JP2014096986A - Method for manufacturing stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a stator of a rotary electric machine capable of preventing occurrence of cyclic current between parallel-connected coils and also improving productivity of the coils.SOLUTION: In a stator 13 for a rotary electric machine M, two coils 25 for each of three phases are respectively connected in parallel. A method of winding the coil whose coil pitch is a value (6) obtained by dividing the number (48) of slots 24 by the number (8) of poles of the coils 25, is employed as a full-pitch winding. A method of winding the coil at a coil pitch larger than the coil pitch of the full-pitch winding is employed as a long-pitch winding. A method of winding the coil at a coil pitch smaller than the coil pitch of the full-pitch winding is employed as a short-pitch winding. A first U-phase coil 25U1 and a second U-phase coil 25U2 are wave-wound by alternately repeating the long-pitch winding and the short-pitch winding along a circumferential direction of a stator core 22.

Description

  According to the present invention, a coil is wound in a slot between teeth arranged in a plurality on a stator core, a plurality of coils for each phase are provided in each pole, and a plurality of coils for each phase are connected in parallel. The present invention relates to a method of manufacturing a stator of a rotating electrical machine.

  In a rotating electrical machine, the rotor and the stator may be eccentric. At this time, in the stator in which the coils are connected in parallel, a circulating current is generated in the parallel circuit due to the unbalance of the electromotive force due to the eccentricity, and vibration and noise during driving of the rotating electrical machine may increase. In order to suppress this circulating current, for example, a winding structure of a rotating electrical machine disclosed in Patent Document 1 has been proposed.

  The stator winding in Patent Document 1 has U-phase, V-phase, and W-phase coils. As shown in FIG. 10, one end of the U-phase coil 110 </ b> U is connected to the U-phase terminal 120 </ b> U of the three-phase cable, and the other end is a neutral point N. The U-phase coil 110U includes a first coil group A including U-phase coils 111U, 112U, 115U, and 116U connected in series, and a second coil including U-phase coils 113U, 114U, 117U, and 118U connected in series. Group B. The first coil group A and the second coil group B are connected in parallel.

  The U-phase coils 111U and 112U and the U-phase coils 115U and 116U of the first coil group A are disposed so as to be separated in the circumferential direction of the stator core 100 and opposed to the radial direction of the stator core 100. The U-phase coils 113U and 114U and the U-phase coils 117U and 118U of the second coil group B are disposed so as to be separated in the circumferential direction of the stator core 100 and opposed to the radial direction of the stator core 100. Yes. For this reason, the circulating current between the first coil group A and the second coil group B connected in parallel is suppressed.

  Further, in the first coil group A, a part of the wiring (crossover wire) connecting the U-phase coils 112U and 115U is the same teeth as the U-phase coil 113U of the second coil group B as shown by the broken line in FIG. It is wound around. On the other hand, in the second coil group B, a part of the wiring connecting the U-phase coils 114U and 117U is wound around the same teeth as the U-phase coil 116U of the first coil group A as shown by the broken line in FIG. ing. Therefore, the crossover is passed through the slot as a part of the coil, and the coil end of the stator is miniaturized.

JP 2006-311716 A

  However, in Patent Document 1, in order to suppress the circulating current, the U-phase coils of the first coil group A and the second coil group B are separated and arranged opposite to each other. There is a problem that the wiring for connecting the U-phase coils thus made becomes long and the productivity of the coils is poor.

  An object of the present invention is to provide a method of manufacturing a stator of a rotating electrical machine that can prevent the generation of circulating current between coils connected in parallel and can improve the productivity of the coil.

  A method of manufacturing a stator of a rotating electrical machine for solving the above-described problem is that a coil is wound around a slot between a plurality of teeth arranged in a stator core, and a plurality of the coils of each phase are provided in each pole. A method of manufacturing a stator of a rotating electrical machine in which a plurality of coils for each phase are connected in parallel, wherein the stator of the rotating electrical machine is a method of winding a coil with a value obtained by dividing the number of slots by the number of poles as a coil pitch Is a full-pitch winding, a winding with a coil pitch larger than the coil pitch of the whole-pitch winding is a long-pitch winding, and a winding with a coil pitch smaller than the coil pitch of the full-pitch winding is a short-pitch winding. The long-winding winding and the short-winding winding are alternately wound along the circumferential direction of the stator core, and each coil is continuously continuous. The lead wire is formed from a preform coil formed in advance so as to have an annular shape and a plurality of protrusions, and plural preform coils can be arranged along the inside of the annular portion of one preform coil. This preform coil is formed, and one preform coil and another preform coil arranged inside the preform coil are inserted into another corresponding slot.

  According to this, in the stator of the manufactured rotating electrical machine, each of the coils connected in parallel makes one round of the stator core while repeating long-pitch winding and short-pitch winding alternately. In each coil that makes one turn of the stator core, short-pitch winding and long-pitch winding correspond to all the poles, and the amount of interlinkage magnetic flux generated in each coil is the same. That is, the interlinkage magnetic flux does not change between the coils connected in parallel. For this reason, there is no difference in the amount of interlinkage magnetic flux between the coils connected in parallel, and there is no difference in the induced voltage between the coils connected in parallel, thereby preventing the generation of circulating current. The coils connected in parallel are wound by one frequency along the circumferential direction of the stator core. Therefore, unlike the background art, in order to prevent circulating current, it is not necessary to separate and arrange the coils so as to face each other, and the wiring for connecting the separated coils does not become long because of the opposed arrangement.

