JP4138823B2 - Motor stator structure - Google Patents

Description

  According to the present invention, a stator is configured by arranging a plurality of coils each having a winding wound around an iron core in an annular shape around an axis, and one end of each winding of each coil is connected via a connection terminal. The present invention relates to a motor stator structure.

  In general, a stator of a direct current brushless motor is configured by sequentially arranging a plurality of U-phase coils, V-phase coils, and W-phase coils, which are wound around an outer periphery of an iron core via an insulator, in the circumferential direction. . The ends of the windings drawn from the radially inner ends of the coils are connected together to form a ground (neutral point).

  In Japanese Patent Application No. 2005-254696, the applicant of the present application bent the end portion of a winding made of a rectangular wire drawn from each coil into a U-shape, and the windings of two adjacent coils. It has been proposed to form the neutral point by connecting U-shaped bent portions to both ends of a connection terminal by fusing.

  By the way, a round wire having a circular cross section has no directionality when bent, but a rectangular wire having a rectangular cross section can be easily bent in two directions perpendicular to the surface. It is difficult to bend in a direction inclined with respect to one direction. Therefore, if a flat wire is used for the winding, the work of bending the end of the winding drawn from each coil into a U-shape cannot be completely mechanized, and manual processing is required, resulting in a processing cost. There is a problem that increases significantly.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to enable connection to a neutral point without bending the winding end of each coil of a stator of a motor into a U shape.

  In order to achieve the above object, according to the first aspect of the present invention, a stator is formed by arranging a plurality of coils each having a winding wound around an iron core in an annular shape around an axis, and each coil In a stator structure of a motor in which one end of each winding is connected via a connection terminal, a neutral point bus ring formed in an annular shape with a bent wire is arranged along the inner periphery of the stator, The sex point bus ring includes a plurality of large-diameter portions and a plurality of small-diameter portions that alternately extend in the circumferential direction, and a plurality of bridging portions that connect the large-diameter portions and the small-diameter portions in the radial direction, and the end portions of the windings Is located between two adjacent crossovers extending in the radial direction, and one end of the connection terminal is connected to the end of the winding and the other end is connected to the crossover. A motor stator structure is proposed.

  According to the invention described in claim 2, in addition to the configuration of claim 1, the bent portion connected to the large diameter portion from one of the two adjacent crossing portions of the neutral point bus ring is formed from a coil. The stator of the motor is characterized in that a space for inserting a nozzle for potting the lead portion of the winding is formed inside the bent portion, and located outside the lead portion of the winding of the wire in the radial direction. A structure is proposed.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the winding of the coil is composed of a rectangular wire, and the neutral point bus ring is composed of a round wire. A stator structure for a motor is proposed.

  In addition, the 1st, 2nd 1st transition part 41c, 41d of embodiment respond | corresponds to the transition part of this invention.

  According to the configuration of claim 1, the neutral point bus ring disposed along the inner peripheral portion of the stator has a large diameter portion extending in the circumferential direction, a crossing portion extending in the radial direction, and extending in the circumferential direction. A small-diameter portion and a transition portion extending in the radial direction are alternately provided, and the end portion of the winding drawn out from the coil is positioned between two adjacent transition portions extending in the radial direction, and one end of the connection terminal Is connected to the end of the winding and the other end is connected to the crossover, so that the neutral point can be obtained by connecting the end of the winding to the neutral point bus ring without bending it into a U-shape. It can be formed and the processing cost for bending the winding can be reduced. In addition, since the two transition portions of the neutral point bus ring and the end portions of the windings both extend in the radial direction, the operation of connecting the transition portions and the end portions to the connection terminals is easy.

  According to the second aspect of the present invention, the bent portion connected to the large-diameter portion from one of the two adjacent crossing portions of the neutral point bus ring is positioned radially outside the lead-out portion of the winding from the coil. Since the space for inserting the nozzle for potting is formed inside the bent portion, the lead portion of the winding can be potted by inserting the nozzle without being obstructed by the neutral point bus ring.

  According to the third aspect of the present invention, since the winding is composed of a rectangular wire, not only can the coil occupancy rate be increased, but there is no need to bend the rectangular wire that is difficult to bend into a U shape. Therefore, the cost reduction effect is increased. In addition, since the neutral point bus ring is configured by a round wire, it is easy to bend it into a predetermined shape.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 10 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a power unit of a hybrid vehicle, FIG. 2 is a view taken along line 2-2 in FIG. 1, and FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 3, FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 3, FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. 8 is a front view of a sex point bus ring, FIG. 8 is a perspective view of a connection terminal, FIG. 9 is an explanatory view of a winding end processing step, and FIG. 10 is an explanatory view of a fusing step.

