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

Abstract

This improves the manufacturing efficiency of the windings of a three-phase, 12-pole stator, in which three-phase coils are wound using conductors around 12 magnetic pole teeth provided at equal angular intervals on the inner circumference of the stator core. [Solution] When a three-phase coil C is wound with a conductor 43 around 12 magnetic pole teeth T1 to T12 arranged at equal angular intervals on the inner circumference of a stator core 10 that constitutes a three-phase, 12-pole stator, the windings of each of the three phases are configured so that the way the conductor 43 is wound around the magnetic pole teeth is common to all of them but the circumferential positions of the stator core 10 differ, and the windings of each of the three phases each have a first part and a second part in which the way the conductor 43 is wound around the magnetic pole teeth is common to all of them but the circumferential positions of the stator core 10 differ by half a circumference, and six nozzles 41U to 42W that eject the conductor 43 are moved relative to the stator core 10 in a synchronized manner so that the windings of the first part and the second part of each of the three phases are all wound simultaneously.

Description

[Technical field]

[0001] The present invention relates to a winding method for a stator used in an electric motor such as a motor, in which a three-phase, 12-pole stator is wound with three-phase coils using conductors around 12 magnetic pole teeth provided at equal angular intervals on the inner circumference of a stator core, and also to a manufacturing method for a three-phase, 12-pole stator, a three-phase, 12-pole stator, and a rotating electric machine equipped with 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, the winding methods and winding structures described in Patent Documents 1 to 4 could not efficiently wind 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, which resulted in insufficient manufacturing efficiency for three-phase, 12-pole stators and rotating electrical machines such as motors equipped with the stators.

[0007] The present invention has been made in view of the above circumstances, and aims 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 provided at equal angular intervals on the inner circumference of a stator core, as well as the manufacturing efficiency of a three-phase, 12-pole stator and a rotating electric machine such as a motor equipped with the stator. [Means for solving the problem]

[0008] The stator winding method of the present invention, which is for achieving the above object, winds three-phase windings using conductors around 12 magnetic pole teeth provided at equal angular intervals on the inner periphery of a stator core constituting a three-phase, 12-pole stator. The windings of each of the three phases have a common way of winding the conductor around the magnetic pole teeth, but are positioned differently in the circumferential direction of the stator core, and each of the windings of each phase has a first portion and a second portion in which the conductor is wound around the magnetic pole teeth in a common way, but are positioned differently in the circumferential direction by half a circumference. Six nozzles that eject conductors are moved synchronously relative to the stator core, thereby winding all of the windings of the first portion and the second portion in each of the three phases simultaneously.

[0009] In such a stator winding method, when slots are formed between adjacent magnetic pole teeth, the two axial end faces of the stator core are defined as a first end face and a second end face, respectively, and the 12 magnetic pole teeth are defined as a first tooth to a twelfth tooth in order in a first circumferential direction which is one of the circumferential directions, the first portion of one of the three phases may be formed as shown in (a) to (f) below by ejecting a conductor from a nozzle while moving at least one of the nozzle and the stator core. (a) The nozzle is inserted from the first end face side into a first slot adjacent to the first tooth. (b) Then, winding the conductor in a first direction around the first tooth. (c) Then, the nozzle is led out from the first slot to the second end face side and rotated relative to the stator core to the position of the second slot adjacent to a fourth tooth, thereby forming a crossover wire on the second end face side. (d) Then, the nozzle is inserted into the second slot from the second end face side, and the conductor is drawn out from the first end face side without being wound around the magnetic pole tooth to a predetermined length, and the nozzle is further inserted again into the second slot from the first end face side to form an drawn-out portion of the conductor on the first end face side. (e) Thereafter, the conductor is wound around the fourth tooth in a second direction that is opposite to the first direction. (f) Thereafter, the nozzle is pulled out to the first end face side of a third slot opposite the second slot and adjacent to the fourth tooth.

[0010] Furthermore, the first slot may be between the first tooth and the second tooth, and the second slot may be between the fourth tooth and the third tooth. Alternatively, the first slot may be between the first tooth and the twelfth tooth, and the second slot may be between the fourth tooth and the fifth tooth. In the above-mentioned stator winding method, it is preferable that the windings of each of the three phases are positioned differently in the circumferential direction by one magnetic pole tooth.

[0011] Furthermore, the method for manufacturing a stator of the present invention involves winding the three-phase windings around the stator core by any of the stator winding methods including (a) to (f) above, then connecting all of the end wires of the first and second parts of each phase to a common neutral point, and connecting each of the lead-out portions of the first and second parts for each phase to a power supply for that phase, thereby forming a star connection that connects four coils for each phase in parallel, each coil being wound around one magnetic pole tooth.

