Stator

Abstract

To lead out an end portion of a winding end of a coil to the outside of a stator core by using a short bus bar having a simple configuration.SOLUTION: A stator comprises: a stator core in which a plurality of slots is formed; and a coil which is an open winding and in which one pole of one phase consists of (n) ((n) is an even number) pieces of slots, the number of phases is (m) ((m) is 2 or 3), an end portion of a winding start is electrically joined with a wire inserted into a turn of an outermost diameter of the slot, an end portion of a winding end is electrically joined with a wire inserted into a turn of the outermost diameter of the slot, and a wire wound to the end of a turn of the innermost diameter of the slot is electrically joined with a wire inserted into a slot deviated from the slot, into which the relevant wire is inserted, by (n-1)×m-1 pieces of wires in a winding direction or an opposite direction of the winding direction in the turn of the innermost diameter of the slot.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stator for a rotating electrical machine. [Background technology]

[0002] In recent years, research and development has been conducted on miniaturization, weight reduction, yield improvement, and other technologies that contribute to energy efficiency, in order to ensure that more people have access to affordable, reliable, sustainable, and advanced energy. For example, electric vehicles (EVs) are powered solely by motors and therefore have the advantage of not emitting carbon dioxide, nitrogen oxides, and the like while running, and are expected to be the next generation of automobiles. Therefore, technologies related to improving the energy efficiency of motors installed in EVs and the like have been developed. For example, a rotating electric machine disclosed in Patent Document 1 is one example of such technology. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3621635 Summary of the Invention [Problem to be solved by the invention]

[0004] In the rotating electric machine described above, the end of the armature winding wound around the armature core is inserted into the innermost turn of the slot, and therefore, in order to connect the end of the armature winding to the drive circuit, it is necessary to use a complex and long bus bar to pull the end from the innermost turn of the slot to the outside of the armature core.

[0005] However, because the rotating electric machine described above has such a structure, stress applied to the bus bar due to vibration or the like is amplified by the principle of leverage, and may be applied to the portion where the end of the armature winding is welded to the bus bar. Furthermore, because the rotating electric machine described above requires a complex and long bus bar, a large amount of material is required to manufacture the bus bar, which reduces the yield of the bus bar and makes it difficult to reduce the size of the machine.

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide a stator that enables the end of the coil winding to be drawn to the outside of the stator core using a short bus bar with a simple structure, thereby contributing to energy efficiency. [Means for solving the problem]

[0007] In order to achieve the above object, the stator according to claim 1 comprises a stator core in which a plurality of slots are formed, and a coil having an open winding, in which one pole of one phase is composed of n (n: even number) slots, the number of phases is m (m: 2 or 3), the winding start end is electrically connected to a wire inserted in the outermost turn of the slot, the winding end is electrically connected to the wire inserted in the outermost turn of the slot, and the wire wound to the end of the innermost turn of the slot is electrically connected to a wire inserted in a slot shifted (n-1) × m-1 lines in the winding direction or opposite to the winding direction from the slot in which the wire is inserted in the innermost turn of the slot.

[0008] As a result, the stator according to claim 1 can shorten the busbar that pulls out the winding end portions of the four coils from the outermost diameter of the stator core. Therefore, the stator according to claim 1 can suppress the stress that is generated by vibration, etc., amplified by the principle of leverage, and applied to the busbar. The stator according to claim 1 also reduces the amount of material required to manufacture the busbar, improving the yield of the busbar. Furthermore, the stator according to claim 1 can make the busbar simple and short, making it easy to miniaturize a two-phase motor.

[0009] The stator according to claim 2 comprises a stator core in which a plurality of slots are formed in which a wire can be wound around p (p: even number) turns; and a coil in which one pole of one phase is composed of n (n: even number) slots, the coil having an end at the start of winding electrically connected to the wire inserted in the first turn from the outer diameter side of the slot and an end at the end of winding inserted in the second turn from the outer diameter side of the slot, and when wound from the outer diameter side of the slot up to the pth turn and then folded back to the outer diameter side of the slot, the end is electrically connected to the wire inserted in the one turn outer diameter side of the slot shifted by n×2+1 lines in the winding direction, wound around the stator core once, and electrically connected to the wire inserted in the three turns outer diameter side of the slot shifted by n×2+2 lines in the winding direction.

[0010] As a result, the stator according to the second aspect can achieve the same effects as the stator according to the first aspect.

[0011] In a stator according to claim 3, the stator core is formed with a plurality of slots capable of winding a wire around p (p: an even number equal to or greater than 6) turns. Also, in a stator according to claim 3, the coil is further electrically joined to a wire inserted on the outer diameter side of a slot shifted by n×2−2 lines in the winding direction for three turns, wound around the stator core once, and electrically joined to a wire inserted on the outer diameter side of a slot shifted by n×2+2 lines in the winding direction for three turns, and this process is repeated until the coil is wound up to the second turn from the outer diameter side of the stator core.

[0012] As a result, the stator according to the third aspect can achieve the same effects as the stator according to the first aspect.

