Stator, rotating electric machine, stator winding method, and stator manufacturing method

Abstract

To improve the manufacturing efficiency of the windings of a three-phase, 12-pole stator, particularly in terms of the efficiency of coil wiring work. [Solution] Three-phase windings are wound with conductors around 12 magnetic pole teeth T1 to T12 arranged at equal angular intervals on the inner circumference of a stator core that constitutes a three-phase, 12-pole stator, and each of the three phase windings has at least one location where the conductor is pulled out from a slot S to form a pull-out portion 112 and returns to the one slot S, and the conductors on both sides of the pull-out portion 112 are fixed within the one slot S by the conductors wound around the magnetic pole teeth T that constitute the one slot S after the pull-out portion 112 is formed. Furthermore, the windings of each phase are configured so that wiring can be performed to connect four coils C in parallel, and all of the lead portions for connecting the four coils C of each of the three phases to a power source are preferably pulled out from any of six consecutive slots S3 to S8 out of the 12 around the entire circumference.

Description

[Technical field]

[0001] The present invention relates to a 3-phase, 12-pole stator used in an electric motor such as a motor, in which three-phase coils are wound with conductors around 12 magnetic pole teeth provided at equal angular intervals on the inner circumference of a stator core, as well as to a rotating electric machine equipped with such a stator, and a winding method and manufacturing method for such a stator. [Background technology]

[0002] In rotating electrical machines such as motors, a configuration in which three-phase coils are wound around a stator and star-connected is widely used. In this configuration, generally, the electrical resistance can be reduced and energy efficiency can be improved by increasing the number of parallel connections of the coils of each phase. In recent years, there has been an increasing demand for energy saving from the perspective of environmental protection, and there is a strong demand for parallelization of coils.

[0003] However, when connecting coils in parallel, the number of lead wires for connecting each coil to a power source and the number of neutral wires for connecting to a neutral point increase according to the number of parallel connections, which leads to increased manufacturing time and complicated processes. Also, if the number of magnetic pole teeth is increased to increase the number of parallel connections, the total number of coil turns per stator increases, which also leads to increased manufacturing time.

[0004] In this regard, Patent Document 1 discloses a winding method for winding three-phase coils around a stator core having nine magnetic pole teeth arranged at equal angular intervals on its inner circumference, in which the lead wires that serve as the three power supply lines for the three coils for each phase come out of the same slot, improving work efficiency. Patent Documents 2 to 4 disclose various winding structures when a three-phase coil is wound around a stator core having 9 or 12 magnetic pole teeth arranged at equal angular intervals on the inner periphery. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4704177 [Patent Document 2] Patent No. 7371714 [Patent Document 3] JP 2024-40580 A [Patent Document 4] Patent No. 7434719 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the winding methods and winding structures described in Patent Documents 1 to 4, the efficiency of the wiring work for connecting the three-phase coils, which are wound with conductors around 12 magnetic pole teeth provided at equal angular intervals on the inner circumference of the stator core to form a three-phase, 12-pole stator, to a power source and a neutral point, was not sufficient. For example, Patent Document 1 discloses a configuration in which, in a three-phase, nine-pole stator, three power supply wires for each coil of three poles for each phase each extend from the same slot in the stator core to one end face side of the stator core, and the three power supply wires are wound around and fixed to a coil wound around the same magnetic pole tooth. However, no method is disclosed for realizing a similar configuration in a three-phase, 12-pole stator.

[0007] The present invention has been made in view of the above circumstances, and aims to improve the manufacturing efficiency of a three-phase, 12-pole stator winding in which three-phase coils are wound with conductors around 12 magnetic pole teeth arranged at equal angular intervals on the inner circumference of a stator core, particularly in terms of the efficiency of the coil wiring work. Another aim is to improve the manufacturing efficiency of a three-phase, 12-pole stator and a rotating electric machine such as a motor equipped with the same. [Means for solving the problem]

[0008] The stator of the present invention is for achieving the above object, and comprises a stator core having 12 magnetic pole teeth at equal angular intervals on its inner periphery with slots between the magnetic pole teeth, and three phase windings formed by conductors wound around the 12 magnetic pole teeth of the stator core. Each of the windings for each phase has at least one location where the conductor is drawn out from one slot to form a drawn-out portion and returns to the one slot, and the conductors on both sides of the drawn-out portion are fixed within the one slot by a conductor wound around one of the magnetic pole teeth that constitutes the one slot after the drawn-out portion is formed.

[0009] In such a stator, as one example, the windings of each phase are configured so that wiring is possible to connect four coils wound around one magnetic pole tooth in parallel, and all of the lead portions for connecting the four coils of each of the three phases to a power source may be drawn out from any of six slots that are consecutive in the circumferential direction of the stator core out of the 12 slots around the entire circumference.

[0010] Alternatively, each of the windings of each phase has a first portion and a second portion made of separate conductors, and the two end faces in the axial direction of the stator core are defined as a first end face and a second end face, respectively, and the 12 magnetic pole teeth are Stator core When the first tooth to the twelfth tooth are arranged in order in a first circumferential direction, which is one of the circumferential directions, in the first portion of one of the three phases, it is preferable that the conductor is wound as shown in the following (a1) to (a6). (a1) The first end face is pulled into a first slot adjacent to the first tooth. (a2) Next, the wire is wound around the first tooth in a first direction. (a3) Then, the wire is led out to the second end face side of the first slot and routed as a crossover wire to the second end face side up to the position of the second slot adjacent to the fourth tooth. (a4) Next, a first pull-out portion is formed on the first end face side, which is pulled into the second slot from the second end face side, led out from the first end face side without being wound around the magnetic pole tooth, pulled out a predetermined length, and then pulled again from the first end face side into the second slot. (a5) Next, the wire is wound around the fourth tooth in a second direction that is opposite to the first direction. (a6) Subsequently, it is drawn out to a first end face side of a third slot adjacent to the fourth tooth and opposite to the second slot.

[0011] In addition, in the second portion of the certain phase, it is preferable that the conductor is wound as shown in the following (b1) to (b7). (b1) The first end face is pulled into the fourth slot adjacent to the seventh tooth. (b2) Next, it is wound around the seventh tooth in the first direction. (b3) Subsequently, a second pull-out portion is formed on the first end face side, the second pull-out portion being led out from the first end face side of the fifth slot opposite the fourth slot adjacent to the seventh tooth, pulled out a predetermined length, and further pulled back into the fifth slot from the first end face side. (b4) Then, the wire is led out to the second end face side of the fifth slot, and is routed as a crossover wire to the second end face side up to the position of the sixth slot adjacent to the tenth tooth. (b5) Next, the second end face is pulled into the sixth slot. (b6) Next, it is wound around the tenth tooth in the second direction. (b7) Then, it is drawn out to the first end face side of the sixth slot.

[0012] Furthermore, the first slot may be between the first and second teeth, the second slot may be between the fourth and third teeth, the third slot may be between the fourth and fifth teeth, the fourth slot may be between the seventh and eighth teeth, the fifth slot may be between the seventh and sixth teeth, and the sixth slot may be between the tenth and eleventh teeth. Alternatively, the first slot is between the first tooth and the twelfth tooth, the second slot is between the fourth tooth and the fifth tooth, the third slot is between the fourth tooth and the third tooth, the fourth slot is between the seventh tooth and the sixth tooth, the fifth slot is between the seventh tooth and the eighth tooth, and the sixth slot is between the tenth tooth and the ninth tooth.

[0013] In each of the stators including the above (a1) to (b7), the windings of each of the three phases may differ in position in the circumferential direction by one magnetic pole tooth. Alternatively, in each stator including (a1) to (b7) above, the end wires of the first and second parts of each phase are all connected to a common neutral point, and the first and second lead portions are combined for each phase to form a lead portion for connection to a power source for that phase.

[0014] As another example, in the above stator, all of the lead portions for connecting the three-phase windings to a power source may be pulled out from any of three consecutive slots in the circumferential direction of the stator core out of the 12 slots around the circumference.

[0015] Alternatively, the two axial end faces of the stator core are defined as a first end face and a second end face, respectively, and the twelve magnetic pole teeth are defined as Stator core When the first tooth to the twelfth tooth are arranged in order in a first circumferential direction, which is one of the circumferential directions, in the winding of one of the three phases, the conductor may be wound as shown in (c1) to (c12) below. (c1) The first end face is drawn into a first slot adjacent to the first tooth. (c2) Next, it is wound around the first tooth in a first direction. (c3) Then, the wire is led out to the second end face side of the first slot and routed as a crossover wire to the second end face side up to the position of the second slot adjacent to the fourth tooth. (c4) Next, the second end face is pulled into the second slot. (c5) Next, it is wound around the fourth tooth in the first direction. (c6) Next, it is led out to the second end face side of the third slot opposite the second slot, adjacent to the fourth tooth, and is pulled around as a jumper wire to the second end face side to the position of the fourth slot adjacent to the seventh tooth. (c7) Subsequently, the pull-out portion is formed on the first end face side, which is pulled into the fourth slot from the second end face side, led out from the first end face side without being wound around the magnetic pole tooth, pulled out a predetermined length, and further pulled again into the fourth slot from the first end face side. (c8) Next, it is wound around the seventh tooth in a second direction that is opposite to the first direction. (c9) Then, the wire is led out to the second end face side of the fourth slot, and is routed as a crossover wire to the second end face side up to the position of the fifth slot adjacent to the tenth tooth. (c10) Next, the second end face is pulled into the fifth slot. (c11) Next, it is wound around the tenth tooth in the second direction. (c12) Then, it is drawn out to the first end face side of the fifth slot.

[0016] Furthermore, the first slot may be between the first and second teeth, the second slot may be between the fourth and third teeth, the third slot may be between the fourth and fifth teeth, the fourth slot may be between the seventh and sixth teeth, and the fifth slot may be between the tenth and eleventh teeth. Alternatively, the first slot is between the first tooth and the twelfth tooth, the second slot is between the fourth tooth and the fifth tooth, the third slot is between the fourth tooth and the third tooth, the fourth slot is between the seventh tooth and the eighth tooth, and the fifth slot is between the tenth tooth and the ninth tooth.

[0017] In each of the stators including (c1) to (c12) above, the windings of each of the three phases may differ in position in the circumferential direction by one magnetic pole tooth. In addition, in each stator including the above (c1) to (c12), the end wires of the windings of each phase are all connected to a common neutral point, and for each phase, the draw-out portion forms a lead portion for connection to a power source for that phase.

[0018] As another example of the above stator, the winding for each phase may include two coils wound in series around two adjacent magnetic pole teeth, the winding direction of each of the series wound coils may differ for each magnetic pole tooth, and all of the lead portions for connecting the two coils for each of the three phases to a power source may be pulled out from any of five consecutive slots in the circumferential direction of the stator core out of the 12 slots around the entire circumference.

[0019] Alternatively, the two axial end faces of the stator core are defined as a first end face and a second end face, respectively, and the twelve magnetic pole teeth are defined as Stator core When the teeth are arranged in order from the first tooth to the twelfth tooth in a first circumferential direction, which is one of the circumferential directions, in the winding of one of the three phases, it is preferable that the conductor is wound as shown in (d1) to (d8) below. (d1) The first end face is pulled into a first slot adjacent to the first tooth. (d2) Next, it is wound around the first tooth in a first direction. (d3) Next, the wire is wound around a second tooth in a second direction opposite to the first direction. (d4) The winding around the second tooth is completed in the second slot adjacent to the second tooth, and the wire is led out to the second end face side of the second slot and pulled as a jumper wire to the second end face side up to the position of the third slot adjacent to the seventh tooth. (d5) Subsequently, the pull-out portion is formed on the first end face side, which is pulled into the third slot from the second end face side, led out from the first end face side without being wound around the magnetic pole tooth, pulled out a predetermined length, and further pulled again into the third slot from the first end face side. (d6) Next, it is wound around the seventh tooth in the first direction. (d7) Next, it is wound around the eighth tooth in the second direction. (d8) Winding around the eighth tooth is completed in the fourth slot adjacent to the eighth tooth, and the wire is pulled out to the first end face side of the fourth slot.

[0020] Furthermore, the first slot may be between the first tooth and the twelfth tooth, the second slot may be between the second tooth and the third tooth, the third slot may be between the seventh tooth and the sixth tooth, and the fourth slot may be between the eighth tooth and the seventh tooth. Alternatively, the first slot may be between the first tooth and the second tooth, the second slot may be between the second tooth and the first tooth, the third slot may be between the seventh tooth and the eighth tooth, and the fourth slot may be between the eighth tooth and the ninth tooth.

