JP2006067674A - Segment conductor type armature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a segment conductor type armature in which projection length at the joint side end can be shortened while suppressing alteration of the basic structure of an armature winding as much as possible, and projection length at a U-shaped bend can also be shortened. <P>SOLUTION: One U-phase winding 90 includes a plurality of wave winding portions 72 and a plurality of lap winding portions 82 arranged alternately. The wave winding portion includes a first layer conductor 73a and a fourth layer conductor 73b spaced apart by a first pitch from each other, a U-shaped bend 75, and a pair of joint side ends 77a and 77b. The lap winding portion includes a second layer conductor 83a and a third layer conductor 83b spaced apart by a second pitch from each other, a U-shaped bend 85, and a pair of joint side ends 87a and 87b. Forward ends 78a and 88a of the joint side ends extending from the first layer conductor and the second layer conductor spaced apart by a third pitch are bonded to each other, and forward ends 88b and 78b extending from the third layer conductor and the fourth layer conductor spaced apart by a fourth pitch are bonded to each other. The third and fourth pitches are equal and smaller than the pole pitch by one or more slot pitch. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a segment conductor type armature.

One type of AC motor is one in which a winding of an armature functioning as a stator is joined to a pair of free ends of a number of U-shaped segment conductors. A pair of straight portions (conductors) of U-shaped segment conductors are inserted into the slots of the armature core from the axial direction, and joined to the free ends (joint end portions) of adjacent segment conductors to produce armature windings. . The U-shaped bent portion and the joining side end portion protrude in the axial direction from one end and the other end of the armature core, respectively. The segment conductor type armature (see Patent Document 1) in which the armature winding is composed of the segment conductor can increase the line space factor in the slot. As a result, it is small and light, has excellent heat dissipation, and is suitable as a vehicle-mounted AC motor.
Japanese Patent Laid-Open No. 11-164506

  For example, an auxiliary motor mounted on an engine is desired to be further miniaturized in order to improve mountability. However, the conventional segment conductor type armature has a limitation in shortening the axial length (protrusion amount) of the joint side end due to restrictions on the production of windings that join the joint ends of the segment conductor. It was. In particular, when the number of slots per phase is large (for example, 2, 3,...) And the pitch between the pair of straight portions is long, the axial length of the joining side end portion becomes long.

  The present invention has been made in view of the above-mentioned problems, and while suppressing changes in the basic structure of the armature winding as much as possible, it is possible to shorten the protruding length of the joining side end, and to protrude the U-shaped bent portion. An object of the present invention is to provide a segment conductor armature that can be shortened in length.

  The inventor of the present application has conceived that the pitch of the pair of linear portions (conductor portions) of the segment conductor to which the tips of the joining side end portions are joined is selected to be smaller than the magnetic pole pitch, and has completed the present invention.

  The segment conductor type armature according to the present invention includes an armature core having n slots (n = 2, 3,...) Per phase and a diameter in the slot. The armature winding is composed of a multi-phase winding having a first layer conductor, a second layer conductor, a third layer conductor, and a fourth layer conductor that are accommodated in order from the inner side to the outer side. A plurality of wave winding portions and a plurality of overlapping winding portions that are connected in series or in parallel with each other and each of the first phase windings and the second phase windings constituting each phase winding, and are alternately arranged in the circumferential direction. Including.

  The wave winding portion includes a first layer conductor and a fourth layer conductor separated from each other by a first pitch W1, a U-shaped bent portion connecting each end of the first layer conductor and the fourth layer conductor, a first layer conductor, and a first layer conductor. A pair of joint-side ends that extend from each other end of the four-layer conductor and are bent away from each other in the circumferential direction. The lap winding portion includes a second layer conductor and a third layer conductor separated from each other by a second pitch W2, a U-shaped bent portion connecting each end of the second layer conductor and the third layer conductor, a second layer conductor and a second layer conductor. The three-layer conductor includes a pair of joint-side end portions that extend from the respective other ends and are bent so as to approach in the circumferential direction. The ends of the joint-side ends extending from the first layer conductor and the second layer conductor separated from each other by the third pitch W3 are joined to each other, and from the third layer conductor and the fourth layer conductor separated from each other by the fourth pitch W4, respectively. The tips of the extended joining side end portions are joined to each other.