[0013] In the stator according to claim 4, the coil is an open winding, one pole of one phase is composed of n slots (n: even number), the number of phases is m (m: 2 or 3), and m × u × 2 terminals incorporated in u parallel circuits are arranged offset from each other in the direction of the rotor's rotation axis.

[0014] As a result, the stator according to claim 4 can ensure the insulation distance between the busbar and the terminal, the insulation distance between the busbars themselves, and the insulation distance between the terminals themselves, even when the end of the coil winding is pulled out to the outside of the stator core by a simple and short busbar.

[0015] In the stator according to claim 5, the coil is a bus bar that electrically connects a terminal incorporated in a u-parallel circuit to the winding start end or the winding end, and the bus bar is laid in a region that overlaps with the back yoke in the direction of the rotation axis of the rotor from the part where the bus bar starts to overlap with the back yoke of the stator core to the winding start end or the winding end.

[0016] As a result, the stator according to the third embodiment can reduce the size of the two-phase motor.

[0017] In the stator according to claim 6, the coil is an open winding, one pole of one phase is composed of n slots (n: even number), the number of phases is m (m: 2 or 3), and the slot into which the winding start end of a first phase is inserted and the slot into which the winding start end of a second phase different from the first phase is inserted are arranged at a distance of n × 2 slots or more.

[0018] As a result, the stator according to claim 6 can reduce the number of portions where the bus bars for leading the winding end portions of the coils out of the stator core overlap each other in a complex manner in the direction of the rotation axis A. Therefore, the stator according to claim 6 can easily make the two-phase motor smaller. [Brief explanation of the drawings]

[0019] [Figure 1] 3A to 3C are diagrams illustrating an example of how to wind a coil and join it using a bus bar according to the first embodiment. [Figure 2] 10A to 10C are diagrams illustrating an example of a coil winding method and joining using a bus bar according to a second embodiment. [Figure 3] 10A and 10B are diagrams illustrating an example of the arrangement of terminals according to the third embodiment. [Figure 4] FIG. 10 is a diagram illustrating an example of the positional relationship between a slot into which the winding start end of a first phase is inserted and a slot into which the winding start end of a second phase is inserted according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the first to fourth embodiments, a two-phase motor will be described as an example of a rotating electric machine according to the present invention. This motor is mounted on an electric vehicle, for example, to rotate the tires of the electric vehicle.

[0021] (First embodiment) The two-phase motor according to the first embodiment includes a stator and a rotor. The stator includes a stator core and a coil.

[0022] The stator core is a cylindrical component with multiple teeth and slots formed on its interior. The teeth are the parts of the stator core that extend toward the rotation axis A of the rotor, and the shape and dimensions of the cross section of any plane perpendicular to the rotation axis A are the same regardless of the position where the plane intersects with the rotation axis A. The slot is the space sandwiched between two adjacent teeth in the circumferential direction of a circle centered on a point on the rotation axis A and located on any plane perpendicular to the rotation axis A.

[0023] The coils are wires wound around the teeth. Specifically, the coils are made up of U-shaped rectangular wires inserted into two slots, with the ends of the wires electrically connected to the ends of other U-shaped rectangular wires, and are wound around the entire stator core. The coils are open windings with both ends connected to the inverter circuit, and when energized by the inverter circuit, they generate magnetic force to rotate the rotor around the rotation axis A.

[0024] FIG. 1 is a diagram showing an example of how to wind coils and how they are joined by bus bars according to the first embodiment. FIG. 1 shows an example in which one pole of one phase is composed of an even number of slots, n=4, and there are m=2 phases. Therefore, the two-phase motor according to the first embodiment includes coils α1 and α2 that form the α phase, and coils β1 and β2 that form the β phase. Note that FIG. 1 mainly shows an example of how to wind coil α1 and how they are joined by bus bars.

[0025] Each square in the first row from the top of Figure 1 indicates the slot number assigned to each slot formed in the stator core. As shown in the first row from the top of Figure 1, the stator core has 64 slots. Each square in the second to ninth rows from the top of Figure 1 indicates the position where one end of the U-shaped rectangular wire is inserted into each slot. The position numbers written in these squares indicate the order in which the rectangular wire forming the coil for each phase passes through.

[0026] The squares with dotted hatching indicate the positions where the rectangular wire that makes up coil α1 is inserted. The squares with vertical hatching indicate the positions where the rectangular wire that makes up coil α2 is inserted. The squares with thick diagonal hatching indicate the positions where the rectangular wire that makes up coil β1 is inserted. The squares with light diagonal hatching indicate the positions where the rectangular wire that makes up coil β2 is inserted.

[0027] 1 indicate the first turn, second turn, ..., and eighth turn, respectively, from the outer diameter side to the inner diameter side of the stator core. The term "turn" used here refers to 64 squares located at a certain distance from the outer diameter side of the stator core in the radial direction of a circle centered on a point on the rotation axis A and located on a plane perpendicular to the rotation axis A.

