JP4375304B2 - Segment conductor type armature - Google Patents

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

  In a vehicle type with a large capacity of a power source (battery) for driving an AC motor, the battery voltage is increased to reduce various losses. On the other hand, considering the cost, it is desirable to reduce the number of battery cells and suppress the voltage. Thus, it is desirable that the in-vehicle AC motor can cope with both a relatively high voltage and a low voltage of the battery.

  On the other hand, for example, an auxiliary motor mounted on an engine is desired to be further downsized in order to improve mountability. However, the conventional segment conductor type armature has difficulty in adapting to different voltages of the power source due to restrictions on the winding for joining the joint side end of the segment conductor, and the axial direction of the joint side end There was a limit to shortening the protrusion length.

  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, the number of turns (the number of series conductors for each pole and phase) is selected with a fine step size and the power source is selected. It is an object of the present invention to provide a segment conductor type armature that can be applied to different voltages and can shorten the axial length of the armature winding.

  The inventor of the present application has conceived that the number N of slots for each pole and phase is not an integer, but a fraction that can be made between an integer and an integer, and has completed the present invention.

The segment conductor type armature according to the present invention, as described in claim 1, includes an armature core having N slots for each pole and phase, and a first accommodated in the slots in order from the radially inner side to the outer side. The first and second phase windings and the first and second phase windings, each of which comprises a multi-phase winding having a layer conductor, a second layer conductor, a third layer conductor, and a fourth layer conductor. 2 Each phase winding includes a plurality of wave winding portions and a plurality of overlapping winding portions that are connected in series and are alternately arranged in the circumferential direction.

  The wave winding section includes a first layer conductor and a fourth layer conductor that are separated from each other by a first pitch, a U-shaped bent portion that connects each end of the first layer conductor and the fourth layer conductor, a first layer conductor, and a fourth layer conductor. A pair of joint-side ends that extend from each other end of the 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, a U-shaped bent portion connecting each end of the second layer conductor and the third layer conductor, a second layer conductor and a third layer conductor. A pair of joint-side ends extending from each other end of the layer conductor and bent so as to approach in the circumferential direction.

  The ends of the joining side end portions extending from the first layer conductor and the second layer conductor separated from each other by the third pitch are joined to each other, and respectively extended from the third layer conductor and the fourth layer conductor separated from each other by the fourth pitch. The tips are joined together. The third pitch W3 and the fourth pitch W4 are equal and smaller than the magnetic pole pitch Wmp (W3 = W4 <Wmp).

  According to the segment conductor type armature of the present invention, the number N of slots per phase per pole is not an integer, but a fraction that can be an intermediate between an integer and an integer, so the number of turns (the number of series conductors per phase per pole) ) Can be selected in small increments, and can be applied to different voltages of the power supply. Further, since the pitch W3 between the first layer conductor and the second layer conductor joined at the tips and the pitch W4 between the third layer conductor and the fourth layer conductor are both set smaller than the magnetic pole pitch Wmp, The pitch can be made shorter than that of the full-pitch winding, and the protruding length of the joining side end can be reduced accordingly. As a result, the entire axial length of the armature winding can be shortened, and the efficiency is improved by reducing the resistance.

Furthermore , by setting the number of windings around the armature core of the first phase winding and the second phase winding to n and n + 1, the number of slots per pole per phase is N = n + 1 / Two (n = 1, 2,...) Fractional slots can be realized without significant change from the integer slots, and an intermediate number of turns can be set for the integer slots. Further, the third pitch and the fourth pitch, which are the joint-side slot pitch, can be made at least 1/2 slot pitch smaller than the magnetic pole pitch, and the protruding length of the joint-side end can be shortened.

According to the conductor segments type armature of claim 2, the first phase winding of the armature core, and the winding number of turns of the second phase windings n circumference, and n ± 1/2 round By making it equivalent, a fractional slot with N = n ± 1/4 slots (n = 1, 2,...) Per pole per phase can be realized without significant change from an integer slot. The degree of freedom is improved. Moreover, it is applicable to the number of poles 8, 12, and 16. The third pitch and the fourth pitch can be made at least 1/4 slot pitch smaller than the magnetic pole pitch, and the protruding length of the joining side end can be shortened.

According to the segment conductor type armature of claim 3 , by setting the number of windings around the armature core of the first and second phase windings to be equivalent to n ± k / m, The number of slots per pole is N = n ± k / m (n = 1, 2,...; M = 3, 5, 7; k is an integer less than m / 2), and the number of slots is 6, 10 and 14 are applicable. In addition, the third pitch and the fourth pitch can be at least j / m (j is an integer less than m) slot pitch smaller than the magnetic pole pitch, and the protruding length of the joining side end can be shortened.

According to the segment conductor type armatures of the fourth and fifth 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 sixth aspect , the axial protruding length of the U-shaped bent portion of the wave winding portion can be shortened. According to the segment conductor type armature of the seventh aspect , 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 shortened.