  As shown in FIG. 1, the power unit of the hybrid vehicle includes a DC brushless motor M arranged between the engine E and the transmission T. A motor case 13, a torque converter case 14, and a transmission case 15 are coupled to the right side surfaces of the cylinder block 11 and the crankcase 12 of the engine E, and the shaft end of the crankshaft 16 supported between the cylinder block 11 and the crankcase 12. The rotor 17 of the motor M is fixed to the motor. The inner periphery of the annular stator 19 faces a plurality of permanent magnets 18 fixed to the outer periphery of the rotor 17 via a predetermined air gap, and a plurality of annular mounting brackets 20 fitted to the outer periphery of the stator 19 are provided. Are fixed to the motor case 13 with bolts 21.

  The torque converter C housed in the torque converter case 14 includes a turbine runner 22 and a pump impeller 23, and a side cover 24 that is coupled to the turbine runner 22 and covers the pump impeller 23 is connected to the motor M via the drive plate 25. Connected to the rotor 17. The pump impeller 23 of the torque converter C is coupled to the left end of the main shaft 26 supported by the transmission case 15.

  As shown in FIGS. 2 and 3, the stator 19 of the motor M is formed by connecting a plurality (18 in the embodiment) of coils 31... Having the same structure in the circumferential direction. Three of the coils 31 are shown completely. Each coil 31 is formed by covering an outer periphery of an iron core 32 (see FIG. 1) in which a large number of steel plates are laminated with an insulator (bobbin) 33 made of a synthetic resin, and winding a winding 34 around the insulator 33 in a plurality of layers. The winding 34 is formed of a rectangular wire having a rectangular cross section, and the space formed between the adjacent windings 34 in a state of being wound around the insulator 33 is minimized to increase the occupancy rate. Yes.

  The 18 coils 31 are composed of six U-phase coils 31 (U), V-phase coil coils 31 (V), and W-phase coils 31 (W) arranged alternately in the circumferential direction. In order to supply a U-phase current to the U-phase coils 31 (U), to supply a V-phase current to the V-phase coils 31 (V), and to supply a W-phase current to the W-phase coils 31 (W), A U-phase bus ring 35, a V-phase bus ring 36, and a W-phase bus ring 37 are provided on the outer periphery of the stator 19. Each of the bus rings 35, 36, and 37 is formed by bending a metal wire in an annular shape, and both ends thereof are overlapped and connected to U-phase, V-phase, and W-phase power supply terminals 38, 39, and 40, respectively. 2 and 3, in order to distinguish the U-phase, V-phase, and W-phase bus rings 35, 36, and 37, three levels of light and shade are added.

  One end of the winding 34 of the U-phase coil 31 (U) arranged at every third U-phase bus ring 35 is connected via the connection terminal 43, and every other three is arranged on the V-phase bus ring 36. One end of the winding 34 of the V-phase coil 31 (V) is connected via the connection terminal 43, and the W-phase bus ring 37 is wound every three W-phase coils 31 (W). One end of the wire 34 is connected via the connection terminal 43.

  Next, the connection of the other end of the windings 34 of the 18 coils 31 will be described with reference to FIGS. For each of the six U-phase, V-phase, and W-phase coils 31 (U), 31 (V), 31 (W), the other end of the winding 34 is connected to a common neutral point bus ring 41. Wired with the same structure.

  That is, the insulator 33 includes an extending portion 33b extending radially inward from the main body portion 33a around which the winding 34 is wound, and an outer partition wall 33c positioned radially outward from the extending portion 33b and radially inward. The located inner partition wall 33d protrudes in the axial direction. When the two adjacent coils 31 and 31 are connected to each other, the opposing ends of the two outer partition walls 33c and 33c are in contact with each other, and the opposing ends of the two inner partition walls 33d and 33d are slightly overlapped. To do. Therefore, when the stator 19 is configured by connecting 18 coils 31..., An annular groove is formed between the 18 outer partition walls 33 c and 18 inner partition walls 33 d.

  At a position near one end in the circumferential direction of the outer partition wall 33c of the insulator 33, a U-shaped winding notch 33e through which a lead-out portion 34b for pulling out the end portion 34a of the wound winding 34 passes, A U-shaped notch 33f for bus ring through which the neutral point bus ring 41 passes is formed. A U-shaped bus ring notch 33g through which the neutral point bus ring 41 passes is formed in the inner partition wall 33d of the insulator 33 at a position facing the radially inner side of the bus ring notch 33f of the outer partition wall 33c. The Further, a connection terminal fixing wall 33h projects from the radially inner side of the outer partition wall 33c, and a U-shaped locking groove 33i is formed in the connection terminal fixing wall 33h.