  Moreover, about the manufacturing method of the stator of a rotary electric machine, by arranging another preform coil along the inside of one preform coil, and inserting these preform coils into a slot separately, these preform coils Can be inserted into the corresponding slots without interfering with each other, and the productivity of the stator can be improved.

In the method of manufacturing the stator of the rotating electrical machine, the length of the linear portion inserted into the slot is the same in the one preform coil and the other preform coil.
According to this, if the straight portions have the same length, even if the straight portions are inserted into the slots, the lengths of the portions protruding from the stator core are not changed, and interference between the portions protruding from the stator core is also suppressed. be able to.

  In addition, regarding a method of manufacturing a stator of a rotating electrical machine, in the one preform coil, a tip-side arc portion that forms the coil end of the long-pitch winding, and in the other preform coil, the short-pitch coil The arc portion on the front end side forming the end is formed by a protrusion facing outward of the preform coil, and the arc portion on the front end side of the one preform coil is the other preform. A base end side arc portion forming a short end winding coil end in the one preform coil, and a long end winding coil end in the another preform coil. The base end side arc portion to be formed is formed by a portion projecting inward between adjacent projections of the preform coil. Both towards the proximal arcuate portion of the further preform coil is larger than the base end-side arc portion of said one preform coils.

  According to this, mutual interference can be suppressed by a set of a long-pitch coil end and a short-pitch coil end located on each end face of the stator core.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the circulating current between the coils connected in parallel can be prevented, and also the productivity of a coil can be improved.

The whole sectional side view showing the rotary electric machine of an embodiment. (A) is the sectional view on the AA line of FIG. 1, (b) is the elements on larger scale which show the stator core of this embodiment. A simplified diagram for explaining wave winding. The perspective view which shows a 1st U-phase coil and a 2nd U-phase coil. (A) is a top view which shows the state which mounted the 1st U-phase coil in the inserter, (b) is a top view which shows the state which inserted the 2nd U-phase coil inside the 1st U-phase coil. The simplified diagram which shows the stator of another example. The simplified diagram which shows the stator of another example. The simplified diagram which shows the stator of another example. The simplified diagram which shows the stator of another example. The figure which shows background art.

Hereinafter, an embodiment in which a stator of a rotating electrical machine according to the present invention is embodied will be described with reference to FIGS.
As shown in FIG. 1, the rotor 11 constituting the rotating electrical machine M is fixed to the rotating shaft 12, and the stator 13 constituting the rotating electrical machine M is fitted to the inner peripheral surface of the motor housing 14. Is fixed. In addition, oil for cooling the stator 13 is sealed in the motor housing 14 to a position where the rotor 11 is not immersed.

  As shown in FIG. 2A, the stator 13 constituting the rotating electrical machine M includes an annular stator core 22 and a coil 24 that is passed through a slot 24 between a plurality of teeth 23 arranged on the inner periphery of the stator core 22. Become. The stator 13 of the rotating electrical machine M of the present embodiment has three phases, eight poles P, and the number 24 of slots 24 is 48 (three-phase eight poles 48 slots). The coil 25 passed through the slot 24 is wound around each tooth 23 by wave winding. In FIG. 2A, the coil end of each coil 25 is not shown.

  As shown in FIG. 1, the stator core 22 is configured by laminating a plurality of core plates 33 made of a magnetic material (steel plate). Note that the length along the axial direction of the stator core 22, specifically, the thickness of the core plate 33 in the stator core 22 is T. The rotor 11 constituting the rotating electrical machine M includes a rotor core 34 and a plurality of permanent magnets 35 embedded in the rotor core 34. The rotor core 34 is configured by laminating a plurality of core plates 36 made of a magnetic material (steel plate). A shaft hole 341 is provided at the center of the rotor core 34, and the rotary shaft 12 is passed through and fixed to the shaft hole 341.

  FIG. 2 (b) schematically shows the slot 24 and the coil connection at the partially broken portion of FIG. 2 (a). As shown in FIG. 2B, the coil 25 is formed using a plurality of conductive wires. The coil 25 includes a first U-phase coil 25U1 and a second U-phase coil 25U2, a first V-phase coil 25V1 and a second V-phase coil 25V2, and a first W-phase coil 25W1 and a second W-phase coil 25W2. The coil ends of the coils 25 are the first U-phase coil 25U1, the second U-phase coil 25U2, the first V-phase coil 25V1, the second V-phase coil 25V2, and the first W-phase coil from the outer peripheral side to the inner peripheral side of the stator core 22. 25W1 and second W-phase coil 25W2 are arranged in this order. The slots 24 are filled with coils 25, and the coils 25 are arranged concentrically with the central axis of the rotary shaft 12.

  The slots 24 through which the first U-phase coil 25U1 is passed are referred to as slots 24U11 and 24U12, and the slots 24 through which the second U-phase coil 25U2 is passed are referred to as slots 24U21 and 24U22. The slots 24 through which the first V-phase coil 25V1 is passed are referred to as slots 24V11 and 24V12, and the slots 24 through which the second V-phase coil 25V2 is passed are referred to as slots 24V21 and 24V22. Further, the slot 24 through which the first W-phase coil 25W1 is passed is referred to as slots 24W11 and 24W12, and the slot 24 through which the second W-phase coil 25W2 is passed is referred to as slots 24W21 and 24W22.