[0012] In the above-mentioned stator winding method, the first portion of one of the three phases may be formed as shown in the following (g) to (l) instead of the above (a) to (f). (g) Inserting the nozzle from the first end face side into a first slot adjacent to the first tooth. (h) Then, winding the conductor in a first direction around the first tooth. (i) Then, the nozzle is led out from the first slot to the second end face side and rotated relative to the stator core to the position of the second slot adjacent to a fourth tooth, thereby forming a crossover wire on the second end face side. (j) Then, the nozzle is inserted into the second slot from the second end face side. (k) Then, winding the conductor around the fourth tooth in the first direction. (l) Then, the nozzle is pulled out to the first end face side of the second slot. In this case, it is preferable that the windings of each of the three phases are positioned at different positions in the circumferential direction by one magnetic pole tooth.

[0013] Furthermore, the first slot may be between the first tooth and the second tooth, and the second slot may be between the fourth tooth and the third tooth. Alternatively, the first slot may be between the first tooth and the twelfth tooth, and the second slot may be between the fourth tooth and the fifth tooth.

[0014] Furthermore, another method of manufacturing a stator according to the present invention involves winding the three-phase windings around the stator core by any of the stator winding methods including (g) to (l) above, and then connecting all of the winding end wires of the first and second parts of each phase to a common neutral point, and connecting each of the winding start end wires of the first and second parts for each phase to a power supply for that phase, thereby forming a star connection that connects in parallel two coils for each phase, the coils being wound in series around two of the magnetic pole teeth.

[0015] In the above-mentioned stator winding method, the first portion of one of the three phases may be formed as shown in the following (m) to (p) instead of the above (a) to (f). (m) Inserting the nozzle from the first end face side into a first slot adjacent to a second tooth. (n) Then, winding the conductor in a first direction around the second tooth. (o) Subsequently, the conductor is wound around the first tooth in a second direction opposite to the first direction. (p) Thereafter, winding around the first tooth is completed in a second slot adjacent to the first slot, and the nozzle is pulled out to the first end face side of the second slot.

[0016] Furthermore, the first slot may be between the second tooth and the third tooth, and the second slot may be between the first tooth and the second tooth. Alternatively, the first slot may be between the second tooth and the first tooth, and the second slot may be between the first tooth and the twelfth tooth.

[0017] Furthermore, still another method of manufacturing a stator according to the present invention involves winding the three-phase winding around the stator core by any of the stator winding methods including (m) to (p) above, and then connecting the winding end wire of the first portion and the winding start wire of the second portion of each phase to a common neutral point, and connecting the winding start end wire of the first portion and the winding end wire of the second portion for each phase to a power supply for that phase, thereby connecting two coils for each phase in parallel that are wound in series around two adjacent ones of the magnetic pole teeth, and forming a star connection in which the winding direction of the series wound coils differs for each magnetic pole tooth.

[0018] The present invention is not limited to the stator winding method and stator manufacturing method described above, but can be embodied in any form, such as a stator as an object, a winding machine that performs the winding method, a system including a plurality of devices, a program for controlling the winding machine, a recording medium storing such a program, an armature wound by the winding machine, and a rotating electric machine including such an armature. Effect of the Invention

[0019] 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 provided at equal angular intervals on the inner circumference of a stator core, and also 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]

[0020] [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 the winding according to the first embodiment of the present invention, in which 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. [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. [Diagram 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

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] [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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Next, the structure of the windings in the stator 1 will be described with reference to FIGS. 3A and 3B. Fig. 3A shows the winding structure for only the U-phase, and Fig. 3B shows the winding structure for three phases. These figures show the 12 magnetic pole 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 3A and 3B include the following features 1 and 2. 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) The windings of each phase have a common way of winding the conductor around the magnetic pole teeth T, and each winding has a first portion and a second portion that are positioned at different positions in the circumferential direction of the stator core 10 by half a circumference.

[0035] Specifically, the U-phase winding includes a first portion 110U and a second portion 120U. 3A, the first portion 110U starts from an end wire 111U at the winding start 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 (in the 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.

[0036] 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 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. The first portion 110U is then wound clockwise (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 S4 (third slot) opposite the slot S3, adjacent to the magnetic pole tooth T4, to reach the end line 113U of the winding termination.

[0037] The second portion 120U is located at a position rotated half a turn clockwise from the first portion 110U when viewed from the perspective of FIG. 1, that is, six magnetic pole teeth T, and has the same shape as the first portion 110U. That is, the second portion 120U starts from the end wire 121U, is pulled into the slot S7 (first slot) from the first end face side, and is then wound counterclockwise around the magnetic pole tooth T7 to form the coil C7. The second portion 120U is then 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 (second slot).

[0038] The second portion 120U is then pulled into the slot S9 from the second end face side, pulled out to the first end face side, and then returned to the slot S9 to form a pulled-out portion 122U. The second portion 120U is further wound clockwise around the magnetic pole tooth T10 to form a coil C10, which is drawn out to the first end face side of the slot S10 (third slot) to reach an end wire 123U.

[0039] 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.

[0040] 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).

[0041] 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.

[0042] 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.

