JP2016025772A - Rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce eddy current loss and suppress occurrence of a cyclic current regardless of the number of teeth allocated to individual phases in a rotary electric machine stator.SOLUTION: A rotary electric machine stator 10 includes individual phase windings 20 wound about teeth 16 of a stator core 12 by concentrated winding. The individual phase windings 20 of the teeth 16 wound multiple-times in radial directions of the teeth 16 are divided into 4 blocks from a first block to a fourth block from root sides toward leading end sides of the teeth 16, the first block and the fourth block are connected in series and defined as a conductor A, the second block and the third block are connected in series and defined as a conductor B, and the conductor A and the conductor B are connected to each other in parallel and defined as windings of the teeth 16.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine stator, and more particularly to a rotating electrical machine stator in which each phase winding is wound in a concentrated manner.

  When the output of the three-phase rotating electrical machine is increased, the winding current increases, so that the conductor is thickened to suppress heat caused by the generated copper loss. When the conducting wire is thickened, bending workability and the like are lowered, eddy current loss generated in the conducting wire is increased, and the efficiency of the rotating electrical machine is lowered. Therefore, the conducting wire constituting each phase winding is divided into a plurality of thin conducting wires, and these are connected in parallel. For example, in the case of a U-phase winding, a conductor having a cross-sectional area S is wound around each tooth of the stator as two thin conductors having a cross-sectional area of S / 2, and these two conductors are connected in parallel to form a U-phase winding. And

  However, when two conductors are wound around one tooth, the two conductors cannot be wound at exactly the same location on the teeth, so the winding length between the two conductors connected in parallel differs. A difference in resistance value occurs. For this reason, even if the voltage between the terminals of the two conductors is the same, a circulating current flows between the two conductors. Since the loss of the rotating electrical machine increases when the circulating current flows, it is necessary to suppress the circulating current.

  In Patent Document 1, for each of the six teeth corresponding to the three-phase rotating electric machine, the two conductors of the inner winding and the outer winding are overlapped on each tooth and concentrated winding, and the circulating current when the two conductors are connected in parallel is measured. A suppression method is disclosed. Here, when connecting two conductors between two teeth in six teeth of the same phase, the inner wiring of one tooth is connected to the outer wiring of the other tooth, and the outer wiring of one tooth is connected to the other of the other teeth. Connect to the inner wiring of the teeth. It is stated that by repeating such alternate connection, the number of inner conductors and the number of outer conductors included in each of the two conductors can be made the same in the entire six teeth of the same phase.

  As a technique related to the present invention, in a structure in which two conductors of an inner winding and an outer winding are overlapped and concentratedly wound for each of a plurality of teeth of each phase of a stator of a three-phase rotating electrical machine, and the two conductors are connected in parallel. However, Patent Documents 2 to 5 describe a method for connecting windings in parallel.

JP 2008-109829 A JP 2004-328917 A JP 2014-45540 A JP 2010-252611 A JP 2005-110413 A

  For each of a plurality of teeth of each phase of a stator of a three-phase rotating electric machine, when two conductors of an inner winding and an outer winding are overlapped and concentratedly wound and the two conductors are connected in parallel, a circulating current is generated between the two conductors. . The method of Patent Document 1 that can suppress this can be applied when the number of teeth assigned to each phase in the stator is an even number, cannot be applied when the number of teeth is an odd number, and the application range is limited.

  An object of the present invention is to provide a rotating electrical machine stator that can reduce eddy current loss and suppress the generation of circulating current regardless of the number of teeth in each phase.

  A rotating electrical machine stator according to the present invention is wound in a concentrated manner on a stator core including a base portion and a plurality of teeth arranged to project radially from the base portion toward the inner circumference, and on each tooth of the stator core. Windings of each tooth including four windings that are wound a plurality of times along the radial direction of the teeth from the base side to the tip side of the teeth from the first block to the fourth block. The first block and the fourth block are connected in series to form a conductive wire A, the second block and the third block are connected in series to form a conductive wire B, and the conductive wires A and B are connected in parallel to each other. It is characterized by a line.

  According to the said structure, the coil | winding wound by each tooth | gear of a rotary electric machine stator is the conducting wire A which connects in series the 1st block arrange | positioned at the front end side of a teeth, and the 4th block arrange | positioned at the base side. The conducting wire B connecting the second block and the third block arranged in the middle between the tip side and the root side in series is connected in parallel to each other. Thereby, in one tooth, the resistance value of the conducting wire A and the conducting wire B connected in parallel can be made substantially the same. For example, in a three-phase rotating electrical machine, regardless of whether the number of teeth assigned to each phase is an odd number or an even number, eddy current loss can be reduced and the generation of circulating current can be suppressed.

