Stator

Abstract

The present invention uses a short bus bar having a simple structure to lead out a winding end of a coil to the outside of a stator core. A stator is provided with: a stator core in which a plurality of slots are formed; and a coil that is an open winding, one pole of one phase of the coil is composed of n (n: even number) slots, the number of phases is m (m: 2 or 3), the winding start end is electrically joined to the wire inserted into the outermost turn of the slot, and the winding end is electrically joined to the wire inserted into the outermost turn of the slot. The coil electrically joins the last wire wound to the innermost turn of the slots and the wire inserted in slots shifted (n-1) * m-1 in the winding direction or in the direction opposite to the winding direction from the slot into which the wire is inserted in the innermost turn of the slots.

Description

Technical Field

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

[0002] In recent years, research and development efforts have focused on miniaturization, lightweighting, and improved yields that contribute to energy efficiency, ensuring that more people have access to appropriate, reliable, sustainable, and advanced energy. For example, electric vehicles (EVs), which use only electric motors as their power source, offer the advantage of not emitting carbon dioxide, nitrogen oxides, and other emissions during operation, making them highly anticipated as the next generation of vehicles. Consequently, technologies are being developed to improve the energy efficiency of electric motors installed in EVs and other vehicles. An example of such technology is the rotating electric machine disclosed in Patent Document 1.

[0003] Prior art literature Patent Literature Patent Document 1: Japanese Patent No. 3621635 Summary of the Invention Technical problem to be solved by the invention In the aforementioned rotating electric machine, the finished end of the armature winding wound around the armature core is inserted into the innermost turn of the slot. Therefore, in order to connect the finished end of the armature winding to the drive circuit, the aforementioned rotating electric machine requires the use of a complex and long busbar to lead the end from the innermost turn of the slot to the outside of the armature core.

[0004] However, due to the structure of the aforementioned rotating electric machine, stress applied to the busbar due to vibration or other factors may be amplified by the principle of leverage and applied to the portion where the busbar is welded to the end of the armature winding. Furthermore, because the aforementioned rotating electric machine requires a complex and long busbar, the production of the busbar requires a large amount of material, which reduces the busbar yield and makes miniaturization difficult.

[0005] The present invention was developed to solve the above-mentioned technical problems, and its purpose is to provide a stator that can lead the wound ends of the coils to the outside of the stator core using a short busbar with a simple structure. Furthermore, the present invention contributes to improved energy efficiency.

[0006] Technical solutions to technical problems To achieve the above-mentioned object, the stator involved in Technical Solution 1 includes: a stator core formed with a plurality of slots; and a coil, which is an open-end winding, wherein one pole of one phase is composed of n (n: an even number) slots, and the number of phases is m (m: 2 or 3), the end where winding begins is electrically connected to the wire of the turn inserted into the outermost diameter of the slot, the end where winding ends is electrically connected to the wire of the turn inserted into the outermost diameter of the slot, and the last wire wound to the turn of the innermost diameter of the slot is electrically connected to the wire inserted into the slot of the innermost diameter of the slot, which is offset from the slot where the wire is inserted in the winding direction or in the direction opposite to the winding direction by (n-1)×m-1.

[0007] Thus, the stator involved in Technical Solution 1 can shorten the busbar used to lead the ends of the winding of the above-mentioned four coils out from the outermost diameter of the stator core. Therefore, the stator involved in Technical Solution 1 can suppress the stress generated by vibration, etc. and amplified according to the lever principle and applied to the busbar. In addition, the stator involved in Technical Solution 1 can reduce the amount of material required to make the busbar, and can improve the yield rate of the busbar. Furthermore, the stator involved in Technical Solution 1 can set the busbar as a simple and short busbar, which can easily make the two-phase motor miniaturized.

[0008] The stator according to technical solution 2 comprises: a stator core having a plurality of slots formed therein on which a wire can be wound for p (p: an even number) turns; and a coil, wherein one pole of one phase is constituted by n (n: an even number) slots, the end portion where winding starts is electrically connected to the wire inserted from the outer diameter side of the slot to the first turn, and the end portion where winding ends is electrically connected to the wire inserted from the outer diameter side of the slot to the second turn. When the coil is wound from the outer diameter side of the slot to the pth turn and then folded back toward the outer diameter side of the slot, it is electrically connected to the wire inserted to the outer diameter side of one turn offset by n×2+1 slots in the winding direction. The coil is wound once around the stator core and is electrically connected to the wire inserted to the outer diameter side of three turns offset by n×2+2 slots in the winding direction.