  The connection terminal 42 includes a plate-like fixed portion 42a, a groove-shaped bus ring connection portion 42b formed at one end of the fixed portion 42a, and a groove-shaped winding formed at the other end of the fixed portion 42a. The connection part 42c is provided, and the latching protrusion 42d is formed in the center of the fixing | fixed part 42a. The fixing portion 42a of the connection terminal 42 is inserted into the gap between the outer partition wall 33c and the connection terminal fixing wall 33h, and the locking protrusion 42d provided on the fixing portion 42a at that time is the locking groove 33i provided on the connection terminal fixing wall 33h. It is positioned so that it will not fall off by engaging with.

  The neutral point bus ring 41 is formed in a substantially annular shape with a round wire opened at one place, and a plurality of large diameter portions 41a... Extending in the circumferential direction and a plurality of small diameter portions 41b extending in the circumferential direction. A plurality of first connecting portions 41c that connect one end portions of the large-diameter portions 41a ... and the small-diameter portions 41b that are opposed to each other in the radial direction, and the other end portions that face the large-diameter portions 41a ... and the small-diameter portions 41b ... And a plurality of second crossover portions 41d connected in the radial direction.

  Next, an assembly procedure of the stator 19 having the above configuration will be described.

  As shown in FIG. 9A, the winding 34 to be wound around the outer periphery of the insulator 33 is passed through the winding notch 33e of the outer partition 33c from one end of the inner partition 33d of the insulator 33, and the winding The winding 34 is wound from the radially inner portion of the insulator 33 in a state in which the tension shown by the arrow A is applied to the thrown-out wire portion 34c of 34 and is fixed so as not to loosen. Subsequently, as shown in FIG. 9B, the winding 34 is cut between the winding start end 34a of the winding 34, that is, between the outer partition wall 33c and the inner partition wall 33d of the insulator 33, and is discarded. The line portion 34c is removed. Further, the unnecessary portion from the end 34d at the end of winding of the winding 34 is cut in the same manner.

  After the 18 coils 31, which have finished winding the winding 34 in this way, are combined in an annular shape, the winding 34 is connected to the insulator 33 with the winding start end 34 a fixed to the insulator 33, as shown in FIG. 3. The coil 42 is fitted to the winding connection part 42c of the terminal 42 and connected by fusing, and the first and second transition parts 41c and 41d of the neutral point bus ring 41 are fitted to the bus ring connection part 42b of the connection terminal 42. And connect by fusing.

  At this time, the first and second transition portions 41c and 41d of the neutral point bus ring 41 are fitted and positioned in the bus ring notch 33f of the outer partition wall 33c of the insulator 33 and the bus ring notch 33g of the inner partition wall 33d. The winding start end 34a of the winding 34 is fitted and positioned in the winding notch 33e of the outer partition wall 33c, and the first and second transition portions 41c and 41d of the neutral point bus ring 41 and Since the end 34a of the winding 34 extends in a direction orthogonal to the outer partition wall 33c and the inner partition wall 33d of the insulator 33, as shown in FIG. 10, a bus ring connection is made by a pair of openable and closable fusing electrodes 44 and 45. When the part 42b or the winding connection part 42c is crushed and welded, the fusing electrodes 44 and 45 interfere with the outer partition wall 33c and the inner partition wall 33d. It is prevented.

  Thus, when connecting the end 34a on the winding start side of the winding 34 of each coil 31 at the neutral point, the end of the winding 34 is used as the lead-out portion in the conventional one that does not use the neutral point bus ring 41. After bending inward in the radial direction from 34b, it was necessary to bend twice further so as to form a U-shape. According to the present embodiment, the end 34a on the winding start side with respect to the drawer 34b Therefore, even if the winding 34 made of a flat wire that is troublesome to be bent is employed, it is possible to reduce the number of processing steps and contribute to cost reduction. it can.

  On the winding end side of the winding 34, one end of the connection terminal 43 is connected to the end 34d of the winding 34 by fusing, and the other end of the connection terminal 43 is connected to the U-phase bus ring 35 and the V-phase bus ring. Either 36 or W-phase bus ring 37 is connected by fusing.

  Subsequently, a potting process is performed to harden the connection portion with a synthetic resin and increase the mechanical durability against disconnection and the chemical durability against corrosion. That is, as shown in FIG. 4, the potting nozzle 46 is inserted between the outer partition wall 33c and the inner partition wall 33d of the insulator 33 to inject uncured synthetic resin. When the synthetic resin injected into the annular space surrounded by the outer partition wall 33c and the inner partition wall 33d is cured, the connection terminals 42 are embedded therein to complete the potting 47.