(A) Overall The segment conductor type armature of the present invention comprises an armature core and an armature winding. The armature winding is formed by inserting a U-shaped (pine needle shape) segment conductor into a slot of an armature core and joining the free end (joint end) thereof. The number of slots N for each pole and phase of the armature core is a fraction. In the case of typical N = n + 1/2 (n = 1, 2,...), The number of slots N is 3/2, 5/2, ... The number of straight portions (conductor portions) of the segment conductors accommodated in each slot is four, one set (4) or two sets (8). Moreover, there is no restriction | limiting in the number of poles, and it can be made into 4 poles, 6 poles, 8 poles, 10 poles. When the number of straight portions per slot is four, the number of turns is 10 if the number of slots per pole is 2.5, and 14 if it is 3.5. When the number of straight portions per slot is 8, the number of turns is 20 if the number of slots per pole is 2.5, and 28 if it is 3.5.

  The armature winding is composed of a multi-phase (for example, three-phase) winding, and each phase winding includes a first phase winding and a second phase winding connected in series. 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 and (n + 1) times in opposite directions in the circumferential direction of the armature core, and each time the wave winding portion and the lap winding portion circulate. Transition to adjacent slot. For example, when n is 1, it makes one turn in one direction and two turns in the other direction, and when n is 2, it makes two turns in one direction and three turns in the other direction. At the time of manufacture, a segment conductor set is prepared in which the outer peripheral segment conductor and the inner peripheral segment conductor are combined into one set.

(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 joining 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 at least 1/2 slot pitch smaller than the magnetic pole pitch Wmp (W2 ≦ Wmp−1 / 2), and is set at least 1 slot pitch smaller than the first pitch W1 (W2 ≦ W1-1). 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 one wave winding portion and the second layer conductor of the other overlapping winding portion of the first phase winding and the second phase winding are accommodated in the same or one separated slot, and the first The fourth layer conductor of one wave winding part and the third layer conductor of the other overlapping winding part of each phase winding and second each phase winding are accommodated in the same or one slot 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, which are separated from each other by the third pitch, are joined to each other, and the fourth pitch is obtained. 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 the third pitch and the fourth pitch are both set at least 1/2 slot pitch smaller than the magnetic pole pitch Wmp (W3 = W4 ≦ Wmp−1 / 2). Has been. The second pitch W2 can be selected to be equal to or smaller than the third pitch W3 and the fourth pitch W4.

  The size of 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 U-shape of the U-shaped bending portion of the wave winding portion and the lap winding portion. It is less than half the conductor width of the bent part.

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

<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. An armature 30 and a rotor 25 are disposed in the left housing 11, and the right housing 16 covers them. 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) 40 inserted into 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 of (45) 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. 3, one slot conductor portion 73a forms a first layer in the slot 34 of the armature core 32 and is therefore referred to as a “first layer conductor”, while the other slot conductor portion 73b similarly has a fourth layer. This is referred to as a “fourth 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. On the other hand, as shown in FIG. 3, the slot conductor portion 83a forms the second layer in the slot 34 of the armature core 32, and is therefore referred to as a “second layer conductor”, while the slot conductor portion 83b similarly has the third layer. This is called “third 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, in the first U-phase winding and the second U-phase winding, the first layer conductor 73a and the second layer conductor 83a are accommodated in the same slot or a slot 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 (10). 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 (10).

  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 portion (not shown) and the tip 88b of the lap winding portion 82 shown in FIG. 3 are joined (welded). As a result, the U-shaped bent portions 75 and 85 constitute a ring-shaped coil end 38 as a whole on the one end surface 35a side of the armature core 32, and the joining side end portions 77a, 77b, 87a and 87b are the other end surface 35b. A ring-shaped coil end 37 is formed on the entire side.

(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 overlapping winding portions 82 as shown in FIG. 9, and the joint end pitch Wa and the heavy winding of the pair of wave winding portions 72. The sum of the joining end pitch Wb of the portion 82 is equal to the two magnetic pole pitch (Wa + Wb = 2Wmp = 15).

  The first layer conductor 73a of the wave winding portion 72 forms the first layer of the slot (10), the fourth layer conductor 73b forms the fourth layer of the slot (18), and both of them have the first pitch W1 (8 slots). The pitch is far away. 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 (15 slot pitch). Here, if the magnetic pole pitch Wmp is 7.5 slot pitch, the joint end pitch Wa is equal to twice the magnetic pole pitch (15 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 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 N of slots per phase per pole is 2.5, and is hereinafter referred to as “2.5 times slot”. In order to realize the 2.5 times slot, the first U-phase winding part 90 is wound around the armature core 32 three times counterclockwise, and the second U-phase winding part 100 is wound twice around the clockwise direction, They are connected in series with each other. Considering the number of slots for each pole and phase, since the first U-phase winding is N1 = 2 and the second U-phase winding is N2 = 3, the U-phase winding is N = 2.5 (both As an average value).