  On one end face side of the stator core 22, the first U-phase coil 25U1 is passed through the slot 24U12 by skipping the six slots 24 from the slot 24U11, and the coil pitch is 7 slot pitch. 2B, on the other end face side of the stator core 22, the first U-phase coil 25U1 is passed through the slot 24U12 by skipping four slots 24 from the slot 24U11, and the coil pitch is 5 slots. It is pitch. On the other hand, on the one end face side of stator core 22, second U-phase coil 25U2 is passed through slot 24U22 by skipping four slots 24 from slot 24U21, and the coil pitch is 5 slot pitch. 2B, on the other end surface side of the stator core 22, the six slots 24 are skipped from the slots 24U21 and passed through the slots 24U22, and the coil pitch is 7 slot pitch.

  Here, when a coil having a coil pitch of a value (S / P) obtained by dividing the number S of slots 24 by the number of poles P (S / P) is a full-pitch winding, in this embodiment, a 6-slot pitch of 48/8 is obtained. The winding method becomes the whole-pitch winding. A winding method having a coil pitch larger than the 6-slot pitch is referred to as a long-pitch winding, and a winding method having a coil pitch smaller than the 6-pitch is referred to as a short-pitch winding. In this case, the first and second U-phase coils 25U1 and 25U2 are wound around the stator core 22 so that a 5-slot pitch and a 7-slot pitch are repeated alternately. First U-phase coil 25 </ b> U <b> 1 has long-pitch winding on one end surface side of stator core 22 and short-pitch winding on the other end surface side of stator core 22. On the other hand, the second U-phase coil 25U2 has a short-pitch winding on one end surface side of the stator core 22 and a long-pitch winding on the other end surface side of the stator core 22. The first U-phase coil 25U1 and the second U-phase coil 25U2 are a pair of long-pitch winding and short-pitch winding on one end face side of the stator core 22, and a pair of short-pitch winding and long-pitch winding on the other end face side. It is wound around the teeth 23 so that it becomes.

  Similarly, on the one end face side of the stator core 22, the first V-phase coil 25V1 is passed through the slot 24V12 by skipping the six slots 24 from the slot 24V11, and the coil pitch is 7 slot pitch (long winding). As shown by the broken line in FIG. 2B, the first V-phase coil 25V1 is passed through the slot 24V12 by skipping four slots 24 from the slot 24V11 on the other end surface side of the stator core 22, and the coil pitch is 5 slots. It has a pitch (short-pitch winding).

  On the other hand, the second V-phase coil 25V2 is passed through the slot 24V22 by skipping four slots 24 from the slot 24V21 on one end face side of the stator core 22, and the coil pitch is 5 slot pitch (short-pitch winding). 2B, on the other end surface side of the stator core 22, the second V-phase coil 25V2 is passed through the slot 24V22 by skipping the six slots 24 from the slot 24V21, and the coil pitch is 7 slots. The pitch is long. The first and second V-phase coils 25V1 and 25V2 are wound around the stator core 22 so that short-pitch winding and long-pitch winding are repeated alternately. First V-phase coil 25V1 and second V-phase coil 25V2 have a pair of long-pitch winding and short-pitch winding on one end surface side of stator core 22 and a pair of short-pitch winding and long-pitch winding on the other end surface side. It is wound around the teeth 23.

  Further, on one end face side of stator core 22, first W-phase coil 25W1 is passed through slot 24W12 by skipping six slots 24 from slot 24W11, and the coil pitch is 7 slot pitch (long-pitch winding). 2B, on the other end surface side of the stator core 22, the first W-phase coil 25W1 is passed through the slot 24W12 by skipping four slots 24 from the slot 24W11, and the coil pitch is 5 slots. It has a pitch (short-pitch winding).

  On the other hand, the second W-phase coil 25W2 is passed through the slot 24W22 by skipping four slots 24 from the slot 24W21 on one end face side of the stator core 22, and the coil pitch is 5 slot pitch (short-pitch winding). 2B, on the other end face side of the stator core 22, the second W-phase coil 25W2 is passed through the slots 24W22 by skipping the six slots 24 from the slots 24W21, and the coil pitch is 7 slots. The pitch is long. In this case, the first and second W-phase coils 25W1 and 25W2 are wound around the stator core 22 so that short-pitch winding and long-pitch winding are repeated alternately. The first W-phase coil 25W1 and the second W-phase coil 25W2 are such that a long-pitch winding and a short-pitch winding are paired on one end surface side of the stator core 22, and a short-pitch winding and a long-pitch winding are paired on the other end surface side. It is wound around the teeth 23.

  As shown in FIG. 3, the lead wire 25UH1 of the first U-phase coil 25U1 and the lead wire 25UH2 of the second U-phase coil 25U2 are connected to the U-phase terminal 40U of the inverter 40, respectively. The lead wire 25VH1 of the first V-phase coil 25V1 and the lead wire 25VH2 of the second V-phase coil 25V2 are connected to the V-phase terminal 40V of the inverter 40, respectively. The lead wire 25WH1 of the first W-phase coil 25W1 and the lead wire 25WH2 of the second W-phase coil 25W2 are connected to the W-phase terminal 40W of the inverter 40, respectively.

