JP2016101018A - Stator of dynamo-electric machine, and dynamo-electric machine including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of dynamo-electric machine reconciling enhancement of workability/insulation performance and compaction, and to provide a dynamo-electric machine including the same.SOLUTION: In a stator 8 of dynamo-electric machine including a plurality of stator windings 7 arranged annularly, four conductors 3 performing three-phase Y-connection of the coil terminals 10 of a stator winding, as U-phase, V-phase, W-phase, and their neutral point, and a connection plate 2 for holding the conductors, the coil terminal is inserted into a hole 20 provided in the conductor and connected. The conductors are formed into substantially C-shape having an opening, and disposed concentrically on the connection plate that is disposed on the stator windings. One end of the conductor disposed on the inside is led out to the outer periphery, by passing through the opening of the conductor disposed on the outside.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stator for a rotating electrical machine having a structure in which coil ends of a stator winding are connected via a conductor, and a rotating electrical machine including the stator.

  In the form of the stator winding of the rotating electrical machine, concentrated winding that forms a coil by concentrating and winding the wire for each magnetic pole tooth, winding the strand across a plurality of slots, and different phases at the coil end, Or there is a distributed winding in which coils of the same phase overlap each other. Concentrated winding can reduce the coil end compared to distributed winding, and is effective in reducing the size and efficiency of rotating electrical machines. On the other hand, the distributed winding can bring the rotating magnetic field distribution on the inner circumference of the stator closer to a sine wave, and can reduce the noise with higher output than the concentrated winding.

  Patent Document 1 discloses a technique for configuring a connection portion by joining a concentrated-winding coil terminal to a bus bar formed by bending a band-shaped member.

JP 2008-31277 A

  The technique of Patent Document 1 has a problem in productivity because the bus bar has a low material yield because the bus bar is formed by bending the strip-shaped member in multiple directions. In addition, since the bus bars intersect three-dimensionally, complicated work is required to dispose an insulator between the intersecting bus bars. If an insulation distance is provided in order to insulate without providing an insulator, the connection portion becomes large. Furthermore, it is necessary to assemble the connection part while avoiding interference between bus bars, and there is a problem in workability.

  Accordingly, an object of the present invention is to provide a stator for a rotating electrical machine that achieves both improvement in workability / insulation performance and downsizing, and a rotating electrical machine including the stator.

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

  The present application includes a plurality of means for solving the above-mentioned problems. For example, a plurality of stator windings arranged in an annular shape and a coil terminal of the stator winding are connected to a U phase, a V A stator of a rotating electrical machine comprising a phase, a W phase, and four conductors for three-phase Y connection as neutral points thereof, and a connection plate for holding the conductor, wherein the coil terminal is provided on the conductor The conductor is formed in a substantially C shape having an opening, and is concentrically arranged and fixed on the connection plate disposed on the stator winding. One end of the conductor disposed on the inner side is led out to the outer periphery through an opening of the conductor disposed on the outer side.

  ADVANTAGE OF THE INVENTION According to this invention, the stator of the rotary electric machine which improved the workability | operativity and insulation performance, and reduced size, and the rotary electric machine provided with the same can be provided.

1 is a perspective view of a rotating electrical machine showing Embodiment 1. FIG. The perspective view of a concentrated winding coil. The perspective partial sectional view of the connection part of the coil terminal of Example 1 and a conductor. The exploded view which shows the structure of a coil end connection part. FIG. 6 is a perspective partial cross-sectional view of a rotating electrical machine showing a second embodiment. FIG. 6 is a partial perspective view of a rotating electric machine showing a third embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, a rotating electrical machine used for an electric vehicle is used as an example. This rotating electric machine has a function of a motor that drives wheels of a vehicle and a function of a generator that generates electric power using regeneration, and these functions are used by switching according to the traveling state of the vehicle. .

  FIG. 1 is a perspective view of a stator of a rotating electrical machine showing Embodiment 1 of the present invention.