  Here, the first phase winding and the second phase winding are wound n times in opposite directions in the circumferential direction of the armature core, and the wave winding portion and the lap winding portion are adjacent slots each time they circulate. Has been placed in the transition. Further, the tip ends of the pair of joining side end portions of the wave winding portion are opened at substantially two magnetic pole pitches, and the tip ends of the pair of joining side end portions of the overlapping winding portion are closed at substantially zero pitch. Further, the third pitch W3 and the fourth pitch W4 are equal (W3 = W4), and both the third pitch and the fourth pitch are set to be one slot pitch or more smaller than the magnetic pole pitch Wmp (W3 = W4 ≦ Wmp−1). Yes.

  According to the segment conductor type armature of the present invention, the third pitch and the fourth pitch, which are circumferential pitches of the joining side end, are smaller than the magnetic pole pitch by one slot pitch or more, so the protruding length of the joining side end is shortened. it can. Further, the overall length of the armature winding can be shortened, and the efficiency is improved by the resistance reduction effect.

  According to the segment conductor type armature of the second and third aspects, the axial protruding length of the U-shaped bent portion of the lap winding portion can be shortened. According to the segment conductor type armature of the fourth aspect, it is possible to suppress the protruding length in the axial direction of the U-shaped bent portion of the wave winding portion to be equal to or less than that of the full-pitch winding. According to the segment conductor armature of claim 5, the dead space between the tips of the U-shaped bent portions of the wave winding portion and the lap winding portion is reduced, and the axial protruding length can be reduced.

(B) Overall The segment conductor type armature is composed of an armature core and an armature winding. The armature winding is formed by inserting a segment conductor set into a slot of an armature core and joining its free end (joint end). The number n of slots per phase of each pole of the armature core is plural (n = 2, 3,...). The number of straight portions (conductor portions) of the segment conductors accommodated in each slot is four, one set (4) or two sets (8). Also, the number of poles (number of poles) formed in the circumferential direction on the armature core can be 6, 8, 10, 10.

  The armature winding includes multi-phase (for example, three-phase) windings, and each phase winding includes a first phase winding and a second phase winding connected in series or in parallel. Parallel connection is suitable for low voltage (large current) specifications. The first phase windings are formed by alternately connecting a plurality of wave winding portions and a plurality of lap winding portions, and the second phase windings are similarly configured. The first phase winding and the second phase winding are wound n times in one direction and the other direction in the circumferential direction of the armature core, and the wave winding portion and the lap winding portion are adjacent slots each time they circulate. Has moved to. When manufacturing the first phase winding and the second phase winding, prepare a plurality of sets of segment conductor sets in which the outer segment conductor and the inner segment conductor form one set, and connect the end portions on the joint side. What is necessary is just to join an edge part after bending.

(B) Wave winding portion The wave winding portion is composed of an outer segment conductor, and connects the first layer conductor and the fourth layer conductor separated from each other by the first pitch W1, and each end of the first layer conductor and the fourth layer conductor. And a pair of joint-side ends that extend from the other ends of the first layer conductor and the fourth layer conductor and are bent away from each other in the circumferential direction. The tips of the pair of joining side end portions of the wave winding portion are opened at approximately two magnetic pole pitches.

(C) Overlap portion The overwrap portion is composed of inner segment conductors, and connects the second layer conductor and the third layer conductor separated from each other by a second pitch, and each end of the second layer conductor and the third layer conductor. And a pair of joint-side end portions that extend from the other ends of the second layer conductor and the third layer conductor and are bent so as to approach each other in the circumferential direction. The second pitch W2 is set to be one slot pitch or more smaller than the magnetic pole pitch Wmp (W2 ≦ Wmp−1), and is set to be two slot pitches smaller than the first pitch (W2 ≦ W1-2). The tip ends of the pair of joining side end portions of the lap winding portion are closed at substantially zero pitch.

(D) Relationship between the two The winding portions of the second phase windings are located inside the wave winding portions of the first respective phase windings, and the first respective phases are located inside the wave winding portions of the second respective phase windings. The winding wrap is located. The first layer conductor of the wave winding part and the second layer conductor of the lap winding part are accommodated in the same or one slot apart, and the fourth layer conductor of the wave winding part and the third layer conductor of the lap winding part are the same. Or it is accommodated in the slot 1 apart.