[0009] Therefore, the stator according to claim 2 can achieve the same effects as the stator according to claim 1 .

[0010] In the stator according to claim 3, the stator core is formed with a plurality of slots capable of winding a wire for p turns (p is an even number of 6 or greater). Furthermore, in the stator according to claim 3, the coil is electrically bonded to a wire inserted into the outer diameter side of three turns offset by n×2-2 slots in the winding direction. After completing one turn around the stator core, the coil is electrically bonded to a wire inserted into the outer diameter side of three turns offset by n×2+2 slots in the winding direction. This structure is repeated, winding the coil from the outer diameter side of the stator core to the second turn.

[0011] Therefore, the stator according to claim 3 can achieve the same effects as the stator according to claim 1 .

[0012] In the stator involved in technical solution 4, the coil is an open winding, one pole of one phase is composed of n (n: an even number) slots, the number of phases is m (m: 2 or 3), and the m×u×2 terminals assembled in the u-parallel circuit are arranged in a staggered manner in the direction of the rotor's rotation axis.

[0013] Therefore, the stator involved in Technical Solution 4 can ensure the insulation distance between the busbar and the terminal, the insulation distance between the busbars, and the insulation distance between the terminals even when the end of the coil winding is led out to the outside of the stator core by a simple and short busbar.

[0014] In the stator involved in Technical Solution 5, the coil has a busbar, which electrically connects the terminal of the u-parallel circuit assembled with the end where winding starts or the end where winding ends, and the busbar is laid in the area overlapping with the back yoke in the direction of the rotating axis of the rotor from the part where the back yoke of the stator core starts to overlap in the direction of the rotating axis to the end where the winding starts or the end where winding ends.

[0015] Therefore, the stator according to claim 5 can reduce the size of the two-phase motor.

[0016] In the stator involved in technical solution 6, the coil is an open winding, one pole of one phase is composed of n (n: an even number) slots, the number of phases is m (m: 2 or 3), and the slot where the end portion of the winding of the first phase is inserted and the slot where the end portion of the winding of the second phase different from the first phase is inserted are separated by n×2 slots or more.

[0017] Thus, the stator according to claim 6 can reduce the number of portions where busbars, used to lead the wound ends of the coils from the stator core, overlap in a complex manner in the direction of the rotor's rotation axis. Therefore, the stator according to claim 6 can easily reduce the size of the two-phase motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram showing an example of a coil winding method and a busbar-based joining method according to the first embodiment.

[0019] Figure 2 It is a diagram showing an example of a coil winding method and a busbar-based joining method according to the second embodiment.

[0020] Figure 3 It is a diagram showing an example of the arrangement of terminals according to the third embodiment.

[0021] Figure 4This is a diagram showing an example of the positional relationship between a slot into which an end portion of a first phase winding starts is inserted and a slot into which an end portion of a second phase winding starts is inserted according to the fourth embodiment. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present invention with reference to the accompanying drawings. In the first to fourth embodiments, a two-phase electric motor is described as an example of a rotating electrical machine according to the present invention. This electric motor is mounted on an electric vehicle, for example, to rotate the tires of the vehicle.

[0023] (First embodiment) The two-phase electric motor according to the first embodiment includes a stator and a rotor. The stator includes a stator core and a coil.

[0024] The stator core is a cylindrical component with multiple teeth and slots formed inside. A tooth is the portion of the stator core that extends toward the rotor's rotational axis A. The shape and dimensions of a cross section taken along any plane perpendicular to the rotational axis A remain constant regardless of the position of the intersection of the rotational axis A and the plane. A slot is the space between two adjacent teeth circumferentially around a circle centered on a point on the rotational axis A and located on any plane perpendicular to the rotational axis A.

[0025] The coil is the wire wound around the teeth. Specifically, the coil is constructed by repeatedly inserting the ends of a U-shaped rectangular wire into two slots and electrically connecting them to the ends of another U-shaped rectangular wire, winding them around the entire stator core. The coil is an open-ended winding with both ends attached to an inverter circuit. When energized by this inverter circuit, it generates a magnetic force that rotates the rotor about the rotation axis A.