[0021] In each of the stators including (d1) to (d8) above, the windings of each of the three phases may differ in position in the circumferential direction by two of the magnetic pole teeth. In addition, in each stator including the above (d1) to (d8), the end wires of the windings of each phase are all connected to a common neutral point, and for each phase, the draw-out portion forms a lead portion for connection to a power source for that phase. The present invention also provides a rotating electric machine including any one of the stators described above.

[0022] The present invention is not limited to the stators and rotating electric machines described above, but can be embodied in any form, such as any armature including these, a winding method thereof, a manufacturing method thereof, a winding machine that performs the winding method, an armature wound by the winding machine, a program for controlling the winding machine, a recording medium storing such a program, and a system including a plurality of devices. Effect of the Invention

[0023] According to the above-described configuration of the present invention, it is possible to improve the manufacturing efficiency of the windings of a three-phase, 12-pole stator in which three-phase coils are wound with conductors around 12 magnetic pole teeth arranged at equal angular intervals on the inner circumference of a stator core, particularly in terms of the efficiency of the coil wiring work. It is also possible to improve the manufacturing efficiency of a three-phase, 12-pole stator and a rotating electric machine such as a motor equipped with the stator. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a schematic plan view of a stator core wound according to an embodiment of the present invention, as viewed from the side where crossover wires are formed. [Diagram 2] FIG. 2 is a plan view similarly showing a stator formed by winding a winding including a three-phase coil around the stator core shown in FIG. [Diagram 3] 3A and 3B are diagrams showing the structure of a winding according to a first embodiment of the present invention, in which Fig. 3A shows the structure of a winding for only the U phase, and Fig. 3B shows the structure of a winding for three phases. [Figure 4] FIG. 4 is a diagram for explaining a star-connection structure that can be realized by the winding shown in FIG. 3B. [Diagram 5] FIG. 5 is a diagram for explaining the wiring work performed on the windings shown in FIG. 3B in order to form the star connection shown in FIG. [Figure 6]Figures 6A to 6D are diagrams for explaining an example of a winding machine for forming the winding shown in Figure 3B and a winding procedure by the winding machine. Figure 6A is a diagram showing the arrangement of nozzles in the winding machine. Figure 6B is a diagram showing the path of relative movement between the nozzle and the magnetic pole teeth when winding the wire around each magnetic pole tooth. Figure 6C is a diagram showing the positional relationship between the nozzle and the pin during the formation of the crossover wire. Figure 6D is a diagram for explaining the procedure for forming the lead-out portion. [Figure 7] FIG. 7 is a diagram showing an arrangement of nozzles in an example of a winding machine for forming a winding according to the fourth modified example of the first embodiment. [Figure 8] FIG. 8 is a diagram corresponding to FIG. 1, for explaining the notation of each magnetic pole tooth in the first modified example of the first embodiment. [Figure 9] 9A and 9B are diagrams corresponding to FIGS. 3A and 3B, respectively, which diagrammatically show a winding structure according to a first modified example of the first embodiment of the present invention. [Figure 10] 10A and 10B are diagrams corresponding to FIGS. 3A and 3B, respectively, which diagrammatically show a winding structure according to a second modified example of the first embodiment of the present invention. [Figure 11] FIG. 11 is a diagram for explaining the wiring work performed on the windings shown in FIG. 10B in order to form the star connection shown in FIG. [Figure 12] 12A and 12B are diagrams corresponding to FIGS. 3A and 3B, respectively, which diagrammatically show a winding structure according to a third modified example of the first embodiment of the present invention. [Figure 13] FIG. 13 is a diagram corresponding to FIG. 3B, which diagrammatically illustrates a winding structure according to a fourth modified example of the first embodiment of the present invention. [Figure 14] 14A and 14B are diagrams corresponding to FIGS. 3A and 3B, respectively, which diagrammatically show a winding structure according to a second embodiment of the present invention. [Figure 15] FIG. 15 is a diagram for explaining a star-connection structure that can be realized by the winding shown in FIG. 14B. [Figure 16]FIG. 16 is a diagram for explaining the wiring work performed on the windings shown in FIG. 14B in order to form the star connection shown in FIG. [Figure 17] 17A and 17B are diagrams corresponding to FIGS. 3A and 3B, respectively, which diagrammatically show a winding structure according to a modified example of the second embodiment of the present invention. [Figure 18] FIG. 18 is a diagram for explaining the wiring work performed on the windings shown in FIG. 17B in order to form the star connection shown in FIG. [Figure 19] 19A and 19B are diagrams corresponding to FIGS. 3A and 3B, respectively, which diagrammatically show a winding structure according to a third embodiment of the present invention. [Figure 20] FIG. 20 is a diagram for explaining a star-connection structure that can be realized by the winding shown in FIG. 19B. [Figure 21] FIG. 21 is a diagram for explaining the wiring work performed on the windings shown in FIG. 19B in order to form the star connection shown in FIG. [Figure 22] 22A and 22B are diagrams corresponding to FIGS. 3A and 3B, respectively, which diagrammatically show a winding structure according to a modified example of the third embodiment of the present invention. [Figure 23] FIG. 23 is a diagram for explaining a wiring operation performed on the windings shown in FIG. 22B to form a star connection in a modified example of the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0026] [First embodiment: Figs. 1 to 7] First, a schematic configuration of a stator 1 according to a first embodiment of the present invention will be described with reference to FIGS. Fig. 1 is a schematic plan view of a stator core 10 constituting the stator 1, seen from the side where the crossover wires are formed. Fig. 2 is a similar plan view showing the stator 1 formed by winding a winding including a three-phase coil around the stator core 10 shown in Fig. 1.

[0027] Stator core 10 has a hollow, generally cylindrical shape, and one axial end face (second end face) of stator core 10 appears in FIG. As shown in FIG. 1, the stator core 10 has 12 magnetic pole teeth (salient poles) T1 to T12, which correspond to the first tooth to the twelfth tooth, and are provided at equal angular intervals so as to protrude radially inward from the inner periphery of the surrounding annular portion 11. The annular portion 11 and the magnetic pole teeth T1 to T12 are configured as a continuous, integrated metal part. The magnetic pole teeth T are labeled T1 to T12 in order clockwise from the first magnetic pole tooth T1, which is used as a convenient reference, to the twelfth magnetic pole tooth T12. It is arbitrary which magnetic pole tooth is designated as T1. When individual magnetic pole teeth are not to be distinguished, the symbol "T" is used.

[0028] A slot S is formed between adjacent magnetic pole teeth T. Here, the slot formed between magnetic pole teeth T1 and T2 is labeled S1, and the slots are labeled S1 to S12 in clockwise order from there. When there is no need to distinguish between individual slots, the symbol "S" is used.

[0029] 1 and its rear surface of the metal part including the annular portion 11 and the magnetic pole teeth T, resin insulating materials 13, 23 are disposed, respectively (see Figs. 5, 6A, 6C, etc. for the rear surface). In Fig. 1, everything except the radial end of the annular portion 11 is insulating material 13. Even in the area shown as the magnetic pole teeth T, insulating material 13 that covers the metal part that constitutes the magnetic pole teeth T is shown in the figure.

[0030] The insulating material 13 includes an outer wall 14, a crossover arrangement portion 15, a pin 16, and a magnetic pole tooth covering portion 17 that covers the magnetic pole teeth T described above. The outer wall 14 is a wall that rises from the annular portion 11 in parallel with the central axis of the stator core 10 . There are twelve pins 16, each of which is positioned circumferentially at approximately the center between adjacent magnetic pole teeth T. The pins 16 are extended radially from the outer wall 14 by a length approximately equal to the width of the crossover wire arrangement section 15, and then rise up parallel to the central axis. The crossover arrangement portion 15 is a surface formed between the outer wall 14 and the pin 16 and perpendicular to the central axis.

[0031] A stator 1 according to a first embodiment of the present invention is formed as shown in FIG. 2 by winding a winding including a three-phase coil around a stator core 10 shown in FIG. As shown in FIG. 2, coils C1 to C12 are wound around each of the magnetic pole teeth T1 to T12 using a conductor 43 (see FIG. 6C). The coil wound around the magnetic pole tooth TN is CN (N is a natural number from 1 to 12). This conductor can be, but is not limited to, a wire material, such as a copper wire coated with insulating resin. As with the magnetic pole tooth T, the coils are also designated by the symbol "C" when individual coils are not to be distinguished.

[0032] The windings on the stator 1 also include a crossover wire L that connects a coil CX wound around a certain magnetic pole tooth TX to a coil CY (X and Y are both different natural numbers from 1 to 12) wound around another magnetic pole tooth TY. The crossover wire L is positioned radially inward of the stator core 10 by pins 16, and is hung across one or more pins 16 and arranged in a crossover wire arrangement section 15. Details of the structure and arrangement of the coil C and the crossover wire L will be described later with reference to Figures 3A and 3B, etc. In addition, the stator 1 is provided with lead wires for connecting the coil C to the power supplies of each phase and a neutral wire for connecting to a neutral point on the back surface (first end surface) side not shown in Figures 1 and 2. The arrangement of these lead wires and neutral wire will be described later with reference to Figure 5 etc.

[0033] In the stator 1 of the first embodiment, the coils C wound around each magnetic pole tooth T can be connected in a four-parallel star-connected structure as shown in Fig. 4. Then, as shown by the phantom lines in Fig. 2, a rotor 32 equipped with a magnet and capable of rotating around a rotating shaft 31 can be disposed in the hollow portion of the stator 1, thereby forming a motor, which is a rotating electric machine. By connecting each lead wire to an output circuit instead of a power supply, a generator, which is a rotating electric machine, can also be formed.

[0034] Next, the structure of the windings in the stator 1 will be described with reference to FIGS. 3A and 3B. Fig. 3A shows the structure of the winding for only the U phase, and Fig. 3B shows the structure of the winding for three phases. These figures show 12 magnetic pole teeth (hereinafter simply referred to as "teeth") T1 to T12 arranged in the circumferential direction, linearly developed as viewed from the center of the stator core 10, with the upper side of the figure being the second end face side that forms the crossover wire L shown in Figs. 1 and 2, and the lower side of the figure being the reverse side, the first end face side where the lead wires and neutral wire are arranged.

[0035] Each conductor constituting the windings such as coil C is indicated by a line around the magnetic pole teeth T1-T12, and the arrows indicate the direction in which the winding proceeds. The conductors that make up the U-phase winding are indicated by a solid line, the conductors that make up the V-phase winding are indicated by a dashed line, and the conductors that make up the W-phase winding are indicated by a dashed double-dot line. Note that the direction in which the winding proceeds does not necessarily match the direction in which the current flows.

[0036] Among the wires drawn out from slot S to the first end face side, the parts marked with the symbols U, V, and W indicate the parts of the conductor used as lead wires to connect to the power supply of the corresponding phase. These parts are not necessarily the ends of the conductor. The other ends of the wires drawn out from slot S to the first end face side indicate the parts of the conductor that will become neutral wires to connect to the neutral point. The portion where a horizontal line is drawn on the second end face side of each magnetic pole tooth T indicates a portion where a crossover wire L is formed in the conductor.

[0037] The lines drawn as if wound around the magnetic pole tooth T indicate the portions of the conductor that will become the coil C wound around the magnetic pole tooth T. For example, around the magnetic pole tooth T4 in Fig. 3A, for convenience of illustration, there are some portions where the lines are drawn just short of one revolution of the magnetic pole tooth T, but even this depiction indicates that the coil C is wound around the magnetic pole tooth T an appropriate number of revolutions.

[0038] 3A and 3B include the following features 1 to 3. In addition, the configuration is suitable for forming a star connection in which four coils C wound around one magnetic pole tooth T are connected in parallel for each phase. (Feature 1) The windings of each of the three phases have the same way of winding the conductors around the magnetic pole teeth T, and the circumferential positions of the stator core 10 differ by one magnetic pole tooth T. (Feature 2) Each of the three phase windings has a portion where a conductor is drawn out from one slot SX and returns to the same slot SX to form a drawn-out portion (X is a natural number from 1 to 12). (Feature 3) In each of the three phase windings, for at least one of the above-mentioned lead-out portions, the conductors on both sides of the lead-out portion (the front side and the rear side in the winding order) are fixed in the one slot SX by a conductor wound around one of the magnetic pole teeth T constituting the one slot SX after the lead-out portion is formed.

