JP2012115068A - Stator for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cracking of an insulating coat of a coil generated when a coil conductor forming the coil of a stator of a rotary electric machine and a power line supplying electric power to the coil or sending out electric power from the coil to outside are connected to each other by welding.SOLUTION: A coil conductor end part 26 comes out from a slot 24 of a stator core 12 and leads to an end 20 connected to a power line 22. A support member 28 is installed on the outer peripheral side of a coil. The support member 28 is fixed to the stator core 12, and support arms 32 are located on the outer peripheral side of the coil conductor end part 26. The support arms 32 suppress displacement of the coil conductor end part 26 to the radial outer side.

Description

  The present invention relates to a structure of a stator of a rotating electrical machine.

  The electric motor is an electric device that supplies electric power to one of two relatively movable members to form a magnetic field, and moves the other member by interaction with the magnetic field. Conversely, by moving the latter member, power can be extracted from the former member, which is a generator. That is, the electric motor and the generator have the same mechanical structure. In the following description, “rotary electric machine” is used as a general term for an electric motor and a generator.

  Rotation by moving a coil to a fixed member of two members of a rotating electrical machine, forming a magnetic field that moves by this coil, for example, a rotating magnetic field, and moving the other member by interaction with this magnetic field Electric is known. In order to supply electric power from the outside to a fixed member, that is, a coil provided in the stator, a power line connected to an external device, for example, a power source, at an end of a conductive wire forming the coil (hereinafter referred to as a coil conductive wire). Is connected. Patent Document 1 below discloses a technique for connecting a coil conductor and a power line by welding.

JP 2004-25303 A

  When welding the coil conductor and the power line, the position of the end of the coil conductor is corrected to an appropriate position. During this position correction, the coil conductor may move, the insulating coating applied to the coil may break, and an insulation failure may occur.

  An object of this invention is to suppress generation | occurrence | production of the crack of an insulating film in the case of alignment of the edge of a coil conducting wire.

  The stator of the rotating electrical machine of the present invention has a support member that supports the end of the coil conductor including the end welded to the power line from the outside in the radial direction of the core.

  By suppressing the movement of the end of the coil conductor, the occurrence of cracks in the insulating coating is suppressed.

It is a perspective view which shows the stator of a rotary electric machine. It is a perspective view which shows the principal part of this embodiment. It is a perspective view which shows a supporting member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an appearance of a stator 10 of a rotating electrical machine. The stator 10 has an annular or cylindrical stator core 12 having a general shape, and magnetic poles 14 are arranged in the circumferential direction on the inner periphery of the stator core 12. A cylindrical stator case 16 is disposed so as to surround the outer periphery of the stator core 12. The stator case 16 is made of a thin steel plate. Further, the end of the stator case 16 in the cylindrical axis direction extends from the end surface of the stator core 12 (in FIG. 1, it extends upward).

  A conductive wire is wound around the magnetic pole 14 to form a coil 18. A conducting wire forming the coil 18 is referred to as a coil conducting wire. As shown in FIG. 1, an end 20 of the coil conductor protrudes upward in FIG. 1 from the coil end portion. In the stator 10, two sets of U-phase, V-phase, and W-phase coils are provided, and a total of 12 ends 20 of the coil conductors are provided. The ends 20 of the coil conductors are electrically connected to each other and to the ends on the neutral point side, but the connection lines are omitted in FIG. A power line 22 for supplying three-phase AC power is connected to one end 20 of each of the U-phase, V-phase, and W-phase coil conductors. The power line 22 also has a function of sending out the generated power to the outside when the power is generated by the rotating electrical machine.