  That is, the first U-phase winding portion 90 is connected to the fourth layer conductor 73b in the 33rd 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 connected to the first left-turn winding 91 at the turn transition portion 94 composed of a 7-slot pitch wave winding portion and proceeding in the same direction, and a second left-turn winding 92 at the turn 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 the second right-turn winding connected to the first right-turn winding 101 at the turn transition portion 104 composed of the 8-slot pitch wave winding portion and proceeding in the same direction, the end of the turn being connected to the neutral point N 102. The two left-handed windings 101 and 102 are inserted in slots shifted by one slot pitch.

(Series connection, relationship between number of slots and windings)
The electrical connection between the final end 96 of the first U-phase winding portion 90 and the start of winding of the second U-phase winding portion 100 is preferably a continuous segment conductor. Here, as shown in FIG. 6, the first layer conductor in the 23rd slot and the third layer conductor in the 31st slot are connected in series by the deformed segment conductor 107 having an 8-slot pitch.

  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 by 5 slots in the circumferential direction from the U-phase winding. The W-phase winding is housed in a slot shifted further by 5 slots in the circumferential direction from the V-phase winding.

(effect)
According to the first embodiment, the following effects can be obtained. First, an intermediate number of turns can be realized for an integer slot, and the degree of freedom in selecting the number of turns is improved. Specifically, when the number of conductors in each slot 34 of the armature core 32 is 4, the number of turns 10 between the number of turns 8 and 12 can be realized, and when the number of turns 8 is too small, the number of turns 12 Then, it can respond to the power supply voltage which is too large. This is possible because the number of slots of each pole / phase of the armature core 32 is not an integer such as 2, 3, but a fraction (2.5).

  Secondly, the axial dimensions of the joining side end portions 77a, 77b, 87a and 87b of the segment conductor set 70 can be shortened. In detail, 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 tenth slot, and the second layer conductor 83a of the lap winding portion 82 is inserted into the third slot. Inserted, both are separated by a third pitch W3 (7 slot pitch). Similarly, the third layer conductor 83b of the lap winding portion 82 where the tips 78b and 88b are joined to each other is inserted into the tenth slot, and the fourth layer conductor 73b of the wave winding portion is inserted into the third slot. The fourth pitch W4 (7 slot pitch) is separated.

  The third pitch W3 and the fourth pitch W4 are equal and smaller than the magnetic pole pitch Wmp by 0.5 slot pitch. Therefore, compared with the case where W3 and W4 are equal to Wmp, the axial lengths of the joining side end portions 77a, 77b, 87a and 87b can be shortened, and the length of the coil end 37 on the other end surface 35b side of the armature core 32 can be reduced. Can be shortened. That is, in FIG. 3, a triangle formed by the pair of joint side end portions 77 a and 77 b and the other end surface 35 b of the armature core 32, and the pair of joint side end portions 87 a and 87 b and the other end surface 35 b of the armature core 32 When the triangle formed by (1) and a triangle similar to these are considered, the height becomes lower if the base of the triangle becomes shorter.

  Third, the axial dimension of the U-shaped bent portion 85 of the lap winding portion 82 can be shortened. That is, as can be seen from FIG. 10, the second pitch W <b> 2 between the second layer conductor 83 a and the third layer conductor 83 b connected by the U-shaped bent portion 85 is connected by the U-shaped bent portion 75. It is smaller than the first pitch W1 between the first layer conductor 73a and the fourth layer conductor 73b by 1 slot pitch, and is smaller than the magnetic pole pitch Wmp by 0.5 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 will be described. The first layer conductor 73a connected by the U-shaped bent portion 75 is inserted into the 32nd (S32 in FIG. 10) slot, and the fourth layer conductor 73b is inserted into the 40th (S40) slot. W1 is slightly larger than the magnetic pole pitch Wmp. Therefore, a gap may be generated between the tip corner portion 75a of the U-shaped bent portion 75 and the tip corner portion 85a 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, and the clearance Wg was about half the conductor width of the U-shaped bent portions 85 and 75. Thus, the protruding length of the coil end 38 can be shortened to the same level as when the first pitch W1 is the magnetic pole pitch.

<Second embodiment>
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the first pitch W1 is made smaller than the magnetic pole pitch (Wmp) by 1/2 slot pitch in order to further shorten the protruding length of the U-shaped bent portion compared to the first embodiment. ing. In the following, the description will focus on the differences from the first embodiment.

(Three-phase armature winding)
A U-phase winding 40U shown in FIG. 11 includes a first U-phase winding portion 150 shown in FIG. 12 and a second U-phase winding portion 160 shown in FIG. Outer segment conductor 72 and inner segment conductor 82 of segment conductor set 70 are alternately joined to form first U-phase winding 150. Further, 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 160. In the first U-phase winding portion and the second U-phase winding portion, the first layer conductor 73a and the second layer conductor 83a are accommodated in the same slot or a slot shifted by one slot, and the third layer conductor 83b and the fourth layer conductor 83a The same applies to the layer 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 (10) of the armature core 32, and the fourth layer conductor 73b is the slot. The fourth layer is formed in (17). 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 (9).