  The rotating electrical machine includes a stator 100 and a rotor (not shown) coaxially, and is fixed to a transmission case or the like on the vehicle side. The rotor is rotatably held on the inner peripheral side of the stator, and transmits a driving force generated between the stator 100 and the rotor to the outside. The stator 100 is formed by disposing a concentrated winding stator 8 in a cylindrical housing 9, and a vehicle-side transmission case using a fastening member such as a bolt in a through hole 91 provided in a convex portion on the outer periphery of the housing 9. It is fixed to.

  The concentrated winding stator 8 is configured by assembling a plurality of concentrated winding coils 7 in an annular shape. FIG. 2 is a perspective view of the concentrated winding coil 7. The concentrated winding coil 7 includes a core 5 in which electromagnetic steel sheets are laminated, a bobbin 6 disposed so as to cover the outer periphery of the side surface of the core 5, and a stator winding in which the insulating coating wire 1 is wound around the recess of the bobbin 6. With. The core 5 is formed by laminating electromagnetic steel plates in the axial direction of the rotating electrical machine 100 (FIG. 1), and reduces eddy current loss caused by changes in magnetic flux. The bobbin 6 is an insulator penetrating in a quadrangular shape so as to cover four surfaces orthogonal to the radial direction of the stator. Each side of the quadrangular bobbin 6 is formed in a concave shape. The yoke portion 51 of the core 5 is for connecting the cores 5 to form a cylindrical concentrated winding stator 8. The winding start coil terminal 101 and the winding end coil terminal 102 are extended in the axial direction of the rotating electrical machine.

  FIG. 3 is a perspective partial sectional view of a connection portion between the coil terminal and the conductor. An annular connection plate 2 is arranged on the stator end surface in the axial direction of the rotating electrical machine to form a coil end. A plurality of through holes 20 are opened in the connection plate 2, and the coil terminal 10 is inserted into each through hole 20. In the present embodiment, the number of concentrated winding coils 7 is 24, and U-phase, V-phase, and W-phase coils are repeatedly arranged 8 times. Therefore, the total number of coil terminals 10 is 48. The 24 winding start coil terminals 101 are arranged on the inner peripheral side of the connection plate 2, and the 24 winding start coil terminals 101 are connected to each other to form a neutral point. Twenty-four winding end coil terminals 102 are divided into three phases (U-phase, V-phase, W-phase) by 8 and are arranged at positions shifted in the radial direction on the outer peripheral side of the connection plate 2. The winding end coil terminals 102 having the same phase are drawn out at the same radius. Eight U-phase coils, eight V-phase coils, and eight W-phase coils are connected to form a three-phase concentrated winding stator 8.

  The coil terminals 101 and 102 of the insulating coating conductor 1 are inserted into both the connection plate 2 and any of the four conductors 3 (U phase, V phase, W phase, neutral point). A connection hole is opened in the conductor 3 disposed on the surface of the connection board 2, the coil terminal 10 is inserted into the connection hole, and an end of the coil terminal 10 protrudes from the upper surface of the conductor 3. Thereafter, the end of the coil terminal 10 and the periphery of the connection hole are melted by TIG welding to join the coil terminal 10 and the conductor 3 together.

  The connection board 2 is provided with walls 21 for positioning the respective conductors and ensuring interphase insulation between the conductors 3. The wall 21 has the same height as the conductor 3 and is continuously formed along the inner circumference, outer circumference, and lead-out portion of the conductor 3. Further, the layered resin 4 is formed by dropping a liquid insulating resin onto the connection plate 2 and the conductor 3 and then curing the resin. The conductor 3 is surrounded by the connection plate 2 and the wall 21 at the lower part and the side face, and the upper part is fixed and insulated by sealing the upper part with the layered resin 4. With this structure, the interphase insulation between the insulating coating conductor 1 and the conductor 3 is maintained with the connection plate 2 and the layered resin 4 interposed therebetween.

