The device for fastening the winding in the slots of the core of an electric machine
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. An object of the invention is to improve the reliability of mounting of the winding in the slots of the core of the electric machine by changing the structure of the device for fastening the winding. The solution of this problem is due to the fact that the device for fastening the winding in the slots of the core of the electric machine is made in the form of an elastic wavy strip, and the protrusions and depressions wavy surface angled relative to the longitudinal axis of the strip. The angle is selected depending on the width of the strip so that the projection enters the plane of one of the tabs on the opposite edge of the strip found on the incident plane of the adjacent ledge. 3 Il.
The invention relates to the field of electrical engineering, in particular to the construction of large electric machines, mainly turbogenerators and hydrogenerators, and more particularly to the fastening elements of the second wavy strip, placed between the coil and wedge into the longitudinal groove of the wedge. In the wavy wavy strip is perpendicular to the longitudinal axis of the strip. Ongoing during operation of the electric machine load in the radial direction leads to reduced elasticity of the strip and having a longitudinal groove in the wedge reduces its cross-section, which reduces its rigidity. The result is a loosening of the winding in the slot and generally reduces the reliability of the device.
Closest to the claimed invention is a device for fastening the terminals of the winding in the slot of the core of the electric machine , made in the form of an elastic wavy strip, made of fiberglass and is placed between the terminals and the iron core.
Improving the reliability of the device mounting the winding in this invention is achieved by applying to one side of a corrugated strip of nylon fabric, resistant to abrasion. This solution complicates the manufacturing technology of the strip. At the same time there is a risk of delamination layer nylon fabric during operation of the device, which may lead to an emergency situation and SN-resistant and which provides high mechanical strength, during operation of the electric machine is loss of elasticity of the strip due to the effect of loads acting on the terminals of the winding in the tangential direction, which reduces the reliability of the device.
The present invention is to improve the reliability of mounting of the winding in the slots of the core of the electric machine by changing the structure of the device for fastening the winding.
The solution of this problem is due to the fact that the device for fastening the winding in the slots of the core of the electric machine is made in the form of an elastic wavy strip, and the protrusions and depressions wavy surface angled relative to the longitudinal axis of the strip. The angle is selected depending on the width of the strip so that the projection enters the plane of one of the tabs on the opposite edge of the strip found on the incident plane of the adjacent ledge.
The location of the projections and depressions undulating surface at a specified angle to the longitudinal axis of the strip allows you to increase the length of the wave and to increase the rigidity of the strip along its edges, which increases the mechanical strength and elasticity of the strip.
Improving mechanical prochnosti core, because it eliminates the loosening of:
- in the tangential direction when the gasket is installed between the terminals of the winding and the groove wall of the core;
in the radial direction, if the gasket is installed between the coil and the slot wedge.
New in the invention is the implementation of the protrusions and depressions wavy strip at an angle relative to the longitudinal axis of the strip, in which the projection enters the plane of one of the tabs on the opposite edge of the strip is on the incident plane of the adjacent ledge.
This set of new characteristics of the proposed device is not detected from the prior art, which allows to make a conclusion on compliance of the claimed invention, the condition of patentability "inventive step".
The invention is illustrated by drawings, where Fig.1 shows the elastic strip wave form (top view), and Fig.2 is a view of the elastic strip in a perspective view; Fig.3 is a cross-section of the groove of the electric machine with the laid winding and installed wavy strips.
Elastic strip 1 has a wavy surface, in which the adjacent protrusions 2 and 3 and the trench 4 angledfrom the edge of the strip is on the incident plane of the adjacent ledge 3.
Elastic wave-like strip 1 as a device for fastening the winding is placed between the wall of the groove of the core 6 and the terminals of the winding 7 and 8, respectively, in the direction of rotation of the rotor and is designed to provide lateral tangential thrust.
Elastic wave-like strip 1 is also located between the slot wedge 9 and the winding rod 7 and is intended to provide radial expansion.
Implementation of the proposed solutions to technical difficulties does not represent that allows to make a conclusion on compliance of the claimed invention, the condition of patentability "industrial applicability".
Sources of information
1. Patent Of Great Britain No. 1340756.
2. USSR author's certificate No. 495743.
The device for fastening the winding in the slots of the core of an electric machine, made in the form of an elastic wavy strip with projections and depressions, wherein the protrusions and depressions are made at an angle relative to the longitudinal axis of the strip, in which the projection enters the plane of one of the tabs on the opposite edge of the strip is on the incident plane of the adjacent ledge.
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
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
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
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
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
FIELD: electrical engineering; electrical machine stators using wedges and gaskets for fixing windings in open slots.
SUBSTANCE: proposed electrical machine stator has magnetic core with slots, winding secured in slots by means of nonmagnetic wedges and insulating gaskets disposed under wedges, as well as additional gaskets provided with slits along axial line of gasket; additional gaskets are disposed in depressions made in main wedges facing the winding. Stator design incorporates provision for optimizing machine parameters and reducing slot harmonic components of magnetic field and inductive reactance of its winding due to reducing inductance of slot dissipation causing reduction in magnetizing current.
EFFECT: enhanced efficiency and overload capacity, reduced vibration activity of electrical machine.
1 cl, 2 dwg
FIELD: electric engineering, possible use in dynamo-electric machines.
SUBSTANCE: dynamo-electric machine has winding rods inserted into grooves. Each groove is closed by closing wedges. Between closing wedges and winding rods positioned below them, undulate plate springs are positioned, mechanically mated in advance by means of oppositely mounted wedges, positioned between closing wedges and winding rods below them. Simple and fast wedging is possible because opposite wedges are positioned between closing wedges and undulate plate springs, and due to availability of regulating elements which are in fixed position it is possible to change the distance between closing wedges and opposite wedges using aforementioned elements.
EFFECT: reduced time of manufacture.
14 cl, 3 dwg