equal to

Fz c drug=0.25(fz c max- Fz c min)

The cross-sectional shape of teeth 10 on the packages 2 and 3 of the stator and the slots for them in the housing can be performed not only keystone (it suitable for all kinds of what is optimal from the point of view of the magnitude of the magnetomotive force (MMF) of the excitation winding, required to conduct magnetic flux through the body), and rectangular (figure 4), which is preferable from the standpoint of simplicity and the complexity of the technological process of manufacture and Assembly, wound stator. Compromise is a step-rectangular shape of the outer teeth of the wound stator and the slots in the housing, combines the advantages of trapezoidal and rectangular shapes (outlines step-rectangular grooves in the housing shown in figure 3 by dashed lines).

To achieve maximum effect from the implementation of the invention for the manufacture of wound stator is desirable to use high-quality magnetic materials, such as are widely used in aviation electrical engineering, iron-cobalt alloys CH, CF, and other materials with high values of magnetic permeability and saturation induction and low specific losses. The application allows you to achieve almost uniform magnetic field in the areas of housing, which are located on the internal teeth of the stator, and to reduce the ripple of the axial and tangential components of the magnetic induction in the medium located between the wound stator field housing, which eliminates the appearance of this area of the case eddy currents and training is a result of their losses and to avoid unacceptable increases in time of the transient.

An optimal solution to the problem of reducing losses in the housing can be achieved if in addition to implementing its proposed technical solutions and appropriate selection of the material for making bags of the stator to produce a body of modern soft magnetic composite materials type Somaloy with unlike traditionally used for its manufacture of low-carbon steels (steels 10, 20 and others) large electrical resistance and consequently significantly fewer losses.

The use of the invention enables the reduction of losses in the case induction machines, increasing their efficiency, reducing the time transients and thereby eliminating restrictions for their wider application in Autonomous power supply systems and electric and other fields.

1. Induction machine, containing mounted in the magnetic housing of the stator in the form of two laminated packages of magnetic material with teeth on their inner surfaces, the working winding, the coils of which are located in the grooves between the teeth, limited by the height of the backs of these packages, two sets of rotor installed inside the bores of the wound stator, and a field winding, characterized in that provided with external teeth which are oriented along the axis of the machine, the number of which equals the number who have teeth on the inner surface of the wound stator, and above parts of the backs of each of the stator pack, with lots of backs under the outer teeth are located between the internal teeth of the wound stator and the housing with its internal side is made grooves for placing external teeth wound stator.

2. Induction machine according to claim 1, characterized in that as the soft magnetic material used soft magnetic composite material.



 

Same patents:

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FIELD: electricity.

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2 dwg

FIELD: electricity.

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FIELD: electricity.

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1 dwg

FIELD: electricity.

SUBSTANCE: inductor generator includes static stator (1) that consists of central cylindrical core (2) and two side rods (3) located around and symmetrically to the core (2), the core and the rods have common foundation (4), the rods front parts are done in the form of sectors with arc length equal to π/2, near the stator there is a salient-pole rotor (5) that has the central part (6) contacting the stator core (2) with a gap and two poles (7) performed in a form of sectors with arc length equal to π/2, i.e. equal to the sectors arc length of stator rods. Note that the section area of rotor pole (7) sector is equal to section area of stator (1) rod (3) sector, rotor poles (7) are arranged parallel to stator rods, there is an excitation winding (8) in a form of a coil at the central cylindrical core (2). There is power winding (9) at the side rods (3) covering the corresponding rods and performed in a form of coils. Rotor shaft (10) is connected to the mechanism that activates rotor rotation.

EFFECT: creation of inductor generator that has simple structure and able to generate electric energy in a form of one-phase or three-phase current with high coefficient of efficiency.

9 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: reactive switched electrical machine with rotation symmetry consists of stator 1 with even number of poles Zs and coils 2 located on them with polyphase winding and even number of phases, windingless rotor 3 with odd number of poles Zr. According to invention number of stator poles is calculated as per the formula: Zs = 6·n where n=1, 2, 3…, number of rotor poles Zr is calculated as per the formula Zr = Zs ± 3. At that adjoining phase windings of stator have alternate polarity; all phase coils within limits of one phase are connected in opposition, magnetic field of active phase is closed through other phases and it allows development of polyphase electrical machine with even number of phases which magnetic structure has rotation symmetry with angle of rotation equal to 120°.

EFFECT: reduction of converter costs.

FIELD: electricity.