  In each of the first phase winding and the second phase winding, the tips of the joining side end portions respectively extending from the first layer conductor and the second layer conductor separated by the third pitch W3 are joined to each other, and the fourth pitch W4. The tips of the joining side end portions respectively extending from the separated third layer conductor and fourth layer conductor are joined to each other. The third pitch W3 and the fourth pitch W4 are equal (W3 = W4), and both the third pitch and the fourth pitch are set to be smaller than the magnetic pole pitch Wmp by one slot pitch or more (W3 = W4 ≦ Wmp−1). The second pitch W2 can be equal to or smaller than the third pitch W3 and the fourth pitch W4.

  The clearance between the tip of the U-shaped bent portion of the wave winding portion and the tip of the U-shaped bent portion at the tip of the overlapping winding portion is half the conductor width of the U-shaped bending portion of the wave winding portion and the overlapping winding portion. It is as follows.

  Hereinafter, embodiments in which the present invention is applied to an armature of an AC machine will be described.

<First embodiment>
(overall structure)
A three-phase AC motor (permanent magnet synchronous motor) shown in FIG. 1 includes a housing 10, an armature 30, a rotor 25, and the like. The housing 10 includes a left housing 11 and a right housing 16 each having an open end, and an armature (stator) 30 and a rotor 25 are disposed in the left housing 11, and the right housing 16 covers them. Yes. That is, the rotary shaft 20 is rotatably supported on the end wall of the left housing 11 and the end wall of the right housing 16 via the bearings 12 and 17. A rotor 25 including a rotor core 26 and a plurality of permanent magnets 27 embedded therein is attached to an intermediate portion of the rotating shaft 20, and a load (not shown) is applied to a shaft portion protruding from the left end wall. Is connected.

  The armature 30 has an armature core 32 and an armature winding (three-phase armature winding) 54 inserted in the slot 34, and faces the rotor 25.

(Armature)
Next, the armature will be described in detail with reference to FIGS. As shown in FIGS. 2 and 3, a plurality (54) of slots 34 having a predetermined width and a predetermined depth are formed at a predetermined pitch on the inner peripheral surface of the armature core 32. As shown in FIG. 4, in the armature winding 40, a U-phase winding 40U, a V-phase winding 40V and a W-phase winding 40W constitute a star connection, and the U-phase winding 40U is a first U-phase winding. 90 and a second U-phase winding 100. The same applies to the V-phase winding 40V and the W-phase winding 40W. 5, the segment conductor set 70 shown in FIG. 5 is inserted into a plurality of slots 34 provided in the armature core 32 as shown in FIGS. 2 and 3 from one end surface side through insulating paper 36. The tip ends adjacent to each other in the radial direction on the other end surface are sequentially connected.

(Segment conductor set, placement in slot)
The segment conductor set 70 will be described with reference to FIG. The segment conductor set 70 includes an outer segment conductor 72 and an inner segment conductor 82. The outer segment conductor 72 includes a pair of slot conductor portions 73a and 73b extending in a straight line, a U-shaped bent portion 75 connecting one ends thereof, and a pair of slots conductor portions 73a and 73b extending from the other ends. It has joining side edge parts 77a and 77b.

  As shown in FIG. 5, one slot conductor 73a forms the first layer in the slot 34 of the armature core 32 and is therefore referred to as the first layer conductor, while the other slot conductor 73b similarly forms the fourth layer. Called a four-layer conductor. The joining side end portions 77a and 77b are bent so as to open (separate) from each other in the circumferential direction, and the tips 78a and 78b thereof are joined to the tips of other segment conductors.

  The inner segment conductor 82 includes a pair of slot conductor portions 83a and 83b that extend in a straight line, a U-shaped bent portion 85 that connects one end thereof, and a pair of slot conductor portions 83a and 83b that extend from the other end. It has joining side edge part 87a and 87b. As shown in FIG. 3, one slot conductor portion 83a forms the second layer in the slot 34 of the armature core 32, so it is called a second layer conductor, and the other slot conductor portion 83b also forms the third layer. Called a three-layer conductor. The U-shaped bent portion 85 of the inner segment conductor 82 is surrounded by the U-shaped bent portion 75 of the outer segment conductor 72. The joining side end portions 87a and 87b are bent so as to be closed (approached) in the circumferential direction, and the tips 88a and 88b thereof are joined to the tips of the other segment conductors.

  In addition, what was shown with the broken line in FIG. 5 is a corresponding | compatible part of the outer periphery segment conductor or inner periphery segment conductor not shown.

