JP6428567B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a stator for a rotating electrical machine, and more particularly to a stator for a rotating electrical machine that fixes a lead wire of a sensor that detects characteristics of a stator coil.

  A winding coil, a segment coil, or the like is used as a stator coil of a rotating electrical machine such as a motor generator. For example, a segment coil is formed by inserting each linear portion of a conductor segment bent into a substantially U shape from one of the slots of the stator core and applying each linear portion protruding from the other to a component cuff attached to the end surface of the stator core. Bending is performed in contact with each other, the ends of the bent portions of the conductor segments adjacent in the radial direction are sequentially welded and wound around the teeth to form a coil (see, for example, Patent Document 1).

  Even when any coil such as a winding coil or a segment coil is used as the stator coil, the stator coil generates heat, and therefore it is necessary to measure the temperature of the stator coil. In order to measure the temperature of the stator coil, for example, a thermistor is attached to the surface of the coil end of the stator coil. The lead wire of this thermistor is fixed to the stator core or the case of the stator using a fixing member such as a screw, a clamp, or a clip.

JP 2007-31549 A

  When fixing members such as screws, clamps, clips, etc. are used to fix the lead wires, there is a part cost associated with the fixing members, and a structure for attaching the fixing members to the stator core or stator case is also required. Costs also occur. In particular, when the lead wire is long, a large number of fixing members are required, and the component cost is improved.

  Accordingly, an object of the present invention is to fix a lead wire with a component cuff without using a fixing member.

  A stator of a rotating electrical machine according to the present invention includes a cylindrical stator core, a stator coil wound around the stator core, a lead wire of a sensor for detecting characteristics of the stator coil, and a circle attached to an axial end surface of the stator core. A stator of a rotating electrical machine including an annular component cuff, wherein an outer peripheral portion of the component cuff is separated from an axial end surface of the stator core, and an outer peripheral portion of the component cuff and an axial end surface of the stator core An accommodation portion for sandwiching the lead wire is provided between them.

  According to the present invention, since the lead wire is fixed by the component cuff, no fixing member is required, and the cost related to the fixing member can be reduced.

It is a disassembled perspective view of the stator in this embodiment. It is a fragmentary perspective view of the stator which shows the attachment part of a thermistor. It is AA sectional drawing of FIG. It is a partially expanded perspective view of a component cuff.

  The stator 10 of the rotating electrical machine of this embodiment is used for a motor generator mounted on a hybrid vehicle, for example. As shown in FIG. 1, the stator 10 includes a stator core 20, a component cuff 40 that covers the axial end surface of the stator core 20, and a segment coil 30 that is wound around the stator core 20.

  As shown in FIG. 1, the stator core 20 is configured by laminating a number of electromagnetic steel plates. The stator core 20 includes an annular yoke 21 and a plurality of teeth 22 projecting inward in the stator radial direction from the inner peripheral surface of the yoke 21. The plurality of teeth 22 are arranged at equal intervals in the circumferential direction of the stator. Slots 23 are formed between teeth 22 adjacent in the stator circumferential direction, and a plurality of slots 23 are arranged at equal intervals in the stator circumferential direction. Each tooth 22 and each slot 23 extend along the stator axial direction.

  The yoke 21 of the stator core 20 includes three bolt fastening portions 21a that protrude toward the outer periphery in the radial direction. The bolt fastening portions 21a penetrate the stator core 20 for fixing the stator core 20 to a case (not shown). Bolt insertion holes 24 are respectively provided.

  An annular component cuff 40 made of an insulating resin is attached to one end face of the stator core 20 in the stator axial direction. The part cuff 40 includes an annular outer peripheral rib 41, an annular inner peripheral rib 42, and a plurality of radial ribs 43 that project radially outward from the outer periphery of the inner peripheral rib 42 and connect to the inner periphery of the outer peripheral rib 41. And.

  The radial ribs 43 are provided corresponding to the teeth 22 of the stator core 20, and are arranged on the teeth 22 of the stator core 20 at equal intervals in the circumferential direction like the teeth 22. A cuffer slot 44 is formed between adjacent radial ribs 43, and this cuffer slot 44 corresponds to the position of the slot 23 of the stator core 20.

  Further, a component cuffer (not shown) having the same configuration as that of the component cuffer 40 is attached to the other end surface of the stator core 20. The component cuff on the other side is mounted on the other end surface in the stator axial direction with the component cuff 40 turned over.