[0028] The solid lines in Figure 1 indicate that the curved portions of the U-shaped rectangular wire protrude from the back to the front of the page in Figure 1. The dotted lines in Figure 1 indicate that the ends of the U-shaped rectangular wire protrude from the front to the back of the page in Figure 1. The dashed-dotted lines in Figure 1 indicate bus bars that electrically connect the ends of the U-shaped rectangular wire. The white circles in Figure 1 indicate the welded portions that electrically connect the ends of the U-shaped rectangular wire.

[0029] With reference to FIG. 1, a specific example of how to wind the coil α1 and join it with a bus bar, and the start and end of winding the coil α2, coil β1, and coil β2 will be described.

[0030] As shown in Figure 1, the starting end α1in of coil α1 is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 48, near the position of the first turn of slot number 44, which is lightly hatched.

[0031] Coil α1 is equipped with a rectangular wire whose end located on the right side in FIG. 1 is inserted at position number 1 in the first turn, and whose end located on the left side in FIG. 1 is inserted at position number 2 in the second turn. Coil α1 is equipped with a rectangular wire whose end located on the right side in FIG. 1 is inserted at position number 3 in the first turn and is electrically connected to the end of the rectangular wire inserted at position number 2, and whose end located on the left side in FIG. 1 is inserted at position number 4 in the second turn.

[0032] Coil α1 comprises a rectangular wire whose end located on the right side in FIG. 1 is inserted at position 5 of the first turn and is electrically joined to the end of the rectangular wire inserted at position 4, and whose end located on the left side in FIG. 1 is inserted at position 6 of the second turn. Coil α1 comprises a rectangular wire whose end located on the right side in FIG. 1 is inserted at position 7 of the first turn and is electrically joined to the end of the rectangular wire inserted at position 6, and whose end located on the left side in FIG. 1 is inserted at position 8 of the second turn.

[0033] The coil α1 is wound around the stator core on the first and second turns using the four rectangular wires described above. The coil α1 is wound around the stator core on the third to eighth turns using the same structure as described above. From the winding start position of the coil α1 to position 64, the winding direction is from right to left in FIG. 1. From the winding start position of the coil α1 to position 64, the winding direction is opposite to the winding direction, from left to right in FIG. 1.

[0034] Coil α1 includes a busbar that electrically connects the wire wound to the end of the innermost turn of the slot with a wire inserted in a slot that is shifted (n-1) × m-1 turns in the opposite direction to the winding direction from the slot into which the wire was inserted in the innermost turn of the slot. Specifically, coil α1 includes a busbar that electrically connects the end of the rectangular wire inserted at position 64 with the end of the rectangular wire inserted at position 65, which is shifted (4-1) × 2-1 = 5 turns to the right from the slot into which the wire was inserted.

[0035] This busbar is electrically connected to the end of the rectangular wire inserted at position 64 near the 8th turn of slot 44. This busbar is also electrically connected to the end of the rectangular wire inserted at position 65 near the 8th turn of slot 39. This busbar is shown by a dashed line in Figure 1.

[0036] Coil α1 comprises a rectangular wire whose end located on the left side in FIG. 1 is inserted at position 65 of the 8th turn, and whose end located on the right side in FIG. 1 is inserted at position 66 of the 7th turn. Coil α1 comprises a rectangular wire whose end located on the left side in FIG. 1 is inserted at position 67 of the 8th turn and is electrically connected to the end of the rectangular wire inserted at position 66, and whose end located on the right side in FIG. 1 is inserted at position 68 of the 7th turn.

[0037] Coil α1 comprises a rectangular wire whose end located on the left side in FIG. 1 is inserted at position 69 of the 8th turn and is electrically joined to the end of the rectangular wire inserted at position 68, and whose end located on the right side in FIG. 1 is inserted at position 70 of the 7th turn. Coil α1 comprises a rectangular wire whose end located on the left side in FIG. 1 is inserted at position 71 of the 8th turn and is electrically joined to the end of the rectangular wire inserted at position 70, and whose end located on the right side in FIG. 1 is inserted at position 72 of the 7th turn.

[0038] Coil α1 is wound around the 8th and 7th turns of the stator core using the four rectangular wires described above. Coil α1 is wound around the 6th to 1st turns of the stator core using the same structure as described above. From position 65 to the end of coil α1's winding, the winding direction is from left to right in FIG. 1. From position 65 to the end of coil α1's winding, the winding direction is opposite, from right to left in FIG. 1.

[0039] As shown in Figure 1, the end α1out of the end of the winding of coil α1 is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 43, near the position of the first turn of slot number 128, which is hatched with thick diagonal lines.

[0040] As shown in Figure 1, the starting end α2in of coil α2 is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 35, near the position of the first turn of slot number 31, which is hatched with dark diagonal lines.

[0041] Coil α2 is first wound in the same manner as coil α1, from right to left in FIG. 1, until the last turn on the innermost radius of the slot. Next, coil α2 has its winding direction reversed from left to right in FIG. 1 by the same bus bar as coil α1. Then, coil α2 is wound in the same manner as coil α1, from left to right in FIG. 1, until the last turn on the outermost radius of the slot.