  In the same manner as described in the first embodiment (FIGS. 3 and 5), the tip of the joining side end 77a of the wave winding portion 72 and the tip of the joining side end portion 87a of the lap winding portion 82 are joined. The tip of the joining side end 77b of the winding part 82 and the tip 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), among the U-phase windings, the first U-phase winding 150 is configured by alternately joining the wave winding portions 72 and the lap winding portions 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 = 15).

  The first layer conductor 73a of the wave winding portion 72 forms the first layer of the slot (10), the fourth layer conductor 73b forms the fourth layer of the slot (17), and both of them have the first pitch W1 (7 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 which are separated in the circumferential direction are separated from each other by the joining end pitch Wa (14 slot pitch). Here, if the magnetic pole pitch Wmp is 7.5 slot pitch, the joint end pitch Wa is one slot less than twice the magnetic pole pitch (15 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), the third layer conductor 83b forms the third layer of the slot (9), and both of them have the second pitch W2 ( 6 slots pitch) 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 will not be described.

(Coil winding transition)
In order to realize a 2.5 times slot (N = 2.5), the armature core 32 is wound around the first U-phase winding part 150 three times counterclockwise and the second U-phase winding part 160 clockwise. Are wound twice and connected in series with each other. That is, in FIG. 12, the first U-phase winding section 150 includes a first left-handed winding 151 having a U-phase terminal connection line 151a and wound around the armature core 32 counterclockwise, and a 6-slot pitch wave winding. The second left-handed winding 152 connected to the first left-handed winding 151 at the turning transition portion 154 and proceeding in the same direction, and the second left-turning winding 152 connected at the turning transition portion 154 in the same direction. It comprises a third left-handed winding 153 that travels and has a final end 153a.

  As shown in FIG. 13, the second U-phase winding section 160 includes a first right-hand winding 161 wound clockwise around the armature core 32 and a winding transition section 164 including a seven-slot pitch wave winding section. The second right-turn winding 162 is connected to the first right-turn winding 161 and proceeds in the same direction, and the end of the turn is connected to the neutral point N.

(Series connection)
The final end 153a of the first U-phase winding portion 150 and the winding start 161a of the second U-phase winding portion 160 are the first layer conductor 73a in the slot (23) and the third layer conductor 83b in the slot (30). Are connected in series by a deformed segment conductor 167 having a 7-slot pitch.

(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 provided. Can be further shortened. That is, as can be seen from FIG. 15, the slot (33) in which the second layer conductor 83a of the wrapping portion 82 is inserted is separated from the slot (39) in which the third layer conductor 83b is inserted by 6 slots, This is 1.5 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. In addition, the front end corner portion 85a of the U-shaped bent portion 85 is rounded to have an arc shape.

  Further, the slot (32) in which the first layer conductor 73a of the wave winding portion 72 is inserted is separated from the slot (39) in which the fourth layer conductor 73b is inserted by 7 slots, which is 0. It is small by 5 slots. 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. Moreover, if the tip corner portion 75a of the U-shaped bent portion 75 is rounded to form the arc portion 75a1, the clearance Wg between 75a and 85a is reduced by Lb, and the protruding length of the U-shaped bent portion can be suppressed.

<Third embodiment>
A third embodiment of the present invention will be described with reference to FIGS. 17 and 18 are partially enlarged views of FIG. 16, FIGS. 20 and 21 are partially enlarged views of FIG. 19, and FIGS. 23 and 24 are partially enlarged views of FIG. In the first embodiment, the number of windings around the armature core of the first phase winding and the second phase winding is n and n + 1, so that the number of slots per phase per pole can be increased. N = n + 1/2 (n = 1, 2,...) Fractional slot windings. On the other hand, in the third embodiment, the number of windings around the armature core of the first phase winding and the second phase winding is equivalent to n and n ± 1/2. Therefore, the number of slots per pole per phase is a fractional slot winding with N = n ± 1/4 (n = 1, 2,...), Which is an intermediate number of turns that can be realized in the first embodiment. The number of turns can be selected, and this is applicable when the number of pole pairs is an even number (8, 12, 16 poles). The following description will focus on the differences from the first embodiment, taking the case of 8 poles and N = 2−1 / 4 (1.75 times slot) as an example.

(Three-phase armature winding)
Hereinafter, the U-phase winding will be described as a representative of the three-phase winding. A U-phase winding 40U shown in FIGS. 16 to 18 includes a first U-phase winding part 170 shown in FIGS. 19 to 21 and a second U-phase winding part 180 shown in FIGS. The first U-phase winding 170 and the second U-phase winding 180 are formed by alternately joining the outer segment conductor 72 (wave winding portion) and the inner segment conductor 82 (overlapping winding portion) of the segment conductor set 70. Has been.

(Fractional slot)
In order to realize a 1.75 times slot (N = 2−1 / 4), the first U-phase winding part 170 is wound around the armature core 32 twice in a counterclockwise direction, and the second U-phase winding part 180 is It is wound 1.5 turns clockwise and connected in series with each other.