  The segment coil 30 is constituted by a plurality of conductor segments 31 inserted into all the slots 23 in the circumferential direction of the stator core 20. Although only a pair of conductor segments 31 is shown in FIG. 1, the conductor segments 31 are inserted into all slots 23 of the stator core 20.

  The conductor segment 31 is U-shaped and includes two linear legs 31a and a curved portion 31b that connects them. When the leg 31a of the conductor segment 31 is inserted into the cuffer slot of the component cuffer (not shown) on the other side, the slot 23 of the stator core 20 and the cuffer slot 44 of the component cuffer 40, the leg 31a has a length protruding from the cuffer slot 44. Yes. A portion of the leg 31 a protruding from the cuff link 44 is bent and joined to the leg 31 a of the other conductor segment 31. The segment coil 30 is formed by joining all the conductor segments 31. The segment coil 30 generates heat by supplying current. Since the efficiency decreases when the segment coil 30 reaches a high temperature, the temperature of the segment coil 30 may be measured, and the supply current to the segment coil 30 may be limited based on the measured temperature.

  A portion protruding from the slot 23 of the segment coil 30 schematically shown in FIG. 2 forms a coil end 32. As shown in FIG. 2, a thermistor 50 that measures the temperature of the segment coil 30 is attached to the surface of the coil end 32. One end of a lead wire 51 is connected to the thermistor 50, and the other end of the lead wire 51 is connected to a connector (not shown). The lead wire 51 is disposed along the outer peripheral rib 41 of the component cuff member 40. That is, after the lead wire 51 passes through the notch 47 of the outer peripheral rib 41 of the component cuff 40 and enters the receiving portion 55 (see FIG. 3) below the outer peripheral rib 41 and passes through the receiving portion 55 of the outer peripheral rib 41, It is pulled out to the upper surface of the outer peripheral rib 41 through the notch 48 of the outer peripheral rib 41.

  Next, the configuration of the outer peripheral rib 41 and the notches 47 and 48 will be described in detail with reference to FIGS. 3 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. 4 is a partially enlarged perspective view of the part cuff 40. As shown in FIG. 3, the outer peripheral rib 41 is separated from the end surface 21 b of the yoke 21 (the end surface in the axial direction of the stator core 20). That is, the outer peripheral rib 41 is in a state of floating from the end surface 21 b of the yoke 21. Between the outer peripheral rib 41 and the end surface 21 b of the yoke 21, an accommodating portion 55 that sandwiches and accommodates the lead wire 51 is formed.

  As shown in FIGS. 3 and 4, the outer peripheral rib 41 includes a peripheral wall 45 to which the radial outer ends of all the radial ribs 43 are respectively connected, and an annular edge 46 provided at the upper end of the peripheral wall 45. I have. The edge 46 extends toward the outside of the outer peripheral rib 41. The edge 46 includes a lower surface 46 a parallel to the end surface 21 b of the yoke 21, and a slope 46 b that continues from the upper end surface of the radial rib 43 and inclines upward toward the radially outer side.

  The distance H between the lower surface 46 a of the edge 46 and the end surface 21 b of the yoke 21 is set slightly smaller than the diameter R of the lead wire 51. With this setting, the lead wire 51 is sandwiched between the lower surface 46 a of the edge portion 46 and the end surface 21 b of the yoke 21, and the lead wire 51 is fixed inside the housing portion 55.

  In addition, by forming a projecting claw that projects downward on the outer end of the lower surface 46 a of the edge 46, the lead wire 51 can be prevented from falling off from the housing portion 55, and the lead wire 51 is securely fixed to the housing portion 55. be able to.

  As described with reference to FIG. 2, a notch 47 is formed in the vicinity of the thermistor 50 of the outer peripheral rib 41 to allow the lead wire 51 to pass from above the outer peripheral rib 41 to the accommodating portion 55. Further, a notch 48 is formed at a position where the other end of the lead wire 51 of the outer peripheral rib 41 is pulled out from the accommodating portion 55 to the upper side of the outer peripheral rib 41.

  As shown in FIG. 4, the notch 47 is provided at a position corresponding to the cuffer slot 44 of the edge 46. The notch 47 is formed by cutting the edge 46 into a U-shape of the outer opening. The opening width W of the notch 47 is larger than the diameter R of the lead wire 51. The notch 48 is formed in the same manner as the notch 47.

  The notch 47 may be provided at a position corresponding to the radial rib 43 of the edge portion 46. When the notch 47 is provided at a position corresponding to the radial rib 43, a decrease in rigidity of the outer peripheral rib 41 can be suppressed.