It is a figure which shows dividing the wiring arrange | positioned at one teeth of the rotary electric machine stator which concerns on this invention into four blocks, and connecting. It is a figure which shows that the winding of the four blocks of FIG. 1 is allocated to the conducting wire A and the conducting wire B, and the conducting wire A and the conducting wire B are connected in parallel. It is a perspective view of the coil | winding arrange | positioned at one teeth of FIG. FIG. 3A shows that the winding is composed of four blocks from the first block to the fourth block, and FIG. 3B shows that the winding interval is increased for the second block and the third block. It is a figure which shows winding of an inner side winding and an outer side winding. It is a figure which shows the modification of FIG. It is a figure which shows another modification of FIG. It is a figure which shows the prior art example with respect to FIG. It is a figure which shows another prior art example.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. The dimensions, shape, material, number of teeth, number of turns of windings, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the rotating electrical machine stator. Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a partial view of a rotating electrical machine stator 10. Below, unless otherwise indicated, the rotary electric machine stator 10 is called the stator 10. FIG. The stator 10 includes a stator core 12 and each phase winding 20 wound around the stator core 12. The rotating electrical machine is a three-phase rotating electrical machine that functions as an electric motor when the vehicle is powered and functions as a generator when the vehicle is braking. The rotating electrical machine includes a stator 10 and a rotor that is disposed on the inner peripheral side of the stator 10 with a predetermined magnetic gap therebetween.

  The stator core 12 is an annular magnetic part, and includes a base portion 14 on the outer peripheral side, a plurality of teeth 16 protruding from the base portion 14 toward the inner diameter side, and slots 18 and 19 that are spaces between adjacent teeth 16. The Each phase winding 20 is inserted into the slot 18 and wound along the wall surface of the tooth 16 and is pulled out into the slot 19, and this is repeated and wound with a predetermined number of turns. Although not shown, an insulator is disposed between the tooth 16 and each phase winding 20. Each phase winding 20 wound around the tooth 16 protrudes from the axial end of the stator core 12 to form a coil end.

  The stator core 12 is formed by laminating a plurality of annular magnetic thin plates formed into a predetermined shape including the teeth 16 and the slots 18 and 19. An electromagnetic steel plate can be used as the magnetic thin plate. Instead of the laminated body of magnetic thin plates, a magnetic powder integrally formed into a predetermined shape can be used.

  Each phase winding 20 is composed of a U-phase winding, a V-phase winding, and a W-phase winding in a three-phase rotating electrical machine. The number of teeth 16 of the stator core 12 is a multiple of 3. For example, when the number of teeth 16 is 15, five teeth 16 around which a U-phase winding is wound and teeth 16 around which a V-phase winding is wound. There are five teeth 16 around which the W-phase winding is wound. Distributed winding and concentrated winding are known as the winding method of each phase winding 20, but here, concentrated winding in which only one phase winding is wound around one tooth 16.

  For example, the U-phase winding in the rotating electrical machine is configured by connecting in series the windings respectively concentrated on the teeth 16 of the five teeth 16 assigned to the U-phase. A distinction is made between the concentrated U phase windings of each tooth 16 and the U phase winding in a rotating electrical machine constituted by connecting them in series, and the former is designated as a U phase winding 20 in one tooth 16. The latter is called the entire U-phase winding 120. FIG. 1 shows a U-phase winding 20 in one tooth 16. Hereinafter, unless otherwise specified, the U-phase winding 20 in one tooth 16 is simply referred to as a U-phase winding 20.

  U-phase winding 20 is formed of a conductive wire with an insulating film. Copper wires, copper-tin alloy wires, silver-plated copper-tin alloy wires, etc. are used as the strands of the conductive wires with insulating coatings. Used.

  In view of the space factor in the slot 18, the insulated wire with the insulating film is preferably a rectangular wire with a rectangular cross-sectional shape rather than a round wire with a circular cross-sectional shape. The U-phase winding 20 has a configuration in which a conductor cross-sectional area S is divided into two in order to suppress heat due to copper loss, and two thin conductors each having a S / 2 cross-sectional area are connected in parallel. I take the. The cross-sectional area S is set to S / 2 by dividing the rectangular cross-section into equal parts. In FIG. 1, the conducting wire having the cross-sectional area S is divided into two by dividing lines along the radial direction of the teeth 16. Two thin conductor wires having a cross-sectional area S / 2 were used. Two thin conducting wires are an inner winding wound along the wall surface of the tooth 16 and an outer winding wound around the outer side of the inner winding. The term “wrapping on the outside of the inner winding” means that the position along the radial direction of the teeth 16 is the same and wound in the same manner.