[0043] In this case, the coil C1, which is located in front of the pull-out portion 112U in terms of the winding order, has a winding direction by the actual nozzle that is opposite to the connection direction as seen from the pull-out portion 112U. The coil C4, which is located behind the pull-out portion 112U, has a winding direction that is the same as the connection direction as seen from the pull-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.

[0044] 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.

[0045] A similar relationship exists between the lead-out portion 122U, the end wires 121U and 123U, the coils C7 and C10, and the crossover wire L2U. Therefore, by connecting lead portions 112U, 122U together to U-phase power supply 50U and connecting terminal wires 111U, 113U, 121U, 123U together to neutral point 60, 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.

[0046] To connect 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 connecting to the power source 50. The lead portion may be configured by connecting the two lead-out portions 112, 122 to a common connector. Regarding 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.

[0047] 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 are pulled out only from three consecutive slots S on the right and left sides of the figure (slots S3 to S5 and slots S9 to S11). Therefore, when collecting the three-phase lead wires for each phase, it is only necessary to reach out to positions generally in the left-right direction of the figure to grasp the pull-out wires, and compared to a case in which the lead wires are distributed evenly all around, this can achieve high work efficiency, especially when wiring is done manually. This effect is obtained by the above-mentioned (Feature 1).

[0048] 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, the lead portions 112, 122 that will become the respective lead wires are formed, and then the coil C is wound from above. Therefore, the conductors on both sides of each lead portion 112, 122 are pressed by the coil C, and the lead portions 112, 122 are fixed to the stator core 10 within the slots S. Therefore, during wiring work, the wire does not move relative to the stator core 10 near the exit of the slots S, and the wiring can be easily handled. In this respect as well, the stator 1 having the winding structure described above allows wiring to be performed with high work efficiency. The above-mentioned improvement in work efficiency leads to an improvement in the manufacturing efficiency of rotating electrical machines such as motors.

[0049] 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.

[0050] The winding of the first embodiment described above has the above-mentioned (Feature 1) and (Feature 2), and therefore when viewed as a whole for the three phases, the winding method of the conductor around the magnetic pole teeth T is common, and the winding has six parts at different circumferential positions on the stator core 10. Therefore, by synchronously moving the six nozzles that eject the conductor relative to the stator core 10, the three-phase windings, i.e., the windings of the first portion 110 and the second portion 120 for each of the three phases, can all be wound simultaneously.

[0051] For this purpose, for example, as shown in Fig. 6A, a winding machine may be used in which six nozzles 41U, 41V, 41W, 42U, 42V, and 42W are fixed to a common nozzle fixing part 40, and a wire conductor 43 can be discharged from each of the nozzles 41 and 42. Each of the nozzles 41 and 42 includes an advancing / retracting mechanism 41Ua, 41Va, 41Wa, 42Ua, 42Va, and 42Wa in the nozzle fixing part 40, and can synchronously advance and retreat in the radial direction of the stator core 10. In addition, by rotating or translating at least one of the nozzle fixing part 40 and the stator core 10 to be wound, each of the nozzles 41 and 42 can synchronously move 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).

[0052] In the following explanation, the nozzles 41, 42 are described as being moved, but the winding can be substantially the same as that described below by moving only the stator core 10, or by moving both the nozzles 41, 42 and the stator core 10. In the following description, when terms such as "circumferential direction," "axial direction," and "radial direction" are used, they will be understood to refer to stator core 10 which is the subject of winding, unless otherwise specified.

[0053] The nozzles 41U, 41V, and 41W are nozzles for winding the first portions 110U, 110V, and 110W of the U-phase, V-phase, and W-phase, 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. Nozzles 42U, 42V, and 42W are also nozzles for winding second portions 120U, 120V, and 120W, and are positioned in the circumferential direction different from nozzles 41U, 41V, and 41W by half a turn, which corresponds to the difference in the position of the winding between first portion 110 and second portion 120 of each phase. Conductors 43 are ejected from these six nozzles 41, 42, while the nozzles 41, 42 are moved relative to the stator core 10 so as to circle around the magnetic pole teeth T, as shown in FIG. 6B, thereby allowing the coils C to be wound around the magnetic pole teeth T.

[0054] 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, an arbitrary number of turns of the coil C1 can be wound around the magnetic pole tooth T1. The same can be done when winding is performed on other magnetic pole teeth T using other nozzles 41 and 42.

[0055] 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 for connecting to another magnetic tooth T after winding around one magnetic tooth T, the nozzle 41 is moved 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, while the nozzle 41 is on the crossover wire forming side (second end face side). In this state, the nozzle 41 is rotated in the circumferential direction to form the crossover wire L by winding the conductor 43 around the pin 16. When the nozzle 41 reaches the position of the magnetic tooth T where the next winding is to be performed, it is sufficient to move the nozzle 41 to a position suitable for winding as shown in FIG. 6B. Of course, the crossover wire L can also be formed by the nozzle 42 in the same manner. In addition, the insulation between different crossover wires L may be strengthened by, for example, changing the axial position of each crossover wire L.