  The neutral point lead wire 25UT1 of the first U-phase coil 25U1 and the neutral point lead wire 25UT2 of the second U-phase coil 25U2 are connected at a neutral point N. Further, the neutral point lead line 25VT1 for the first V-phase coil 25V1 and the neutral point lead line 25VT2 for the second V-phase coil 25V2 are connected at a neutral point N. Further, the neutral point lead wire 25WT1 of the first W-phase coil 25W1 and the neutral point lead wire 25WT2 of the second W-phase coil 25W2 are connected at a neutral point N.

  The lead wires 25UH1, 25UH2 of both U-phase coils 25U1, 25U2, the lead wires 25VH1, 25VH2 of both V-phase coils 25V1, 25V2, and the lead wires 25WH1, 25WH2 of both W-phase coils 25W1, 25W2 They are arranged together in the range of the slot 24. Also, the neutral point lead wires 25UT1, 25UT2 for both U-phase coils 25U1, 25U2, the neutral point lead wires 25VT1, 25VT2 for both V-phase coils 25V1, 25V2, and the neutral points for both W-phase coils 25W1, 25W2 The point leader lines 25WT1 and 25WT2 are collectively arranged in the range of ten continuous slots 24. Therefore, in this embodiment, all the leader lines 25UH1, 25UH2, 25VH1, 25VH2, 25WH1, 25WH2 and all the neutral point leader lines 25UT1, 25UT2, 25VT1, 25VT2, 25WT1, 25WT2 are machines for three poles. They are arranged together within an angle (135 degrees). The leader lines 25UH1, 25UH2, 25VH1, 25VH2, 25WH1, and 25WH2, and the neutral point leader lines 25UT1, 25UT2, 25VT1, 25VT2, 25WT1, and 25WT2 are arranged on the upper side in FIG. The housing 14 is disposed at a position where it is not immersed in oil.

Next, the operation of the stator 13 will be described.
In the U phase of the stator 13, the first U phase coil 25U1 and the second U phase coil 25U2 are connected in parallel. The first U-phase coil 25U1 is wave-wound around the teeth 23 so that the short-pitch winding and the long-pitch winding are alternately repeated, and the second U-phase coil 25U2 is compared with the short-pitch winding of the first U-phase coil 25U1. In this way, the long winding is wound around the teeth 23 so that the short winding and the long winding are alternately repeated. Therefore, the first U-phase coil 25U1 and the second U-phase coil 25U2 connected in parallel by the first and second U-phase coils 25U1, 25U2 making one turn around the stator core 22 while alternately repeating long-pitch winding and short-pitch winding. The interlinkage magnetic flux remains the same without changing. For this reason, there is no difference in the amount of flux linkage between the first U-phase coil 25U1 and the second U-phase coil 25U2 connected in parallel, the induced voltage is not different, and the generation of circulating current is prevented. it can. In addition, the said effect | action is the same also in V phase and W phase.

  As shown in FIG. 5, the coil 25 is inserted into each slot 24 using an inserter 50. Since the method of inserting the coil 25 into the slot 24 is the same for each phase, the case where the U-phase first U-phase coil 25U1 and the second U-phase coil 25U2 are inserted into the slots 24U11, 24U12, 24U21, 24U22 will be described. To do.

  As shown in FIG. 4, the first U-phase coil 25U1 is formed by inserting a pre-shaped first U-phase preform coil 26U1 into slots 24U11 and 24U12. On the other hand, the second U-phase coil 25U2 is formed by inserting a pre-shaped second U-phase preform coil 26U2 into the slots 24U21 and 24U22. The first U-phase preform coil 26U1 is formed so that a seamless continuous wire is formed in an annular shape and has a cross shape. The first U-phase preform coil 26U1 has a winding start end portion (hereinafter referred to as a start end portion US1) which is one end side of the conducting wire positioned below and a winding end end portion (hereinafter referred to as the other end side of the conducting wire). , The end portion UE1) is aligned and formed on the upper side.

  The first U-phase preform coil 26U1 has four protrusions 27, and each protrusion 27 has a linear portion 27a extending linearly and a distal end side arc formed on the distal end side of the linear portion 27a. Part 27b. In addition, a proximal arcuate portion 27 c is formed between the adjacent protrusions 27. In the first U-phase preform coil 26U1, the straight portion 27a is inserted into the slot 24U11 and the slot 24U12, and the distal end side arc portion 27b forms a long-turn coil end, and the proximal end side arc portion 27c. Forms a coiled end with short turns. The length of the straight portion 27a is the same as the length (stack thickness T) along the axial direction of the stator core 22, or is equal to or greater than the stack thickness T with a margin such as cuff height. Further, the length along the distal end side arc portion 27b is a length corresponding to the 7 slot pitch (long-pitch winding coil pitch) along the circumferential direction of the stator core 22, and the proximal end side arc portion 27c The length along is a length corresponding to a 5-slot pitch (short-pitch coil pitch) along the circumferential direction of the stator core 22.