  FIG. 4 is an exploded view showing the structure of the coil end connection portion. Here, the four conductors 3 are substantially C-shaped with different diameters and are arranged concentrically on the same plane so that they can be arranged at the axial end portions (coil end portions) of the stator. A conductor 3 serving as a neutral point is arranged on the innermost peripheral side. On the outer periphery of the neutral point, conductors 3 serving as a U phase, a V phase, and a W phase are arranged in order from the outside. One end of the conductor 3 (V-phase, W-phase) arranged on the inner peripheral side is led out through the C-shaped opening of the conductor 3 (U-phase, V-phase) arranged on the outer peripheral side. A portion 31 is formed. The lead-out part 31 is connected to an inverter that supplies electric power to the rotating electrical machine via a terminal plate 33 joined by welding or brazing. The connecting plate 2 has a convex portion 22 formed on the outer peripheral side at a portion corresponding to the lead-out portion 31 of the conductor 3. The joint portion 32 between the lead-out portion 31 and the terminal plate 33 is disposed on the convex portion 22. The layered resin 4 is also formed on the convex portion 22 of the wiring board 2, and the joint between the conductor 3 and the terminal plate 33 is also sealed with the layered resin 4.

  As described above, according to the present embodiment, the coil terminal 10 is inserted into both the through hole 20 and the connection hole, and the coil terminal 10 and the conductor 3 are joined by welding or brazing. 3 can be aligned with a minimum of deformation, so that the coil end dimension of the concentrated winding stator 8 is reduced.

  By unifying the radius of each drawing position of the winding end coil terminal 102 for each of the U phase, the V phase, the W phase, and the neutral point, and by arranging the conductors 3 in a substantially C shape having different diameters, they are arranged concentrically. The conductor 3 can be arranged by effectively using the radial width of the concentrated winding stator 8. Furthermore, one end of the conductor 3 disposed on the inner peripheral side is led out from the C-shaped opening of the conductor 3 disposed on the outer peripheral side, so that the plurality of conductors 3 can be placed on the same plane. The coil end can be shortened because the conductor 3 is not required to be deformed in the axial direction of the rotating electrical machine. Furthermore, since the molding direction of the conductor 3 is limited, the molding process can be simplified and the manufacturing cost can be reduced.

  The connection plate 2 is provided with a wall 21 having the same height as the conductor 3 and sealed with a layered resin 4 formed by dripping and curing an insulating liquid resin, thereby fixing the conductor 3 and Insulation can be increased. Since the wall 21 is continuously formed along the inner periphery, the outer periphery, and the lead-out portion 31 of the conductor 3, the fixing position accuracy of the conductor 3 is improved. Furthermore, the insulation distance is increased by the wall 21, and an electrical short circuit between the adjacent conductors 3 can be prevented. Moreover, since there is no deformation | transformation of the axial direction of the rotary electric machine of the conductor 3, the conductor 3 and the wall 21 become equivalent height over the whole region. For this reason, when the liquid resin is dropped, the resin can remain at the dropping position, so that the dropping operation is facilitated, and the thickness of the layered resin 4 can be leveled, so that the reliability of insulation is ensured. .

  The conductor 3 and the terminal plate 33 are joined by welding or brazing, and the strength of the conductor 3 is reduced due to the thermal effect during joining. By sealing the joint portion 32 with the connection plate 2 and the layered resin 4, stress due to external force such as vibration can be suppressed and reliability can be improved.

  As a result, the motor characteristics can be reduced as they are, and the reliability can be improved.

  In the first embodiment, the conductor 30 has a circular cross-sectional shape, but by making the cross-sectional shape a square, the unevenness of the surface formed by the wall 21 and the conductor 30 is reduced. FIG. 5 is a perspective partial cross-sectional view of the stator of the rotating electric machine according to the second embodiment.

  By forming the conductor 30 in a square shape, the volume of the concave portion on the surface formed by the wall 21 and the conductor 30 is reduced, the liquid resin flowing into the concave portion is reduced, and the amount of resin for molding the layered resin 4 can be reduced. .