  Next, fixing of the lead wire 51 will be described. First, the mounting positions of the component cuffer 40 and the thermistor 50 are adjusted so that the thermistor 50 and the notch 47 are arranged in the vicinity. Then, as shown in FIG. 2, the lead wire 51 from the thermistor 50 is inserted into the accommodating portion 55 from above the outer peripheral rib 41 through a notch 47 positioned in the vicinity of the thermistor 50. Since the vertical interval of the accommodating portion 55, that is, the interval H between the lower surface 46 a of the edge portion 46 and the end surface 21 b of the yoke 21 is narrower than the diameter R of the lead wire 51, the lead wire 51 is pushed into the accommodating portion 55. The lead wire 51 is fixedly held. Further, the other end of the lead wire 51 of the thermistor 50 is pulled out from the accommodating portion 55 to the upper side of the outer peripheral rib 41 through the notch 48.

  As described above, the lead wire 51 is sandwiched and fixed by the lower surface 46 a of the edge 46 and the end surface 21 b of the yoke 21 in the housing portion 55. For this reason, fixing members such as screws, clamps, and clips for fixing the lead wire 51 are not required, and an operation for attaching these fixing members is not required, so that the cost related to the fixing members can be reduced. Furthermore, since the lead wire 51 is fixed in all the sections sandwiched between the lower surface 46a of the edge 46 and the end surface 21b of the yoke 21, the portion to be fixed becomes longer and firmly fixed.

  As shown in FIG. 3, in the slot 23 of the stator core 20, an insulating paper 60 is provided for electrical insulation between the conductor segment 31 inserted into the slot 23 and the stator core 20. The insulating paper 60 has a protruding portion 60 a that protrudes from the end surface of the stator core 20 in order to prevent contact between the opening edge of the slot 23 and the conductor segment 31.

  Since the edge 46 of the outer peripheral rib 41 is provided at the upper end portion of the peripheral wall 45, it does not interfere with the protruding portion 60a of the insulating paper 60, and the protruding portion 60a is deformed by the outer peripheral rib 41 interfering with the protruding portion 60a. Can be prevented.

  In addition, after the segment coil 30 is formed, varnish is dropped from above the segment coil 30 as indicated by an arrow F1 in order to fill the gaps between the conductor segments 31. A part of this varnish is transmitted through the coil end 32 and flows down to the slope 46 b of the outer peripheral rib 41. Since the inclined surface 46b of the outer peripheral rib 41 is inclined so as to descend inward in the radial direction, the varnish that has flowed down to the inclined surface 46b of the outer peripheral rib 41 flows into the outer peripheral rib 41 as indicated by an arrow F2.

  For this reason, the varnish is suppressed from reaching the bolt insertion hole 24 provided outside the outer peripheral rib 41 and the varnish is also prevented from adhering to the bolt insertion hole 24. Accordingly, it is possible to suppress a decrease in bolt fastening force due to varnish adhesion to the bolt insertion hole 24.

  In the above-described embodiment, the two cutouts 47 and 48 are formed in the edge portion 46 in order to insert the lead wire 51 between the lower surface 46a of the edge portion 46 and the end surface 21b of the yoke 21. The notches 47 and 48 are not limited to two, and three or more notches may be formed in the circumferential direction of the edge 46. For example, the insertion / removal position of the lead wire 51 with respect to the outer peripheral rib 41 can be set to an arbitrary position by forming a large number of notches at predetermined intervals over the entire periphery of the edge portion 46.

  10 stator, 20 stator core, 21 yoke, 21a bolt fastening portion, 21b end face, 22 teeth, 23 slot, 24 bolt insertion hole, 30 segment coil, 31 conductor segment, 32 coil end, 40 parts cuff, 41 outer rib, 42 in Peripheral rib, 43 radial rib, 44 cuff slot, 45 peripheral wall, 46 edge, 46a bottom surface, 46b slope, 47, 48 notch, 50 thermistor, 51 lead wire, 55 receiving part, 60 insulating paper, 60a protruding part.

Claims (1)

Rotation comprising a cylindrical stator core, a stator coil wound around the stator core, a sensor lead wire for detecting the characteristics of the stator coil, and an annular part cuff attached to the axial end surface of the stator core An electric stator,
The outer peripheral portion of the component cuff is spaced from the axial end surface of the stator core, and an accommodating portion for sandwiching the lead wire is provided between the outer peripheral portion of the component cuff and the axial end surface of the stator core. A stator for a rotating electrical machine.

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