(Three-phase armature winding)
FIG. 6 shows a development view of the U-phase winding among the three-phase windings formed by joining the segment conductor sets 70. As shown in FIG. The outer segment conductors 72 and the inner segment conductors 82 of the segment conductor set 70 are alternately joined to form the first U-phase winding 90 (see FIG. 7). Also, the inner segment conductor 82 and the outer segment conductor 72 of the segment conductor set 70 are alternately joined to form the second U-phase winding 100 (see FIG. 8).

  As shown in FIG. 3, the first U-phase winding 90 and the second U-phase winding 100 are accommodated in a slot in which the first layer conductor 73a and the second layer conductor 83a are shifted by one slot, and the third layer conductor 83b. The same applies to the fourth layer conductor 73b. Hereinafter, the joined outer circumference segment conductor 72 is referred to as a “wave winding portion”, and the joined inner circumference segment conductor 82 is referred to as a “lap winding portion”.

  3, 6, 7, and 8, the first layer conductor 73 a accommodated in the first layer (innermost in the radial direction) in the slot 34, the half of the U-shaped bent portion 75 connected thereto, and the joining side end The portion 77a is indicated by a broken line. Similarly, the second layer conductor 83a is indicated by a solid line, the third layer conductor 83b is indicated by a one-dot chain line, and the fourth layer conductor 73b is indicated by a two-dot chain line.

  As shown in FIGS. 3 and 5, the first layer conductor 73a of the wave winding portion 72 forms the first layer in the slot (2) of the armature core 32, and the fourth layer conductor 73b is in the slot (12). The fourth layer is formed. The second layer conductor 83a of the lap winding portion 82 forms the second layer in the slot (3), and the third layer conductor 83b forms the third layer in the slot (11).

  As shown in FIGS. 3 and 5, the tip 78a of the wave winding portion (not shown) located on the left side and the tip 88a of the lap winding portion 82 shown in FIG. 3 are joined (welded) to the right side. The tip 78b of the wave winding part (not shown) to be joined and the tip 88b of the lap winding 82 shown in FIG. 3 are joined (welded). As a result, the U-shaped bent portions 75 and 85 constitute the first ring-shaped first coil end 36 on the one end surface 35a side of the armature core 32, and the joining side end portions 77a, 77b, 87a and 87b are formed. A ring-shaped second coil end 37 is configured on the other end surface 35b side as a whole.

(U phase winding)
A U-phase winding 40U shown in FIG. 6 includes a first U-phase winding part 90 shown in FIG. 7 and a second U-phase winding part 100 shown in FIG. Among them, the first U-phase winding portion 90 is configured by alternately joining the wave winding portions 72 and the lap winding portions 82 as shown in FIG. 9, and the joint end pitch and the heavy winding portion of the pair of wave winding portions 72. The sum of the joining end pitches of 82 is equal to the pitch of two magnetic poles (Wa + Wb = 2Wmp = 18).

  The first layer conductor 73a of the wave winding portion 72 forms the first layer of the slot (11), the fourth layer conductor 73b forms the fourth layer of 21 slots (21), and both of them have the first pitch W1 (10 Slot pitch) apart. The distal end 78a of the joining side end 77a and the distal end 78b of the joining side end 77b that are bent away from each other in the circumferential direction are separated from each other by the joining end pitch Wa (18 slot pitch). Here, if the magnetic pole pitch Wmp is 9 slot pitch, the joint end pitch Wa is equal to twice the magnetic pole pitch (18 slot pitch).

  On the other hand, the second layer conductor 83a of the lap winding portion 82 forms the second layer of the slot (3), and the third layer conductor 83b forms the third layer of the slot (11). 8 slots apart). The tip end 88a of the joining side end portion 87a and the tip end 88b of the joining end portion 87b bent so as to approach each other in the circumferential direction are separated from each other by the joining end pitch Wb (zero slot pitch).

  Since the second U-phase winding unit 100 shown in FIG. 8 has the same configuration as the first U-phase winding unit 90, a detailed description thereof is omitted. The wave winding portion of the second U-phase winding 100 is combined with the lap winding portion 82 of the first U-phase winding 90, and the lap winding portion is combined with the wave winding portion 72 of the first U-phase winding 90.