  The second U-phase preform coil 26U2 is formed so as to form a seamless continuous wire in an annular shape and a cross shape. The second U-phase preform coil 26U2 has a winding start end portion (hereinafter referred to as a start end portion US2) which is one end side of the conducting wire located below and a winding end end portion (hereinafter referred to as the other end side of the conducting wire). , The end portion UE2) is aligned and formed on the upper side. The second U-phase preform coil 26U2 has four protrusions 28. Each protrusion 28 has a linear portion 28a extending linearly, and a distal-side arc formed on the distal end side of the linear portion 28a. Part 28b. In addition, a proximal-side arc portion 28c is formed between adjacent protrusions 28. In the second U-phase preform coil 26U2, the straight portion 28a is inserted into the slot 24U21 and the slot 24U22, and the distal end side arc portion 28b forms a short-turn coil end, and the proximal end side arc portion 28c. Form a long coil end.

  Similar to the first U-phase preform coil 26U1, the length of the straight portion 28a of the second U-phase preform coil 26U2 is the same as the length (stack thickness T) along the axial direction of the stator core 22, or the cuff height The thickness is more than T with some margin. Further, the length along the distal end side arc portion 28b is a length corresponding to the 5-slot pitch (short pitch coil pitch) along the circumferential direction of the stator core 22, and the proximal end side arc portion 28c The length along the length corresponds to a 7-slot pitch (long-pitch coil pitch) along the circumferential direction of the stator core 22.

  Further, the second U-phase preform coil 26U2 has a distal-side arc portion 28b smaller than the distal-side arc portion 27b of the first U-phase preform coil 26U1, and a proximal-side arc portion 28c of the first U-phase preform coil 26U1. It is formed larger than the base end side arc portion 27c and is slightly smaller than the first U-phase preform coil 26U1. The second U-phase preform coil 26U2 can be inserted inside the first U-phase preform coil 26U1.

  When the start end US2 of the second U-phase preform coil 26U2 is a portion drawn from the straight line portion 28a, the length of the start end US2 is equal to or less than the length corresponding to 5 slot pitches (short-pitch coil pitch), That is, the length is equal to or shorter than the length of the distal end side arc portion 28b. Therefore, the start end US2 is disposed along the tip end arc portion 28b along the straight portion 28a from the base end arc portion 28c, and in the present embodiment, the leading edge of the start end US2 is the tip end arc portion 28b. Located on the top. That is, the starting end US2 and the terminal end UE2 are both drawn out from the distal end side arc portion 28b forming a short winding, and in this embodiment, the length of the starting end US2 as one of them is a short winding coil. It is set below the length of the pitch.

  As shown in FIG. 5 (a), the inserter 50 has a plurality of inserter blades 52 that are formed in a rod shape on a base 51 and are arranged on the circumference at equal intervals, and can be moved up and down on the circumference. A stripper 53 is installed. In this embodiment, each set is arrange | positioned at equal intervals so that the three inserter blades 52 may become one set. In each group, a gap is provided between the three inserter blades 52. These three inserter blades 52 include a tooth 24 forming a slot 24U11 for the first U-phase coil 25U1, a slot 24U21 for the second U-phase coil 25U2, a slot 24U12 for the first U-phase coil 25U1, and a second U-phase coil. This corresponds to the tooth 23 forming the slot 24U22 for 25U2.

  In order to insert the first and second U-phase preform coils 26 </ b> U <b> 1 and 26 </ b> U <b> 2 into the slot 24, first, the first U-phase preform coil 26 </ b> U <b> 1 is placed on the base 51. At this time, the lead wire of the first U-phase preform coil 26U1 passes between the inserter blades 52 positioned at the outer side and the center of the pair of inserter blades 52 adjacent to each other with the linear portions 27a of the protrusions 27 adjacent to each other. Is placed as follows. Further, the base-side arc portion 27 c is located inside a circle (stripper 53) surrounded by the inserter blade 52. Furthermore, the starting end portion US1 of the first U-phase preform coil 26U1 is drawn outward from the tip end side arc portion 27b, and the end portion UE1 is drawn out from the tip end side arc portion 27b. .

  Next, as shown in FIG. 5 (b), the second U-phase preform coil 26U2 is placed on the base 51 and inserted inside the first U-phase preform coil 26U1. At this time, the conducting wire of the second U-phase preform coil 26U2 passes between the inserter blades 52 located at the inner side and the center of the pair of inserter blades 52 in which the straight portions 28a of the respective protrusions 28 are adjacent to each other. Is placed as follows. Further, the proximal end side arc portion 28 c is arranged inside a circle surrounded by the inserter blade 52. The starting end US2 of the second U-phase preform coil 26U2 is bent along the tip-side arc portion 28b of the protrusion 28 to prevent interference with the first U-phase preform coil 26U1. Further, the terminal end UE2 of the second U-phase preform coil 26U2 is drawn outward from the distal end side arc portion 28b.

  Then, the stripper 53 is pushed up toward the stator core 22 (not shown in FIG. 5). Then, when the proximal end side arc portions 27c and 28c of the first and second U-phase preform coils 26U1 and 26U2 are pulled up, the linear portion 27a of the first U-phase preform coil 26U1 is inserted into the slots 24U11 and 24U12 and the first U-phase is formed. A coil 25 </ b> U <b> 1 is formed and wound around the stator core 22. At the same time, the linear portion 28a of the second U-phase preform coil 26U2 is inserted into the slots 24U21 and 24U22 to form the second U-phase coil 25U2, and is wound around the stator core 22.