[0056] 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, after the nozzle 41U is drawn out toward the first end face side of the slot S3, it is further drawn out in the axial direction a predetermined distance (a length sufficient for use as the lead wire described above), and the conductor 43 is moved while being drawn out. 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 of the conductor 43 can be formed.

[0057] 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.

[0058] The lead-out portions can be formed in the same manner at other locations. When winding is performed simultaneously using six nozzles 41, 42, the lead-out portions are also formed at six locations simultaneously. However, the operation timing of the nozzles 41, 42 and locations other than the stator core 10, for example, the conductor holding portion 44, does not need to be the same at all six 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.

[0059] As described above, the winding shown in Figures 3A and 3B can be formed by using a winding machine equipped with six nozzles 41, 42 that can be driven synchronously, discharging the conductor 43, which is a wire rod, from the tips of the nozzles 41, 42, 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 nozzles 41, 42 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. With this winding method, the winding can be completed in approximately 1 / 6 the time required when winding each conductor one by one, and in approximately 1 / 2 the time required when simply winding three phases simultaneously, thereby significantly improving the manufacturing efficiency of stator 1.

[0060] For comparison, Fig. 7 shows another example of the arrangement of nozzles 41, 42 in a winding machine. The example in Fig. 7 differs from the example in Fig. 6A only in the circumferential positional relationship of the nozzles 41, 42, and the same reference numerals are used to designate parts corresponding to those in Fig. 6A. 7, the nozzles 41U, 41V, and 41W are positioned circumferentially different from one another by two magnetic pole teeth T. The same is true for the nozzles 42U, 42V, and 42W. 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.

[0061] As can be seen by comparing Fig. 7 with Fig. 6A, the configuration in Fig. 7 has more space for arranging the advancing and retracting mechanisms 41a, 42a than the configuration in Fig. 6A, because the advancing and retracting mechanisms 41a, 42a of adjacent nozzles 41, 42 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.

[0062] 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. 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 drawn out in an even distribution around the entire circumference of stator core 10. In that case, it will be necessary to reach around the entire circumference of stator core 10 to connect the wires to power source 50, which reduces work efficiency compared to the arrangement described using FIG. 5.

[0063] [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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] The second portion 120U is located at a position rotated counterclockwise half a turn from the first portion 110U when viewed from the perspective of Fig. 1, that is, six magnetic pole teeth T, and the shape of the winding is the same as that of the first portion 110U. Although the rotation direction is opposite to that in Fig. 3A and Fig. 3B, the difference in position is half a turn, so the positional relationship between the first portion 110U and the second portion 120U is the same as in Fig. 3A and Fig. 3B.

[0069] Such a winding also has the (Feature 1) and (Feature 2) described in the first embodiment, and like the winding of the first embodiment, six parts can be wound simultaneously in three phases. 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 those in 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.

[0070] [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.

[0071] 10A and 10B are diagrams respectively showing the winding structure of 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.

[0072] 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. The second portion 120U has the same shape as the first portion 110U and is located at a position rotated halfway around the first portion 110U, similar to the first embodiment.

[0073] Such a winding also has the (Feature 1) and (Feature 2) described in the first embodiment, and like the winding of the first embodiment, six parts can be wound simultaneously in three phases. 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.

[0074] 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 the lead wires are drawn out only from two locations each consisting of three consecutive slots S (slots S4 to S6 and slots S10 to S12), as in the case of FIG. 5. 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.

[0075] 10A and 10B, in the winding of the second modified example, each jumper wire L has a length that spans approximately four magnetic pole teeth T. On the other hand, in the winding shown in FIGS. 3A and 3B, each jumper wire L has a length that spans approximately two magnetic pole teeth T. In general, from the standpoint of ease of insulation and noise prevention, it is preferable for the jumper wire L to be short. In this respect, it can be said that the winding of the above-described first embodiment is more preferable than the winding of the second modified example.

[0076] [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.

[0077] 12A and 12B are diagrams respectively showing the winding structure of 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 opposite direction.

[0078] 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. The second portion 120U has the same shape as the first portion 110U and is located at a position rotated halfway around the first portion 110U, similarly to the first modification of the first embodiment.

[0079] This type of winding also has the (Feature 1) and (Feature 2) described in the first embodiment, and like the winding of the first embodiment, six parts can be wound simultaneously in three phases. 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, the same as in 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 the same as in 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.

[0080] (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) but does not have (Feature 1).

[0081] 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 magnetic pole tooth T1 first, whereas 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 magnetic pole tooth T3 first. Similarly, in the W-phase first portion 110W, the end wire 111W is drawn into slot S5, which is two more magnetic pole teeth T away, and is wound around magnetic pole tooth T5 first. The structure of the first portion 110U is the same as that shown in FIG. 3A.