  FIG. 2 is a perspective view showing a main part of the stator of the rotating electrical machine of the present embodiment. Most of the coil 18 is omitted, and only a part of the coil conductor is shown. The portion of the coil conducting wire shown in the drawing is a portion protruding from the slot 24 which is a space between the magnetic poles 14 connected to the end 20 connected to the power line 22. This coil conductor portion is referred to as a coil conductor end portion 26. As shown in FIG. 2, the coil conductor end portion 26 exits from the outermost peripheral side of the slot 24, and once upwards, immediately turns obliquely upward along the circumferential direction of the stator, and extends upward again. Finally, the portion extending upward is connected to the power line 22. When the coil conductor end portion 26 and the power line 22 are welded, the coil conductor end portion 26 is aligned. At this time, if the coil conductor end portion 26 is greatly displaced, the insulating coating formed of varnish applied to the coil 18 may break. In particular, when the coil conductor end portion 26 is displaced outward in the radial direction of the stator, the coil conductor end portion 26 moves away from the outer periphery of the coil 18. By this movement, a gap between the coil and the coil conductor just inside the coil conductor end portion 26 spreads, and a crack is generated here.

  In the present embodiment, a support member 28 is disposed on the outer peripheral side of the coil 18 in order to suppress the displacement of the coil conducting wire end portion 26 in the radially outward direction. FIG. 3 is a perspective view showing the support member 28 alone. The support member 28 includes an arc-shaped base 30 that follows the curvature of the stator core 12, a support arm 32 that supports the coil conductor end portion 26, and legs 34 and 36 for fixing the support member to the stator core 12. Have.

  The base portion 30 of the support member has an arc shape along the annular portion that connects the yoke portions 38 of the stator core 12, that is, the magnetic poles 14. And it is arrange | positioned and fixed to the end surface of the yoke part 38, in other words, the part between the outer peripheral surface of the coil 18 and the inner peripheral surface of the stator case 16. Three support arms 32 are provided on the inner peripheral side of the arc of the base 30. When the support member 28 is fixed at a predetermined position with respect to the stator core 12, the inner peripheral surface of the support arm 32 is positioned close to or in contact with the coil conductor end portion 26 on the radially outer side. As shown by “A” in FIG. 2, this position can be a position corresponding to a portion extending obliquely upward of the coil conductor end portion 26. Further, this position is preferably close to the end 20 of the coil conducting wire in the circumferential direction, but the position is determined in consideration of interference with other members such as the power line 22. Moreover, the shape of the coil conducting wire end portion 26 can also be a shape other than the above-described upward, obliquely upward, and upwardly extending shapes, for example, a shape that simply extends upwardly.

  In this embodiment, there are two types of legs of the support member 28. The legs 34 are provided so as to extend further outward in the circumferential direction from both ends of the base 30. In the following description, it is referred to as an end leg portion 34 in the sense that it is provided at the end of the support member. The end legs 34 extend along the inner peripheral surface of the stator case 16 when the support member 28 is disposed at a predetermined position. The support member 28 is fixed to the stator core 12 by welding the end legs 34 and the stator case 16. Another kind of leg portion 36 is provided substantially at the center in the direction along the arc of the base portion 30. In the following description, it is referred to as a central leg 36 in the sense that it is provided at the center of the support member 28. The central leg portion 36 is a protrusion that extends further downward from the lower surface of the base portion 30, that is, the surface that contacts the end surface of the stator core 12. The center leg portion 36 fits into the opening of the core outer peripheral groove 40 provided on the outer peripheral surface of the stator core 12 and determines the position of the support member 28. The center leg part 36 is provided according to the position of the core outer periphery groove | channel 40, and may be provided in positions other than a center. A plurality of them can be provided. On the contrary, if the support member 28 is positioned by another method, the central leg portion 36 may not be provided. Further, the support member 28 can be fixed not by welding but by adhesion. In this case, the end leg portion 34 may not be provided.

  12 stator core, 14 magnetic pole, 16 stator case, 18 coil, 20 end of coil conductor, 22 power line, 26 end of coil conductor, 28 support member, 30 base, 32 support arm, 34, 36 leg.

Claims (1)

  A stator of a rotating electrical machine in which an end of a coil conductor wound around a stator core of a rotating electrical machine and a power line for transmitting and receiving power between the coil and an external device are connected by welding, and is welded to the power line. A stator of a rotating electrical machine having a support member that supports an end portion of a coil lead wire including an end of the coil lead wire from the radially outer side of the stator core.

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