[0039] In the configuration of FIG. 3A, the U-phase winding is divided into a first portion 110U and a second portion 120U. Of these, the first portion 110U starts from an end wire 111U at the winding start end, is pulled into a slot S1 (first slot) adjacent to the magnetic pole tooth T1 from the first end face side, and is then wound counterclockwise (in a first direction) around the magnetic pole tooth T1 to form the coil C1. The length of the end wire 111U exposed outside the slot S1 is shown in the figure as being shorter than the height of the magnetic pole tooth T, but since the end wire 111U is used as a neutral wire as described below, it is formed to have a length sufficient for this purpose. This also applies to the other end wires unless otherwise specified. The first portion 110U is then led out to the second end face side of the slot S1, and is routed as a crossover wire L1U to the second end face side up to the position of the slot S3 (second slot) adjacent to the magnetic pole tooth T4.

[0040] The first portion 110U is then drawn into the slot S3 from the second end face side, and is led out from the first end face side without being wound around the magnetic pole tooth T, and is drawn out a predetermined length, and is then drawn into the slot S3 from the first end face side again. This portion from being drawn out from the first end face side of the slot S3 to being drawn into the slot S3 again forms the drawn-out portion 112U (first drawn-out portion) on the first end face side. The drawn-out portion 112U is shown in the figure to have a length shorter than the magnetic pole tooth T, but since the drawn-out portion 112U is used as a lead wire as described later, it is actually formed to have a length sufficient for this purpose. This point is the same for the other drawn-out portions unless otherwise specified.

[0041] The first portion 110U is further wound clockwise (second direction) around the magnetic pole tooth T4 to form the coil C4, which is then drawn out to a first end face side of the slot S4 (third slot) opposite to the slot S3 and adjacent to the magnetic pole tooth T4, to reach the winding termination end line 113U. The conductors on both sides of the drawn-out portion 112U are pressed against the magnetic pole tooth T4 and fixed in the slot S3 by winding the conductor of the coil C4, which is wound later, from above.

[0042] On the other hand, the second portion 120U starts from an end line 121U at the winding start end, is drawn into a slot S7 (fourth slot) adjacent to the magnetic pole tooth T7 from the first end face side, and then is wound counterclockwise around the magnetic pole tooth T7 to form a coil C7. After the second portion 120U is wound around the magnetic pole tooth T7, it is led out from a first end face of slot S6 (fifth slot) adjacent to the magnetic pole tooth T7 on the opposite side to slot S7, pulled out by a predetermined length, and then pulled back into slot S6 from the first end face. This portion from the first end face of slot S6 to the point where it is pulled back into slot S6 forms drawn-out portion 122U (second drawn-out portion) on the first end face side.

[0043] The second portion 120U is further led out to the second end face side of the slot S6, and is routed as a crossover wire L2U to the second end face side up to the position of the slot S10 (sixth slot) adjacent to the magnetic pole tooth T10. The second portion 120U is then pulled into the slot S10 from the second end face side and wound clockwise around the magnetic pole tooth T10 to form the coil C10, and then pulled out to the first end face side of the slot S10 to reach the winding termination end line 123U.

[0044] 3B, the V-phase winding is rotated clockwise (to the right in FIG. 3B) from the above U-phase winding by one magnetic pole tooth T when viewed from the perspective of FIG. 1, and the shape of the winding is the same as that of the U-phase winding. Similarly, the W-phase winding is rotated further from the V-phase winding by one magnetic pole tooth T, and the shape of the winding is the same as that of the U-phase and V-phase windings. 3B, among the V-phase and W-phase windings, parts corresponding to the parts of the U-phase winding that are given reference numerals are indicated by reference numerals in which the suffix "U" of the reference numerals used for the U-phase winding is changed to "V" and "W", respectively. In the following explanation, when referring to configurations corresponding to each phase indicated by reference numerals including "U", "V", or "W", without distinguishing between phases, the reference numerals without "U", "V", or "W" are used.

[0045] Next, with reference to FIGS. 4 and 5, wiring for manufacturing a motor using stator 1 having the windings shown in FIG. 3B will be described. FIG. 4 is a diagram for explaining the structure of a star connection that can be realized by the winding shown in FIG. 3B. FIG. 5 is a diagram for explaining the wiring work performed on the winding shown in FIG. 3B to form the star connection shown in FIG. 4. FIG. 5 shows from which positions of the stator core 10 the lead wires and neutral wires for the connection shown in FIG. 4 are drawn and how they are connected. FIG. 5 shows the side of the stator core 10 opposite to the side shown in FIG. 1 and FIG. 2. Therefore, the position of each coil C in the figure is upside down compared to FIG. 2. The insulating material 23 shown in FIG. 5 has an outer wall 24 at a position corresponding to the outer wall 14. It also has a magnetic pole tooth covering portion 27 that covers the magnetic pole teeth T like the magnetic pole tooth covering portion 17 (see also FIG. 6C).

[0046] 5, the neutral wire for connecting to the neutral point 60 is shown extending toward the center of the stator core 10, and the lead wires for connecting to the power source 50 of each phase (the reference symbol "50" is used when referring to the three-phase power source without distinguishing between them) are shown extending radially. This is done to make it easier to understand the position where each wire is pulled out from the stator core 10, and there is no need to wire each wire in the direction shown in the figure after it is pulled out. Each wire may be pulled out in any position as long as the connection topology is maintained, and may be bundled or fixed as appropriate using a connector or holder. 5, arc-shaped wiring is shown between the lead wires of the drawer section 112 and the power source 50, but this wiring is also for easily showing the topology of the connection between the lead wires and the power source 50 and is not essential. The lead wires and the power source 50 may be directly connected.

[0047] When manufacturing a motor using the stator 1 shown in FIG. 3B, it is assumed that a star connection will be formed in which four coils C wound around one magnetic pole tooth T are connected in parallel for each phase, as shown in FIG. 4. For the U-phase, the coils C1 and C4 can be connected in parallel by connecting the lead-out portion 112U to the U-phase power supply 50U and connecting the terminal wires 111U and 113U to the neutral point 60. In other words, the lead-out portion 112U can be used as a lead wire for connecting the two coils C1 and C4 to a common power supply, and the terminal wires 111U and 113U can be used as neutral wires.

[0048] In this case, the coil C1, which is located in front of the lead-out portion 112U in terms of the winding order, has a winding direction opposite to the connection direction as seen from the lead-out portion 112U. The coil C4, which is located behind the lead-out portion 112U, has a winding direction that is the same as the connection direction as seen from the lead-out portion 112U. Therefore, by reversing the winding directions of the coils C1 and C4, it is possible to flow current in the same direction (here, clockwise as seen from the center of the stator core 10) when energized.

[0049] As shown in FIG. 4, the wiring between U-phase power source 50U and coil C1 includes not only lead-out portion 112U but also crossover wire L1U. Furthermore, if the conductor in pull-out portion 112U is bent at the turn-around point so that the outgoing and return conductors are close to each other, the entire pull-out portion 112U can be easily inserted into an insulating tube from the turn-around point, and with a simple operation, almost the entire length of the lead wire can be insulated up to the vicinity of stator core 10.

[0050] There is a similar relationship between the lead-out portion 122U, the end wires 121U and 123U, the coils C7 and C10, and the crossover wire L2U. However, the crossover wire L2U is included in the wiring between the U-phase power source 50U and the coil C1 together with the lead-out portion 122U. This is because, in order to place the lead-out portion 112U and the lead-out portion 122U as close as possible to each other, the lead-out portion 112U is disposed on the right side in the figure in the first portion 110U, while the lead-out portion 122U is disposed on the left side in the figure in the second portion 120U.

[0051] By connecting the above-mentioned lead portions 112U, 122U together to a U-phase power supply 50U and connecting the terminal wires 111U, 113U, 121U, 123U together to a neutral point 60, the coils C1, C4, C7, C10 can be connected in parallel for the U-phase. For the V phase, the coils C2, C5, C8, and C11 can be connected in parallel by corresponding connections, and for the W phase, the coils C3, C6, C9, and C12 can be connected in parallel by corresponding connections.

[0052] For connection to the power source 50, two lead-out portions 112, 122 for each phase may be bundled together and connected to the power source 50 of that phase. This bundled portion corresponds to a lead portion for connection to the power source 50. The lead portion may be configured by connecting the two lead-out portions 112, 122 to a common connector. For the neutral point, all of the terminal wires 111, 113, 121, 123 for the three phases may be connected to a common neutral point 60.

[0053] As can be seen from FIG. 5, each neutral wire is drawn out from every slot S, and is arranged around the entire circumference of the stator core 10. However, the lead wires from the first portion 110 and the second portion 120 of all phases are drawn out only from six consecutive slots S (slots S3 to S8) on the upper side of the figure. Therefore, when collecting the three-phase lead wires for each phase, it is only necessary to extend one's hand to a position roughly halfway around the stator core 10 in order to grasp the drawn-out wires, and this can achieve high work efficiency, especially when wiring is done manually, compared to a case in which the lead wires are distributed evenly around the entire circumference. This effect is obtained by the above-mentioned (Feature 1) and (Feature 2).

[0054] Furthermore, since one pull-out portion functions as two lead wires that are already bundled together, the four coils C can be connected in parallel to the power source 50 simply by bundling the two pull-out portions 112, 122, which also provides high work efficiency. 3A and 3B, out of the lead wires 112 and 122, the lead wire 112 is formed and then wound with the coil C from above. Therefore, the conductors on both sides of the lead wire 112 are held down by the coil C, and the lead wire 112 is fixed to the stator core 10 within the slot S. This prevents the wire from moving relative to the stator core 10 near the exit of the slot S during wiring work, making it easy to handle the wiring. In this respect as well, the stator 1 having the winding structure described above allows wiring to be performed with high work efficiency. This corresponds to the above-mentioned (Feature 3). The above-mentioned improvement in work efficiency leads to an improvement in the manufacturing efficiency of rotating electrical machines such as motors.

[0055] In the configuration of Figures 3A and 3B, the lead-out portion 122 cannot be fixed in this manner because it is formed after winding the coil C. This is because priority is given to improving work efficiency by gathering all of the lead-out portions 112, 122 in positions as close as possible to each other in the circumferential direction of the stator core 10.

[0056] Next, an embodiment of a winding method for winding the winding having the structure described above will be described with reference to FIGS. 6A to 6D. Fig. 6A is a diagram showing the arrangement of nozzles in a winding machine for carrying out this winding method. Fig. 6B is a diagram showing the path of relative movement between the nozzle and the magnetic pole tooth T when winding a wire around each magnetic pole tooth T. Fig. 6C is a diagram showing the positional relationship between the nozzle and the pin while the crossover wire L is being formed. Fig. 6D is a diagram for explaining the procedure for forming the lead-out portion.

[0057] The winding of the first embodiment described above has the above-mentioned (Feature 1), and therefore when viewed as a whole three phases, the winding method of the conductor around the magnetic pole teeth T is common, and the winding has two sets of three parts at different circumferential positions of the stator core 10. Therefore, three-phase windings can be wound simultaneously by synchronously moving three nozzles that eject conductors relative to the stator core 10. The first portion 110 and the second portion 120 have partially different conductor winding methods, so they are wound separately.

[0058] In order to wind the three phases simultaneously, for example, as shown in Fig. 6A, it is possible to use a winding machine in which three nozzles 41U, 41V, and 41W are fixed to a common nozzle fixing part 40 and a wire conductor 43 can be discharged from each nozzle 41. Each nozzle 41 has an advance / retract mechanism 41Ua, 41Va, and 41Wa in the nozzle fixing part 40, and can advance / retract in a radial direction of the stator core 10 in a synchronized manner. In addition, by rotating or translating at least one of the nozzle fixing part 40 and the stator core 10 to be wound, each nozzle 41 can be moved in a synchronized manner relative to the stator core 10 in the circumferential direction (the direction of the arrow X in Fig. 6A) and the axial direction (the direction of the arrow Z in Fig. 6B).

[0059] In the following explanation, the nozzle 41 is described as moving, but the winding can be substantially the same as that described below by moving only the stator core 10 or by moving both the nozzle 41 and the stator core 10. In the following description, the term "circumferential direction" refers to 」 Unless otherwise specified, the terms "axial direction" and "radial direction" refer to stator core 10 which is the subject of winding.

[0060] Nozzles 41U, 41V, and 41W are nozzles for winding the U-phase, V-phase, and W-phase windings, respectively, and their circumferential positions differ from each other by one magnetic pole tooth T. This corresponds to the difference in the position of the windings of each phase. While the conductors 43 are being discharged from these three nozzles 41, the nozzles 41 are moved relative to the stator core 10 so as to circle around the magnetic pole teeth T as shown in FIG. 6B, whereby the coils C can be wound around the magnetic pole teeth T.