[0082] With this arrangement, as described with reference to FIG. 7, it is possible to secure a sufficient space for arranging the nozzles 41, 42 and their advancing and retracting mechanisms 41a, 42a for winding six portions simultaneously in three phases. However, as can be seen from FIG. 13, each of the lead wires 112, 122 is drawn out evenly from the entire circumference of the stator core 10, which reduces the efficiency of the wiring work.

[0083] 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.

[0084] [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.

[0085] 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) and (Feature 2) described in the first embodiment, and can simultaneously wind six portions in three phases as in the first embodiment. In the winding of the second embodiment, as shown in FIG. 14A, the first portion 110U of the U-phase winding 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.

[0086] 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. The first portion 110U is then pulled into the slot S3 from the second end face side, wound counterclockwise (in the first 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 to reach the end line 113U at the winding termination.

[0087] As in the first embodiment, the second portion 120U is located at a position rotated half a turn clockwise from the first portion 110U, i.e., six magnetic pole teeth T, as viewed from the perspective of Figure 1, and the shape of the winding is the same as that of the first portion 110U. Also, as shown in FIG. 14B, the V-phase and W-phase windings are located at positions rotated clockwise (to the right in FIG. 14B) from the above-described U-phase winding by one and two magnetic pole teeth T, respectively, and the shape of the windings is the same as that of the U-phase winding.

[0088] 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.

[0089] For the U-phase, by connecting the terminal wires 111U and 121U to the U-phase power supply 50U and the terminal wires 113U and 123U to the neutral point 60, the coils C1 and C4 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, counterclockwise when viewed from the center of the stator core 10). That is, the terminal wires 111U and 121U can be used as lead wires, and the terminal wires 113U and 123U can be used as neutral wires. The crossover wire L1U functions as a connection between the coils C1 and C4, and the crossover wire L2U functions as a connection between the coils C7 and C10.

[0090] For the V phase, a circuit in which coils C2 and C5 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 C3 and C6 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. To connect to the power source 50, two winding start side end wires 111, 121 for each phase may be bundled together and connected to the power source 50 of that phase. This bundled location corresponds to a lead portion for connecting to the power source 50. The lead portion may be configured by connecting the two end wires 111, 121 to a common connector. For the neutral point, a total of six wires, the winding end side end wires 113, 123 for the three phases, may be connected to a common neutral point 60.

[0091] As can be seen from FIG. 16, the lead wires are drawn out only from three consecutive slots S (slots S1 to S3 and slots S7 to S9) on the lower right and upper left sides of the figure. Therefore, as in the first embodiment, high work efficiency can be obtained for wiring the lead wires. Moreover, in the second embodiment, the neutral wire is also drawn out only from three consecutive slots S (slots S3 to S5 and slots S9 to S11) on the right and left sides of the figure. Therefore, similar high work efficiency can be obtained for the neutral wire as well. These effects are obtained by the above-mentioned (Feature 1).

[0092] 14A and 14B, the end wires 111, 121 which become the respective lead wires are formed, and then the coil C is wound from above. Therefore, like the lead portions 112, 122 of the first embodiment, the end wires 111, 121 are pressed by the coil C and fixed to the stator core 10, making it easy to route the wiring. Even if the end wires 113, 123 side are used as lead wires and the end wires 111, 121 are used as neutral wires, the two-parallel connection shown in FIG. 15 is possible, but by using the end wires 111, 121 as lead wires, the lead wire side, which requires more delicate routing, can be fixed, which has a significant effect of improving work efficiency.

[0093] [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.

[0094] 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, as shown in FIG. 17A, the U-phase first portion 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.

[0095] 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. The first portion 110U is then pulled into the slot S4 from the second end face side, wound clockwise around the magnetic pole tooth T4 to form the coil C4, and then pulled out to the first end face side of the slot S4 to reach the end line 113U at the winding termination. The second portion 120U has the same shape as the first portion 110U and is located at a position rotated halfway around the first portion 110U, similarly to the second embodiment.

[0096] This type of winding also has the (Feature 1) and (Feature 2) described above, and like the windings of the first and second embodiments, six parts can be wound simultaneously in three phases. 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 opposite to that of the second embodiment, that is, clockwise as viewed from the center of the stator core 10.

[0097] 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 Figure 18, as in the case of Figure 16, each lead wire and each neutral wire is drawn out only from three consecutive slots S in two locations (the lead wires are slots S12-S2 and slots S6-S8, and the neutral wires are slots S4-S6 and slots S10-S12). Therefore, with the stator 1 and the winding method thereof of this modified example, the same effects as those of the configuration of the second embodiment described above can be obtained.

[0098] 17A and 17B, in the winding of this modified example, each jumper wire L has a length that spans approximately four magnetic pole teeth T. On the other hand, in the winding shown in FIGS. 14A and 14B, each jumper wire L has a length that spans approximately two 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 second embodiment described above is more preferable than the winding of this modified example.

[0099] 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.

[0100] 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.

[0101] [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.