[0026] Figure 1 It is a diagram showing an example of a coil winding method and a busbar-based joining method according to the first embodiment. Figure 1 This shows an example of a case where one pole of one phase is composed of an even number n=4 slots and the number of phases is m=2. Therefore, the two-phase motor according to the first embodiment has a configuration α Phase coil α 1 and coil α 2 and composition β Phase coil β 1 and coil β 2. It should be explained that Figure 1 Mainly shows the coil α 1 and an example of a busbar-based joining method.

[0027] Figure 1 Each square in the first row from the top of represents the slot number assigned to each slot formed in the stator core. Figure 1As shown in the first row from the top, 64 slots are formed in the stator core. Figure 1 The squares in the second to ninth rows from the top indicate 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 wires forming the coils of each phase pass.

[0028] The slightly shaded squares represent the insertions that form the coils. α The position of the flat wire of 1. The squares with vertical line shading indicate the insertion of the coil. α The position of the flat wire 2. The squares with dark diagonal shading indicate the insertion of the coil. β The position of the flat wire of 1. The squares with light diagonal shading indicate the insertion of the coil. β 2. The position of the flat wire.

[0029] Figure 1 The second, third, ..., and ninth rows from the top represent the first, second, ..., and eighth turns, respectively, from the outer diameter side toward the inner diameter side of the stator core. The term "turn" as used herein refers to 64 squares located a certain distance from the outer diameter side of the stator core in the radial direction of a circle on a plane perpendicular to the rotation axis A, centered at a point on the rotation axis A.

[0030] Figure 1 The solid line shows the bending portion of the U-shaped flat wire. Figure 1 The inner side of the paper protrudes toward the front. Figure 1 The dotted line shows the end of the U-shaped flat wire Figure 1 The front of the paper protrudes toward the inside. Figure 1 The dashed-dotted lines shown indicate bus bars that electrically connect the ends of the U-shaped rectangular wires. Figure 1 The white circles shown indicate portions that are welded to electrically connect the ends of the U-shaped rectangular wires to each other.

[0031] Reference Figure 1 , for coil α 1. Winding method and connection based on busbar, coil α 2. Coil β 1 and coil β 2. A specific example of the start of winding and the end of winding will be described.

[0032] like Figure 1 As shown, the coil α 1. The end of the winding start α 1in is electrically joined to the end of the rectangular wire inserted into the first turn of the outermost turn of slot number 48 near the position of the first turn of slot number 44 with light diagonal hatching.

[0033] Coilα 1 has a flat wire, the flat wire Figure 1 The end portion configured on the right side is inserted into the position number 1 of the first turn, Figure 1 The end portion on the left side is inserted into the position number 2 of the second turn. α 1 has a flat wire, the flat wire Figure 1 The end portion arranged on the right side is inserted into the position number 3 of the first turn and electrically connected to the end portion of the flat wire inserted into the position number 2. Figure 1 The end portion arranged on the left side is inserted into the position number 4 of the second turn.

[0034] Coil α 1 has a flat wire, the flat wire Figure 1 The end portion arranged on the right side is inserted into the position number 5 of the first turn and electrically connected to the end portion of the flat wire inserted into the position number 4. Figure 1 The end portion on the left side is inserted into the position number 6 of the second turn. α 1 has a flat wire, the flat wire Figure 1 The end portion arranged on the right side is inserted into the position number 7 of the first turn and electrically connected to the end portion of the flat wire inserted into the position number 6. Figure 1 The end portion arranged on the left side is inserted into the position number 8 of the second turn.

[0035] Coil α 1 The four rectangular wires are wound around the first and second turns of the stator core. α 1 is wound from the third turn to the eighth turn of the stator core by the same structure as above. α From the winding start position of 1 to position number 64, Figure 1 The direction from the right to the left is the winding direction. α From the winding start position of 1 to position number 64, Figure 1 The direction from the left side to the right side becomes the opposite direction to the winding direction.

[0036] Coil α 1 has a busbar that electrically connects the last wire wound to the innermost diameter of the slot with the wire inserted into the slot that is shifted (n-1)×m-1 in the direction opposite to the winding direction from the slot where the wire is inserted. Specifically, the coil α 1 includes a bus bar that electrically connects the end of the rectangular wire inserted at position number 64 to the end of the rectangular wire inserted at position number 65 shifted rightward by (4-1)×2-1=5 slots from the slot into which the end is inserted.