SUBSTANCE: invention refers to the design of non-contact synchronous electric machines with axial excitation and can be used in wide range of frequencies of machine shaft rotation (from units of revolutions per minute to several tens of thousand revolutions per minute) in automation systems, independent electric equipment systems, in military, space engineering, on aviation and automobile transport, as traction controlled and non-controlled electric actuators, wind-driven generators, multiphase synchronous motors and high-frequency synchronous electric AC generators, multiphase generators of frequency converters (including three-phase systems), as well as at rectification of output variable voltage and current of generators by means of semiconductor rectifying devices and with possibility of using smoothing filters to reduce fluctuations of output parameters - as DC (rectified current) power supply sources. Stator of non-contact electric machine with axial excitation includes odd and even armature cores with salient poles of armature, which represent laminated packs from insulated electrotechnical steel plates with high magnetic permeability and fixed in soft magnetic housing; the number of armature cores - not less than two, on salient poles of armature there concentrated is coil multi-phase armature winding, each coil of which envelopes in axial direction one of salient poles of armature of each armature core; between armature cores there located are ring-shaped coils of inductor excitation winding, the axes of which coincide in axial direction with machine shaft axis, connected to each other in magnetic opposite ratio, of ring-shaped coils of inductor excitation winding is one less than the number of armature cores. Rotor without winding includes non-magnetic shaft with soft magnetic bushing on which there coaxially located are odd and even rotor magnetic conductors with pole projections, which are represented with laminated packs and consist of insulated electrotechnical steel plates with high magnetic permeability; the number of rotor magnetic conductors is equal to the number of armature cores; odd and even rotor magnetic conductors are located relative to the appropriate odd and even armature cores and have the same active length in axial direction; even rotor magnetic conductors are offset relative to odd magnetic conductors in tangential direction through the half of pole pitch of rotor magnetic conductor. At that, certain ratios are fulfilled between the number of salient armature poles, number of phases of multi-phase coil winding of armature, number of salient poles of armature in phase and number of pole projections of each magnetic conductor of the rotor.

EFFECT: obtaining reliable design appropriate to the material of multi-phase non-contact electric machine with axial excitation with high energy properties and operating characteristics at wide range of shaft rotation frequencies and with various ratio of active length and bore diameter of machine stator.

18 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: in the proposed synchronous reluctance machine, which comprises a multiphase power winding on a stator, which is evenly distributed along an inner bore of the stator and designed for connection to a valve converter, and also a multiphase excitation winding with a full pitch, designed for connection to controlled exciters, according to the invention, at the edges of each rotor pole there is a corrugation arranged in the form of grooves with the pitch h = 8 - 10 mm, and their bases are located in planes parallel to axis of rotor rotation, at the same time the width of each groove is a = 2 - 4 mm, the depth b = 8- 10 mm.

EFFECT: reduced heating of a synchronous reluctance machine rotor due to lower magnetic losses caused by pulsations of excitation magnetomotive force.

3 dwg, 2 ex

FIELD: electricity.

SUBSTANCE: invention refers to low-speed high-torque electric motors, electric drives and generators, to the design of non-contact electric machines with electromagnetic reduction and can be used in automation systems as motorised wheels, motorised drums, starter-generators, electric steering wheel boosters, direct drives in domestic equipment, electric drives of high and average power of ships, trolleybuses, trams, concrete mixers, lifting mechanisms, belt conveyors, liquid transfer pumps, mechanisms with high torques on the shaft and low frequencies of its rotation, as well as direct drives without using any mechanical reduction gears, as well as wind-driven generators, hydraulic generators, high-frequency electric generators, synchronous generators of frequency converters and as controlled stepped motors. Non-contact electric reduction machine with salient-pole armature includes stator with housing made from soft magnetic material with odd and even packs of stator, which are laminated and consist of insulated electrotechnical steel plates with high magnetic permeability, and the number of which is not less than two; non-magnetic shaft with bushing from soft magnetic steel with high magnetic permeability with odd and even rotor packs with high permeability, which are laminated and consist of insulated electrotechnical steel plates, and the number of which is equal to the number of stator packs; active length of extreme stator and rotor packs in axial direction is equal if the number of stator packs is more than two; active length of stator and rotor packs in axial direction, which are located between extreme packs, is more by two times than active length of extreme packs; stator packs contain salient poles uniformly distributed along cylindrical surface, on inner surface of which there are elementary teeth, the number of salient poles on each stator pack is equal, the number of elementary teeth on each salient pole of stator pack is equal, stator packs in tangential direction are located so that axes of their salient poles located opposite each other in axial direction coincide; rotor packs contain the teeth uniformly distributed along cylindrical surface and the number of which on each rotor pack is equal; even rotor packs are offset relative to odd rotor packs in tangential direction through the half of tooth division of rotor pack, on salient poles of stator packs there is coil m-phase winding of armature, each coil of which in axial direction envelopes the appropriate salient poles of even and odd stator packs of one pole of each pack; between stator packs there located is excitation winding of inductor, which is made in the form of ring-shaped coils with longitudinal axis coinciding with longitudinal axis of machine, number of ring-shaped coils of excitation winding of inductor is one less than the number of stator packs. At that, there shall be certain relations between the number of salient poles of armature, number of elementary teeth on salient pole of armature, number of salient poles of armature in phase, total number of armature teeth, number of teeth on each pack of rotor and number of phases of m-phase armature winding.

EFFECT: manufacture of high-technology constructions of non-contact electric reduction machines with salient-pole armatures by applying electromagnetic reduction in wide range at providing high energy parametres and operating characteristics with possibility of smooth and deep control by means of output parametres.

9 cl, 5 dwg, 1 tbl

FIELD: electricity.

SUBSTANCE: invention relates to electrical machines, namely to synchronous generators of inductor type used, for example, in motor and tractor equipment. Invention is intended to enable use of classical stator with ferromagnetic rotor in induction machine version. According to invention, to achieve this, in electric power generator featuring axial excitation source, operating coil, stator, geared disc rotor with shaft, the stator is made in the form of bowl, excitation source is mounted in the bowl centre, and rotor bearing is mounted on the top end of the excitation source.

EFFECT: practical rotor structure, possibility to use bowl-shaped stator.

3 dwg

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