[0042] As shown in Figure 1, the end α2out of the end of the winding of coil α2 is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 40, near the position of the first turn of slot number 36, which is hatched with thick diagonal lines.

[0043] As shown in Figure 1, the starting end β1in of coil β1 is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 44, near the position of the first turn of slot number 128, which is hatched with vertical lines.

[0044] Coil β1 is first wound in the same manner as coil α1, from right to left in FIG. 1, until the last turn on the innermost radius of the slot. Next, coil β1 has its winding direction reversed from left to right in FIG. 1 by the same bus bar as coil α1. Then, coil β1 is wound in the same manner as coil α1, from left to right in FIG. 1, until the last turn on the outermost radius of the slot.

[0045] As shown in Figure 1, the end β1out of the end of coil β1 is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 39, near the position of the first turn of slot number 35, which is vertically hatched.

[0046] As shown in Figure 1, the starting end β2in of coil β2 is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 31, near the position of the first turn of slot number 28, which is lightly hatched.

[0047] Coil β2 is first wound in the same manner as coil β1, from right to left in FIG. 1, until the end of the innermost turn of the slot. Next, coil β2 is reversed in winding direction from left to right in FIG. 1 by the same bus bar as coil β1. Then, coil β2 is wound in the same manner as coil β1, from left to right in FIG. 1, until the end of the outermost turn of the slot.

[0048] As shown in Figure 1, the end β2out of the end of coil β2 is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 36, near the position of the first turn of slot number 33, which is lightly hatched.

[0049] The two-phase motor according to the first embodiment has been described above. The two-phase motor according to the first embodiment includes coils α1, α2, β1, and β2, which are open windings. Each pole of each phase is formed by an even number of slots, n=4, and the number of phases is m=2. The winding start ends of these four coils are electrically connected to the wire inserted in the outermost turn of the slot, and the winding end ends are electrically connected to the wire inserted in the outermost turn of the slot. In addition, these four coils include a bus bar that electrically connects the wire wound to the end of the innermost turn of the slot to the wire inserted in the slot five turns away from the slot into which the wire was inserted in the innermost turn of the slot, in the opposite direction to the winding direction.

[0050] As a result, the two-phase motor according to the first embodiment can shorten the busbars that extend the winding ends of the four coils from the outermost diameter of the stator core. Therefore, the two-phase motor according to the first embodiment can suppress stresses that are generated by vibrations or the like and amplified by the leverage principle and applied to the busbars. Furthermore, the two-phase motor according to the first embodiment can reduce the amount of material required to manufacture the busbars, thereby improving the yield of the busbars. Furthermore, the two-phase motor according to the first embodiment can use simple and short busbars, making it easy to miniaturize the two-phase motor.

[0051] In the first embodiment, the coil α1 is described as including a busbar that electrically connects the wire wound to the end of the innermost turn of the slot and the wire inserted into a slot that is offset (n-1) × m-1 turns in the opposite winding direction from the slot into which the wire is inserted in the innermost turn of the slot, but this is not limited to this. That is, depending on the winding method, the coil α1 may also include a busbar that electrically connects the wire wound to the end of the innermost turn of the slot and the wire inserted into a slot that is offset (n-1) × m-1 turns in the winding direction from the slot into which the wire is inserted in the innermost turn of the slot.

[0052] Second Embodiment The two-phase motor according to the second embodiment includes a stator core different from that of the first embodiment and coils wound in a different manner from that of the first embodiment. Therefore, in the description of the second embodiment, differences from the above-described embodiments will be mainly described, and descriptions of overlapping portions with the above-described embodiments will be omitted as appropriate.

[0053] The stator core has a plurality of slots formed therein, each capable of winding a wire for p turns (p: an even number equal to or greater than 6). For example, in the second embodiment, the stator core has a plurality of slots formed therein, each capable of winding a wire for p=8 turns.

[0054] FIG. 2 is a diagram showing an example of how coils are wound and joined by bus bars according to the second embodiment. FIG. 2 shows an example in which one pole of one phase is composed of an even number of slots, n=4, and there are m=2 phases. Therefore, the two-phase motor according to the first embodiment includes coils α1 and α2 that form the α phase, and coils β1 and β2 that form the β phase. Note that FIG. 2 mainly shows an example of how coil α1 is wound and joined by bus bars. The notation used in FIG. 2 is the same as that used in FIG. 1.

[0055] With reference to FIG. 2, a specific example of how to wind the coil α1 and join it with the bus bar, and the start and end of winding the coil α2, coil β1, and coil β2 will be described.

[0056] As shown in Figure 2, the starting end α1in of coil α1 is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 48, near the position of the first turn of slot number 44, which is lightly hatched.