[0061] FIG. 6B shows an example in which winding is performed on the magnetic pole tooth T1 using the nozzle 41U. In this case, if winding is started from the slot S1 side, the nozzle 41U is placed in a radial position according to the position of the winding to be formed, translated in the axial direction and inserted into the slot S1, and after passing through the slot S1, rotated in the circumferential direction to the position of the slot S12 on the opposite side of the slot S1 as viewed from the magnetic pole tooth T1. Then, the nozzle 41U is translated in the axial direction and inserted into the slot S12, passed through the slot S12, and then rotated in the circumferential direction to the position of the slot S1. In this way, one turn of winding can be formed. By repeating this procedure while appropriately adjusting the radial position of the nozzle 41U, it is possible to wind the coil C1 with any number of turns on the magnetic pole tooth T1. The same can be done when winding is performed on another magnetic pole tooth T using another nozzle 41.

[0062] 6C is a schematic diagram of one side of the cross section of stator core 10 taken along a plane passing through the rotation axis, in which the lower side is the crossover wire forming side (second end face side). When forming a crossover wire L to connect to another magnetic pole tooth T after winding around one magnetic pole tooth T is completed, the nozzle 41 is moved, with the nozzle 41 on the crossover wire forming side (second end face side), to an axial position where it does not interfere with the pin 16 and a radial position where the conductor 43 to be discharged can be disposed radially outside the pin 16, as shown in Fig. 6C. In this state, the nozzle 41 is rotated in the circumferential direction to entangle the conductor 43 around the pin 16 and form the crossover wire L. When the nozzle 41 reaches the position of the magnetic pole tooth T where winding is to be performed next, it is sufficient to move the nozzle 41 to a position suitable for winding, as shown in Fig. 6B. In addition, the insulation between different crossover wires L may be strengthened by, for example, changing the axial position of each crossover wire L.

[0063] FIG. 6D shows a procedure for forming the lead-out portion 112U at the position of the slot S3, taking the U-phase first portion 110U as an example. In this case, the nozzle 41U is drawn out toward the first end face side of the slot S3, and then is further drawn out and moved in the axial direction a predetermined distance (a length sufficient for use as the lead wire described above). Thereafter, the conductor 43 is held by the conductor holding part 44 at a position where the conductor 43 should be folded back, and the nozzle 41U is moved in the axial direction by reversing the movement path up to that point, and is then inserted again into the same slot S3. In this manner, the drawn-out part 112 can be formed.

[0064] The conductor holding part 44 may be capable of gripping the conductor 43 like a clip, or may be capable of hanging the conductor 43 like a pin or a hook. It is not essential that it is movable. However, it is preferable that after the conductor holding part 44 holds the conductor 43, the drawn-out conductor 43 is moved slightly as shown by the arrow 44a to prevent interference between the nozzle 41U and the conductor 43 discharged therefrom and the drawn-out conductor 43 on the return path of the nozzle 41U. It is not essential that the movement path of the nozzle 41U outside the slot S is linear. It is also not essential that the movement path approximately coincides with the axial direction. If the movement path of the nozzle 41U is not linear, even if the conductor holding part 44 does not have a movement mechanism, it is possible to avoid interference between the conductors 43 by adjusting the movement path of the nozzle 41U.

[0065] The lead-out portions can be formed in the other locations in the same manner. When winding is performed simultaneously using three nozzles 41, the lead-out portions are also formed in three locations at the same time. However, the operation timing of the nozzles 41 and the locations other than the stator core 10, for example, the conductor holding portion 44, does not need to be the same for the three locations, and the movement amount as indicated by the arrow 44a does not need to be the same or the movement direction to be symmetrical.

[0066] As described above, the winding shown in Figures 3A and 3B can be formed by using a winding machine equipped with three nozzles 41 that can be driven synchronously, discharging the conductor 43, which is a wire rod, from the tip of the nozzle 41, while combining the formation of the coil C, the crossover wire L, and the lead-out portions 112, 122 described using Figures 6B to 6D, and moving the nozzle 41 relative to the stator core 10 so that the winding proceeds in the order shown in Figures 3A and 3B. However, winding in the reverse order can also be performed.

[0067] With this winding method, winding can be completed in approximately one-third the time compared to winding the conductors one by one, and the manufacturing efficiency of the stator 1 can be significantly improved. It is assumed that the first portion 110 and the second portion 120 of each phase are wound consecutively, but this is not essential. There may be another process between the winding of one of them and the winding of the other. Also, either the first portion 110 or the second portion 120 may be wound first.

[0068] In addition, it is preferable that the nozzle 41 (first nozzle) used for winding the first portion 110 of each phase and the nozzle 41 (second nozzle) used for winding the second portion 120 are common in terms of efficiency of the winding work, but this is not essential. It is not prevented to wind the first portion 110 and the second portion 120 using different nozzles. A procedure in which the first nozzle and the second nozzle are fixed to different nozzle fixing parts, and after winding of the first portion 110 is completed, the first nozzle is temporarily moved to a position away from the stator core 10, and in its place, the second nozzle is moved to a position close to the stator core 10 to wind the second portion 120 is also not excluded.

[0069] For comparison, another example of the arrangement of nozzles 41 in a winding machine is shown in Fig. 7. The example in Fig. 7 differs from the example in Fig. 6A only in the circumferential positional relationship of each nozzle 41, and the same reference numerals are used to designate parts corresponding to those in Fig. 6A. In the example of FIG. 7, the nozzles 41U, 41V, and 41W are positioned in the circumferential direction such that they differ from each other by two magnetic pole teeth T. The winding machine with the nozzle arrangement shown in FIG. 7 is suitable for forming windings in which the circumferential position of each of the three phases differs by two magnetic pole teeth T, unlike the winding shown in FIG. 3B.

[0070] As can be seen by comparing Fig. 7 with Fig. 6A, the configuration in Fig. 7 has more space to place the advancing and retracting mechanisms 41a than the configuration in Fig. 6A, because the advancing and retracting mechanisms 41a of adjacent nozzles 41 are positioned farther apart than in the configuration in Fig. 6A. In FIG. 7, the radial length of the advancing and retracting mechanisms 41a, 42a is the same as in the configuration of FIG. 6A, but it is possible to provide a longer advancing and retracting mechanism and to increase the radial movable range of the nozzles 41, 42.

[0071] Despite these circumstances, the winding configuration of FIG. 3B is designed so that the circumferential position of the windings for each of the three phases differs by one magnetic pole tooth T in order to allow the lead wires of each phase to be pulled out from positions closer together, taking into consideration the work efficiency when connecting the lead wires. As will be described later with reference to Fig. 13, if the windings in Fig. 3B are modified so that the circumferential positions of the windings for each of the three phases differ by two magnetic pole teeth T, the lead wires for the three phases will be distributed and drawn out over a wider range in the circumferential direction of stator core 10 than in the case of Fig. 3B. In that case, it will be necessary to reach over a wider range of stator core 10 to wire to power source 50, and work efficiency will be reduced compared to the arrangement described with reference to Fig. 5.

[0072] [First Modification of First Embodiment: Figs. 8 to 9B] Next, a first modified example of the first embodiment described above will be described with reference to Figs. 8 to 9A. The first modified example differs from the first embodiment only in that the winding proceeds in the opposite direction as viewed in the circumferential direction of the stator core 10 compared to that shown in Figs. 3A and 3B. Configurations that are common to or correspond to the first embodiment are designated by the same reference numerals as the first embodiment, and descriptions of common parts will be omitted as necessary. This also applies to the following modified examples and the second and subsequent embodiments.

[0073] FIG. 8 is a diagram corresponding to FIG. 1, for explaining the notation of each magnetic pole tooth in the first modified example. 8, the first modified example differs from the example in FIG 1 in that the reference symbols T1 to T12 of the magnetic pole teeth T are assigned in counterclockwise order from the first magnetic pole tooth T1, which is used as a convenient reference, to the twelfth magnetic pole tooth T12 as viewed from the second end face side. The structure of the stator core 10 is the same as in the example in FIG 1.

[0074] 9A and 9B are diagrams respectively showing the structure of windings in stator 1 of a first modified example, similar to FIGS. 3A and 3B. 9A and 9B, the order in which the magnetic pole teeth T are assigned the codes T1 to T12 is reversed from that in FIGS. 3A and 3B, and the magnetic pole teeth are arranged so that the numbers increase from right to left.

[0075] 3A and 3B in terms of into which slot S the winding is drawn, around which magnetic pole tooth T the winding is wound, and from which slot S the winding is drawn, and between which magnetic pole teeth T the crossover wire L is formed. Since the magnetic pole teeth T and slots S are labeled in the opposite direction to that in Fig. 1, Figs. 9A and 9B show a structure in which the winding proceeds in the opposite direction as viewed in the circumferential direction of the stator core 10 compared to Figs. 3A and 3B using the same reference numerals as in Figs. 3A and 3B. However, the winding direction of the conductor around each magnetic pole tooth T is opposite to that in Figures 3A and 3B. This corresponds to the winding proceeding in the reverse direction.

[0076] 9A, the first portion 110U starts from an end wire 111U at the winding start end, is pulled into the slot S1 (first slot) from the first end face side, and is then wound clockwise (first direction) around the magnetic pole tooth T1 to form the coil C1. The first portion 110U is then led out to the second end face side of the slot S1, and routed around the second end face side to the position of the slot S3 (second slot) as a crossover wire L1U, and after forming the lead-out portion 112 on the first end face side of the slot S3, the first portion 110U is wound counterclockwise (second direction) around the magnetic pole tooth T4 to form the coil C4, and is then led out to the first end face side of the slot S4 (third slot) to reach the end wire 113U at the winding end.

[0077] On the other hand, the second portion 120U starts from an end line 121U at the winding start end, is drawn into the slot S7 (fourth slot) from the first end face side, and is then wound clockwise around the magnetic pole tooth T7 to form the coil C7. After the second portion 120U has been wound around the magnetic pole tooth T7, it is subsequently led out from the first end face side of slot S6 (fifth slot) to form an extraction portion 122U, and then led out to the second end face side of slot S6 and pulled around as a crossover wire L2U to the second end face side up to the position of slot S10 (sixth slot). The second portion 120U is then pulled into the slot S10 from the second end face side and wound counterclockwise around the magnetic pole tooth T10 to form the coil C10, and then pulled out to the first end face side of the slot S10 to reach the end line 123U of the winding termination.

[0078] Such a winding also has the (Features 1) to (Features 3) described in the first embodiment, and like the winding of the first embodiment, three phases can be wound simultaneously. Also, it is possible to connect in the same star connection as in FIG. 4. However, the current direction of each of the coils C1 to C12 is the opposite to that in the first embodiment, being counterclockwise as viewed from the center of the stator core 10. The positions from which the lead wires and pull-out wires are pulled out are reversed from FIG. 5. That is, the range and how the lead wires and pull-out wires are pulled out in the circumferential direction of the stator core 10 are also similar to the winding of the first embodiment. Therefore, with the stator 1 and the winding method thereof according to the first modified example, the same effects as those obtained with the configuration of the first embodiment described above can be obtained.

[0079] [Second Modification of First Embodiment: Figs. 10A to 11] Next, a second modified example of the first embodiment will be described with reference to Fig. 10A to Fig. 11. The second modified example differs from the first embodiment only in that the winding direction of the conductor around each magnetic pole tooth T is reversed from that of the first embodiment, and the position of the slot through which the conductor passes is accordingly changed.

[0080] 10A and 10B are diagrams respectively showing the structure of windings in stator 1 of a second modified example, similar to FIGS. 3A and 3B. In the second variant, as shown in FIG. 10A, the U-phase first portion 110U starts from an end line 111U at the winding start point, is pulled into a slot S12 (first slot) adjacent to the magnetic pole tooth T1 from the first end face side, and is then wound clockwise (first direction) around the magnetic pole tooth T1 to form a coil C1. The first portion 110U is then led out to the second end face side of the slot S12, and is routed as a crossover wire L1U to the second end face side up to the position of the slot S4 (second slot) adjacent to the magnetic pole tooth T4.

[0081] The first portion 110U is then pulled into the slot S4 from the second end face side, and without being wound around the magnetic pole tooth T, is led out from the first end face side and pulled out a predetermined length, and then is pulled into the slot S4 again from the first end face side to form the pulled-out portion 112U. The first portion 110U is then wound counterclockwise (second direction) around the magnetic pole tooth T4 to form the coil C4, and then pulled out to the first end face side of the slot S3 (third slot) opposite the slot S4, adjacent to the magnetic pole tooth T4, to reach the end line 113U of the winding termination.