  Considering the number N of slots for each pole and phase, since the first U-phase winding portion is N1 = 2 and the second U-phase winding portion is N2 = 1.5, the U-phase winding has N = 1. It functions as 75 (average value of both).

  As shown in FIGS. 19 to 21, the first U-phase winding portion 170 includes a first left-handed winding 172 having a U-phase connecting wire 171 and wound around the armature core 32 counterclockwise. It is composed of a second left-handed winding 173 which is connected by a winding transition portion 174 composed of a four-slot pitch overlapping winding portion and proceeds in the same direction and has a final end 175. Thereby, the number of slots for each pole and each phase of the first U-phase winding portion is N1 = 2.

  As shown in FIGS. 22 to 24, the second U-phase winding portion 180 is a first right-hand winding wound around the armature core 32 clockwise from the winding start 181 located at the same position as the final end 175. 182 and a second right-turn winding 183 connected to this by a turn transition portion 184 consisting of a wave winding portion with a 5-slot pitch and proceeding in the same direction, with the end of the turn connected to a neutral point N Is done. Here, the second right-hand winding 183 jumps between the poles by the connection line 188 and is wound only in the half pole slots, and the number of slots N2 for each pole and each phase of the second U-phase winding part is N2 = 1 + 1/2 = 1.5.

(Connection line)
As shown in FIGS. 22 to 24, the second right-hand winding 183 includes a protrusion 186 extending from the top of the U-shaped bent portion connected to the fourth layer conductor 73b in the slot (18), and a slot ( 2) It has a connecting line 188 that is joined by a protruding portion 187 extending from the top of the U-shaped bent portion that is connected to the first layer conductor 73a, and that short-circuits between 186 and 187. The overlapping winding portion 82 below the connection line is only the first right-hand winding (one coil wound in the slot (7) and the slot (12)). At the 180 ° symmetrical position, instead of the connection line, the winding end 189 connected to the neutral point N is placed in front of the winding start 181, so that the lap winding portion 82 becomes the first right-hand winding (slot (28)-(33 ) Is only one coil). As described above, the second right-hand winding 183 is wound only in the half pole slot by the inter-pole jumping means such as the connection line 188, and N2 = 1 + 1/2 = 1 in the entire second U-phase winding section. .5.

(Series connection)
The final end 175 of the first U-phase winding portion 170 and the winding start 181 of the second U-phase winding portion 180 are connected to the first layer conductor 73a in the slot (22) as shown in FIGS. 28) is connected in series with a deformed segment conductor 176 having a 6-slot pitch connecting the third layer conductor 83b in the inner layer.

(Joint slot pitch)
The third pitch W3 and the fourth pitch W4, which are the joint side slot pitches, are 17-12 = 5 slot pitches between the slot (17) and the slot (12) in FIG. It is. In FIG. 24, between slot (12) and slot (7), 12-7 = 5 slot pitch, and all others are 5 slot pitches. In this way, the third pitch and the fourth pitch, which are the joint-side slot pitches, are both equal to 5 slot pitches and smaller than the magnetic pole pitch 5.25.

(Slot pitch of lap winding part)
The second pitch W2 of the lap winding portion 82 is 17-12 = 5 slot pitch between the slot (17) -slot (12) in FIG. 21, and the other is the same as the 5-slot pitch (the loop transition portion 174). Only 4 slot pitch). In FIG. 24, between slot (12) and slot (7), 12-7 = 5 slot pitch, and all others are 5 slot pitches. Thus, the second pitch W2 of the lap winding portion 82 is a 5-slot pitch, which is smaller than the magnetic pole pitch 5.25.

(Slot pitch of wave winding part)
The first pitch W1 of the wave winding portion 72 is a 5-slot pitch at 72a (slot Nos. 23-18, 22-17, 2-39, 1-38) in FIGS. (Slot Nos. 34-28, 33-27, 13-7, and 12-6) are 6 slot pitches. Further, in FIGS. 22 to 24, the location of 72a is a 5-slot pitch, and the location of 72b (slot No. 7-1) is a 6-slot pitch. As described above, the first pitch W1 of the wave winding portion 72 is 6 slot pitch in 72b, but the second pitch W2 of the overlapping winding portion 82 to be combined inside is 5 slot pitch. By optimizing the shape of the U-shaped bent portion 75 of the winding portion 72, the protruding length in the axial direction can be suppressed. The case of 8 poles has been described above, but the same configuration can be applied to the case where the number of pole pairs is an even number such as 12, 16 poles.