  As shown in FIG. 2A, as a result of the first and second U-phase coils 25U1 and 25U2 being wound around the stator core 22, the first U-phase coil 25U1 is positioned below the first U-phase preform coil 26U1. The starting end portion US1 that has been positioned is located on the tip end side (inner peripheral side of the stator core 22) of the slot 24U11. The starting end US1 is connected to the neutral point lead line 25UT1. Further, in first U-phase coil 25U1, termination portion UE1 located on the upper side of first U-phase preform coil 26U1 is located on the back side of slot 24U12, and termination portion UE1 is connected to lead wire 25UH1. ing.

  On the other hand, in the second U-phase coil 25U2, the start end US2 located on the lower side of the second U-phase preform coil 26U2 is positioned on the tip side of the slot 24U21 (inner peripheral side of the stator core 22). Portion US2 is connected to neutral point lead wire 25UT2 of second U-phase coil 25U2. Further, in second U-phase coil 25U2, termination portion UE2 located on the upper side of second U-phase preform coil 26U2 is located on the back side of slot 24U22, and termination portion UE2 is connected to second U-phase coil 25U2. It is connected to the leader line 25UH2.

In the present embodiment, the following effects can be obtained.
(1) In the stator 13 of the rotating electrical machine M, the first U-phase coil 25U1 and the second U-phase coil 25U2 are connected in parallel in the U phase. The first U-phase coil 25U1 starts with a short-pitch winding from the lead wire 25UH1, and then is wound so that the long-pitch winding and the short-pitch winding are alternately repeated along the circumferential direction of the stator core 22. It ends with. The second U-phase coil 25U2 starts from the lead wire 25UH2 with long-pitch winding, and then is wound in such a manner that short-pitch winding and long-pitch winding are alternately repeated, and ends with short-pitch winding. In the first U-phase coil 25U1 and the second U-phase coil 25U2 that make one round of the stator core 22, short-pitch winding and long-pitch winding correspond to all the poles, and the linkage generated in each coil 25U1, 25U2 The amount of magnetic flux is the same. Therefore, even if the rotor 11 is eccentric, the interlinkage magnetic flux between the first U-phase coil 25U1 and the second U-phase coil 25U2 as viewed over the entire circumference does not change, and the first U-phase coil 25U1 and the second U-phase coil 25U2 It is possible to prevent a circulating current from occurring between them. In the V phase and the W phase, as in the U phase, it is possible to prevent a circulating current from being generated in two coils connected in parallel.

  (2) The first U-phase coil 25U1 and the second U-phase coil 25U2 are wound in such a manner that short-pitch winding and long-pitch winding are alternately repeated. That is, the first U-phase coil 25 </ b> U <b> 1 and the second U-phase coil 25 </ b> U <b> 2 are wound by one frequency along the circumferential direction of the stator core 22. Therefore, unlike the background art, in order to prevent the generation of circulating current, it is not necessary to separate and arrange the coils facing each other. In this embodiment, the wiring for connecting the coils is long as in the background art. There is no end. Therefore, in the present embodiment in which the first U-phase coil 25U1 and the second U-phase coil 25U2 are simply wave-wound, the productivity of the first U-phase coil 25U1 and the second U-phase coil 25U2 can be improved. Similarly, in the V phase and the W phase, similarly to the U phase, the productivity of the coil can be improved.

  (3) The first U-phase coil 25U1 and the second U-phase coil 25U2 are wound in such a manner that short-pitch winding and long-pitch winding are repeated alternately. In the first U-phase coil 25U1, the lead wire 25UH1 and the neutral point lead wire 25UT1 can be drawn from a position separated by 7 slots, and in the second U-phase coil 25U2, the lead wire 25UH2 and the neutral point The leader line 25UT2 can be pulled out from a position separated by 5 slot pitches. Therefore, even if the first U-phase coil 25U1 and the second U-phase coil 25U2 are connected in parallel, the lead lines 25UH1, 25UH2 and the neutral point lead lines 25UT2, 25UT2 can be arranged close to each other. For example, as in the background art, it is assumed that the lead wires 25UH1, 25UH2 and the neutral point lead wires 25UT2, 25UT2 are wired at positions facing the stator core 22 in the radial direction. In this case, when the rotating electrical machine M is placed horizontally, one (for example, the neutral point lead wires 25UT2 and 25UT2) is immersed in the oil in the motor housing 14, so that the neutral point is prevented. It is necessary to route the lead wires 25UT2, 25UT2 to the upper side. However, in this embodiment, even if the rotating electrical machine M is placed horizontally and oil is sealed in the motor housing 14, the lead wires 25UH1, 25UH2 and the neutral point lead wires 25UT2, 25UT2 are combined together on the upper side. Therefore, the leader lines 25UH1, 25UH2 and the neutral point leader lines 25UT2, 25UT2 are not immersed in oil. Similarly, in the V phase and the W phase, as in the U phase, the leader lines 25VH1, 25VH2, 25WH1, 25WH2 and the neutral point leader lines 25VT1, 25VT2, 25WT1, 25WT2 are arranged close to the oil. There is no soaking.