(Coil winding transition)
The number of slots n per phase is 3 (hereinafter referred to as “triple slot”), and the first U-phase winding portion 90 is wound around the armature core 32 three times in the counterclockwise direction. The line part 100 is wound three times clockwise and is connected in series with each other. That is, the first U-phase winding portion 90 is connected to the fourth layer conductor 73b in the 39th slot from the terminal connection line 41U shown in FIG. 7, and is wound around the armature core 32 counterclockwise. A wire 91, a second left-turn winding 92 that is connected to the first left-turn winding 91 at a turn transition portion 94 composed of a 9-slot pitch wave winding portion and travels in the same direction, and a second left turn at the turn-around transition portion 94. A third left winding 93 is connected to the winding 92 and travels in the same direction and has a final end 96. The three left-handed windings 91 to 93 are inserted in slots shifted by one slot pitch.

  As shown in FIG. 8, the second U-phase winding unit 100 starts to wind from the final end 96 of the first U-phase winding unit 90 and is wound around the armature core 32 clockwise. And a second right-turn winding 102 that is connected to the first right-turn winding 101 at the turning transition portion 104 composed of a wave winding portion with a 9-slot pitch and proceeds in the same direction, and a second right-turn winding at the turning transition portion 104. The third right-turn winding 103 is connected to the line 102 and proceeds in the same direction and the end of the winding is connected to the neutral point N. Three left-handed windings 101 to 103 are inserted in slots shifted by one slot pitch.

(Series connection)
A continuous segment conductor is used for electrical connection between the final end 96 of the first U-phase winding portion 90 and the winding start of the second U-phase winding portion 100. Here, the first layer conductor in the 27th slot and the third layer conductor in the 36th slot are connected in series by a deformed segment conductor 107 having a 9-slot pitch (see FIG. 6).

  The V-phase winding (not shown) and the W-phase winding (not shown) have the same configuration as the U-phase winding, and the V-phase winding is a slot shifted from the U-phase winding by 6 slots in the circumferential direction. The W-phase winding is housed in a slot that is further shifted by 6 slots in the circumferential direction from the V-phase winding.

  The first U-phase winding unit 90 and the second U-phase winding unit 100 can be of low voltage (large current) specification as a parallel connection. For this purpose, it is only necessary to connect the final end of the first U-phase winding portion 90 to the neutral point N and change the winding start of the second U-phase winding portion 100 to the terminal connection line 41U.

(effect)
According to the first embodiment, the following effects can be obtained. 1stly, the axial direction dimension of the joining side edge parts 77a, 77b, 87a, and 87b of the segment conductor set 70 can be shortened. Specifically, in FIG. 9, the first layer conductor 73a of the wave winding portion 72 in which the tips 78a and 88a are joined to each other is inserted into the slot (11), and the second layer conductor 83a of the lap winding portion 82 is inserted into the slot (3 ) And are separated by a third pitch W3 (8 slot pitch). Similarly, the third layer conductor 83b of the lap winding portion 82 where the tips 78b and 88b are joined together is inserted into the slot (11), and the fourth layer conductor 73b of the wave winding portion 72 is inserted into the slot (3). Both are separated by a fourth pitch W4 (8 slot pitch).

  Thus, the third pitch W3 and the fourth pitch W4 are equal, and are smaller by one slot pitch than the magnetic pole pitch Wmp (9 slot pitch). Therefore, the axial lengths of the joining side end portions 77a, 77b, 87a and 87b can be shortened and the other end surface 35b of the armature core 32 compared to the case where the third pitch W3 and the fourth pitch W4 are equal to the magnetic pole pitch Wmp. The length of the coil end 37 on the side can be shortened. That is, it is formed by the triangle formed by the pair of joint side end portions 77a and 77b and the other end surface 35b of the armature core 32 and the pair of joint side end portions 87a and 87b and the other end surface 35b of the armature core 32. When considering triangles and similar triangles, the height of the triangle becomes lower as the base of the triangle becomes shorter.

  Second, the axial dimension of the U-shaped bent portion 85 of the lap winding portion 82 located on the inner peripheral side of the segment conductor set 70 can be shortened. That is, as can be seen from FIG. 10, the second pitch W2 (8 slot pitch) between the second layer conductor 83a and the third layer conductor 83b connected by the U-shaped bent portion 85 is the U-shaped bent portion. 75, which is smaller than the first pitch W1 (10 slot pitch) between the first layer conductor 73a and the fourth layer conductor 73b of the wave winding portion 72 connected by 75, and further has a magnetic pole pitch Wmp (9 slot pitch). Is smaller by one slot pitch. Therefore, the protruding length of the U-shaped bent portion 85 can be shortened for the reason described above with respect to the joining side end portions 78a and 78b. If necessary, the tip corner portion 85a of the U-shaped bent portion 85 can be rounded into an arc shape.