[0037] The busbar is electrically connected to the end of the flat wire inserted at position 64 near the eighth turn of slot number 44. In addition, the busbar is electrically connected to the end of the flat wire inserted at position 65 near the eighth turn of slot number 39. Figure 1 Indicated by a single dot-dashed line.

[0038] Coil α 1 has a flat wire, the flat wire Figure 1 The end portion on the left side is inserted into the position number 65 of the eighth turn. Figure 1 The end portion arranged on the right side is inserted into the position number 66 of the seventh turn. α 1 has a flat wire, the flat wire Figure 1 The end portion arranged on the left side is inserted into the position number 67 of the eighth turn and electrically connected to the end portion of the flat wire inserted into the position number 66. Figure 1 The end portion arranged on the right side is inserted into the position numbered 68 of the seventh turn.

[0039] Coil α 1 has a flat wire, the flat wire Figure 1 The end portion arranged on the left side is inserted into the position number 69 of the eighth turn and electrically connected to the end portion of the flat wire inserted into the position number 68. Figure 1 The end portion arranged on the right side is inserted into the position number 70 of the seventh turn. α 1 has a flat wire, the flat wire Figure 1 The end portion arranged on the left side is inserted into the position number 71 of the eighth turn and electrically connected to the end portion of the flat wire inserted into the position number 70. Figure 1 The end portion arranged on the right side is inserted into the position number 72 of the seventh turn.

[0040] Coil α 1 is wound around the eighth and seventh turns of the stator core through the four rectangular wires mentioned above. α 1 is wound from the sixth turn to the first turn of the stator core by the same structure as above. α 1. The winding end position, Figure 1 The direction from the left to the right is the winding direction. α 1. The winding end position, Figure 1 The direction from the right side to the left side becomes the opposite direction to the winding direction.

[0041] like Figure 1 As shown, the coil α 1. The end of the winding end α 1out 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 with dark hatching.

[0042] like Figure 1 As shown, the coil α 2. The end where the winding starts α 2in is electrically joined 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 the dark shaded slot number 31.

[0043] Coil α 2 First, with the coil α 1The same winding method from Figure 1 The right side of the coil is wound to the left side until the end of the turn at the innermost diameter of the slot. α 2 through the coil α 1The same busbar will be wound in the direction of Figure 1 The left side of the coil is reversed to the right side. Then, the coil α 2 with coil α 1The same winding method from Figure 1 The left side of the groove is wound in a rightward direction to the end of the turn at the outermost diameter of the groove.

[0044] like Figure 1 As shown, the coil α 2. The end of the winding end α 2out 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 with dark hatching.

[0045] like Figure 1 As shown, the coil β 1. The end of the winding start β 1in 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 shaded by vertical lines.

[0046] Coil β 1First, with the coil α 1The same winding method from Figure 1 The right side of the coil is wound to the left side until the end of the turn at the innermost diameter of the slot. β 1Through the coil α 1The same busbar will be wound in the direction of Figure 1 The left side of the coil is reversed to the right side. Then, the coil β 1 with coil α 1The same winding method from Figure 1 The left side of the groove is wound in a rightward direction to the end of the turn at the outermost diameter of the groove.

[0047] like Figure 1 As shown, the coil β 1. The end of the winding end β 1out 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 shaded by vertical lines.

[0048] like Figure 1 As shown, the coil β 2. The end where the winding starts β 2in is electrically joined 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 with light shaded lines.

[0049] Coil β 2 First, with the coil β 1The same winding method from Figure 1 The right side of the coil is wound to the left side until the end of the turn at the innermost diameter of the slot. β 2 through the coil β 1The same busbar will be wound in the direction of Figure 1 The left side of the coil is reversed to the right side. Then, the coil β 2 with coil β 1The same winding method from Figure 1 The left side of the groove is wound in a rightward direction to the end of the turn at the outermost diameter of the groove.

[0050] like Figure 1 As shown, the coil β 2. The end of the winding end β 2out 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 with light shaded lines.