[0102] 19A and 19B are diagrams respectively showing the winding structure of the stator 1 of the third embodiment, similar to Figs. 3A and 3B. The winding structure of this third embodiment also has (Feature 1) and (Feature 2) described in the first embodiment, and six parts can be wound simultaneously for three phases, similar to the first embodiment. However, since the circumferential positions of the windings for each phase differ by two magnetic pole teeth T, the arrangement of the nozzles 41, 42 shown in Fig. 7 is used.

[0103] In the winding of the third embodiment, as shown in FIG. 19A, the U-phase first portion 110U starts from an end line 111U at the winding starting point, is pulled into a slot S2 (first slot) adjacent to the magnetic pole tooth T2 from the first end face side, and is then wound counterclockwise (first direction) around the magnetic pole tooth T2 to form a coil C2.

[0104] The first portion 110U is then wound clockwise (in the second direction) around the adjacent magnetic pole tooth T1 to form a coil C1, and the winding ends in the slot S1 (second slot) adjacent to the magnetic pole tooth T1, before being pulled out to the first end face side of the slot S1 and reaching an end line 113U at the end of the winding. There may be no 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. Overall, the winding of the third embodiment does not include a crossover wire.

[0105] As in the first and second embodiments, the second portion 120U is located at a position rotated half a turn clockwise from the first portion 110U, i.e., six magnetic pole teeth T, as viewed from the perspective of Figure 1, and the shape of the winding is the same as that of the first portion 110U. Also, as shown in FIG. 19B, the V-phase and W-phase windings are located at positions rotated clockwise (to the right in FIG. 19B) from the above-described U-phase winding by two and four magnetic pole teeth T, respectively, and their shapes are the same as the U-phase winding. In the winding of the third embodiment, the first portion 110 and the second portion 120 are wound around two adjacent magnetic pole teeth T, so that the winding of each phase needs to be shifted in the circumferential direction by two magnetic pole teeth T rather than one.

[0106] 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.

[0107] 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.

[0108] "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 terminal wires 111U and 123U to the U-phase power supply 50U and connecting the terminal wires 113U and 121U 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 terminal wires 111U and 123U can be used as lead wires, and the terminal wires 113U and 121U can be used as neutral wires. The reason why the end wire 111U on the starting end side of the first portion 110 and the end wire 123U on the terminal end side of the second portion 120 are used as lead wires is to reverse the current direction for each magnetic pole tooth T while using the same winding method.

[0109] 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. For connection to the power source 50, two terminal wires 111, 123 serving as lead wires for each phase may be bundled together and connected to the power source 50 of that phase. This bundled location corresponds to a lead portion for connection to the power source 50. The lead portion may be configured by connecting the two terminal wires 111, 123 to a common connector. For the neutral point, a total of six terminal wires 113, 121 for three phases serving as neutral wires may all be connected to a common neutral point 60.

[0110] 21, in the winding of the third embodiment, although there are some dense and sparse areas for both the lead wires and the neutral wire, they are drawn out from almost the entire circumference of the stator core 10. This is unavoidable due to the constraint of using coils C wound in series around two adjacent magnetic pole teeth, and this embodiment proposes a configuration that can simultaneously wind six parts for three phases even under this constraint, thereby achieving the effect of speeding up the winding process.

[0111] (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.

[0112] 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 first portion 110U starts from the end line 111U at the winding starting point, as shown in FIG. 22A, is pulled into slot S1 (first slot) adjacent to the magnetic pole tooth T2 from the first end face side, and is then wound clockwise (first direction) around the magnetic pole tooth T2 to form coil C2.

[0113] The first portion 110U is then wound counterclockwise (in the second direction) around the adjacent magnetic pole tooth T1 to form a coil C1, and the winding ends in slot S12 (second slot) adjacent to the magnetic pole tooth T1 and is pulled out to the first end face side of slot S12, reaching an end line 113U at the end of the winding. There does not have to be a clear boundary between coil C2 and coil C1, and there is no crossover wire, similar to the third embodiment. The second portion 120U has the same shape as the first portion 110U and is located at a position rotated halfway around the first portion 110U, which is also the same as in the third embodiment. This type of winding also has the (Feature 1) and (Feature 2) described above, and like the windings of the first to third embodiments, six parts can be wound simultaneously in three phases. 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.

[0114] 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 modified example, similarly to the case of Fig. 21, both the lead wires and the neutral wire are drawn out from almost the entire circumference of the stator core 10. That is, similarly to the third embodiment, this modified example also makes it possible to wind six parts simultaneously for three phases even under the constraint of using coils wound in series around two adjacent magnetic pole teeth, thereby achieving the effect of speeding up the winding process.

[0115] 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.