(effect)
According to the third embodiment described above, since the number of slots per phase per pole is N = n ± 1/4 (n = 1, 2,...), The number of pole pairs is an even number (8, 12, 16). In the case of pole), an intermediate value of the number of turns that can be realized in the first embodiment can be selected, and the degree of freedom of the number of turns is improved. When the number of conductors in each slot 34 of the armature core 32 is 4, the first and third embodiments are combined, and when N is swung from 1.5 to 3.5 in 1/4 increments, the number of turns is 6, 7 , 8, ... 12, 13, 14 and can be set for each turn. Further, the third pitch and the fourth pitch, which are the joint side slot pitch, are 5, which can be made 1/4 slot pitch smaller than the magnetic pole pitch 5.25, and accordingly the protruding length of the joint side end can be shortened. Further, the second pitch W2 of the lap winding portion 82 on the U-shaped bending side is a 5-slot pitch, which is smaller than the magnetic pole pitch 5.25, and the axial protruding length on the bending side can be shortened.

<Fourth embodiment>
A fourth embodiment of the present invention will be described with reference to FIGS. 26 and 27 are enlarged views of a partial division of FIG. 25, FIGS. 29 and 30 are enlarged views of a partial division of FIG. 28, and FIGS. 32 and 33 are enlarged views of a partial division of FIG. In this fourth embodiment, the number of windings around the armature core of each of the first and second phase windings is equivalent to n ± k / m, so that the number of slots per pole per phase Is a fractional slot winding with N = n ± k / m (n = 1, 2,...; M = 3, 5, 7; k is an integer less than m / 2), and the number of pole pairs is odd ( 6, 10 and 14 poles). The following description will focus on differences from the first embodiment, taking the case of 10 poles and N = 2−1 / 5 (1.8 times slot) as an example.

(Three-phase armature winding)
Hereinafter, the U-phase winding will be described as a representative of the three-phase winding. The U-phase winding 40U shown in FIGS. 25 to 27 includes a first U-phase winding part 190 shown in FIGS. 28 to 30 and a second U-phase winding part 200 shown in FIGS. 31 to 33. Outer segment conductors 72 (wave winding portions) and inner segment conductors 82 (overlapping winding portions) of the segment conductor set 70 are alternately joined.

(Fractional slot)
In order to realize a 1.8 times slot (N = 2−1 / 5), the first U-phase winding portion 190 is wound around the armature core 32 by 1.8 turns counterclockwise, and the second U-phase winding portion 200 is wound clockwise by 1.8 turns and connected in series (or connected in parallel). Considering the number N of slots for each pole and phase, since N1 = N2 = 1.8 in both the first U-phase winding portion and the second U-phase winding portion, the U-phase winding has N = 1.8 (both As an average value).

  As shown in FIGS. 28 to 30, the first U-phase winding portion 190 has a U-phase connection line 191 connected to the U-phase terminal connection line and is wound around the armature core 32 in the counterclockwise direction. A winding 192 and a second left-turn winding 193 having a final end 195 that travels in the same direction and is connected to the winding transition portion 194 formed of a four-slot pitch overlapping winding portion. Here, the second left-turn winding 193 jumps over the 1/5 pole pair (2 poles) at the connection line 198 during one round, and is wound only in the slots of the 4/5 pole pair (8 poles). The number of slots N1 for each pole and phase of the first U-phase winding is N1 = 1 + 4/5 = 1.8.

  As shown in FIGS. 31 to 33, the second U-phase winding unit 200 is a first right-turn winding wound around the armature core 32 clockwise from the winding start 201 located at the same position as the final end 195. 202 and a second right-turn winding 203 connected to this by a turn transition portion 204 composed of a wave winding portion with a 6-slot pitch and proceeding in the same direction, with the end 209 of the turn connected to the neutral point N. Composed. Here, the second right-hand winding 203 is wound at the end 209 before the 1/5 pole pair (2 poles) that makes one turn, and is wound only in the slots of the 4/5 pole pair (8 poles). The number of slots N2 for each pole and phase of the second U-phase winding is N2 = 1 + 4/5 = 1.8.

(Connection line)
As shown in FIG. 30, the second left-hand winding 193 includes a protrusion 196 extending from the top of the U-shaped bent portion connected to the first layer conductor 73a in the slot (7), and the slot (23). It has a connecting line 198 that is joined by a projecting portion 197 that extends from the top of the U-shaped bent portion that is connected to the fourth layer conductor 73b and that short-circuits 196-197. As a result, the overlapping winding portion 82 below the connection line is limited to the first left-handed winding (one coil wound around the slot (12) and the slot (17)). In the second right-handed winding 203, the winding end 209 connected to the neutral point N is positioned in front of the 180 ° symmetrical position of the connection line 198 as shown in FIG. The lap winding portion 82 is only the first right-hand winding (one coil wound in the slots (39) to (44)).

  As described above, the inter-pole jumping means such as the connection line 198 eliminates the slot corresponding to the pole pair (two poles) of 1/5 of the second left winding 193 and the second right winding 203. In the entire first and second U-phase winding portions, N1 = N2 = 2−1 / 5 = 1.8.

(Series connection)
The final end 195 of the first U-phase winding portion 190 and the winding start 201 of the second U-phase winding portion 200 are within the first layer conductor 73a in the slot (34) and the slot (39) as shown in FIG. The third segment conductor 83b is connected in series with a deformed segment conductor 205 having a 5-slot pitch.