[0051] The two-phase motor according to the first embodiment has been described above. The two-phase motor according to the first embodiment includes a coil as an open winding. α 1. Coil α 2. Coil β 1 and coil β 2. One pole per phase consists of an even number n = 4 slots, with the number of phases being m = 2. The ends of these four coils where winding begins are electrically bonded to the wire inserted into the outermost turn of the slot, and the ends where winding ends are electrically bonded to the wire inserted into the outermost turn of the slot. Furthermore, these four coils include a busbar that electrically bonds the last wire wound to the innermost turn of the slot to the wire inserted into a slot within the innermost turn of the slot, offset five slots in the opposite direction of the winding direction from the slot where the wire was inserted.

[0052] Thus, the two-phase motor involved in the first embodiment can shorten the busbar used to lead the ends of the winding of the above-mentioned four coils out from the outermost diameter of the stator core. Therefore, the two-phase motor involved in the first embodiment can suppress the stress generated by vibration, etc. and amplified according to the lever principle and applied to the busbar. In addition, the two-phase motor involved in the first embodiment can reduce the amount of material required to make the busbar, and can improve the yield rate of the busbar. Furthermore, the two-phase motor involved in the first embodiment can set the busbar as a simple and short busbar, and can easily miniaturize the two-phase motor.

[0053] In the first embodiment, the coil is described as an example. α 1. The busbar includes a case where the last wire wound to the innermost diameter of the slot is electrically connected to the wire inserted into the slot that is shifted (n-1)×m-1 in the direction opposite to the winding direction from the slot where the wire is inserted in the innermost diameter of the slot, but is not limited to this. That is, the coil α Depending on the winding method, a busbar may be provided that electrically connects the last wire wound to the turn with the innermost diameter of the slot with the wire inserted into a slot shifted in the winding direction by (n-1)×m-1 from the slot in which the wire was inserted, among the turns with the innermost diameter of the slot.

[0054] (Second embodiment) The two-phase electric motor according to the second embodiment includes a stator core different from that of the first embodiment and a coil wound in a different manner from that of the first embodiment. Therefore, the description of the second embodiment will focus on the differences from the above-mentioned embodiment, and descriptions of the contents overlapping with the above-mentioned embodiment will be omitted as appropriate.

[0055] The stator core is formed with a plurality of slots capable of winding a wire for p turns (p is an even number equal to or greater than 6). For example, in the second embodiment, the stator core is formed with a plurality of slots capable of winding a wire for p=8 turns.

[0056] Figure 2 It is a diagram showing an example of a coil winding method and a busbar-based joining method according to the second embodiment. Figure 2 This shows an example of a case where one pole of one phase is composed of an even number n=4 slots and the number of phases is m=2. Therefore, the two-phase motor according to the second embodiment has a configuration α Phase coil α 1 and coil α 2 and composition β Phase coil β 1 and coil β 2. It should be explained that Figure 2 Mainly shows the coil α1 and an example of a busbar-based winding method. Figure 2 The expression method used in Figure 1 The expression method used in is the same.

[0057] Reference Figure 2 , for coil α 1. Winding method and connection based on busbar, coil α 2. Coil β 1 and coil β 2. A specific example of the start of winding and the end of winding will be described.

[0058] like Figure 2 As shown, the coil α 1. The end of the winding start α 1in is electrically joined 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 with light shaded lines.

[0059] Coil α 1 has a flat wire, the flat wire Figure 2 The end portion configured on the right side is inserted into the position number 1 of the first turn, Figure 2 The end portion on the left side is inserted into the position number 2 of the second turn. α 1 has a flat wire, the flat wire Figure 2 The end portion arranged on the right side is inserted into the position number 3 of the first turn and electrically connected to the end portion of the flat wire inserted into the position number 2. Figure 2 The end portion arranged on the left side is inserted into the position number 4 of the second turn.

[0060] Coil α 1 has a flat wire, the flat wire Figure 2 The end portion arranged on the right side is inserted into the position number 5 of the first turn and electrically connected to the end portion of the flat wire inserted into the position number 4. Figure 2 The end portion on the left side is inserted into the position number 6 of the second turn. α 1 has a flat wire, the flat wire Figure 2 The end portion arranged on the right side is inserted into the position number 7 of the first turn and electrically connected to the end portion of the flat wire inserted into the position number 6. Figure 2 The end portion arranged on the left side is inserted into the position number 8 of the second turn.

