Electrical machine rotor

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 electrical engineering, in particular to the large rotors of electrical machines, such as turbine generators.

Known electric machine rotor winding, mounted on the front of a solid metal shroud rings, worn on one side to the end portion of rotor core hot landing, and the other the back, through the elastic centering ring with tangential slots on the end part of the rotor shaft. [1]. However, this invention only reduces the alternating voltage in the landing zone of the retaining rings on the rotor core arising from the deflection of the rotor shaft during operation of the electric machine, due to the high flexibility of the elastic elements in the radial direction. The closest analogue is the prototype of the invention is another well-known design of the rotor of the electric machine [2] dvuhmesyachnik execution of the banding site, in which the retaining rings are fixed from the back side through the centering ring, the cross section of the Z-shaped form, which act as elastic elements. However, this form of elastic elements, providing good flexibility of the binding site in the axial direction, it does not provide sufficient flexibility in the radial direction.

Technical re is the query result, to achieve directed this invention is to increase the reliability of the rotor of the electric machine due to the additional reduction of alternating stresses in the landing zone of the retaining rings on the rotor core, as a result of the use of the positive qualities of two types of elastic elements: centering rings Z-shaped elastic elements with tangential slits.

Figure 1 shows the rotor of the electric machine containing solid core (1) with the coil winding (2), fixed to the end parts (3) in the radial direction through the massive metal retaining rings (4), put one side on the face part of the core of a hot landing, and the other, the rear part through the centering ring (5) with elastic elements (6), at the end of the shaft (7) of the rotor, which is made air ducts (8). Legend: υmax- maximum static deflection of the rotor shaft in the Central part of the core.

Figure 2 shows the cross-section of the centering ring with the combined elastic element in the form of arcuate leaf springs formed by two rows of through intermittent slits (b)located tangentially evenly spaced around the circumference, in a checkerboard pattern and the centering ring, the cross section of which has a Z-shape (a).

Banding site, which is the most loaded in mechanical relation to the hub of the rotor of the electric machine, holds the end windings are mounted on a rotating core in the radial direction against the centrifugal force due to the shroud ring, and in the axial direction from forces arising from thermal expansion of the winding, with the centering ring.

In dvuhpushechnom performance banding site, fixed on both sides of the retaining rings, the most dangerous alternating stresses that occur during operation of the electric machine, from a deflection of the rotor shaft in the landing zone of the retaining rings on the core, the value of which reaches maximum values in the middle part of the rotor (υmax).

To eliminate or at least minimize these alternating voltage in the landing zone of the retaining rings on the rotor core is the purpose of the invention.

This is achieved by the fact that the centering ring, the cross section of which has a Z-shape, in the area of one surface of the pair of centering rings with the shaft of the rotor or of the retaining ring are additional elastic elements in the form of two rows of slits placed in the tangential direction evenly around the circumference of the centering ring and u is defined relative to each other in a checkerboard pattern. In the centering ring can be limited to only one series of tangential slits, so that the second series of staggered slots was performed on the mating surface of the rotor shaft. In this case, as the second series of staggered slots can be used, for example, the ventilation channels in the end portion of the rotor shaft passing under the centering ring.

Sources of information

1. The copyright certificate on the invention of the USSR, the Rotor of the electric machine No. 792491, 01.09.1980,

2. Titov, V.V., and other turbine generators. Calculation and design. L.: Energy, 1959, p.18, 1-10 (b). 895 S.

The rotor of the electric machine, containing a massive core with bobbin winding fixed to the end parts in the radial direction through the massive metal retaining rings, worn on one side face part of the core, and the other party on the cylindrical surface of the centering ring, the cross section of which has a Z-shape, with the inner surface of the centering rings are connected to end parts of the rotor shaft, characterized in that in the area of one of these surfaces mate with the shaft of the rotor or of the retaining ring of each of the centering rings evenly spaced around the circumference of the latter Tang is cialdom direction performed two series of slots, which in the above rows are located relative to each other in a checkerboard pattern.



 

Same patents:

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

SUBSTANCE: in order to minimize alternate stress due to mass of banding assembly and due to rotor flexure when fitting banding rings onto rotor core, at least one annular slit formed by side surfaces and bottom disposed concentrically to outer cylindrical surface of banding rings gradually transferred to side surfaces is made on outer cylindrical surface and on conical surfaces of banding rings close to point of their fitting onto rotor core.

EFFECT: enhanced reliability of nonsalient pole synchronous machine rotor.

4 cl, 2 dwg

FIELD: electric engineering and electro-mechanical industry, in particular - rotors of large electric machines such as turbo generators.

SUBSTANCE: in accordance to invention, elastic elements in localizing rings are made with rigidity Z, providing their combined effect in radial direction onto tread rings and end parts of rotor shaft, equivalent to effect of mass of tread rings and under-tread content (Pequiv.) onto localizing rings during contraction (extension) of elastic elements for value, equal to difference between static flexures ν1st. and ν2st. of rotor shaft at sections where planting zones of tread ring are located, determined from expression: (Δνel.elem.)=( ν2st. - ν1st.), while values of ν1st. and ν2st. are determined on condition of effect of core mass onto middle, massive section of rotor, and on condition of effect of mass of tread rings and under-tread content onto end sections of core and end sections of rotor in the plane of localizing (stopping) rings, while rigidity of elastic elements in localizing rings required to provide for constant coaxial position of planting surface of tread rings and core is determined from expression where n and φ are, respectively, number of elastic elements and their effect direction angle relatively to radial rotor axis. Also possible are several variants of creation of equally effective structures of elastic elements, built with consideration of basic statement about selection of rigidity of elastic elements, such as ones built into localizing or stopping rings of tread units of electric machine rotors, making it possible to use positive sides of structures of one-position and two-position tread units.

EFFECT: increased reliability of rotor of implicit-pole electric machine due to maximal decrease up to full removal of sign-alternating voltages in zone of planting of tread rings onto rotor core, caused by mass of tread unit and rotor flexing.

6 cl, 5 dwg

FIELD: electromechanical engineering; rotor manufacture for nonsalient-pole electrical machines.

SUBSTANCE: proposed method for assembling rotor of nonsalient-pole electrical machine includes fixation of teeth on rotor barrel and installation of multiturn coils, these procedures being alternating as follows: first coil of greater size is installed on rotor barrel, then teeth abutting against this coil are fixed, after that smaller coils are installed and secured in the same manner as first coil.

EFFECT: reduced time taken for rotor manufacture, enhanced reliability of rotor mechanical design.

3 cl, 2 dwg

The invention relates to the field of electrical engineering and for the design of rotor synchronous neravnopolochny electrical machines, mainly turbine generators, in particular the design of the attachment of the retaining ring rotor

The invention relates to electrical engineering, namely, turbine generators with a gas cooling

The invention relates to the field of electrical engineering and relates to the specifics of the design execution anchors high-speed motors with forced-air cooling system air

The invention relates to a combined three-phase-multi-phase winding of the rotor of a single-machine frequency converters when the number of pairs of poles p2for three-phase generator and p1for multi-phase squirrel-cage motor parts

The invention relates to a device for securing the end parts of the winding anchors large electric machines and can be used in the electrical industry

The invention relates to electrical engineering, mainly can be used in the construction of turbo-generators

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

Up!