[0057] Coil α1 is equipped with a rectangular wire whose end located on the right side in Fig. 2 is inserted at position number 1 in the first turn, and whose end located on the left side in Fig. 2 is inserted at position number 2 in the second turn. Coil α1 is equipped with a rectangular wire whose end located on the right side in Fig. 2 is inserted at position number 3 in the first turn and is electrically connected to the end of the rectangular wire inserted at position number 2, and whose end located on the left side in Fig. 2 is inserted at position number 4 in the second turn.

[0058] Coil α1 comprises a rectangular wire whose end located on the right side in FIG. 2 is inserted at position 5 of the first turn and is electrically joined to the end of the rectangular wire inserted at position 4, and whose end located on the left side in FIG. 2 is inserted at position 6 of the second turn. Coil α1 comprises a rectangular wire whose end located on the right side in FIG. 2 is inserted at position 7 of the first turn and is electrically joined to the end of the rectangular wire inserted at position 6, and whose end located on the left side in FIG. 2 is inserted at position 8 of the second turn.

[0059] Coil α1 is wound around the stator core on the first and second turns using the four rectangular wires described above. Coil α1 is wound around the stator core on the third to eighth turns using the same structure as described above. The winding direction of coil α1 from the start to the end of its winding is from right to left in FIG. 2. The winding direction of coil α1 from the start to the end of its winding is opposite to the winding direction of coil α1 from left to right in FIG. 2.

[0060] When the coil α1 is wound from the outer diameter side of the slot up to the pth turn and then folded back to the outer diameter side of the slot, it is electrically connected to a bus bar that is inserted into the slot one turn away from the slot, offset by n×2+1 wires in the winding direction. Specifically, when the coil α1 is wound from the outer diameter side of the slot up to the 8th turn and then folded back to the outer diameter side of the slot, it is electrically connected to a wire that is inserted into the slot one turn away from the slot, offset by n×2+1=4×2+1=9 wires in the winding direction. This connection is achieved by three bus bars, as shown by the dashed lines in Figure 2.

[0061] The first bus bar is located on the left side in FIG. 2 and electrically connects the end of the rectangular wire inserted at position 64 in slot 40 to the end of the second bus bar located on the right side in FIG. 2. The second bus bar electrically connects the end of the first bus bar located on the left side in FIG. 2 to the end of the third bus bar located on the right side in FIG. 2. The third bus bar electrically connects the end of the second bus bar located on the left side in FIG. 2 to the end of the rectangular wire inserted at position 65 in slot 49 on the right side in FIG. 2. Then, coil α1 is wound one turn around the stator core.

[0062] The coil α1 includes a busbar electrically connected to a wire inserted into the outer diameter of three turns of slots offset by n×2+2 lines in the winding direction. Specifically, the coil α1 is electrically connected to a wire inserted into the outer diameter of three turns of slots offset by n×2+2=4×2+2=10 lines in the winding direction. This connection is realized by three busbars, as shown by the dashed lines in Figure 2.

[0063] The first busbar is located on the left side in FIG. 2 and electrically connects the end of the rectangular wire inserted at position 80 in slot 41 to the end of the second busbar located near the eighth turn in slot 45. The second busbar electrically connects the end of the first busbar located on the left side in FIG. 2 and the end of the third busbar located on the right side in FIG. 2. The third busbar electrically connects the end of the second busbar located near the fifth turn in slot 47 to the end of the rectangular wire inserted at position 81 in slot 51 on the right side in FIG. 2.

[0064] The coil α1 further includes bus bars electrically connected to wires inserted on the outer diameter side of three turns of slots offset by n×2−2 in the winding direction. Specifically, the coil α1 is electrically connected to wires inserted on the outer diameter side of three turns of slots offset by n×2−2=4×2−2=6 in the winding direction. This connection is realized by three bus bars, as shown by the dashed lines in FIG. 2.

[0065] The first busbar is located on the left side in FIG. 2 and electrically connects the end of the rectangular wire inserted at position 96 in slot 43 to the end of the second busbar located near the sixth turn in slot 47. The second busbar electrically connects the end of the first busbar located on the left side in FIG. 2 to the end of the third busbar located near the third turn in slot 45. The third busbar electrically connects the end of the second busbar located near the third turn in slot 45 to the end of the rectangular wire inserted at position 97 in slot 49 on the right side in FIG. 2. Then, coil α1 is wound one turn around the stator core.

[0066] The coil α1 includes a busbar electrically connected to a wire inserted into the outer diameter of three turns of slots offset by n×2+2 lines in the winding direction. Specifically, the coil α1 is electrically connected to a wire inserted into the outer diameter of three turns of slots offset by n×2+2=4×2+2=10 lines in the winding direction. This connection is realized by three busbars, as shown by the dashed lines in Figure 2.

[0067] The first busbar is located on the left side in FIG. 2 and electrically connects the end of the rectangular wire inserted at slot position 112 in slot number 41 to the end of the second busbar located near the fourth turn in slot number 45. The second busbar electrically connects the end of the first busbar located on the left side in FIG. 2 to the end of the third busbar located near the fourth turn in slot number 45. The third busbar electrically connects the end of the second busbar located near the first turn in slot number 47 to the end of the rectangular wire inserted at slot position 113 in slot number 51 on the right side in FIG. 2.