  (4) Using the inserter 50, the first and second U-phase preform coils 26U1, 26U2 were inserted into the slots 24U11, 24U12, 24U21, 24U22. Then, the length of the start end portion US2 of the second U-phase preform coil 26U2 was made equal to or shorter than the length corresponding to 5 slot pitches (short-pitch coil pitch). In order to prevent interference with the first U-phase preform coil 26U1, the second U-phase pre-form US2 may be arranged along the distal end side arc portion 28b along the straight portion 28a from the proximal end side arc portion 28c. After the reforming coil 26U2 is inserted into the slots 24U21 and 24U22, the leading edge of the start end US2 does not enter the slots 24U21 and 24U22. The stator core 22 can be pulled out from the end surface. The same applies to the V phase and the W phase.

  (5) All the leader lines 25UH1, 25UH2, 25VH1, 25VH2, 25WH1, 25WH2 and all the neutral point leader lines 25UT1, 25UT2, 25VT1, 25VT2, 25WT1, 25WT2 are mechanical angles (135 degrees) ) Are arranged together. Therefore, it is easy to connect the lead wires 25UH1, 25UH2, 25VH1, 25VH2, 25WH1, 25WH2 to the inverter 40 and to connect the neutral point lead wires 25UT1, 25UT2, 25VT1, 25VT2, 25WT1, 25WT2 at the neutral point N. Can be done.

  (6) All neutral point leaders 25UT1, 25UT2, 25VT1, 25VT2, 25WT1, 25WT2 are gathered on the inner peripheral side of the stator core 22. For example, as compared with the case where the neutral point leaders 25UT1, 25UT2, 25VT1, 25VT2, 25WT1, 25WT2 are arranged on the outer peripheral side of the stator core 22, all the neutral point leaders 25UT1, 25UT2, 25VT1, 25VT2, The length along the circumferential direction of the stator core in the region where 25WT1 and 25WT2 are arranged can be shortened. Therefore, the length of the wiring for connecting the neutral point lead lines 25UT1, 25UT2, 25VT1, 25VT2, 25WT1, and 25WT2 at the neutral point N can be shortened.

In the present invention, the following embodiments are also possible.
In the embodiment, the stator 13 of the rotating electrical machine M is formed in the three-phase eight pole 48 slot, but may be formed in the three-phase six pole 54 slot as shown in FIG. In this case, in the present embodiment, when the number of slots 24 (S / 54) divided by the number of poles P (6) (S / P) is a full-pitch coil, the coil pitch is 54/6. The 9-slot winding method is a full-pitch winding. A winding method having a coil pitch larger than 9 slot pitch is referred to as long-pitch winding, and a winding method having a coil pitch smaller than 9 slot pitch is referred to as short-pitch winding. In this case, since the number of pole slots per phase is 3, three wave winding coils for each phase are used. For example, if the first coil, the second coil, and the third coil are sequentially arranged, the first and second U-phase coils 25U1, 25U2, the first and second V-phase coils 25V1, 25V2, and the first and second W-phase coils 25W1, 25W2 is wound around the stator core 22 so that a 7-slot pitch (short-pitch winding) and an 11-slot pitch (long-pitch winding) are repeated alternately. The third U-phase coil 25U3, the third V-phase coil 25V3, and the third W-phase coil 25W3 are wave-wound at a 9-slot pitch (full-pitch winding).

  Further, as shown in FIG. 7, the stator 13 of the rotating electrical machine M may be formed in a three-phase four-pole 36 slot. In this case, a winding method with a 9-slot pitch is a full-pitch winding. The number of slots per pole per phase is 3, and it is wave-wrapped in the same manner as the 54 slots of 3 phases 6 poles in FIG.

  Furthermore, as shown in FIG. 8, the stator 13 of the rotating electrical machine M may be formed in a three-phase six-pole 36 slot. In this case, the winding method with a 6-slot pitch is a full-pitch winding. The number of slots per pole for each phase is 2, and the wave is wound in the same manner as in the embodiment.

  In addition, as shown in FIG. 9, it may be formed in three phases, four poles and 48 slots. In this case, the winding method with a 12-slot pitch is a full-pitch winding. Since the number of slots per pole per phase is 4, four wave coils are used for each phase. For example, a first coil, a second coil, a third coil, and a fourth coil are sequentially set. In this case, the first and fourth U-phase coils 25U1 and 25U4, the first and fourth V-phase coils 25V1 and 25V4, and the first and fourth W-phase coils 25W1 and 25W4 each have a 9-slot pitch (short-pitch winding). The stator core 22 is wave-wound so that a 15-slot pitch (long winding) is repeated alternately. On the other hand, the second and third U-phase coils 25U2 and 25U3, the second and third V-phase coils 25V2 and 25V3, and the second and third W-phase coils 25W2 and 25W3 have 11 slot pitches (short winding) and 13 respectively. The stator core 22 is wave-wound so that the slot pitch (long winding) is repeated alternately.

  That is, when the number of pole slots per phase is 3, 5, 7,..., All-winding coils are included, and when the number of pole slots per phase is 4 or more, There are two or more combinations that repeat the long pitch slot pitch.

In the embodiment, the stator 13 of the rotating electrical machine M is formed with three phases, but may be formed with four or more phases.
In the present invention, the number of poles may be other than 4, 6, or 8. However, when applying the rotating electrical machine M for driving the vehicle, it is preferable to use 4 to 16 poles from the viewpoint of the physique, performance, and cost of the rotating electrical machine M.