  Next, suppression of the protruding length of the U-shaped bent portion 75 of the wave winding portion 72 will be described. The first layer conductor 73a of the wave winding portion 72 is inserted into the 38th slot S38, the fourth layer conductor 73b is inserted into the 48th slot S48, and the first pitch W1 (10 slot pitch) between them is determined by the magnetic pole pitch Wmp. Is also big. Therefore, a gap is likely to be generated between the tip corner portion 75 a of the hook-shaped bent portion 75 and the tip corner portion 85 a of the U-shaped bent portion 85.

  However, by optimizing the bent portion shape such as rounding the tip corner portion 75a of the U-shaped bent portion 75 into an arc shape, the tip corner portion 75a is brought close to the tip corner portion 85a of the U-shaped bent portion 85, and the shaft The increase in directional dimension is suppressed. Specifically, as shown in FIG. 10, the shape of the tip corner portion 75a of the U-shaped bent portion 75 is optimized to form an arc portion 75a1. As a result, the clearance between the U-shaped bent portions 75 and 85 was reduced by Lb to become a clearance Wg. The size of the clearance Wg is about half of the conductor width of the U-shaped bent portion 85. Thus, the protruding length of the coil end 36 can be shortened to the same level as when the first pitch W1 is the magnetic pole pitch.

  Third, this three-phase winding has the effect of 8/9 short-pitch winding (short-pitch coefficient kp = 0.984) and the effect of triple slot distributed winding (distributed winding coefficient kd = 0.96). (Winding coefficient k = kp · kd = 0.945) and also has the effect of reducing harmonic electromotive force.

<Second embodiment>
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, in order to further shorten the protruding length of the U-shaped bent portion, the first pitch W1 is selected to be the same as the magnetic pole pitch (Wmp), and the second pitch W2 is set to the third pitch W3 and the fourth pitch. It is selected smaller than the pitch W4. In the following, the description will focus on the differences from the first embodiment.

(Three-phase armature winding)
FIG. 11 shows a developed view of the U-phase winding 40U among the three-phase windings formed by joining the segment conductor sets 70 (see FIG. 5). U-phase winding 40U includes first U-phase winding portion 150 shown in FIG. 12 and second U-phase winding portion 160 shown in FIG. The outer segment conductor 72 and the inner segment conductor 82 of the segment conductor set 70 are alternately joined to form the first U-phase winding 150. In addition, the inner segment conductor 72 and the outer segment conductor 82 of the segment conductor set 70 are alternately joined to form the second U-phase winding 160. The first U-phase winding portion 150 and the second U-phase winding portion 160 are accommodated in a slot in which the first layer conductor 73a and the second layer conductor 83a are shifted by one slot, and the third layer conductor 83b and the fourth layer conductor The same applies to the conductor 73b.

  As shown in FIG. 12, in the first U-phase winding 150, the first layer conductor 73a of the wave winding portion 72 forms the first layer in the slot (11) of the armature core 32, and the fourth layer conductor 73b is the slot. The fourth layer is formed in (20). The second layer conductor 83a of the lap winding portion 82 forms the second layer in the slot (3), and the third layer conductor 83b forms the third layer in the slot (10). As described in the first embodiment (FIGS. 3 and 5), the tip 78a of the joining side end 77a of the wave winding portion 72 and the tip 88a of the joining side end 87a of the lap winding portion 82 are joined. The tip 78b of the joining side end 77b of the wave winding part 72 and the tip 88b of the joining side end 87b of the lap winding part 82 are joined. Since the second U-phase winding 160 shown in FIG. 13 has the same configuration as the first U-phase winding 150, a detailed description thereof is omitted.

(U phase winding)
As can be seen from FIG. 14 showing the main part (one pole pair), the first U-phase winding part 150 of the U-phase winding is configured by alternately joining the wave winding part 72 and the lap winding part 82, The sum of the joining end pitch Wa of the pair of wave winding portions 72 and the joining end pitch Wb of the lap winding portion 82 is equal to the two magnetic pole pitch (Wa + Wb = 2Wmp = 18).