[0068] The coil α1 is wound up to the second turn from the outer diameter side of the stator core by repeating the above-described structure.

[0069] As shown in Figure 2, the end α1out of the end of the winding of coil α1 is electrically connected to the end of the rectangular wire inserted into slot number 43 at the second turn from the outer diameter side, near the position of the second turn of slot number 47, which is hatched with dark diagonal lines.

[0070] As shown in Figure 2, the winding start end α2in of coil α2 is electrically connected to the end of the rectangular wire inserted in the second turn of slot number 35, near the position of the second turn of slot number 39 (lightly hatched). Coil α2 has the same busbar as coil α1 and is wound around the stator core in the same manner as coil α1. As shown in Figure 2, the winding end end α2out of coil α2 is electrically connected to the end of the rectangular wire inserted in the first turn, the outermost turn of slot number 40, near the position of the first turn of slot number 36 (thickly hatched).

[0071] As shown in Fig. 2, the winding start end β1in of coil β1 is electrically connected to the end of the rectangular wire inserted in the first turn, which is the outermost turn, of slot number 12, near the position of the first turn of slot number 8 (vertical hatching). Coil β1 has the same busbar as coil α1 and is wound around the stator core in the same manner as coil α1. As shown in Fig. 2, the winding end end β1out of coil β1 is electrically connected to the end of the rectangular wire inserted in the second turn of slot number 7, near the position of the second turn of slot number 11 (dot hatching).

[0072] As shown in Fig. 2, the winding start end β2in of coil β2 is electrically connected to the end of the rectangular wire inserted in the second turn of slot number 63, near the position of the second turn of slot number 3 (vertical hatching). Coil β2 has the same busbar as coil α1 and is wound around the stator core in the same manner as coil α1. As shown in Fig. 2, the winding end end β2out of coil β2 is electrically connected to the end of the rectangular wire inserted in the first turn, the outermost turn of slot number 4, near the position of the first turn of slot number 64 (dot hatching).

[0073] The above has described the two-phase motor according to the second embodiment. The two-phase motor according to the second embodiment includes a stator core having a plurality of slots formed therein, each slot capable of winding a wire around p turns (p is an even number equal to or greater than 6).

[0074] The two-phase motor according to the second embodiment includes open windings, coils α1, α2, β1, and β2, with one pole of one phase being formed by an even number of slots, n=4, and the number of phases is m=2. The winding start ends of these four coils are electrically connected to the wire inserted in the first turn from the outer diameter side of the slot, and the winding end ends are electrically connected to the wire inserted in the second turn from the outer diameter side of the slot.

[0075] Furthermore, when these four coils are wound up to the eighth turn from the outer diameter side of the slot and then folded back to the outer diameter side of the slot, they are electrically joined to a wire inserted one turn outside the slot, 4 x 2 + 1 = 9 wires offset in the winding direction.Furthermore, after these four coils are wound once around the stator core, they are joined to a wire inserted three turns outside the slot, 4 x 2 + 2 = 10 wires offset in the winding direction.

[0076] As a result, the two-phase motor according to the second embodiment can achieve the same effects as the two-phase motor according to the first embodiment.

[0077] Furthermore, when the stator core has multiple slots capable of winding wire for p turns (p: an even number equal to or greater than 6), these four coils are wound as follows: These four coils are further electrically connected to wire inserted three turns into the outer diameter of slots offset by n × 2 - 2 turns in the winding direction. Furthermore, after these four coils are wound once around the stator core, they are electrically connected to wire inserted three turns into the outer diameter of slots offset by 4 × 2 + 2 = 10 turns in the winding direction. These four coils are wound up to the second turn from the outer diameter side of the stator core by repeating the above-described structure.

[0078] As a result, the two-phase motor according to the second embodiment can achieve the same effects as the two-phase motor according to the first embodiment, even if the stator core has multiple slots that can accommodate p turns of wire (p: an even number greater than or equal to 6).

[0079] In the second embodiment, the stator core is described as having a plurality of slots formed therein that allow winding of wire around p turns (p is an even number equal to or greater than 6), but this is not limiting. The stator core according to the second embodiment may have a plurality of slots formed therein that allow winding of wire around p turns (p is an even number). Therefore, the stator core according to the second embodiment may have a plurality of slots formed therein that allow winding of wire around 2 turns or 4 turns.

[0080] (Third embodiment) The two-phase motor according to the third embodiment includes a stator core similar to that of the first or second embodiment and coils wound in the same manner as that of the first or second embodiment. However, the two-phase motor according to the third embodiment includes terminals arranged in a manner different from that of the above-described embodiments. Therefore, the description of the third embodiment will focus on differences from the above-described embodiments, and will omit a description of overlapping details with the above-described embodiments as appropriate.