  In the embodiment, the second U-phase preform coil 26U2 is inserted inside the first U-phase preform coil 26U1 in a state where the first U-phase preform coil 26U1 is placed on the inserter 50, but the reverse may be possible. That is, the first U-phase preform coil 26U1 may be arranged outside the second U-phase preform coil 26U2 in a state where the second U-phase preform coil 26U2 is placed on the inserter 50. In this case, in order to prevent the terminal portion UE2 of the second U-phase preform coil 26U2 from interfering with the first U-phase preform coil 26U1, the terminal portion UE2 extends from the base-side arc portion 28c along the straight portion 28a. It arrange | positions so that the front end side circular arc part 28b may be met. At this time, the length of the terminal portion UE2 is set to be equal to or shorter than the length corresponding to 5 slot pitches (short-pitch coil pitch) from the straight portion 28a (product thickness T). In this case, the terminal end UE2 of the second U-phase preform coil 26U2 is located on the back side of the slot 24U22.

The present invention may be applied to a stator of a rotating electric machine (outer rotor) in which the rotor 11 rotates around the stator 13.
The present invention may be applied to the rotary electric machine M, not the permanent magnet type rotary electric machine using a permanent magnet, but an induction type or reluctance type rotary electric machine.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) The coil is formed by inserting a preform coil into the slot, and the preform coil includes a linear portion inserted into the slot, and a distal-side arc portion formed at the tip of the linear portion. And a base end side arc portion formed at the base end of the linear portion, and the lead wire is disposed along the tip end arc portion.

  (B) A coil is wound in a slot between teeth arranged in the stator core, a plurality of coils for each phase are provided in each pole, and a plurality of coils for each phase are connected in parallel, and the number of slots is set. The coil winding with the value divided by the number of poles as the coil pitch is a full-pitch winding, the winding with a coil pitch larger than the coil pitch of the full-pitch winding is a long-pitch winding, and the full-pitch winding coil When the winding at a coil pitch smaller than the pitch is a short-pitch winding, the long-pitch winding and the short-pitch winding are alternately rotated along the circumferential direction of the stator core, and the rotation having the coil is wound. Electric stator.

  (C) The coils connected in parallel are continuous continuous wires, and the length of at least one lead wire out of a pair of lead wires drawn out from a portion forming the short-pitch winding is the short wire. A stator for a rotating electrical machine that is set to a coil pitch that is less than or equal to the coil pitch of the winding.

(D) A stator of a rotating electric machine, wherein the pair of lead wires of each phase coil is located within a mechanical angle of three poles.
(E) A stator of a rotating electrical machine having 4 to 16 poles.

  (F) Of the pair of lead wires, the neutral lead wire is a stator of a rotating electrical machine located on the inner peripheral side of the stator core.

  M ... rotating electrical machine, 13 ... stator, 22 ... stator core, 23 ... teeth, 24 ... slot, 25 ... coil, 25U1 ... first U-phase coil, 25U2 ... second U-phase coil, 25V1 ... first V-phase coil, 25V2 ... first 2V phase coil, 25W1 ... 1st W phase coil, 25W2 ... 2nd W phase coil, 25UH1,25UH2,25VH1,25VH2,25WH1,25WH2 ... lead wire, 25UT1,25UT2,25VT1,25VT2,25WT1,25WT2 ... neutral point lead line.

Claims (3)

A method of manufacturing a stator of a rotating electrical machine in which coils are wound in slots between teeth arranged in a plurality on a stator core, a plurality of coils for each phase are provided in each pole, and a plurality of coils for each phase are connected in parallel Because
In the stator of the rotating electrical machine, the winding of the coil having a coil pitch that is a value obtained by dividing the number of slots by the number of poles is a full-pitch winding. When it is a long-pitch winding and the winding method with a coil pitch smaller than the coil pitch of the full-pitch winding is a short-pitch winding,
The coil is wound in a manner such that the long winding and the short winding are alternately repeated along the circumferential direction of the stator core,
Each coil is formed from a preformed coil that is formed in advance so that it has a ring and a plurality of protrusions of a continuous continuous wire.
A plurality of preform coils are formed so that another preform coil can be arranged along the inside of the annular portion of one preform coil, and one preform coil and another preform arranged inside the preform coil are formed. The manufacturing method of the stator of the rotary electric machine which inserts a reforming coil in a corresponding another slot.   2. The method of manufacturing a stator for a rotating electrical machine according to claim 1, wherein the one preform coil and the other preform coil have the same length of the linear portion inserted into the slot. In the one preform coil, a tip-side arc portion that forms the long-pitch coil end and a tip-side arc portion that forms the short-pitch coil end in the other preform coil are both It is formed by a protrusion facing outward of the preform coil, and the tip side arc portion of the one preform coil is larger than the tip side arc portion of the other preform coil,
In the one preform coil, a proximal-side arc portion that forms the short-pitch coil end and a proximal-end arc portion that forms the long-pitch coil end in the other preform coil. , Both of which are formed by a portion projecting inward between adjacent projecting portions of the preform coil, and the arc portion of the base end side of the another preform coil is the one preform The manufacturing method of the stator of the rotary electric machine according to claim 1 or 2, wherein the stator is formed larger than the arcuate portion on the base end side of the coil.