[0116] Also, as a modification corresponding to the modification described in the fourth modified example of the first embodiment, it is possible to modify the windings of each phase so that the circumferential position of the stator core 10 differs by four magnetic pole teeth T. In the third embodiment, since the lead wires and neutral wires are drawn out from almost the entire circumference of the stator core 10 as described above, even if the difference in circumferential position is four magnetic pole teeth T, the efficiency of the wiring work does not change significantly compared to when the difference is two. Also, even when the difference in circumferential position is four pole teeth T, six portions can be wound simultaneously using nozzles 41, 42 arranged as shown in Fig. 7. In this sense, in the case of the third embodiment, also from the viewpoint of the arrangement space for nozzles 41, 42 and their advancing and retracting mechanisms 41a, 42a, there is no significant difference between when the difference in circumferential position is two pole teeth T and when it is four pole teeth T.

[0117] 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.

[0118] 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.

[0119] 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]

[0120] 1... stator, 10... stator core, 11... annular portion, 13, 23... insulating material, 14, 24... outer wall, 15... crossover arrangement portion, 16... pin, 17, 27... magnetic pole tooth covering portion, 31... rotating shaft, 32... rotor, 40... nozzle fixing portion, 41, 42... nozzle, 41a, 42a... advancement and retreat mechanism, 43... conductor, 44... conductor holding portion, 50... power supply, 60... neutral point, 110... first portion, 111, 113... end wire of first portion, 112... lead-out portion of first portion, 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... crossover, 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 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: The windings of the three phases have a common conductor winding method around the magnetic pole teeth, but are positioned differently in the circumferential direction of the stator core, each of the windings for each phase includes a first portion and a second portion that have a common winding method for the conductor around the magnetic pole teeth and are positioned in the circumferential direction different from each other by half a circumference; A stator winding method, characterized in that six nozzles that eject conductors are moved synchronously relative to the stator core, thereby winding all of the first and second portions of the windings for each of the three phases simultaneously.

2. 2. A stator winding method according to claim 1, comprising the steps of: A slot is formed between adjacent said pole teeth, 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 twelve magnetic pole teeth are arranged in order from a first tooth to a twelfth tooth in a first circumferential direction, which is one of the circumferential directions, The first portion of one of the three phases is formed 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, the 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 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 second slot from the first end face side, thereby forming a lead-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; Thereafter, the nozzle is pulled out toward the first end surface of a third slot adjacent to the fourth tooth and opposite to the second slot. The present invention relates to a stator winding method and a method for winding a stator.

3. 3. A stator winding method according to claim 2, comprising the steps of: the first slot is between the first tooth and the second tooth; The second slot is located between the fourth tooth and the third tooth.

4. 3. A stator winding method according to claim 2, comprising the steps of: the first slot is between the first tooth and the twelfth tooth; The second slot is located between the fourth tooth and the fifth tooth.

5. 3. A stator winding method according to claim 2, comprising the steps of: a winding method for a stator, the windings for each of the three phases being positioned differently in the circumferential direction by one magnetic pole tooth each;

6. 6. After winding the three-phase windings around the stator core by the stator winding method according to claim 2, all of the terminal wires of the first and second parts of each phase are connected to a common neutral point; For each phase, each of the lead-out portions of the first portion and the second portion is connected to a power source of the corresponding 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.

7. 2. A stator winding method according to claim 1, comprising the steps of: A slot is formed between adjacent said pole teeth, 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 twelve magnetic pole teeth are arranged in order from a first tooth to a twelfth tooth in a first circumferential direction, which is one of the circumferential directions, The first portion of one of the three phases is formed 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, the nozzle is inserted into the second slot from the second end face side, Then, winding the conductor around the fourth tooth in the first direction; Thereafter, the nozzle is pulled out to the first end surface side of the second slot. By forming a winding method for a stator, the windings for each of the three phases being positioned in the circumferential direction differently by one magnetic pole tooth.

8. 8. A stator winding method according to claim 7, comprising the steps of: the first slot is between the first tooth and the second tooth; The second slot is located between the fourth tooth and the third tooth.

9. 8. A stator winding method according to claim 7, comprising the steps of: the first slot is between the first tooth and the twelfth tooth; The second slot is located between the fourth tooth and the fifth tooth.

10. After the three-phase winding is wound around the stator core by the stator winding method according to any one of claims 7 to 9, The winding end ends of the first and second portions of each phase are all connected to a common neutral point, For each phase, each winding start end of the first portion and the second portion is connected to a power source of the corresponding 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.

11. 2. A stator winding method according to claim 1, comprising the steps of: A slot is formed between adjacent said pole teeth, One of two axial end faces of the stator core is a first end face, When the twelve magnetic pole teeth are arranged in order from a first tooth to a twelfth tooth in a first circumferential direction, which is one of the circumferential directions, The first portion of one of the three phases is formed 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 a second tooth from the first end face side; Then, winding the conductor around the second tooth in a first direction; Subsequently, the conductor is wound around the first tooth in a second direction opposite to the first direction; Thereafter, winding around the first tooth is completed in a second slot adjacent to the first slot, and the nozzle is pulled out to the first end face side of the second slot. The present invention relates to a stator winding method and a method for winding a stator.