  Therefore, at the same position along the radial direction of the teeth 16, a lap winding composed of an inner winding and an outer winding wound around the outer side of the inner winding is disposed. Eight U-phase windings 20 are formed along the radial direction of the teeth 16. Here, with regard to the number of turns of the winding, if it is assumed that the number of turns = 1 that one conductor is wound once along the wall surface of the tooth 16, the inner winding having the same position along the radial direction of the tooth 16 The number of turns of the outer winding is 2. A lap winding with the number of turns = 2 is wound at one position along the radial direction of the teeth 16 and is referred to as the number of stages = 1 to distinguish it from the number of turns = 2. Therefore, the U-phase winding 20 has eight turns of lap windings with the number of turns = 2, so that the total number of turns = 16.

  In FIG. 1, the radial direction of the teeth 16 is shown. The radial direction of the teeth 16 is the same direction as the radial direction of the stator core 12 and is a longitudinal direction in which the teeth 16 extend from the base portion 14. The radial base side is the base portion 14 side of the tooth 16, and the radial tip side is the inner peripheral side of the stator core 12.

  Since the winding length of one turn is different between the inner winding and the outer winding, the resistance value of one winding is higher in the outer winding than in the inner winding if the cross-sectional area is the same. When the inner winding and the outer winding are connected in parallel, a circulating current flows due to the difference in resistance value. In addition, since the distance from the tooth 16 serving as a magnetic path is different between the inner winding and the outer winding, the magnitude of the linkage flux due to the magnetic field from the rotor is different. In addition, since the distance from the rotor is different between the tip side winding and the root side winding of the tooth 16, the magnitude of the interlinkage magnetic flux due to the magnetic field from the rotor is different.

  Therefore, as shown in FIG. 1, the U-phase winding 20 having eight lap windings is divided into four blocks along the radial direction of the teeth 16. Here, it is assumed that two lap windings are one block. They are a 1st block, a 2nd block, a 3rd block, and a 4th block toward the front end side from the base side of the teeth 16. FIG.

  The first block is composed of one lap winding on the base side and two lap windings, one lap winding on the tip side. One stage of the lap winding on the base side starts with the outer windings A1 and A2 and ends with the inner windings A3 and A4. The one-stage lap winding on the tip side starts with the inner windings A5 and A6 and ends with the outer windings A7 and A8. One level of lap winding on the base side and one level of lap winding on the tip end side are connected from the inner winding A4 to the inner winding A5 (see the interwinding wire 30 in FIG. 3B). ) Is provided and connected. Therefore, the winding start of the first block is A1 of the outer winding, and the winding end is A8 of the outer winding.

  The second block is configured in the same winding manner as the first block. That is, it is composed of one lap winding on the root side and two lap windings, one lap winding on the tip side. One stage of the lap winding on the base side starts with the outer windings B1 and B2 and ends with the inner windings B3 and B4. The one-stage lap winding on the tip side starts with the inner windings B5 and B6 and ends with the outer windings B7 and B8. One lap winding on the base side and one lap winding on the tip side are connected by connecting a winding crossover wire 30 (see FIG. 3B) from B4 of the inner winding to B5 of the inner winding. Is done. Therefore, the winding start of the second block is B1 of the outer winding and the winding end is B8 of the outer winding.

  The third block is also configured in the same winding manner as the first block and the second block. That is, it is composed of one lap winding on the root side and two lap windings, one lap winding on the tip side. One stage of the lap winding on the base side starts with the outer windings B9 and B10 and ends with the inner windings B11 and B12. The one-stage lap winding on the tip side starts with the inner windings B13 and B14 and ends with the outer windings B15 and B16. One stage of the lap winding on the base side and one stage of the lap winding on the tip side thereof are connected to B12 to B13 by providing an interwinding wire 32 (see FIG. 3B). Therefore, the winding start of the third block is B9 of the outer winding and the winding end is B16 of the outer winding.