[0081] Fig. 3 is a diagram showing an example of terminal arrangement according to the third embodiment. As shown in Fig. 3, the two-phase motor according to the third embodiment includes a stator core 10, terminals 31, 32, ..., and 38, and bus bars 41, 42, ..., and 48. The stator core 10 is similar to the stator core according to the first embodiment or the stator core according to the second embodiment. The coil is an open winding, and one pole of one phase is composed of n slots (n: even number), and the number of phases is m = 2.

[0082] Terminal 31, terminal 32, ... and terminal 38 are examples of m x u x 2 = 2 x 2 x 2 = 8 terminals incorporated into u = 2 parallel circuits.

[0083] Terminal 31 is a part of coil α1 and is electrically connected to the winding start end α1in of coil α1 via bus bar 41. Terminal 32 is a part of coil α1 and is electrically connected to the winding end α1out of coil α1 via bus bar 42. Terminal 33 is a part of coil α2 and is electrically connected to the winding start end α2in of coil α2 via bus bar 43. Terminal 34 is a part of coil α2 and is electrically connected to the winding end end α2out of coil α2 via bus bar 44.

[0084] Terminal 35 is a part of coil β1 and is electrically connected to the winding start end β1in of coil β1 via bus bar 45. Terminal 36 is a part of coil β1 and is electrically connected to the winding end β1out of coil β1 via bus bar 46. Terminal 37 is a part of coil β2 and is electrically connected to the winding start end β2in of coil β2 via bus bar 47. Terminal 38 is a part of coil β2 and is electrically connected to the winding end β2out of coil β2 via bus bar 48.

[0085] Furthermore, terminals 31, 32, ..., and 38 are arranged offset from one another in the direction of the rotation axis A of the rotor. Specifically, terminals 31, 32, ..., and 38 are arranged at positions different from the positions in the direction of the rotation axis A of terminals adjacent to them in the left-right direction of FIG. 3. For example, terminal 31 is located at a different position in the direction of the rotation axis A than terminal 32. Furthermore, for example, terminal 35 is located at a different position in the direction of the rotation axis A than terminals 34 and 36. The same applies to terminals other than terminals 31 and 35.

[0086] As shown in Fig. 4, bus bar 41 is laid in a region where the bus bar 41 overlaps with the back yoke of the stator core in the direction of rotation axis A from the portion where the bus bar 41 starts to overlap with the back yoke of the stator core in the direction of rotation axis A to winding start end α1in. The back yoke is a portion of the stator core that is farther from the rotation axis A than the portion of the stator core where the slots are formed. The portion where the bus bar 41 starts to overlap with the back yoke of the stator core in the direction of rotation axis A is the portion where the back yoke and bus bar 41 first overlap in the direction of rotation axis A when tracing bus bar 41 from terminal 31 toward the slots.

[0087] 4, the bus bar 42 is laid in a region where the bus bar 42 overlaps with the back yoke in the direction of the rotation axis A from the part where it starts to overlap with the back yoke of the stator core in the direction of the rotation axis A to the end α1out of the winding. The part where the bus bar 42 starts to overlap with the back yoke of the stator core in the direction of the rotation axis A is the part where the back yoke and bus bar 42 first overlap in the direction of the rotation axis A when tracing the bus bar 42 from the terminal 32 toward the slot.

[0088] The positional relationship between the bus bar 41 or bus bar 42 and the back yoke described above also applies to bus bar 43, bus bar 44, . . . and bus bar 48.

[0089] The above describes the two-phase motor according to the third embodiment. The two-phase motor according to the third embodiment includes coils in which m×u×2=2×2×2=8 terminals are incorporated into u=2 parallel circuits and are arranged offset from one another in the direction of the rotor's rotation axis.

[0090] As a result, in the two-phase motor according to the third embodiment, even when the end of the coil winding is pulled out to the outside of the stator core using a simple and short bus bar, it is possible to ensure the insulation distance between the bus bar and the terminal, the insulation distance between the bus bars, and the insulation distance between the terminals.

[0091] The two-phase motor according to the third embodiment also includes bus bar 41, bus bar 42, ..., and bus bar 48. These eight bus bars are laid in a region where the portions of the bus bars that begin to overlap with the back yoke in the direction of the rotation axis A, to the winding start end or winding end end, overlap with the back yoke in the direction of the rotation axis A.

[0092] As a result, the two-phase motor according to the third embodiment can be reduced in size.

[0093] (Fourth embodiment) The two-phase motor according to the fourth embodiment includes a stator core similar to that of the first or second embodiment and coils wound in the same manner as that of the first or second embodiment. However, the two-phase motor according to the fourth embodiment differs from the above-described embodiments in the positional relationship between the slot into which the winding start end of the first phase is inserted and the slot into which the winding start end of the second phase, which is different from the first phase, is inserted. Therefore, the description of the fourth embodiment will focus on the differences from the above-described embodiments, and will omit a description of the same details as those of the above-described embodiments.

[0094] FIG. 4 is a diagram showing an example of the positional relationship between the slot into which the winding start end of the first phase is inserted and the slot into which the winding start end of the second phase is inserted according to the fourth embodiment. As shown in FIG. 4, the two-phase motor according to the fourth embodiment includes a stator core 10, a slot S1, and a slot S5. The stator core 10 is the same as the stator core according to the first embodiment or the stator core according to the second embodiment. The coil is an open winding, and the number of phases, m, consisting of n (n: even number) slots, is 2.