(Joint slot pitch)
The third pitch W3 and the fourth pitch W4 which are the joint side slot pitches are 27-22 = 5 slot pitches between slot (27) -slot (22) in FIG. 29, and others are also 5 slot pitches. is there. Also, in FIG. 33, between slot (22) and slot (17), 22-17 = 5 slot pitch, and all others are 5 slot pitches. As described above, the third pitch and the fourth pitch, which are the joint-side slot pitches, are both equal to 5 slot pitches and smaller than the magnetic pole pitch 5.4.

(Slot pitch of lap winding part)
The second pitch W2 of the lap winding portion 82 is 27-22 = 5 slot pitch between slot (27) -slot (22) in FIG. 29 and FIG. Only the portion 194 has a 4-slot pitch). In FIG. 30, between slot (22) and slot (17), 22-17 = 5 slot pitch, and all others are 5 slot pitches. Thus, the second pitch W2 of the lap winding portion 82 is a 5-slot pitch, which is smaller than the magnetic pole pitch 5.4.

(Slot pitch of wave winding part)
The first pitch W1 of the wave winding portion 72 is a 5-slot pitch at 72a (slot (22) -slot (17)) in FIGS. 29 and 30, and a 6-slot pitch at the other 72b. . In FIGS. 31 to 33, the pitch is 6 slots at all positions 72b. As described above, the first pitch W1 of the wave winding portion 72 is almost 72b and is 6 slot pitch, but the second pitch W2 of the overlapping winding portion 82 to be combined inside is 5 slot pitch. The axial protrusion length can be suppressed by optimizing the shape of the U-shaped bent portion 75 of the wave winding portion 72. The case of 10 poles has been described above, but the same configuration can be applied to the case where the number of pole pairs is an odd number such as 6, 14 poles.

(effect)
According to the fourth embodiment, N = n ± k / m slots (n = 1, 2,...; M = 3, 5, 7; k is an integer less than m / 2). Therefore, when the number of pole pairs is an odd number (6, 10, 14 poles), an intermediate value of the number of turns that can be realized in an integer slot can be selected, and the degree of freedom of the number of turns is improved. When the number of conductors in each slot 34 of the armature core 32 is 4, when N is swung from 1.8 to 3.2 in 1/5 increments, the number of turns is 7.2, 8,. Can be set every 8 and 0.8 turns. Further, the third pitch and the fourth pitch can be made a multiple slot pitch (2/5 slot pitch) that is at least 1 / m smaller than the magnetic pole pitch, and the protruding length of the joining side end can be shortened. In addition, the second pitch W2 of the lap winding portion 82 is also smaller than the magnetic pole pitch, and the axial protruding length on the bending side can be shortened.

(Other examples and effects)
The present invention is not limited to the contents shown in the above-described embodiments, and can be implemented by appropriately modifying the prior art and the embodiments of the present invention in combination. For example, the armature winding 40 is generally a star connection of the U-phase winding 40U, the V-phase winding 40V, and the W-phase winding 40W as described above (FIG. 4). When it is necessary to reduce the number) and increase the number of parallel circuits, the three phases are separated at the neutral point N, which is the end of winding of each phase winding, and the winding start and end of each phase winding are cyclic You may change and use for the delta connection connected to.

  In the fourth embodiment, the final end 195 of the first U-phase winding portion 190 and the winding start 201 of the second U-phase winding portion 200 are connected in series. However, the first U-phase winding portion and the second U-phase winding portion are connected in series. The wire portion may be connected in parallel, the final end 195 of the first U-phase winding portion 190 is connected to the neutral point N, and the winding start 201 of the second U-phase winding portion 200 is connected to the U-phase terminal or the first U-phase. This can be implemented by connecting to any of the U-phase terminal connection lines 191 of the winding part.

  As an effect, in addition to the above, the magnetic field distribution formed by the armature winding can be made close to a sine wave by the effect of short-pitch winding in which the winding pitches W2, W3, and W4 are shorter than the magnetic pole pitch. Further, in terms of the distributed winding coefficient, since it is a fractional slot, it acts as if the number of slots is increased, and harmonics contained in the induced electromotive force can be reduced. There is an effect of reducing torque pulsation and magnetic noise during motor operation.

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. It is a U phase winding figure of the armature of the 3rd example. FIG. 17 is a partially enlarged view of FIG. 16. FIG. 17 is another partially enlarged view of FIG. 16. It is a 1st U phase winding figure of the armature of the 3rd example. FIG. 20 is a partially enlarged view of FIG. 19. FIG. 20 is another partially enlarged view of FIG. 19. It is a 2nd U-phase coil | winding figure of the armature of 3rd Example. FIG. 23 is a partially enlarged view of FIG. 22. FIG. 23 is another partially enlarged view of FIG. 22. It is a U phase winding figure of the armature of the 4th example. FIG. 26 is a partially enlarged view of FIG. 25. FIG. 26 is another partially enlarged view of FIG. 25. It is a 1st U-phase coil | winding figure of the armature of 4th Example. It is a partially enlarged view of FIG. FIG. 29 is another partially enlarged view of FIG. 28. It is a 2nd U-phase coil | winding figure of the armature of 4th Example. FIG. 32 is a partially enlarged view of FIG. 31. FIG. 32 is another partially enlarged view of FIG. 31.