[0082] On the other hand, the second portion 120U starts from an end line 121U at the winding start end, is drawn into a slot S6 (fourth slot) adjacent to the magnetic pole tooth T7 from the first end face side, and is then wound clockwise around the magnetic pole tooth T7 to form a coil C7. After the second portion 120U has been wound around the magnetic pole tooth T7, it is subsequently led out from the first end face side of slot S7 (fifth slot) opposite slot S6 and adjacent to the magnetic pole tooth T7, pulled out a predetermined length, and then pulled back into slot S7 from the first end face side to form the pulled-out portion 122U.

[0083] The second portion 120U is further led out to the second end face side of the slot S7, and is routed as a crossover wire L2U to the second end face side up to the position of the slot S9 (sixth slot) adjacent to the magnetic pole tooth T10. The second portion 120U is then pulled into the slot S9 from the second end face side and wound counterclockwise around the magnetic pole tooth T9 to form the coil C10, and then pulled out to the first end face side of the slot S9 to reach the winding termination end line 123U.

[0084] Such a winding also has the (Features 1) to (Features 3) described in the first embodiment, and like the winding of the first embodiment, three phases can be wound simultaneously. Also, it is possible to connect in the same star connection as in Fig. 4. However, the current flow direction of each of the coils C1 to C12 is the opposite to that of the first embodiment, that is, counterclockwise as viewed from the center of the stator core 10.

[0085] FIG. 11 shows the lead-out positions and possible connection state of the lead wires and neutral wire in the winding of the second modified example, similar to FIG. As can be seen from FIG. 11, each neutral wire is arranged around the entire circumference of the stator core 10, but as in the case of FIG. 5, the lead wires from the first portion 110 and the second portion 120 of all phases are drawn out only from six consecutive slots S (slots S4 to S9) on the upper side of the figure. Therefore, with the stator 1 and the winding method thereof according to the second modified example, the same effects as those obtained with the configuration of the first embodiment described above can be obtained.

[0086] [Third Modification of First Embodiment: Figs. 12A and 12B] Next, a third modified example of the first embodiment described above will be described with reference to Figures 12A and 12B. The first modified example is different from the second modified example of the first embodiment only in that the winding proceeds in the opposite direction as viewed in the circumferential direction of the stator core 10 compared to that shown in Figures 10A and 10B. That is, the notation of the magnetic pole teeth T follows Figure 8, as in the first modified example.

[0087] 12A and 12B are diagrams respectively showing the structure of windings in stator 1 of a third modified example, similar to FIGS. 3A and 3B. 11A and 11B, the points of which slot the winding is pulled into, which magnetic pole tooth T it is wound around, and which slot the winding is pulled out from, and the points of which magnetic pole tooth T the crossover wire L is formed toward are the same as those in the second modified example shown in Figures 11A and 11B. Since the magnetic pole teeth T and slots S are labeled in the opposite direction to that in Figure 1, Figures 12A and 12B show a structure in which the winding proceeds in the opposite direction as viewed in the circumferential direction of stator core 10 compared to Figures 10A and 10B, using the same reference numerals as in Figures 10A and 10B. However, the winding direction of the conductor around each magnetic pole tooth T is opposite to that in Figures 10A and 10B. This corresponds to the winding proceeding in the reverse direction.

[0088] 12A, the first portion 110U starts from an end wire 111U at the winding start point, is pulled into the slot S12 (first slot) from the first end face side, and is then wound counterclockwise (first direction) around the magnetic pole tooth T1 to form the coil C1. The first portion 110U is then led out to the second end face side of the slot S12, and routed around the second end face side to the position of the slot S4 (second slot) as a crossover wire L1U, and after forming the lead-out portion 112 on the first end face side of the slot S4, the first portion 110U is wound clockwise (second direction) around the magnetic pole tooth T4 to form the coil C4, and is then led out to the first end face side of the slot S3 (third slot) to reach the end wire 113U at the winding end point.

[0089] On the other hand, the second portion 120U starts from an end line 121U at the winding start end, is drawn into the slot S6 (fourth slot) from the first end face side, and is then wound counterclockwise around the magnetic pole tooth T7 to form the coil C7. After the second portion 120U has been wound around the magnetic pole tooth T7, an extractor portion 122U is formed on the first end face side of slot S7 (fifth slot), and then the extractor portion 122U is led out to the second end face side of slot S7 and pulled around as a jumper wire L2U to the second end face side up to the position of slot S9 (sixth slot). The second portion 120U is then pulled into the slot S9 from the second end face side, wound clockwise around the magnetic pole tooth T9 to form a coil C10, and pulled out to the first end face side of the slot S9 to reach an end line 123U at the winding termination.

[0090] Such a winding also has the (Features 1) to (Features 3) described in the first embodiment, and like the winding of the first embodiment, three phases can be wound simultaneously. Also, it is possible to connect in the same star connection as in FIG. 4. The current direction of each of the coils C1 to C12 is clockwise, like the first embodiment. The positions from which the lead wires and pull-out wires are pulled out are reversed from those in FIG. 11. That is, the extent to which the lead wires and pull-out wires are pulled out in the circumferential direction of the stator core 10 and how they are pulled out are also similar to the winding of the second modified example. Therefore, with the stator 1 and the winding method thereof according to the third modified example, the same effects as those obtained with the configurations of the first embodiment and each of the modified examples described above can be obtained.

[0091] (Fourth Modification of the First Embodiment: FIG. 13) Next, a fourth modified example of the first embodiment described above will be described with reference to Fig. 13. The fourth modified example differs from the windings of the first embodiment shown in Figs. 3A and 3B only in that the circumferential positions of the windings of each phase on the stator core 10 differ by two magnetic pole teeth T. The winding of the fourth modification has the above-mentioned (Feature 2) and (Feature 3), but does not have (Feature 1).

[0092] FIG. 13 is a diagram showing the structure of windings in stator 1 of the fourth modified example, similar to FIG. 3B. 13, in the U-phase first portion 110U, the end wire 111U at the winding start end is drawn into slot S1 and is wound around the magnetic pole tooth T1 first, while in the V-phase first portion 110V, the end wire 111V is drawn into slot S3, which is two magnetic pole teeth T away, and is wound around the magnetic pole tooth T3 first. Similarly, in the W-phase first portion 110W, the end wire 111W is drawn into slot S5, which is another two magnetic pole teeth T away, and is wound around the magnetic pole tooth T5 first.

[0093] In addition, in the U-phase second portion 120U, the end wire 121U at the winding start end is drawn into slot S7 and is first wound around the magnetic pole tooth T7, while in the V-phase second portion 120V, the end wire 121V is drawn into slot S9, which is two magnetic pole teeth T away, and is first wound around the magnetic pole tooth T9. Similarly, in the W-phase second portion 120W, the end wire 121W is drawn into slot S11, which is another two magnetic pole teeth T away, and is first wound around the magnetic pole tooth T11. The structures of the first portion 110U and the second portion 120U are the same as those shown in FIG. 3A.

[0094] With this arrangement, as described with reference to FIG. 7, it is possible to provide ample space for arranging the nozzle 41 and its advance / retract mechanism 41a for winding the three phases simultaneously. However, as can be seen from FIG. 13, the range over which each lead wire, 112, 122, is pulled out, is eight slots (slots S3 to S10), which is wider than the six slots shown in FIG. 5, and the wiring work efficiency is lower than that of the configuration in FIG. 3B.

[0095] As described above, the configuration of FIG. 3B and the configuration of FIG. 13 have different advantages and disadvantages depending on the viewpoint, so which one is preferable to adopt depends on the design concept and important factors of the winding machine, the stator 1, and even the rotating electric machine using the stator 1. It should be noted that modifications similar to the fourth modified example can be applied not only to the first embodiment but also to the first to third modified examples thereof.

[0096] [Second embodiment: Figs. 14A to 16] Next, a second embodiment of the present invention will be described with reference to FIGS. 14A to 16. FIG. The second embodiment differs from the first embodiment in that the winding structure of the stator 1 is based on a star connection in which two coils C are wound in parallel for each phase, the coils C being wound in series around two magnetic pole teeth. The other aspects are the same as those of the first embodiment, including the configuration of the stator core 10.

[0097] 14A and 14B are diagrams respectively showing the winding structure of the stator 1 of the second embodiment in the same manner as in Fig. 3A and 3B. The winding structure of this second embodiment also has (Feature 1) to (Feature 3) described in the first embodiment, and can wind three phases simultaneously as in the first embodiment. In the second embodiment, the winding for each phase is not divided into multiple parts as in the first embodiment, but is formed from a single conductor. This winding for one phase is indicated by a reference symbol such as "110U." In the winding of the second embodiment, as shown in FIG. 14A, the U-phase winding 110U starts from an end line 111U at the winding starting point, is pulled into a slot S1 (first slot) adjacent to the magnetic pole tooth T1 from the first end face side, and is then wound counterclockwise (first direction) around the magnetic pole tooth T1 to form a coil C1.

[0098] The winding 110U is then led out to the second end face side of the slot S1, and is routed as a crossover wire L1U to the second end face side up to the position of the slot S3 (second slot) adjacent to the magnetic pole tooth T4. The winding 110U is then drawn into the slot S3 from the second end face side and wound counterclockwise around the magnetic pole tooth T4 to form the coil C4. After the winding around the magnetic pole tooth T4 is completed, the first portion 110U is led out to the second end face side of the slot S4 (third slot) adjacent to the magnetic pole tooth T4 and opposite the slot S3, and is routed as a crossover wire L2U to the second end face side up to the position of the slot S6 (fourth slot) adjacent to the magnetic pole tooth T7.

[0099] The winding 110U is then pulled into the slot S6 from the second end face side, and without being wound around the magnetic pole tooth T, is led out from the first end face side and pulled out a predetermined length, and then is pulled into the slot S6 again from the first end face side to form the pull-out portion 112U. The winding 110U is then wound clockwise (in a second direction) around the magnetic pole tooth T7 to form the coil C7. The conductors on both sides of the lead-out portion 112U are pressed against the magnetic pole tooth T7 and fixed in the slot S6 by the conductor of the coil C7, which is wound later, being wound from above.

[0100] After winding around the magnetic pole tooth T7, the winding 110U is subsequently led out to the second end face side of the slot S6 and is routed as a crossover wire L2U to the second end face side up to the position of the slot S10 (fifth slot) adjacent to the magnetic pole tooth T10. The winding 110U is then drawn into the slot S10 from the second end face side and wound clockwise around the magnetic pole tooth T10 to form a coil C10, and then drawn out to the first end face side of the slot S10 to reach an end wire 113U at the winding termination.

[0101] Also, as shown in FIG. 14B, the V-phase and W-phase windings 110V, 110W are located at positions rotated one and two magnetic pole teeth T clockwise (to the right in FIG. 14B) from the perspective of the U-phase winding 110U described above, and have the same shape as the U-phase winding 110U.

[0102] Moreover, Fig. 15 is a diagram corresponding to Fig. 4, and is used to explain the structure of star connection that can be realized by the winding shown in Fig. 14B. Fig. 16 is a diagram corresponding to Fig. 5, and is used to explain the wiring work performed on the winding shown in Fig. 14B to form the star connection shown in Fig. 15. When manufacturing a motor using the stator 1 shown in FIG. 14B, it is assumed that a star connection will be formed in which two circuits, each of which has two coils C wound around one magnetic pole tooth T connected in series, are connected in parallel for each phase, as shown in FIG. 15.

[0103] For the U-phase, by connecting the lead-out portion 112U to the U-phase power supply 50U and the terminal wires 111U and 113U to the neutral point 60, the coils C4 and C1 are connected in series, the coils C7 and C10 are connected in series, and these two series circuits are further connected in parallel. The direction of current flow is the same in all the coils C (here, clockwise when viewed from the center of the stator core 10).

[0104] That is, the lead-out portion 112U can be used as a common lead wire for the two series circuits, and the terminal wires 113U, 113U can be used as neutral wires. The wiring between the U-phase power source 50U and the coil C4 includes not only the lead-out portion 112U but also the crossover wire L2U. The crossover wire L1U functions as a connection between the coils C1 and C4, and the crossover wire L3U functions as a connection between the coils C7 and C10.

[0105] For the V phase, a circuit in which coils C5 and C2 are connected in series can be connected in parallel to a circuit in which coils C8 and C11 are connected in series, and for the W phase, a circuit in which coils C6 and C3 are connected in series can be connected in parallel to a circuit in which coils C9 and C12 are connected in series, using a corresponding connection.

[0106] To connect to the power source 50, one lead-out portion 112 for each phase may be connected to the power source 50 for that phase. If the conductor constituting the lead-out portion 112 is folded at an appropriate folding point so that the outgoing and return conductors are close to each other, the entire lead-out portion 112U can be easily inserted into an insulator tube from the folding point, and almost the entire length of the lead wire up to the vicinity of the stator core 10 can be insulated with a simple operation.