  The fourth block is also configured in the same winding manner as the first block to the third block. That is, it is composed of one lap winding on the root side and two lap windings, one lap winding on the tip side. One stage of the lap winding on the base side starts with the outer windings A9 and A10 and ends with the inner windings A11 and A12. The one-stage lap winding on the tip side starts with the inner windings A13 and A14 and ends with the outer windings A15 and A16. One stage of the lap winding on the base side and one stage of the lap winding on the tip end side thereof are connected to each other by providing an inter-winding wire (see inter-winding wire 32 in FIG. 3B) from A12 to A13. . Therefore, the winding start of the fourth block is A9 of the outer winding, and the winding end is A16 of the outer winding.

  Then, the winding end A8 of the first block and the A9 of the fourth block are connected by the inter-block crossover wire 22. As a result, the winding start A1 of the first block to the winding end A16 of the fourth block are wound around the tooth 16 with one winding and the number of turns = 8. When this one conducting wire is a conducting wire A, the input end AIN of the conducting wire A is the outer wiring A1, and the output end AOUT is the outer wiring A16.

  In the second block and the third block, the winding end B8 of the second block and the winding start B9 of the third block are connected by the inter-block connecting line 34 (see FIG. 3B). As a result, B1 at the beginning of winding of the second block to B16 at the end of winding of the third block are wound around the teeth 16 with a number of turns = 8 by one conductor. When this one conductor is a conductor B, the input terminal BIN of the conductor B is the outer wiring B1, and the output terminal BOUT is the outer wiring B16.

  FIG. 2 is a diagram in which the U-phase winding 20 is configured by connecting the conducting wire A and the conducting wire B to each other in parallel. A1 that is AIN and B1 that is BIN are connected to each other, and serve as a terminal on the U terminal side of a rotating electrical machine drive circuit (not shown). In addition, A16 as AOUT and B16 as BOUT are connected to each other and serve as a neutral point side terminal for the Y connection of the rotating electrical machine.

  The terminals on the U terminal side and the terminals on the neutral wire side are because the three-phase rotating electric machine has five teeth 16 assigned to the U phase. This is because it is composed of five U-phase windings 20 connected in series. The terminal on the U terminal side in FIG. 3 is connected to the terminal on the neutral line side of the U-phase winding 20 disposed on the previous tooth 16, and the terminal on the neutral line side in FIG. 3 is disposed on the subsequent tooth 16. The U-phase winding 20 is connected to a terminal on the U terminal side, and this is repeated five times to constitute the entire U-phase winding 120. The two terminals of the entire U-phase winding 120 are the neutral points of the U-phase terminal of the rotating electrical machine drive circuit and the Y connection. In that sense, the terminal on the U terminal side and the terminal on the neutral point side in FIG. 3 are intermediate terminals of a part of the entire U-phase winding 120 of the rotating electrical machine stator 10.

  In the example of FIG. 2, the conductive wire A and the conductive wire B are connected in parallel for each tooth 16, but instead, it is wound around the five teeth 16 assigned to the U phase of the rotating electrical machine. The conductors A connected in series with each other and the conductors B wound around the five teeth 16 connected in series may be connected in parallel. In this case, the AIN of each tooth 16 is connected to the AOUT of the next tooth 16, the BIN of each tooth 16 is connected to the BOUT of the next tooth 16, and this is repeated to become a composite conductor A and a composite conductor B. These are connected in parallel to form the entire U-phase winding 120. In the following, it is assumed that the conductive wire A and the conductive wire B are connected in parallel for each tooth 16.

  Referring to FIG. 1, the two lap windings A1 to A8 of the first block constituting the conducting wire A are wound around the root side of the tooth 16 and the eight blocks A9 to A16 of the fourth block constituting the conducting wire A are performed. Is wound around the tip end side of the tooth 16. On the other hand, the two tiers B1 to B8 of the second block constituting the conducting wire B are wound along the radial direction of the teeth 16 toward the tip side compared to A1 to A8 of the first block, thereby constituting the conducting wire B. The two tiers B9 to B16 of the third block to be wound are wound closer to the root side than the fourth block along the radial direction of the teeth 16. Thus, the conducting wire A is configured by connecting the windings arranged on the root side and the windings arranged on the tip side along the radial direction of the teeth 16, and the conducting wire B is more than the windings constituting the conducting wire A. Is also configured by connecting windings arranged at intermediate positions along the radial direction of the teeth 16.