[0061] Coil α 1 The four rectangular wires are wound around the first and second turns of the stator core. α1 is wound from the third turn to the eighth turn of the stator core by the same structure as above. α 1 between the start and end of winding. Figure 2 The direction from the right to the left is the winding direction. α 1 between the start and end of winding. Figure 2 The direction from the left side to the right side becomes the opposite direction to the winding direction.

[0062] Coil α 1 has a busbar that is electrically connected to a wire inserted into a slot that is offset by n×2+1 turns in the winding direction and then wound from the outer diameter side of the slot to the pth turn. α 1 When winding from the outer diameter side of the slot to the eighth turn and then folding back to the outer diameter side of the slot, it is electrically connected to the wire inserted into the outer diameter side of the slot that is staggered by n×2+1=4×2+1=9 turns in the winding direction. Figure 2 As shown by the dot-dash line, the connection is achieved through three busbars.

[0063] The first busbar will be Figure 2 The end of the flat wire arranged on the left side and inserted into the position number 64 of the slot number 40 is connected to the second busbar at Figure 2 The second busbar connects the first busbar to the right end of the Figure 2 The left end of the busbar is connected to the third busbar. Figure 2 The third busbar connects the second busbar to the right end of the Figure 2 The end portion on the left side is located in the Figure 2 The end of the rectangular wire arranged on the right side and inserted into the position number 65 of the slot number 49 is electrically connected. α 1Wrap one circle around the stator core.

[0064] Coil α 1 has a busbar electrically connected to the wire on the outer diameter side of three turns inserted into slots shifted by n×2+2 in the winding direction. α 1 is electrically connected to the wire on the outer diameter side of 3 turns inserted into the slots staggered by n×2+2=4×2+2=10 in the winding direction. Figure 2 As shown by the dot-dash line, the connection is achieved through three busbars.

[0065] The first busbar will be Figure 2The end of the flat wire arranged on the left side and inserted into the position number 80 of the slot number 41 is electrically connected to the end near the eighth turn of the second busbar arranged in the slot number 45. The second busbar connects the first busbar at Figure 2 The left end of the busbar is connected to the third busbar. Figure 2 The third busbar connects the end portion of the second busbar located in the slot number 47 near the fifth turn to the end portion of the second busbar located in the slot number 47. Figure 2 The end portion of the rectangular wire arranged on the right side and inserted into the position number 81 of the slot number 51 is electrically connected.

[0066] Coil α 1 also includes a busbar electrically connected to the wire on the outer diameter side of the three turns inserted into the slots shifted by n×2-2 in the winding direction. α 1 is electrically connected to the wire on the outer diameter side of 3 turns inserted into the slots staggered n×2-2=4×2-2=6 in the winding direction. Figure 2 As shown by the dot-dash line, the connection is achieved through three busbars.

[0067] The first busbar will be Figure 2 The end of the flat wire arranged on the left side and inserted into the position number 96 of the slot number 43 is electrically connected to the end near the sixth turn of the slot number 47 in the second busbar. The second busbar connects the first busbar at Figure 2 The end portion of the third busbar disposed on the left side is electrically connected to the end portion of the third busbar disposed in the slot number 45 near the third turn. The third busbar electrically connects the end portion of the second busbar disposed in the slot number 45 near the third turn to the end portion of the third busbar disposed in the slot number 45. Figure 2 The end of the rectangular wire arranged on the right side and inserted into the position number 97 of the slot number 49 is electrically connected. α 1Wrap one circle around the stator core.

[0068] Coil α 1 has a busbar electrically connected to the wire on the outer diameter side of three turns inserted into slots shifted by n×2+2 in the winding direction. α 1 is electrically connected to the wire on the outer diameter side of 3 turns inserted into the slots staggered by n×2+2=4×2+2=10 in the winding direction. Figure 2 As shown by the dot-dash line, the connection is achieved through three busbars.