[0107] Furthermore, if this turn-around point is used as a lead portion for connecting to the U-phase power supply 50U, the lead wires for the two series circuits connected in parallel are already bundled together at the end of the winding and exist as a lead portion, eliminating the need to bundle multiple wires together, making the wiring work extremely easy. Also, a lead portion may be formed by connecting an appropriate portion of the lead portion 112 to a connector. As for the neutral point, all six terminal wires for the three phases may be connected to a common neutral point 60.

[0108] As can be seen from FIG. 16, the lead wires are drawn out only from three consecutive slots S (slots S6 to S8) on the upper side of the figure. Therefore, in order to connect the three-phase lead wires to the power source 50 for each phase, it is only necessary to extend one's hand to a position corresponding to approximately 1 / 6 of the circumference of the stator core 10, thereby achieving higher wiring work efficiency than in the first embodiment. As described above, in the second embodiment, high work efficiency can be achieved in that there is no need to group the lead wires by phase. This effect is obtained by the (Feature 1) and (Feature 2) described so far.

[0109] The neutral wire is also drawn only from six consecutive slots S (S10 to S3) on the lower side in the figure. Therefore, in order to connect the three-phase neutral wires to the neutral point 60, it is only necessary to reach a position slightly less than halfway around the stator core 10, which also contributes to achieving high wiring work efficiency.

[0110] 14A and 14B, the lead wire 112 is fixed to the stator core 10 in the slot S by the coil C, which has conductors on both sides wound from above, as in the first embodiment. Therefore, as in the first embodiment, the effect of facilitating wiring during wiring work is obtained. This corresponds to the feature 3 explained above. The terminal wire 111 is also fixed in the slot S, and is similarly easy to handle.

[0111] [Modification of the second embodiment: Figs. 17A to 18] Next, a modified example of the second embodiment will be described with reference to Fig. 17A to Fig. 18. This modified example differs from the second embodiment only in that the winding direction of the conductor around each magnetic pole tooth T is reversed from that of the second embodiment, and the position of the slot S through which the conductor passes is accordingly changed.

[0112] 17A and 17B are diagrams showing the winding structure of stator 1 of this modified example, similar to FIGS. 3A and 3B, respectively. In this modified example, the U-phase winding 110U starts from an end wire 111U at the winding starting point, is pulled into a slot S12 (first slot) adjacent to the magnetic pole tooth T1 from the first end face side, and is then wound clockwise (first direction) around the magnetic pole tooth T1 to form a coil C1, as shown in FIG.

[0113] The winding 110U is then led out to the second end face side of the slot S12, and is routed as a crossover wire L1U to the second end face side up to the position of the slot S4 (second slot) adjacent to the magnetic pole tooth T4. The winding 110U is then drawn into the slot S4 from the second end face side and wound clockwise around the magnetic pole tooth T4 to form the coil C4. After the first portion 110U is wound around the magnetic pole tooth T4, it is led out to the second end face side of the slot S3 (third slot) adjacent to the magnetic pole tooth T4 and opposite the slot S4, and is routed as a crossover wire L2U to the second end face side up to the position of the slot S7 (fourth slot) adjacent to the magnetic pole tooth T7.

[0114] The winding 110U is then pulled into the slot S7 from the second end face side, and without being wound around the magnetic pole tooth T, is led out from the first end face side and pulled out a predetermined length, and then is pulled back into the slot S7 from the first end face side again, thereby forming the pull-out portion 112U. The winding 110U is then wound counterclockwise (in a second direction) around the magnetic pole tooth T7 to form the coil C7. The conductors on both sides of the lead-out portion 112U are pressed against the magnetic pole tooth T7 and fixed in the slot S7 by the conductor of the coil C7, which is wound later, being wound from above.

[0115] After winding around the magnetic pole tooth T7, the winding 110U is subsequently led out to the second end face side of the slot S7 and is routed as a crossover wire L2U to the second end face side up to the position of the slot S9 (fifth slot) adjacent to the magnetic pole tooth T10. The winding 110U is then drawn into the slot S9 from the second end face side and wound clockwise around the magnetic pole tooth T10 to form the coil C10, and then drawn out to the first end face side of the slot S9 to reach the winding termination end wire 113U.

[0116] Such a winding also has the (Features 1) to (Features 3) described above, and like the windings of the first and second embodiments, three phases can be wound simultaneously. Also, it is possible to connect in the same star connection as in Fig. 15. However, the current flow direction of each of the coils C1 to C12 is the opposite to that of the second embodiment, that is, counterclockwise as viewed from the center of the stator core 10.

[0117] FIG. 18 shows the lead-out positions of the lead wires and neutral wire in the winding of this modified example and an assumed connection mode, similar to FIG. As can be seen from Fig. 18, similarly to Fig. 16, the lead wires are drawn out only from the three consecutive slots S (slots S7 to S8) on the upper side of the figure, and the neutral wire is drawn out only from the six consecutive slots S (slots S9 to S2) on the lower left side of the figure. Therefore, with the stator 1 and the winding method thereof of this modified example, the effect of improving work efficiency can be obtained similarly to the configuration of the second embodiment described above.

[0118] As another modification, it is possible to modify the winding configuration of the second embodiment and its modification described above in such a way that the winding proceeds in the reverse direction as viewed in the circumferential direction of the stator core 10, as explained in the first and third modifications of the first embodiment. Even with such a modified configuration, the same effects as the configuration before modification can be obtained, as explained in the first and third modifications of the first embodiment. Also, as explained in the fourth modified example of the first embodiment, it is possible to apply a modification in which the circumferential positions of the windings of each phase on the stator core 10 differ by two magnetic pole teeth T. However, when this modification is applied to the second embodiment, the efficiency of wiring work decreases not only for the lead wires but also for the neutral wire, so the effect of making the difference in position by one magnetic pole tooth T is greater than that of the first embodiment.

[0119] [Third embodiment: Figs. 19A to 21] Next, a third embodiment of the present invention will be described with reference to FIGS. 19A to 21. The third embodiment differs from the first embodiment in that the winding structure of the stator 1 is such that two coils C are wound in series around two adjacent magnetic pole teeth, and two coils C are connected in parallel for each phase, and the series-wound coils C are assumed to be star-connected in which the winding direction differs for each magnetic pole tooth. The other points, including the configuration of the stator core 10, are the same as those of the first embodiment.

[0120] 19A and 19B are diagrams respectively showing the winding structure of the stator 1 of the third embodiment in the same manner as in Figs. 3A and 3B. The winding structure of this third embodiment also has (Feature 1) and (Feature 2) described in the first embodiment, and can wind three phases simultaneously as in the first embodiment. However, since the circumferential positions of the windings of each phase differ by two magnetic pole teeth T, the arrangement of the nozzles 41 shown in Fig. 7 is used. Also, in the third embodiment, the windings of each phase are not divided into multiple parts as in the first embodiment, but are formed from a single conductor. This winding for one phase is indicated by a reference symbol such as "110U".

[0121] In the winding of the third embodiment, as shown in FIG. 19A, the U-phase winding 110U starts from an end line 111U at the winding starting point, is pulled into a slot S12 (first slot) adjacent to the magnetic pole tooth T1 from the first end face side, and is then wound clockwise (first direction) around the magnetic pole tooth T1 to form a coil C1.

[0122] The winding 110U is then wound counterclockwise (in the second direction) around the adjacent magnetic pole tooth T2 to form the coil C2. There need not be a clear boundary between the coils C2 and C1, and it is sufficient that there is an appropriate transition within the slot S1. Therefore, no crossover wire is formed at this location. The winding 110U finishes winding around the magnetic pole tooth T2 in slot S2 (second slot) adjacent to the magnetic pole tooth T2, is led out to the second end face side of slot S2, and is pulled as a jumper wire L1U to the second end face side to the position of slot S6 (third slot) adjacent to the magnetic pole tooth T7.

[0123] The winding 110U is then pulled into the slot S6 from the second end face side, and without being wound around the magnetic pole tooth T, is led out from the first end face side and pulled out a predetermined length, and then is pulled into the slot S6 again from the first end face side to form the pull-out portion 112U. The winding 110U is then wound clockwise around the magnetic pole tooth T7 to form the coil C7. The conductors on both sides of the lead-out portion 112U are pressed against the magnetic pole tooth T7 and fixed in the slot S6 by the conductor of the coil C7, which is wound later, being wound from above.

[0124] The winding 110U is then wound counterclockwise around the adjacent magnetic pole tooth T8 to form a coil C8, and then finishes winding around the magnetic pole tooth T8 in slot S7 (fourth slot) adjacent to the magnetic pole tooth T8, and is then pulled out to the first end face side of slot S7, reaching an end wire 113U at the end of the winding. There may also not be a clear boundary between coils C7 and C8, as long as there is an appropriate transition within slot S7. Therefore, no crossover is formed at this location either.

[0125] Also, as shown in FIG. 19B, the V-phase and W-phase windings 110V, 110W are located at positions rotated clockwise (to the right in FIG. 19B) from the above-mentioned U-phase winding 110U by two and four magnetic pole teeth T, respectively, and their shapes are the same as those of the U-phase winding 110U. In the winding of the third embodiment, since the winding 110 is wound around two adjacent magnetic pole teeth T, the winding of each phase needs to be shifted in the circumferential direction by two magnetic pole teeth T instead of one.

[0126] Moreover, Fig. 20 is a diagram corresponding to Fig. 4 and is used to explain the structure of a star connection that can be realized by the winding shown in Fig. 19B. Fig. 21 is a diagram corresponding to Fig. 5 and is used to explain the wiring work performed on the winding shown in Fig. 19B to form the star connection shown in Fig. 20.

[0127] When manufacturing a motor using the stator 1 shown in Fig. 19B, it is assumed that a star connection is formed in which two coils C wound around one magnetic pole tooth T are connected in series, and two coils C are connected in parallel for each phase, as shown in Fig. 20. In addition, since the two coils C connected in series are wound around adjacent magnetic pole teeth T, the current flows in opposite directions to suppress the effects of self-induction. Also, it is assumed that a 12-pole stator such as Stator 1 will be used mainly in combination with a 10-pole rotor. In this case, of the 10 permanent magnets embedded in the rotor, two opposing magnets will have opposite magnetic properties, so to match this, coils C such as C1 and C7, which are located 180° apart in the circumferential direction, also have their current flowing in the opposite direction.

[0128] "CW" and "CCW" in FIG. 20 are symbols that indicate whether the direction of the current flowing from the power supply 50 to the neutral point 60 when viewed from the center of the stator core 10 is clockwise (CW) or counterclockwise (CCW). 20, for the U phase, by connecting the lead-out portion 112U to the U-phase power supply 50U and the terminal wires 111U and 113U to the neutral point 60, the coils C2 and C1 are connected in series, the coils C7 and C8 are connected in series, and these two series circuits are connected in parallel. In other words, the lead-out portion 112U can be used as a lead wire, and the terminal wires 111U and 113U can be used as neutral wires.

[0129] For the V phase, a circuit in which coils C4 and C3 are connected in series can be connected in parallel to a circuit in which coils C9 and C10 are connected in series, and for the W phase, a circuit in which coils C6 and C5 are connected in series can be connected in parallel to a circuit in which coils C11 and C12 are connected in series, using a corresponding connection.

[0130] The connection to the power source 50 can be achieved by connecting one lead portion 112 for each phase to the power source 50 of that phase as a lead wire. This makes it possible to very easily perform the wiring work of the lead wires, as in the second embodiment. Regarding the neutral point 60, similarly to the second embodiment, all of the terminal wires 111 and 113 for the three phases, that is, a total of six, may be connected to the common neutral point 60.

[0131] As can be seen from FIG. 21, the lead wires are drawn out only from the range of five consecutive slots S (slots S6 to S10) on the upper left side of the figure. Therefore, in order to connect the three-phase lead wires to the power source 50 for each phase, it is only necessary to extend the hand to a position corresponding to approximately 1 / 3 of the circumference of the stator core 10, which is slightly inferior to the second embodiment, but achieves higher wiring work efficiency than the first embodiment. Also, as with the second embodiment, high work efficiency can be achieved in that there is no need to bundle the lead wires for each phase. This effect is obtained by the (Feature 1) and (Feature 2) described so far.

[0132] 19A and 19B, the conductors on both sides of the lead wire 112 are fixed to the stator core 10, as in the second embodiment, and this provides the advantage of facilitating wiring. This corresponds to the feature 3 described above.