  Moreover, since the conducting wire A has four stages of overlapping windings and the total number of turns is 8, and the conducting wire B has four stages of overlapping windings and the total number of turns is 8, the total number of turns of each of the conducting wires A and B is the same. Further, the number of turns of the inner winding constituting the conductor A is 4, the number of turns of the outer winding is 4, the number of turns of the inner winding constituting the conductor B is 4, and the number of turns of the outer winding is 4, and the inner winding The number of turns and the number of turns of the outer winding are the same for the conductor A and the conductor B. Thereby, the circulating current between the conducting wire A and the conducting wire B can be made substantially zero, and the magnitude of the linkage flux from the rotor can be made substantially the same between the conducting wire A and the conducting wire B.

  FIG. 3 is a perspective view of the U-phase winding 20 disposed on the tooth 16. FIG. 3A shows that the U-phase winding 20 is composed of four blocks from the first block to the fourth block, and FIG. 3B shows the winding interval between the second block and the third block. It is a figure which shows winding of an inner side coil | winding and an outer side coil | winding.

  In FIG. 3A, the lead side direction and the counter lead side direction of the coil end of the U-phase winding 20 are shown. The lead side is the side from which AIN, BIN, AOUT, and BOUT are drawn. The U-phase winding 20 is provided with the AIN of the conducting wire A and the BIN of the conducting wire B at the right lead-side coil end as viewed from the front end side of the tooth 16, and the AIN and conducting wire B of the conducting wire A at the left-side lead-side coil end. BIN is provided. All of AIN, BIN, AOUT, and BOUT are drawn from the outer winding.

  Thus, since AIN, BIN, AOUT, and BOUT are all drawn from the outer winding, the inner winding is wound around the wall surface of the tooth 16 and then the outer winding is wound on the inner winding. It is difficult to form the U-phase winding shown in FIG. Therefore, it is preferable to form the U-phase winding 20 in advance by the winding method as shown in FIG.

  In FIGS. 1 and 3, the teeth 16 have a uniform cross section along the radial direction. However, in order to incorporate the U-phase winding 20 into the teeth 16, the teeth 16 preferably have a shape with a tapered tip. When the tooth 16 having a tapered tip is used, the resistance value of the winding wound on the root side is higher than the resistance value of the winding wound on the tip side of the tooth 16. Even in this case, the resistance value of the conducting wire A and the resistance value of the conducting wire B can be made closer by connecting as shown in FIG. 2, and the generation of circulating current can be suppressed.

  AIN and BIN in FIG. 3A are connected to each other. Between the connection point and the connection point of AOUT and BOUT of the next U-phase tooth 16 on the right side of the tooth 16 when viewed from the front end side of the tooth 16 in FIG. Connected with lines. Similarly, AOUT and BOUT are connected to each other. Between the connection point and the connection point of the AIN and BIN of the next U-phase tooth 16 on the left side of the tooth 16 when viewed from the front end side of the tooth 16 in FIG. Connected with.

  In addition, as described in FIG. 1, the basic structure of the windings of the first block, the second block, the third block, and the fourth block is the same, and each block is composed of two lap windings. The connection between the first stage and the second stage of the lap winding is performed by a connecting wire between the windings. In the case of the second block and the third block in FIG. 3B, the connection between the first block B4 and the second block B5 in the second block is between the windings at the lead side coil end. In the second block, the connection between the first-stage B12 and the second-stage B13 of the lap winding is performed by the inter-winding crossover line 32 at the lead side coil end. Further, the connection between the second block and the third block constituting the conductive wire B is performed by the inter-block connecting wire 34 at the lead side coil end.

  Thus, the lead wire B is provided with the two interwinding wires 30 and 32 and the one interblock wire 34 at the lead side coil end in order to connect the four-stage windings of the lap winding. At the side coil end, a maximum of three windings overlap. On the other hand, since there is no interwinding connecting wire or interblock connecting wire at the non-lead side coil end, only two windings overlap at the coil end. The conducting wire A connects the first block and the fourth block with an inter-block connecting wire 22, and the inter-block connecting wire 22 is connected to the lead side coil ends of the second block and the third block constituting the conducting wire B. Provided. Therefore, the anti-lead side coil end of the U-phase winding 20 only needs to overlap two windings, whereas the lead side coil end has a maximum of four winding overlaps, and the height of the coil end is The lead side is higher than the non-lead side.