[0069] The first busbar will be Figure 2 The end of the flat wire arranged on the left side and inserted into the position number 112 of the slot number 41 is electrically connected to the end near the fourth turn of the second busbar arranged in the slot number 45. The second busbar connects the first busbar at Figure 2 The end portion of the third busbar disposed on the left side is electrically connected to the end portion of the third busbar disposed near the fourth turn of the slot number 45. The third busbar electrically connects the end portion of the second busbar disposed near the first turn of the slot number 47 to the end portion of the third busbar disposed near the first turn of the slot number 47. Figure 2 The end portion of the rectangular wire arranged on the right side and inserted into the position number 113 of the slot number 51 is electrically connected.

[0070] Coil α The above structure is repeated until the second turn is wound from the outer diameter side of the stator core.

[0071] like Figure 2 As shown, the coil α 1. The end of the winding end α 1out is electrically connected to the end of the rectangular wire inserted from the outer diameter side of slot number 43 to the second turn near the position of the second turn of slot number 47 with dark shaded lines.

[0072] like Figure 2 As shown, the coil α 2. The end where the winding starts α 2in is electrically connected to the end of the rectangular wire inserted into the second turn of slot number 35 near the position of the second turn of slot number 39 with light shaded lines. α 2With coil α 1The same busbar, through the coil α 1 is wound on the stator core in the same winding method. Figure 2 As shown, the coil α 2. The end of the winding end α 2out 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 with dark hatching.

[0073] like Figure 2 As shown, the coil β 1. The end of the winding start β 1in is electrically connected to the end of the rectangular wire inserted into the first turn, the outermost turn, of slot number 12, near the position of the first turn of slot number 8 shaded by vertical lines. β 1With coil α 1The same busbar, through the coil α 1 is wound on the stator core in the same winding method. Figure 2 As shown, the coil β 1. The end of the winding end β 1out is electrically connected to the end of the rectangular wire inserted into the second turn of slot number 7 near the position of the second turn of slot number 11 (with dotted hatching).

[0074] like Figure 2As shown, the coil β 2. The end where the winding starts β 2in is electrically connected to the end of the rectangular wire inserted into the second turn of slot number 63 near the position of the second turn of slot number 3 shaded by vertical lines. β 2With coil α 1The same busbar, through the coil α 1 is wound on the stator core in the same winding method. Figure 2 As shown, the coil β 2. The end of the winding end β 2out is electrically connected to the end of the rectangular wire inserted into the first turn, which is the outermost turn of slot number 4, near the position of the first turn of the dotted-hatched slot number 64.

[0075] The two-phase motor according to the second embodiment has been described above. The two-phase motor according to the second embodiment includes a stator core having a plurality of slots formed therein, each of which is capable of winding a wire for p turns (p is an even number equal to or greater than 6).

[0076] In addition, the two-phase motor according to the second embodiment includes a coil as an open winding. α 1. Coil α 2. Coil β 1 and coil β 2. One pole per phase consists of an even number n = 4 slots, and the number of phases is m = 2. The ends of these four coils where winding begins are electrically connected to the wire inserted from the outer diameter side of the slot for the first turn, and the ends where winding ends are electrically connected to the wire inserted from the outer diameter side of the slot for the second turn.

[0077] Furthermore, when these four coils are wound from the outer diameter side of the slots to the eighth turn and then folded back toward the outer diameter side of the slots, they are electrically bonded to the wire inserted into the outer diameter side of the slots, which are offset by 4×2+1=9 turns in the winding direction. Furthermore, after these four coils are wound around the stator core once, they are electrically bonded to the wire inserted into the outer diameter side of the slots, which are offset by 4×2+2=10 turns in the winding direction.

[0078] Therefore, the two-phase motor according to the second embodiment can achieve the same effects as those of the two-phase motor according to the first embodiment.

[0079] Furthermore, if the stator core has multiple slots capable of receiving p (p: an even number of 6 or greater) turns of wire, these four coils are wound as follows. These four coils are also electrically bonded to the wire inserted into slots offset by n×2-2 turns in the winding direction, three turns on the outer diameter side. Furthermore, after these four coils have been wound around the stator core once, they are electrically bonded to the wire inserted into slots offset by 4×2+2=10 turns in the winding direction, three turns on the outer diameter side. This structure is repeated until these four coils are wound from the outer diameter side of the stator core to the second turn.

[0080] Therefore, 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 when the stator core has a plurality of slots capable of winding a wire for p (p: an even number of 6 or more) turns.