  At this time, the end portions of the outer partition walls 33c of the adjacent insulators 33 and the end portions of the inner partition walls 33d are in contact with each other, so that leakage of the synthetic resin from the connection portion between the insulators 33 and 33 is prevented. . In particular, since the end portions of the inner partition wall 33d overlap each other, leakage of the synthetic resin from that portion can be prevented more reliably. The outer partition wall 33c is formed with a winding notch 33e and a bus ring notch 33f, and the inner partition wall 33d is formed with a bus ring notch 33g. The notches 33e to 33g have ends of the winding 34. Since the first and second transition portions 41c and 41d of the portion 34a or the neutral point bus ring 41 are fitted, the leakage of the synthetic resin from the first and second transition portions 41c and 41d can be minimized.

  In this embodiment, as shown in FIG. 9 (A), the winding 34 is started to wind from passing through the winding notch 33e of the outer partition 33c from one end of the inner partition 33d. If the winding notch is formed in the inner partition 33d and the winding 34 is passed through, the following problems occur. That is, when the discarded wire portion 34c is cut after the winding 34 has been wound, the winding notch 33e of the outer partition wall 33c is closed by the end portion 34a of the winding 34. By cutting 34c, the winding notch of the inner partition wall 33d remains open without being blocked, and when potting 47 is performed in this state, a large amount of synthetic resin leaks from the opened winding notch. There's a problem.

  However, in this embodiment, the winding notch is not formed in the inner partition wall 33d, and the discard line portion 34c of the winding 34 is drawn out through the end portion of the inner partition wall 33d. do not do.

  In addition to the region sandwiched between the outer partition wall 33c and the inner partition wall 33d, the lead-out portion 34b of the winding 34 in the region radially outside the outer partition wall 33c is also fixed by the potting 48 so that the position thereof does not move. (See FIG. 4). At this time, if the large-diameter portion 41a of the neutral point bus ring 41 is positioned so as to cover the lead-out portion 34b of the winding 34, the potting nozzle 46 cannot be inserted. Since the space for inserting the potting nozzle 46 is secured by extending the bent portion 41e with the crossing portion 41c radially outward, the drawing portion 34b of the winding 34 can be reliably potted 48.

  A portion where the end 34 d of the winding 34 on the winding end side and the U-phase bus ring 35, V-phase bus ring 36 and W-phase bus ring 37 are connected via the connection terminal 43 is also potted.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, a rectangular wire is used for the winding 34, but a round wire may be used.

  Further, in the embodiment, a part of the neutral point bus ring 41 is opened, but it may be formed in a completely closed annular shape.

Longitudinal section of the power unit of the hybrid vehicle 2-2 line view of FIG. Part 3 enlarged view of FIG. 4-4 enlarged sectional view of FIG. FIG. 5 is an enlarged sectional view taken along line 5-5. 6-6 enlarged sectional view of FIG. Front view of neutral point bus ring Perspective view of connection terminal Illustration of winding end treatment process Explanatory diagram of the fusing process

Explanation of symbols

19 Stator 31 Coil 32 Iron core 34 Winding 34a End 34b Lead-out part 41 Neutral point bus ring 41a Large diameter part 41b Small diameter part 41c First transition part (transition part)
41d Second transition part (transition part)
41e Bending part 42 Connection terminal 46 Nozzle 48 Potting L Axis line

Claims (3)

A plurality of coils (31) each having a winding (34) wound around an iron core (32) are annularly arranged around the axis (L) to constitute a stator (19), and each coil (31) is wound. In the stator structure of the motor in which one end (34a) of the wire (34) is connected via the connection terminal (42),
A neutral point bus ring (41) formed in an annular shape by a bent wire is arranged along the inner peripheral portion of the stator (19), and the neutral point bus ring (41) is a plurality of alternately extending in the circumferential direction. A large diameter portion (41a) and a plurality of small diameter portions (41b), and a plurality of crossover portions (41c, 41d) for connecting the large diameter portion (41a) and the small diameter portion (41b) in the radial direction, 34) is located between two adjacent crossing portions (41c, 41d) extending in the radial direction, and one end of the connection terminal (42) is the end of the winding (34). A stator structure for a motor, characterized in that it is connected to a portion (34a) and the other end is connected to the crossover portion (41c, 41d).   The bent portion (41e) connected to the large-diameter portion (41a) from one of the two adjacent transition portions (41c, 41d) of the neutral point bus ring (41) is wound from the coil (31) (34 Nozzle (46) which is located radially outside the lead-out portion (34b) and pots (48) the lead-out portion (34b) of the winding (34) inside the bent portion (41e). The stator structure for a motor according to claim 1, wherein a space for inserting the stator is formed. The winding (34) of the coil (31) is composed of a flat wire, and the neutral point bus ring (41) is composed of a round wire. The stator structure of the motor.

Images