  FIG. 4 is a modification of the configuration of FIG. 1 in which AIN and BIN are drawn from adjacent outer windings, and similarly, AOUT and BOUT are also drawn from adjacent outer windings. Compared with FIG. 1, the first and second stages of the first block lap winding are switched, the first and second stages of the fourth block lap winding are switched, and accordingly, the block of the conductor A in FIG. 1. The configuration shown in FIG. 4 can be obtained by moving the crossover line 22 and changing it to the block crossover line 40. Thus, AIN and BIN can be easily connected by drawing AIN and BIN next to each other. Similarly, AOUT and BOUT can be easily connected by drawing AOUT and BOUT side by side.

  FIG. 5 is also a modification of the configuration of FIG. 1, and instead of the connecting wire 22 provided on the lead side of the conducting wire A, the inter-block connecting wire 42 for the conducting wire A and the connecting block for the conducting wire B are connected to the non-lead side coil end. A line 44 is provided. Compared with FIG. 1, A8 and B16 are interchanged, A7 and new A8 are connected by an inter-block crossover wire 42 at the anti-lead side coil end, and B15 and new B16 are inter-block crossover wire 42 at the anti-lead side coil end. It can be set as the structure of FIG. As a result, the winding overlap at the lead side coil end is three and the winding overlap at the counter lead side coil end is four so that the height of the coil end does not change much between the lead side and the counter lead side. it can.

  6 and 7 are diagrams showing examples of the prior art. FIG. 6 shows an inner winding in which one of the thin insulated wires is wound along the wall surface of the tooth 16 as two thin insulated wires having a sectional area S / 2 instead of the insulated wires having a sectional area S. A wire is used as the outer winding wound around the inner winding, and eight windings are provided in the radial direction of the teeth 16. In FIG. 6, the outer windings are indicated by A1 to A16, and the inner windings are indicated by B1 to B16. The outer winding with the number of turns = 8 is the conductor A, A1 is AIN, and A16 is AOUT. The inner winding with the number of turns = 8 is the conductor B, B1 is BIN, and B16 is BOUT. Here, when the conductor A and the conductor B are connected in parallel to form the U-phase winding 20, the resistance value of the conductor A of the outer winding becomes higher than the resistance value of the conductor B of the inner winding, and a circulating current is generated. . Further, there is a difference between the magnitude of the flux linkage with respect to the lead A and the magnitude of the flux linkage with respect to the lead B.

  Patent Document 1 discloses a method for suppressing the circulating current, but this method can be applied only when teeth corresponding to a multiple of 2 are assigned, and each equivalent is 5 teeth as in the present invention. Not applicable when is assigned. 1 to 5, the resistance value of the conductor A and the resistance value of the conductor B can be made substantially the same for each tooth 16, so that the circulating current can be controlled regardless of the number of teeth assigned to each phase. Generation can be suppressed.

  FIG. 7 is a modified example of FIG. 6, in which eight thin layers of a conductor with a thin insulation coating having a cross-sectional area of S / 2 are arranged on the tip side, with four layers of the wrapping on the root side of the teeth 16 being a conductor A. The winding 4 stage is a conducting wire B. When the teeth 16 have a uniform cross section along the radial direction, the generation of circulating current can be suppressed even if the conductors A and B are connected in parallel. Even in this case, there is a difference between the magnitude of the flux linkage with respect to the lead A and the magnitude of the flux linkage with respect to the lead B. In addition, when the teeth 16 have a tapered shape along the radial direction, a circulating current is generated when the conducting wire A and the conducting wire B are connected in parallel. 1 to 5, the resistance value of the conducting wire A and the resistance value of the conducting wire B can be made substantially the same, and the magnitude of the linkage flux with respect to the lead A and the magnitude of the linkage flux with respect to the lead B can be made substantially the same. Can be the same.

  10 (rotary electric machine) stator, 12 stator core, 14 base portion, 16 teeth, 18, 19 slots, 20 (in one tooth) U-phase winding (each phase winding), 22, 34, 40, 42, 44 blocks Crossover wire, 30 and 32 winding crossover wire, 120 (overall) U-phase winding.

Claims (1)

A stator core including a base portion and a plurality of teeth arranged to protrude radially from the base portion toward the inner circumference;
Winding wound around each tooth of the stator core with concentrated winding;
Including
The winding of each tooth
What is wound a plurality of times along the radial direction of the teeth is divided into four blocks from the first block to the fourth block from the root side to the tip side of the teeth,
The first block and the fourth block are connected in series to form a conductor A,
The second block and the third block are connected in series to form a conductor B,
A rotating electrical machine stator in which a conducting wire A and a conducting wire B are connected in parallel to form a winding of the teeth.

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