[0133] On the other hand, although the neutral wire has some dense and sparse areas, it is drawn out from almost the entire circumference of the stator core 10. This is unavoidable due to the constraint of using coils wound in series around two adjacent magnetic pole teeth, and this embodiment proposes a configuration that can improve the efficiency of the wiring work of the lead wire even under this constraint, and can achieve the effect of speeding up the winding process.

[0134] (Modification of the third embodiment: Figs. 22A to 23) Next, a modified example of the third embodiment will be described with reference to Fig. 22A to Fig. 23. This modified example differs from the second embodiment only in that the winding direction of the conductor around each magnetic pole tooth T is reversed from that of the third embodiment, and the position of the slot S through which the conductor passes is accordingly changed.

[0135] 22A and 22B are diagrams showing the winding structure of stator 1 of this modified example, similar to FIGS. 3A and 3B, respectively. In this modified example, the U-phase winding 110U begins from an end line 111U at the winding starting point, is pulled into a slot S1 (first slot) adjacent to the magnetic pole tooth T1 from the first end face side, and is then wound counterclockwise (first direction) around the magnetic pole tooth T1 to form a coil C1, as shown in FIG.

[0136] The winding 110U is then wound clockwise (in the second direction) around the adjacent magnetic pole tooth T2 to form the coil C2. There need not be a clear boundary between the coil C2 and the coil C1, and it is sufficient that there is an appropriate transition within the slot S1. Therefore, no crossover wire is formed at this location. The winding 110U finishes winding around the magnetic pole tooth T2 in the slot S1 (second slot) adjacent to the magnetic pole tooth T2, is led out to the second end face side of the slot S1, and is pulled as a jumper wire L1U to the second end face side to the position of the slot S7 (third slot) adjacent to the magnetic pole tooth T7.

[0137] The winding 110U is then pulled into the slot S7 from the second end face side, and without being wound around the magnetic pole tooth T, is led out from the first end face side and pulled out a predetermined length, and then is pulled back into the slot S7 from the first end face side again, thereby forming the pull-out portion 112U. The winding 110U is then wound counterclockwise around the magnetic pole tooth T7 to form the coil C7. The conductors on both sides of the lead-out portion 112U are pressed against the magnetic pole tooth T7 and fixed in the slot S6 by the conductor of the coil C7, which is wound later, being wound from above.

[0138] The winding 110U is then wound clockwise around the adjacent magnetic pole tooth T8 to form a coil C8, and then the winding around the magnetic pole tooth T8 is completed in the slot S8 (fourth slot) adjacent to the magnetic pole tooth T8, and the winding is then pulled out to the first end face side of the slot S8, reaching the end wire 113U at the end of the winding. There may also not be a clear boundary between coils C7 and C8, as long as there is an appropriate transition within slot S7. Therefore, no crossover is formed at this location either.

[0139] Such a winding also has the (Features 1) to (Features 3) described above, and like the windings of the first to third embodiments, three phases can be wound simultaneously. Also, it is possible to connect in the same star connection as in Fig. 20. However, the current flow direction of each of the coils C1 to C12 is reverse to that shown in Fig. 20.

[0140] FIG. 23 shows the lead-out positions of the lead wires and neutral wire in the winding of this modified example and an assumed connection mode, similar to FIG. As can be seen from FIG. 23, in the configuration of this modification, similarly to the case of FIG. 21, the lead wires are drawn out only from the range of five consecutive slots S (slots S7 to S11) on the upper left side of the figure. Therefore, with the stator 1 and the winding method thereof of this modified example, the effect of improving work efficiency can be obtained similarly to the configuration of the third embodiment described above.

[0141] 22A and 22B, in the winding of the second modified example, each jumper wire L has a length that spans approximately six magnetic pole teeth T. On the other hand, in the winding shown in FIGS. 19A and 19B, each jumper wire L has a length that spans approximately four magnetic pole teeth T. In general, from the standpoint of ease of insulation and noise prevention, it is preferable that the crossover wire L is short. In this respect, it can be said that the winding of the third embodiment described above is more preferable than the winding of this modified example.

[0142] As another modification, it is possible to modify the winding configuration of the third embodiment and its modification described above in such a way that the winding proceeds in the reverse direction as viewed in the circumferential direction of the stator core 10, as explained in the first and third modifications of the first embodiment. Even with such a modified configuration, the same effects as the configuration before modification can be obtained, as explained in the first and third modifications of the first embodiment.

[0143] Although the preferred embodiment and some modified examples of the present invention have been described above, the present invention is not limited to such specific embodiments and modified examples, and various further modifications and alterations are possible.

[0144] For example, in the above-described embodiment, the windings of the three phases, U-phase, V-phase, and W-phase, are arranged in this order at positions that differ by one or two magnetic pole teeth T in the winding progression direction (for example, to the right in the examples of FIGS. 3A and 3B). However, the arrangement order of the three phases may be changed. The specific shape and size of the stator core 10 are not limited to those described in the respective embodiments. In particular, the insulating material 13 may be provided with a structure for positioning the crossover wire L, the lead wires, and the neutral wire.

[0145] Furthermore, the configurations of the above-mentioned embodiments of the present invention may be implemented by taking out only a part of them, and the configurations described in the above description may be applied in any combination as long as they are not mutually contradictory. The effects described in the embodiments of the present invention are merely examples of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments of the present invention. [Explanation of symbols]

[0146] 1... stator, 10... stator core, 11... annular portion, 13, 23... insulating material, 14, 24... outer wall, 15... jumper arrangement portion, 16... pin, 17, 27... magnetic pole tooth covering portion, 31... rotating shaft, 32... rotor, 40... nozzle fixing portion, 41... nozzle, 41a... advancement and retreat mechanism, 43... conductor, 44... conductor holding portion, 50... power source, 60... neutral point, 110... first portion (winding), 111, 113... end wire of first portion (winding), 112... lead-out portion of first portion (winding), 120... second portion, 121, 123... end wire of second portion, 122... lead-out portion of second portion, C (C1 to C12)... coil, L, L1, L2... jumper, S (S1 to S12)... slot, T (T1 to T12)... magnetic pole tooth (The letters "U", "V", and "W" have been added to the symbols to indicate the configuration of the U, V, and W phases, as appropriate.)

Claims

1. a stator core having 12 magnetic pole teeth at equal angular intervals on its inner periphery and having slots between each of the magnetic pole teeth; a winding for each of three phases formed by a conductor wound around the twelve magnetic pole teeth of the stator core, a stator characterized in that each of the windings of each phase has at least one location where the conductor is pulled out from one of the slots to form a pull-out portion and then returns to the one of the slots, and the conductors on both sides of the pull-out portion are fixed within the one of the slots by a conductor wound around one of the magnetic pole teeth that constitute the one of the slots after the pull-out portion is formed.

2. 2. The stator according to claim 1, The windings of each phase are configured so that wiring can be used to connect four coils in parallel, each coil being wound around one of the magnetic pole teeth, A stator characterized in that all of the lead portions for connecting the four coils for each of the three phases to a power source are pulled out from any of six slots that are consecutive in the circumferential direction of the stator core out of the twelve slots around the entire circumference.

3. 2. The stator according to claim 1, each of the windings for each phase includes a first portion and a second portion formed by separate conductors; Two end faces of the stator core in an axial direction are defined as a first end face and a second end face, When the 12 magnetic pole teeth are arranged in order from the first tooth to the twelfth tooth in a first circumferential direction which is one of the circumferential directions of the stator core, In the first portion of one of the three phases, the conductor The first end surface is drawn into a first slot adjacent to the first tooth, Next, the wire is wound around the first tooth in a first direction, Then, the wire is led out to the second end surface side of the first slot and is routed as a crossover wire to the second end surface side to a position of the second slot adjacent to a fourth tooth, Next, a first lead-out portion is formed on the first end face side, the first lead-out portion being drawn into the second slot from the second end face side, and being led out from the first end face side without being wound around the magnetic pole tooth, and being drawn out by a predetermined length, and further being drawn into the second slot again from the first end face side, Next, the wire is wound around the fourth tooth in a second direction opposite to the first direction, The third slot is adjacent to the fourth tooth and extends toward a first end surface of the third slot opposite the second slot. In the second portion of the one phase, the conductor is The first end face is drawn into a fourth slot adjacent to the seventh tooth, Next, the seventh tooth is wound in the first direction, a second lead-out portion is formed on the first end surface side of a fifth slot adjacent to the seventh tooth and located opposite the fourth slot, the second lead-out portion is led out from the first end surface side of the fifth slot by a predetermined length, and is further led back into the fifth slot from the first end surface side; Then, the wire is led out to the second end surface side of the fifth slot and is routed as a crossover wire to the second end surface side to the position of the sixth slot adjacent to the tenth tooth, Next, the second end surface is drawn into the sixth slot, Next, the coil is wound in the second direction around the tenth tooth, Then, the sixth slot is pulled out to the first end face side. A stator comprising:

4. 4. The stator according to claim 3, the first slot is between the first tooth and the second tooth; the second slot is between the fourth tooth and the third tooth; the third slot is between the fourth and fifth teeth; the fourth slot is between the seventh and eighth teeth; the fifth slot is between the seventh and sixth teeth; A stator, wherein the sixth slot is between the tenth and eleventh teeth.

5. 4. The stator according to claim 3, the first slot is between the first tooth and the twelfth tooth; the second slot is between the fourth and fifth teeth; the third slot is between the fourth tooth and the third tooth; the fourth slot is between the seventh tooth and the sixth tooth; the fifth slot is between the seventh and eighth teeth; A stator, wherein the sixth slot is between the tenth and ninth teeth.

6. 4. The stator according to claim 3, a stator having three windings, each of which is positioned at a different position in the circumferential direction by one of the magnetic pole teeth;

7. 6. A stator according to any one of claims 3 to 5, The terminal wires of the first portion and the second portion of each phase are all connected to a common neutral point; A stator comprising: a first lead portion and a second lead portion which are joined together for each phase to form a lead portion for connecting to a power source for that phase.

8. 2. The stator according to claim 1, A stator characterized in that all of the lead portions for connecting the three-phase windings to a power source are pulled out from any of three circumferentially consecutive slots out of the twelve slots around the circumference of the stator core.

9. 2. The stator according to claim 1, Two end faces of the stator core in an axial direction are defined as a first end face and a second end face, When the 12 magnetic pole teeth are arranged in order from the first tooth to the twelfth tooth in a first circumferential direction which is one of the circumferential directions of the stator core, In the winding of one of the three phases, the conductor is The first end surface is drawn into a first slot adjacent to the first tooth, Next, the wire is wound around the first tooth in a first direction, Then, the wire is led out to the second end surface side of the first slot and is routed as a crossover wire to the second end surface side to a position of the second slot adjacent to a fourth tooth, Next, the second end surface is drawn into the second slot, Next, the wire is wound around the fourth tooth in the first direction, Then, the wire is led out to a second end surface side of a third slot adjacent to the fourth tooth and opposite to the second slot, and is routed as a crossover wire to the second end surface side up to a position of the fourth slot adjacent to a seventh tooth, Next, the lead-out portion is formed on the first end face side, the lead-out portion is drawn into the fourth slot from the second end face side, is led out from the first end face side without being wound around the magnetic pole tooth, is drawn out by a predetermined length, and is further drawn into the fourth slot again from the first end face side, Next, the wire is wound around the seventh tooth in a second direction opposite to the first direction, Then, the wire is led out to the second end surface side of the fourth slot and is routed as a crossover wire to the second end surface side to the position of the fifth slot adjacent to the tenth tooth, Next, the second end surface is drawn into the fifth slot, Next, the coil is wound in the second direction around the tenth tooth, Subsequently, the fifth slot is pulled out toward the first end surface side. A stator comprising:

10. 10. The stator according to claim 9, the first slot is between the first tooth and the second tooth; the second slot is between the fourth tooth and the third tooth; the third slot is between the fourth and fifth teeth; the fourth slot is between the seventh tooth and the sixth tooth; A stator, wherein the fifth slot is between the tenth and eleventh teeth.

11. 10. The stator according to claim 9, the first slot is between the first tooth and the twelfth tooth; the second slot is between the fourth and fifth teeth; the third slot is between the fourth tooth and the third tooth; the fourth slot is between the seventh and eighth teeth; A stator, wherein the fifth slot is between the tenth and ninth teeth.

12. 10. The stator according to claim 9, a stator having three windings, each of which is positioned at a different position in the circumferential direction by one of the magnetic pole teeth;

13. 13. A stator according to any one of claims 9 to 12, The ends of the windings of each phase are all connected to a common neutral point; A stator, wherein the lead-out portion forms a lead portion for connecting to a power source for each phase.