  The first layer conductor 73a of the wave winding portion 72 forms the first layer of the slot (11), the fourth layer conductor 73b forms the fourth layer of the slot (20), and both of them have the first pitch W1 (9 slots). The pitch is far away. The tip end 78a of the joining side end portion 77a and the tip end 78b of the joining side end portion 77b that move away in the circumferential direction are separated from each other by the joining end pitch Wa (17 slot pitch). When the magnetic pole pitch Wmp is 9 slot pitch, the joint end pitch Wa is one slot less than twice the 2 magnetic pole pitch (18 slot pitch).

  On the other hand, the second layer conductor 83a of the lap winding portion 82 forms the second layer of the slot (3), and the third layer conductor 83b forms the third layer of the slot (10). 7 slots apart). The front end 88a of the joining side end 87a and the front end 88b of the joining end 87b that are bent so as to approach each other in the circumferential direction are separated from each other by a joining end pitch Wb (one slot pitch). The second U-phase winding unit 160 has the same configuration as that of the first U-phase winding unit 150, and thus the description thereof is omitted.

(Coil winding transition)
Since the slot is three times (n = 3), the first U-phase winding portion 150 is wound three times around the armature core 32, and the second U-phase winding portion 160 is wound three times in the opposite direction to each other in series. It is connected. That is, in FIG. 12, the first U-phase winding section 150 includes a first left-handed winding 151 having a U-phase terminal 151a and wound around the armature core 32 counterclockwise, and an 8-slot pitch wave winding section. The second left turn winding 152 connected to the first left turn winding 151 and traveling in the same direction at the turn transition portion 154 and the second left turn winding 152 connected at the turn transition portion 154 and proceeding in the same direction. And a third left-handed winding 153 having a final end 153a.

  As shown in FIG. 13, the second U-phase winding portion 160 includes a first right-hand winding 161 wound clockwise around the armature core 32 and a winding transition portion 164 including a wave winding portion with an 8-slot pitch. The second right-turn winding 162 connected to the first right-turn winding 161 and progressing in the same direction, and the second transitional portion 162 connected to the second right-turn winding 162 in the same direction and progressing in the same direction, the end of the winding being And a third right-turn winding 163 connected to the sex point N.

(Series connection)
The final end 153a of the first U-phase winding part 150 and the winding start 161a of the second U-phase winding part 160 are the first layer conductor 73a in the 27th slot and the third layer conductor 83b in the 35th slot. Are connected in series by deformed segment conductors 167 having an 8-slot pitch. As described in the first embodiment, the first U-phase winding portion 150 and the second U-phase winding portion 160 may be connected in parallel.

(effect)
According to the second embodiment, in addition to the effects of the first embodiment, the protruding length of the U-shaped bent portion 85 of the lap winding portion 82 and the protruding length of the U-shaped bent portion 75 of the wave winding portion 72 are set. It can be further shortened. That is, as can be seen from FIG. 15, the slot (39) in which the second layer conductor 83a of the wrapping portion 82 is inserted is separated from the slot (46) in which the third layer conductor 83b is inserted by 7 slots. This is 2 slots smaller than the pole pitch. Since the distance between the second layer conductor 83a and the third layer conductor 83b is short, the protruding length of the U-shaped bent portion 85 can be reduced.

  Further, the slot (38) in which the first layer conductor 73a of the wave winding portion 72 is inserted is separated from the slot (47) in which the fourth layer conductor 73b is inserted by 9 slots, which is equal to the magnetic pole pitch. . Therefore, the protruding length of the U-shaped bent portion 75 can be reduced as compared with the case where the pitch is larger than the magnetic pole pitch. And if the front-end corner | angular part 75a of the U-shaped bending part 75 is rounded off and it is set as the circular arc part 75a1, protrusion length can be suppressed. As a result, the protruding length of the coil end 36 can be shortened to a level where the first pitch W1 is smaller than the magnetic pole pitch.

  Further, the U-phase winding 40 has an effect of 7.5 / 9 short winding (short winding coefficient kp = 0.97, which corresponds to 5/6 short winding), and triple slot distribution winding. (Distributed winding coefficient kd = 0.96) has an effect (winding coefficient k = kp · kd = 0.93), and also has the effect of reducing the harmonic electromotive force and suppressing the torque ripple of the motor. .