12. 12. A stator winding method according to claim 11, comprising the steps of: the first slot is between the second tooth and the third tooth; The second slot is located between the first tooth and the second tooth.

13. 12. A stator winding method according to claim 11, comprising the steps of: the first slot is between the second tooth and the first tooth; The second slot is located between the first tooth and the twelfth tooth.

14. After the three-phase winding is wound around the stator core by the stator winding method according to any one of claims 11 to 13, a winding end side end wire of the first portion and a winding start side end wire of the second portion of each phase are all connected to a common neutral point, For each phase, a winding start end wire of the first portion and a winding end end wire of the second portion are connected to a power source of the corresponding phase, A method for manufacturing a stator, comprising connecting two coils for each phase in parallel, the coils being wound in series around two adjacent ones of the magnetic pole teeth, and forming a star connection in which the winding direction of the coils differs for each magnetic pole tooth.

15. a stator core having 12 magnetic pole teeth at equal angular intervals on an inner periphery thereof and having slots between 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; The windings of the three phases have a common conductor winding method around the magnetic pole teeth, but are positioned differently in the circumferential direction of the stator core, each of the windings for each phase includes a first portion and a second portion that have a common winding method for the conductor around the magnetic pole teeth and are positioned in the circumferential direction different from each other by half a circumference; 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 a first tooth to a twelfth tooth in a first circumferential direction, which is one of the circumferential directions, 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, a lead-out portion is formed on the first end face side, the 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 being further drawn into the second slot from the first end face side again, Next, the wire is wound around the fourth tooth in a second direction opposite to the first direction, Next, the third slot is adjacent to the fourth tooth and is extended toward the first end surface side of the third slot opposite to the second slot. A stator comprising:

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

17. 16. A stator according to claim 15, the first slot is between the first tooth and the twelfth tooth; The second slot is located between the fourth tooth and the fifth tooth.

18. 16. A stator according to claim 15, 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;

19. 19. A stator according to any one of claims 15 to 18, 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 portion and a second portion, each of which is joined together for each phase to form a lead portion for connection to a power source for that phase.

20. a stator core having 12 magnetic pole teeth at equal angular intervals on an inner periphery thereof and having slots between 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; The windings of the three phases have a common conductor winding method around the magnetic pole teeth, but are positioned differently in the circumferential direction of the stator core, each of the windings for each phase includes a first portion and a second portion that have a common winding method for the conductor around the magnetic pole teeth and are positioned in the circumferential direction different from each other by half a circumference; 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 a first tooth to a twelfth tooth in a first circumferential direction, which is one of the circumferential directions, 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, 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 second slot is pulled out toward the first end face side. And, a stator including a winding for each of the three phases, the winding being positioned in the circumferential direction at a distance corresponding to one of the magnetic pole teeth;

21. 21. A stator according to claim 20, the first slot is between the first tooth and the second tooth; The second slot is located between the fourth tooth and the third tooth.

22. 21. A stator according to claim 20, the first slot is between the first tooth and the twelfth tooth; The second slot is located between the fourth tooth and the fifth tooth.

23. 23. A stator according to any one of claims 20 to 22, The winding end ends of the first and second parts of each phase are all connected to a common neutral point, a lead portion for connecting the winding start end wires of the first portion and the second portion to a power source for the corresponding phase is formed by gathering the winding start end wires of the first portion and the second portion for each phase.

24. a stator core having 12 magnetic pole teeth at equal angular intervals on an inner periphery thereof and having slots between 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; The windings of the three phases have a common conductor winding method around the magnetic pole teeth, but are positioned differently in the circumferential direction of the stator core, each of the windings for each phase includes a first portion and a second portion that have a common winding method for the conductor around the magnetic pole teeth and are positioned in the circumferential direction different from each other by half a circumference; 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 a first tooth to a twelfth tooth in a first circumferential direction, which is one of the circumferential directions, In the first portion of one of the three phases, the conductor The first tooth is drawn into a first slot adjacent to the second tooth from the first end surface side, Next, the wire is wound around the second tooth in a first direction, Subsequently, the wire is wound around the first tooth in a second direction opposite to the first direction, The wire is wound around the first tooth in a second slot adjacent to the first slot, and is then pulled out to the first end face side of the second slot. A stator comprising:

25. 25. A stator according to claim 24, the first slot is between the second tooth and the third tooth; The second slot is between the first tooth and the second tooth.

26. 25. A stator according to claim 24, the first slot is between the second tooth and the first tooth; The second slot is located between the first tooth and a twelfth tooth.

27. 27. A stator according to any one of claims 24 to 26, a winding end side wire of the first portion and a winding start side wire of the second portion of each phase are all connected to a common neutral point, a winding start end wire of the first portion and a winding end end wire of the second portion for each phase are gathered together to form a lead portion for connection to a power source for that phase.

28. A rotating electric machine comprising the stator according to any one of claims 15 to 18, 20 to 22, and 24 to 26.

Images