[0095] The winding start end of the first phase coil is inserted into slot S1. Specifically, the winding start end α1in of the α-phase coil α1 is inserted into slot S1. The winding start end of the second phase coil, which is different from the first phase, is inserted into slot S5. Specifically, the winding start end β1in of the β-phase coil β1 is inserted into slot S5. As shown in FIG. 4, slots S1 and S5 are spaced apart by at least n×2=4×2=8 slots.

[0096] The above describes the two-phase motor according to the fourth embodiment. The two-phase motor according to the fourth embodiment includes a coil in which the slot S1 into which the winding start end α1in of the α-phase coil α1 is inserted and the slot S5 into which the winding start end β1in of the β-phase coil β1 is inserted are spaced apart by n×2=4×2=8 slots or more.

[0097] As a result, the two-phase motor according to the fourth embodiment can reduce the number of portions where the bus bars for leading the winding end portions of the coils out of the stator core overlap each other in a complex manner in the direction of the rotation axis A. Therefore, the two-phase motor according to the fourth embodiment can easily be made smaller.

[0098] In the above-described embodiment, the rotating electric machine according to the embodiment is a two-phase motor, i.e., the number of phases m is 2. However, the present invention is not limited to this. For example, the rotating electric machine according to the embodiment may be a three-phase motor. That is, the number of phases m of the rotating electric machine according to the embodiment may be 3.

[0099] In the above-described embodiment, the rotating electric machine according to the embodiment is a motor, but the present invention is not limited to this. The rotating electric machine according to the embodiment may be a generator that converts mechanical energy into electrical energy, instead of a motor that converts electrical energy into mechanical energy.

[0100] The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. In other words, the present invention includes embodiments in which various modifications, substitutions, design changes, etc. have been made based on the spirit of the present invention, and does not exclude these embodiments. [Explanation of symbols]

[0101] 10... Stator core 31, 32, 33, 34, 35, 36, 37, 38...Terminals A...Rotation axis S1, S5...Slots

Claims

1. a stator core having a plurality of slots formed therein; a coil having an open winding, in which one pole of one phase is composed of n slots (n: even number), the number of phases is m (m: 2 or 3), the winding start end is electrically connected to the wire inserted in the outermost turn of the slot, the winding end is electrically connected to the wire inserted in the outermost turn of the slot, and the wire wound to the end of the innermost turn of the slot is electrically connected to the wire inserted in the slot shifted (n-1) x m-1 in the winding direction or opposite to the winding direction from the slot into which the wire is inserted in the innermost turn of the slot; A stator comprising:

2. a stator core having a plurality of slots formed therein, capable of winding a wire p turns (p: even number); a coil in which one pole of one phase is composed of n slots (n: even number), the winding start end is electrically connected to the wire inserted in the first turn from the outer diameter side of the slot, the winding end is electrically connected to the wire inserted in the second turn from the outer diameter side of the slot, and when wound from the outer diameter side of the slot up to p turns and then folded back to the outer diameter side of the slot, it is electrically connected to the wire inserted in the first turn outer diameter side of the slot shifted by n x 2 + 1 lines in the winding direction, wound once around the stator core, and electrically connected to the wire inserted in the third turn outer diameter side of the slot shifted by n x 2 + 2 lines in the winding direction; A stator comprising:

3. The stator core has a plurality of slots formed therein, each slot being capable of winding a wire around p turns (p is an even number equal to or greater than 6), The coil is further electrically connected to a wire inserted into the outer diameter side of the slots shifted by n×2−2 lines in the winding direction for three turns, wound around the stator core once, and then electrically connected to a wire inserted into the outer diameter side of the slots shifted by n×2+2 lines in the winding direction for three turns. This is repeated until the coil is wound from the outer diameter side of the stator core up to the second turn. The stator according to claim 2 .

4. The coil is an open winding, one pole of one phase is composed of n slots (n: even number), the number of phases is m (m: 2 or 3), and m × u × 2 terminals incorporated in u parallel circuits are arranged shifted from each other in the direction of the rotor rotation axis. The stator according to any one of claims 1 to 3.

5. The coil is a bus bar that electrically connects a terminal incorporated in a u-parallel circuit to a winding start end or a winding end, and the bus bar is laid in a region where the bus bar overlaps the back yoke in the direction of the rotation axis of the rotor from a portion where the bus bar starts to overlap the back yoke of the stator core to the winding start end or the winding end. The stator according to any one of claims 1 to 3.

6. The coil is an open winding, and one pole of one phase is composed of n slots (n: even number), the number of phases is m (m: 2 or 3), and the slot into which the winding start end of a first phase is inserted and the slot into which the winding start end of a second phase different from the first phase is inserted are arranged at a distance of n x 2 slots or more. The stator according to any one of claims 1 to 3.

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