  Furthermore, by making the cross-sectional shape of the conductor 30 square, the conductor 30 can be made lower than a circle when the cross-sectional area is the same, so that the axial length of the stator can be reduced.

  In Example 1 and Example 2, the liquid resin was dropped and cured to form the layered resin, but by fixing the resin cover 41 on the connection board 2, the liquid resin curing process was abolished. , Can simplify the work. FIG. 6 is a perspective partial cross-sectional view of the stator of the rotating electric machine according to the third embodiment.

  The outer periphery and inner periphery of the resin cover 41 are provided with convex portions that fit with the outer peripheral portion and the lower surface of the inner peripheral portion of the connection plate 2, and are fitted together with minute elastic deformation so that the connection plate 2 and the resin cover 41 are fitted together. Is fixed. The resin cover 41 is in contact with the conductor 3 with elastic deformation, and the conductor 3 is fixed by elastic force. Since the conductors 3 are arranged on the same plane, the resin cover 41 has a flat shape, and the possibility of foreign matter mixing in the gap with the connection board 2 can be minimized.

  In this embodiment, the cross-sectional area of the concentrated winding coil 7 is circular, but it may be square. Since the concentrated winding coil 7 can be wound at a high density by making it square, the efficiency of the rotating electrical machine is improved.

  As described above, according to the present invention, the stator winding is joined so as to penetrate a plurality of conductors that connect the stator winding in a multiphase connection, and the lead-out portion that connects to the outside is connected to the C-shaped opening. Therefore, each conductor does not need to be deformed in the axial direction of the rotating electrical machine, and the intersection between the conductors can be eliminated. By eliminating the crossing, insulation between conductors becomes easy and workability and insulation performance can be improved. Furthermore, the stator and the rotating electrical machine can be reduced in size by minimizing the radial width and the axial width of the stator.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 Insulation film conductor 2 Connection board 3 Conductor 4 Layered resin 5 Core 6 Bobbin 7 Concentrated winding coil (stator winding)
DESCRIPTION OF SYMBOLS 8 Concentrated winding stator 9 Housing 10 Coil end 20 Through-hole 21 Wall 22 Convex part 30 Rectangular conductor 31 Conductor lead-out part 32 Conductor joint part 33 Terminal board 41 Resin cover 51 Joint part 91 Through-hole 100 Rotating electrical machine 101 Start of winding Coil terminal 102 End coil end

Claims (6)

A plurality of stator windings arranged in an annular shape;
Four conductors for connecting the coil ends of the stator windings as U-phase, V-phase, W-phase, and three-phase Y connection as neutral points thereof,
A stator of a rotating electrical machine comprising a connection plate for holding the conductor,
The coil terminal is inserted through a hole provided in the conductor and connected,
The conductor is formed in a substantially C shape having an opening, is concentrically disposed and fixed on the connection plate disposed on the stator winding, and is one end of the conductor disposed on the inner side. A stator of a rotating electrical machine in which is led to the outer periphery through an opening of the conductor disposed on the outside. A stator for a rotating electrical machine according to claim 1,
The wiring board is provided with a wall between adjacent conductors,
The stator of the rotary electric machine in which the wall is formed continuously over the entire circumference of the conductor. A stator for a rotating electrical machine according to claim 1 or 2,
A stator of a rotating electrical machine in which the conductor is covered with a layered resin on the connection board. A stator for a rotating electrical machine according to any one of claims 1 to 3,
A stator of a rotating electrical machine, wherein the connection plate has a substantially annular shape along the arrangement of the stator windings, and a convex portion is formed on the outer peripheral side at a portion corresponding to the outer peripheral lead-out portion of the conductor. A stator for a rotating electrical machine according to claim 3 or 4,
A terminal plate for connecting to an external device is joined to the outer periphery leading portion of the conductor,
The junction between the terminal plate and the conductor is a stator of a rotating electric machine sandwiched between the connection plate and the layered resin. A stator for a rotating electrical machine according to any one of claims 1 to 5,
A rotating electrical machine having a rotor.