14. 2. The stator according to claim 1, The winding of each phase includes two coils wound in series around two adjacent magnetic pole teeth, and the winding direction of each of the coils wound in series differs for each magnetic pole tooth, A stator characterized in that all of the lead portions for connecting the two coils for each of the three phases to a power source are pulled out from any of five slots that are consecutive in the circumferential direction of the stator core out of the twelve slots around the entire circumference.

15. 2. The stator according to claim 1, Two end faces of the stator core in an axial direction are defined as a first end face and a second end face, When the 12 magnetic pole teeth are arranged in order from the first tooth to the twelfth tooth in a first circumferential direction which is one of the circumferential directions of the stator core, In the winding of one of the three phases, the conductor is The first end surface is drawn into a first slot adjacent to the first tooth, Next, the wire is wound around the first tooth in a first direction, Next, the wire is wound around a second tooth in a second direction opposite to the first direction, The winding around the second tooth is completed in a second slot adjacent to the second tooth, the wire is led out to the second end face side of the second slot, and is pulled around as a crossover wire to the second end face side to a position of a third slot adjacent to a seventh tooth, Next, the lead-out portion is formed on the first end face side, the lead-out portion is drawn into the third slot from the second end face side, is led out from the first end face side without being wound around the magnetic pole tooth, is drawn out by a predetermined length, and is further drawn into the third slot again from the first end face side, Next, the seventh tooth is wound in the first direction, Next, the wire is wound in the second direction around the eighth tooth. The wire is wound around the eighth tooth in a fourth slot adjacent to the eighth tooth, and is then pulled out to the first end surface side of the fourth slot. A stator comprising:

16. 16. A stator according to claim 15, the first slot is between the first tooth and the twelfth tooth; the second slot is between the second tooth and the third tooth; the third slot is between the seventh tooth and the sixth tooth; The fourth slot is located between the eighth tooth and the seventh tooth.

17. 16. A stator according to claim 15, the first slot is between the first tooth and the second tooth; the second slot is between the second tooth and the first tooth; the third slot is between the seventh tooth and the eighth tooth; A stator, wherein the fourth slot is between the eighth and ninth teeth.

18. 16. A stator according to claim 15, a stator according to claim 1, wherein the windings of each of the three phases are positioned at different positions in the circumferential direction by an amount corresponding to two of the magnetic pole teeth.

19. 19. A stator according to any one of claims 15 to 18, The ends of the windings of each phase are all connected to a common neutral point; A stator, wherein the lead-out portion forms a lead portion for connecting to a power source for each phase.

20. A rotating electric machine comprising the stator according to any one of claims 1 to 6, 8 to 12, and 14 to 18.

21. A stator winding method for winding a three-phase winding using a conductor around 12 magnetic pole teeth provided at equal angular intervals on an inner periphery of a stator core constituting a three-phase, 12-pole stator, comprising: each of the windings for each phase includes a first portion and a second portion formed by separate conductors; Two end faces of the stator core in an axial direction are defined as a first end face and a second end face, When the 12 magnetic pole teeth are arranged in order from the first tooth to the twelfth tooth in a first circumferential direction which is one of the circumferential directions of the stator core, The first portion of one of the three phases is formed by discharging a conductor from a first nozzle while moving at least one of the first nozzle and the stator core, inserting the first nozzle into a first slot adjacent to the first tooth from the first end face side; Then, winding the conductor around the first tooth in a first direction; Then, the first nozzle is led out from the first slot to the second end surface side, and rotated relative to the stator core to a position of the second slot adjacent to a fourth tooth, thereby forming a crossover wire on the second end surface side. Thereafter, the first nozzle is inserted into the second slot from the second end face side, and the conductor is led out from the first end face side without sandwiching the winding around the magnetic pole tooth, and a predetermined length of the conductor is drawn out. Furthermore, the first nozzle is re-inserted into the second slot from the first end face side, thereby forming a first drawn-out portion of the conductor on the first end face side. Then, the conductor is wound around the fourth tooth in a second direction opposite to the first direction; Then, the first nozzle is pulled out to a first end surface side of a third slot adjacent to the fourth tooth and opposite to the second slot. By forming The second portion of the certain phase is formed by discharging a conductor from a second nozzle while moving at least one of the second nozzle and the stator core, The second nozzle is inserted into a fourth slot adjacent to a seventh tooth from the first end face side; Then, winding the conductor around the seventh tooth in a first direction; Then, the second nozzle is led out from the first end face side of a fifth slot adjacent to the seventh tooth and opposite to the fourth slot to lead out the conductor by a predetermined length, and the second nozzle is further reinserted into the fifth slot from the first end face side to form a second lead-out portion of the conductor on the first end face side; Then, the second nozzle is led out from the fifth slot to the second end surface side, and rotated relative to the stator core to a position of a sixth slot adjacent to a tenth tooth, thereby forming a crossover wire on the second end surface side. Then, the second nozzle is inserted into the sixth slot from the second end surface side, Then, winding the conductor around the tenth tooth in the second direction; Thereafter, the second nozzle is pulled out to the first end surface side of the sixth slot. The present invention relates to a stator winding method and a method for winding a stator.

22. 22. A method for winding a stator as claimed in claim 21, comprising the steps of: the first slot is between the first tooth and the second tooth; the second slot is between the fourth tooth and the third tooth; the third slot is between the fourth and fifth teeth; the fourth slot is between the seventh and eighth teeth; the fifth slot is between the seventh and sixth teeth; A winding method for a stator, wherein the sixth slot is between the tenth tooth and the eleventh tooth.

23. 22. A method for winding a stator as claimed in claim 21, comprising the steps of: the first slot is between the first tooth and the twelfth tooth; the second slot is between the fourth and fifth teeth; the third slot is between the fourth tooth and the third tooth; the fourth slot is between the seventh tooth and the sixth tooth; the fifth slot is between the seventh and eighth teeth; The sixth slot is located between the tenth and ninth teeth.

24. 22. A method for winding a stator as claimed in claim 21, comprising the steps of: a winding method for a stator, the windings for each of the three phases being positioned at different positions in the circumferential direction by one of the magnetic pole teeth.

25. After the three-phase windings are wound around the stator core by the stator winding method according to any one of claims 21 to 24, all of the terminal wires of the first and second parts of each phase are connected to a common neutral point; For each phase, the first lead-out portion and the second lead-out portion are connected to a power source for that phase, A method for manufacturing a stator, comprising forming a star connection in which four coils per phase are connected in parallel, the coils being wound around one magnetic pole tooth.

26. A stator winding method for winding a three-phase winding using a conductor around 12 magnetic pole teeth provided at equal angular intervals on an inner periphery of a stator core constituting a three-phase, 12-pole stator, comprising: Two end faces of the stator core in an axial direction are defined as a first end face and a second end face, When the 12 magnetic pole teeth are arranged in order from the first tooth to the twelfth tooth in a first circumferential direction which is one of the circumferential directions of the stator core, The winding of one of the three phases is rotated by discharging a conductor from a nozzle while moving at least one of the nozzle and the stator core, inserting the nozzle into a first slot adjacent to the first tooth from the first end face side; Then, winding the conductor around the first tooth in a first direction; Then, the nozzle is led out from the first slot to the second end surface side, and rotated relative to the stator core to a position of the second slot adjacent to a fourth tooth, thereby forming a crossover wire on the second end surface side. Then, inserting the nozzle into the second slot from the second end face side; Then, winding the conductor around the fourth tooth in the first direction; Then, the nozzle is led out to a second end surface side of a third slot adjacent to the fourth tooth and opposite to the second slot, and rotated relative to the stator core to a position of the fourth slot adjacent to a seventh tooth, thereby forming a crossover wire on the second end surface side; Then, the nozzle is inserted into the fourth slot from the second end face side, and the conductor is led out from the first end face side without being wound around the magnetic pole teeth, and a predetermined length of the conductor is drawn out. Furthermore, the nozzle is re-inserted into the fourth slot from the first end face side, thereby forming a lead-out portion of the conductor on the first end face side. Thereafter, the conductor is wound around the seventh tooth in a second direction opposite to the first direction; Then, the nozzle is led out from the fourth slot to the second end surface side, and rotated relative to the stator core to a position of a fifth slot adjacent to a tenth tooth, thereby forming a crossover wire on the second end surface side. Then, inserting the nozzle into the fifth slot from the second end face side; Then, winding the conductor around the tenth tooth in the second direction; Thereafter, the nozzle is pulled out toward the first end surface side of the fifth slot. The present invention relates to a stator winding method and a method for winding a stator.

27. 27. A method for winding a stator as claimed in claim 26, comprising the steps of: the first slot is between the first tooth and the second tooth; the second slot is between the fourth tooth and the third tooth; the third slot is between the fourth and fifth teeth; the fourth slot is between the seventh tooth and the sixth tooth; A method for winding a stator, wherein the fifth slot is between the tenth tooth and the eleventh tooth.

28. 27. A method for winding a stator as claimed in claim 26, comprising the steps of: the first slot is between the first tooth and the twelfth tooth; the second slot is between the fourth and fifth teeth; the third slot is between the fourth tooth and the third tooth; the fourth slot is between the seventh and eighth teeth; A method for winding a stator, wherein the fifth slot is between the tenth tooth and the ninth tooth.

29. 27. A method for winding a stator as claimed in claim 26, comprising the steps of: a winding method for a stator, the windings for each of the three phases being positioned at different positions in the circumferential direction by one of the magnetic pole teeth.

30. After the three-phase winding is wound around the stator core by the stator winding method according to any one of claims 26 to 29, All ends of the windings of each phase are connected to a common neutral point; By connecting the lead-out portion to the power source of each phase, A method for manufacturing a stator, comprising forming a star connection in which two coils for each phase are connected in parallel, the coils being wound in series around the two magnetic pole teeth.

31. A stator winding method for winding a three-phase winding using a conductor around 12 magnetic pole teeth provided at equal angular intervals on an inner periphery of a stator core constituting a three-phase, 12-pole stator, comprising: Two end faces of the stator core in an axial direction are defined as a first end face and a second end face, When the 12 magnetic pole teeth are arranged in order from the first tooth to the twelfth tooth in a first circumferential direction which is one of the circumferential directions of the stator core, The winding of one of the three phases is rotated by discharging a conductor from a nozzle while moving at least one of the nozzle and the stator core, inserting the nozzle into a first slot adjacent to the first tooth from the first end face side; Then, winding the conductor around the first tooth in a first direction; Subsequently, the conductor is wound around a second tooth in a second direction opposite to the first direction; Then, winding around the second tooth is completed in a second slot adjacent to the second tooth, the nozzle is led out to the second end face side of the second slot, and the nozzle is rotated relative to the stator core to a position of a third slot adjacent to a seventh tooth, thereby forming a crossover wire on the second end face side; Thereafter, the nozzle is inserted into the third slot from the second end face side, and the conductor is led out from the first end face side without being wound around the magnetic pole teeth, and a predetermined length of the conductor is drawn out. Furthermore, the nozzle is re-inserted into the third slot from the first end face side, thereby forming a lead-out portion of the conductor on the first end face side. Then, winding the conductor around the seventh tooth in the first direction; Subsequently, the conductor is wound around an eighth tooth in the second direction; Thereafter, winding around the eighth tooth is completed in a fourth slot adjacent to the eighth tooth, and the nozzle is pulled out from the first end surface side of the fourth slot. The present invention relates to a stator winding method and a method for winding a stator.

32. 32. A method for winding a stator as claimed in claim 31, comprising the steps of: the first slot is between the first tooth and the twelfth tooth; the second slot is between the second tooth and the third tooth; the third slot is between the seventh tooth and the sixth tooth; The fourth slot is located between the eighth tooth and the seventh tooth.

33. 32. A method for winding a stator as claimed in claim 31, comprising the steps of: the first slot is between the first tooth and the second tooth; the second slot is between the second tooth and the first tooth; the third slot is between the seventh tooth and the eighth tooth; The fourth slot is located between the eighth and ninth teeth.

34. 32. A method for winding a stator as claimed in claim 31, comprising the steps of: a winding method for a stator, wherein the windings of each of the three phases are positioned at different positions in the circumferential direction by an amount corresponding to two of the magnetic pole teeth.

35. After the three-phase winding is wound around the stator core by the stator winding method according to any one of claims 31 to 34, All ends of the windings of each phase are connected to a common neutral point; By connecting the lead-out portion to the power source of each phase, A method for manufacturing a stator, comprising the steps of connecting two coils for each phase in parallel, the coils being wound in series around the two magnetic pole teeth, and forming a star connection in which the winding direction of the coils differs for each magnetic pole tooth.

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