It is an axial sectional view of the 1st example of the present invention. It is a conductor arrangement | positioning figure in the slot in the armature core of 1st Example. It is a principal part enlarged view of the U-phase winding figure of the same armature. It is a connection diagram which similarly shows the relationship of each phase winding. It is a perspective view of a segment conductor set similarly. It is a U phase winding figure of an armature similarly. It is the 1st U phase winding figure of an armature similarly. It is the 2nd U phase winding figure of an armature similarly. It is a main part winding diagram of an armature similarly. It is a schematic diagram of an armature winding similarly. It is a U phase winding figure of the armature of the 2nd example. It is the 1st U phase winding figure of an armature similarly. It is the 2nd U phase winding figure of an armature similarly. It is a main part winding diagram of an armature similarly. It is a schematic diagram of an armature winding similarly.

Explanation of symbols

25: Rotor 30: Armature (stator)
32: Armature core 34: Slot 40: Armature winding 40U: U-phase winding 70: Segment conductor set 72: Wave winding portion 73a: First layer conductor 73b: Fourth layer conductor 75: U-shaped bent portion 77a , 77b: Joining side ends 78a, 78b: tip 82: lap winding portion 83a: second layer conductor 83b: third layer conductor 90: first U phase winding 100: second U phase winding

Claims (7)

Armature core (32) having n (n = 2, 3,...) Slots (34) per pole and phase, and a first layer conductor housed in the slots in order from the radially inner side to the outer side (73a), a second layer conductor (83a), a third layer conductor (83b) and an armature winding (40) composed of a multiphase winding having a fourth layer conductor (73b), and each phase The first phase winding (90) and the second phase winding (100) constituting the winding (40U, 40V and 40W) are connected in series or in parallel, and the first phase winding and the second Each phase winding includes a plurality of wave winding portions (72) and a plurality of overlapping winding portions (82) alternately arranged in the circumferential direction,
The wave winding portion includes the first layer conductor and the fourth layer conductor separated from each other by a first pitch, a U-shaped bent portion (75) connecting each end of the first layer conductor and the fourth layer conductor, A pair of joint-side ends (77a and 77b) extending from the other ends of the first layer conductor and the fourth layer conductor and bent away from each other in the circumferential direction, and the lap winding portions are separated from each other by a second pitch. Each of the second layer conductor and the third layer conductor, a U-shaped bent portion (85) connecting each end of the second layer conductor and the third layer conductor, and each of the second layer conductor and the third layer conductor Including a pair of joint side end portions (87a and 87b) extending from the other end and bent so as to approach in the circumferential direction,
The tips (78a, 88a) of the joining side end portions respectively extending from the first layer conductor and the second layer conductor separated from each other by a third pitch are joined together, and the third layer conductor and the fourth layer separated from each other by a fourth pitch A segment conductor type armature in which tips (88b, 78b) extending from the fourth layer conductor are joined to each other,
The first phase winding and the second phase winding are wound n times in opposite directions in the circumferential direction of the armature core, and the wave winding portion and the lap winding portion are wound around the armature core. Each time it goes around, it is shifted to an adjacent slot, and the tips of the pair of joint-side end portions of the wave winding portion are opened at approximately two magnetic pole pitches, and the tips of the pair of joint-side end portions of the lap winding portion Is closed to a substantially zero pitch, and the third pitch and the fourth pitch are set to be equal and smaller than the magnetic pole pitch by one slot pitch or more.   The segment conductor type armature according to claim 1, wherein the second pitch is set to be smaller than the magnetic pole pitch by one slot pitch or more.   The segment conductor type armature according to claim 1, wherein the second pitch is set to be smaller than the first pitch by two slot pitches or more.   The segment conductor type armature according to any one of claims 1 to 3, wherein the first pitch is set to be equal to or less than a magnetic pole pitch.   The clearance between the tip of the U-shaped bent portion of the wave winding portion and the tip of the U-shaped bent portion of the lap winding portion is the conductor width of the U-shaped bending portion of the wave winding portion and the lap winding portion. The segment conductor type armature according to any one of claims 1 to 4, wherein the segment conductor type armature is less than or equal to one half.   The lap winding portion of the second phase winding is positioned inside the wave winding portion of the first phase winding, and the first phase winding is positioned inside the wave winding portion of the second phase winding. The segment conductor type armature according to claim 1, wherein the overlapping winding portion is located.   The first phase winding and the second phase winding are accommodated in a slot in which the first layer conductor of the wave winding portion and the second layer conductor of the lap winding portion are the same or separated from each other, The segment conductor type armature according to claim 1, wherein the fourth layer conductor of the wave winding portion and the third layer conductor of the lap winding portion are accommodated in the same or one separated slot.

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