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)

An armature core (32) having N slots (34) for each pole and phase, and a first layer conductor (73a) and a second layer conductor (83a) accommodated in the slots in order from the radially inner side to the outer side The armature winding (40) composed of a multiphase winding having a third layer conductor (83b) and a fourth layer conductor (73b), and constituting each phase winding (40U, 40V and 40W) The first phase winding (90) and the second phase winding (100) each include a plurality of wave winding portions (72) and a plurality of overlapping winding portions (82) arranged alternately in the circumferential direction. Including each
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,
N = n + 1/2 slots (n = 1, 2,...) Are provided for each pole and each phase, and each of the first and second phase windings has a circumference of the armature core. N turns and n + 1 turns in opposite directions are connected in series, and the third pitch and the fourth pitch are equal and at least 1/2 slot pitch smaller than the magnetic pole pitch. Characteristic segment conductor type armature. An armature core having N slots for each pole and phase, and a first layer conductor, a second layer conductor, a third layer conductor, and a fourth layer conductor housed in the slots in order from the radially inner side to the outer side The first and second phase windings constituting the phase windings are composed of a plurality of waves arranged alternately in the circumferential direction. Each including a winding part and a plurality of overlapping winding parts,
The wave winding section includes a first-layer conductor and a fourth-layer conductor that are separated from each other by a first pitch, a U-shaped bent portion that connects each end of the first-layer conductor and the fourth-layer conductor, and the first-layer conductor. A pair of joint-side ends extending from the other ends of the conductor and the fourth layer conductor and bent away from each other in the circumferential direction, and the overlapped winding portions are separated from each other by a second pitch and the second layer conductor and the third layer A layer conductor, a U-shaped bent portion that connects one end of each of the second layer conductor and the third layer conductor, and extends from each other end of the second layer conductor and the third layer conductor so as to approach each other in the circumferential direction A pair of bent joint side ends,
The ends of the joint-side ends 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 conductor separated from each other by a fourth pitch. Segment conductor type armature in which the tips extending from each are joined to each other,
The slot is provided with N = n ± 1/4 (n = 1, 2,...) Per phase per pole, and the first phase winding and the second phase winding are formed of the armature core. The n-th and n ± 1/2 turns are wound in the opposite directions of the circumference and connected in series, and the third pitch and the fourth pitch are equal, and at least 1/4 slot pitch from the magnetic pole pitch. A segment conductor type armature characterized by being set small . An armature core having N slots for each pole and phase, and a first layer conductor, a second layer conductor, a third layer conductor, and a fourth layer conductor housed in the slots in order from the radially inner side to the outer side The first and second phase windings constituting the phase windings are composed of a plurality of waves arranged alternately in the circumferential direction. Each including a winding part and a plurality of overlapping winding parts,
The wave winding section includes a first-layer conductor and a fourth-layer conductor that are separated from each other by a first pitch, a U-shaped bent portion that connects each end of the first-layer conductor and the fourth-layer conductor, and the first-layer conductor. A pair of joint-side ends extending from the other ends of the conductor and the fourth layer conductor and bent away from each other in the circumferential direction, and the overlapped winding portions are separated from each other by a second pitch and the second layer conductor and the third layer A layer conductor, a U-shaped bent portion that connects one end of each of the second layer conductor and the third layer conductor, and extends from each other end of the second layer conductor and the third layer conductor so as to approach each other in the circumferential direction A pair of bent joint side ends,
The ends of the joint-side ends 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 conductor separated from each other by a fourth pitch. Segment conductor type armature in which the tips extending from each are joined to each other,
N = n ± k / m (n = 1, 2,...; M = 3, 5, 7; k is an integer less than m / 2) provided for each pole and each phase. The windings and the second phase windings are wound in the direction opposite to the circumference of the armature core in an amount equivalent to n ± k / m circumferences and connected in series with each other, or connected in parallel with each other. The segment conductor type armature , wherein the fourth pitch is equal and is set to be at least j / m (j is an integer less than m) slot pitch smaller than the magnetic pole pitch . The segment conductor type armature according to any one of claims 1 to 3, wherein the second pitch is set smaller than a magnetic pole pitch . The segment conductor type armature according to any one of claims 1 to 3 , wherein the second pitch is set smaller than the first pitch . Wherein the first pitch segment conductor type armature of claim 1, wherein it is set smaller than the 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 U-shaped bending portion of the wave winding portion and the U-shape of the lap winding portion. The segment conductor type armature according to any one of claims 1 to 6, wherein the segment conductor type armature is not more than half of the conductor width of the bent portion .

Images