[0081] In the second embodiment, the example described is that the stator core includes a plurality of slots capable of winding a wire for p turns (p is an even number, 6 or greater), but the present invention is not limited thereto. The stator core according to the second embodiment may also include a plurality of slots capable of winding a wire for p turns (p is an even number). Therefore, the stator core according to the second embodiment may also include a plurality of slots capable of winding a wire for two or four turns.

[0082] (Third embodiment) The two-phase motor involved in the third embodiment has the same stator core as the first embodiment or the second embodiment and the coils with the same winding method as the first embodiment or the second embodiment. However, the two-phase motor involved in the third embodiment has terminals configured in a manner different from the above-mentioned embodiments. Therefore, in the description of the third embodiment, the content that differs from the above-mentioned embodiments is mainly described, and the description related to the content that overlaps with the above-mentioned embodiments is appropriately omitted.

[0083] Figure 3 : is a diagram showing an example of the arrangement of terminals according to the third embodiment. Figure 3 As shown, the two-phase motor according to the third embodiment includes a stator core 10, terminals 31, 32, ..., and 38, and busbars 41, 42, ..., and 48. 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 coils are open-ended windings, with one pole per phase consisting of n (n: an even number) slots, and the number of phases m = 2.

[0084] The terminal 31 , the terminal 32 , . . . , and the terminal 38 are examples of m×u×2=2×2×2=8 terminals assembled in a u=2 parallel circuit.

[0085] Terminal 31 is the coil α 1 part, through busbar 41 and coil α 1. The end of the winding start α 1in electrical connection. Terminal 32 is the coil α 1 part, through busbar 42 and coil α 1. The end of the winding end α 1out is electrically connected. Terminal 33 is the coil α 2 part, through busbar 43 and coilα 2. The end where the winding starts α 2in electrical connection. Terminal 34 is the coil α 2 part, through busbar 44 and coil α 2. The end of the winding end α 2out electrical connection.

[0086] Terminal 35 is the coil β 1 part, through busbar 45 and coil β 1. The end of the winding start β 1in electrical connection. Terminal 36 is the coil β 1 part, through busbar 46 and coil β 1. The end of the winding end β 1out electrical connection. Terminal 37 is the coil β 2 part, through busbar 47 and coil β 2. Start winding the end β 2in electrical connection. Terminal 38 is the coil β 2 part, through busbar 48 and coil β 2. The end of the winding end β 2out electrical connection.

[0087] Furthermore, the terminals 31, 32, ..., and 38 are arranged so as to be staggered with respect to the direction of the rotor's rotation axis A. Specifically, the terminals 31, 32, ..., and 38 are arranged so as to be staggered with respect to the direction of the rotor's rotation axis A. Figure 3 The positions of adjacent terminals in the left-right direction in the direction of the rotation axis A are different. For example, the position of terminal 31 in the direction of the rotation axis A is different from that of terminal 32. Also, for example, the position of terminal 35 in the direction of the rotation axis A is different from that of terminals 34 and 36. This also applies to terminals other than terminals 31 and 35.

[0088] like Figure 3 As shown, the busbar 41 extends from the portion where it overlaps with the back yoke of the stator core in the direction of the rotation axis A to the end where the winding begins. α The back yoke is laid to within 1 inch in the area overlapping with the back yoke in the direction of the rotation axis A. The back yoke is a portion of the stator core that is farther from the rotation axis A than the portion where the slots are formed. The portion where the back yoke of the stator core begins to overlap with the busbar 41 in the direction of the rotation axis A is the portion where the back yoke and the busbar 41 first overlap in the direction of the rotation axis A when moving along the busbar 41 from the terminal 31 toward the slot.

[0089] Likewise, if Figure 3 As shown, the busbar 42 extends from the portion where it begins to overlap with the back yoke of the stator core in the direction of the rotation axis A to the end where the winding ends. α1out is laid in the area overlapping with the back yoke in the direction of the rotation axis A. In addition, the portion where the back yoke of the stator core and the busbar 42 begin to overlap in the direction of the rotation axis A refers to the portion where the back yoke and the busbar 42 first overlap in the direction of the rotation axis A when going along the busbar 42 from the terminal 32 toward the slot.

[0090] The positional relationship between the bus bar 41 or the bus bar 42 and the back yoke described above is also the same for the bus bar 43 , the bus bar 44 , . . . , and the bus bar 48 .

[0091] The two-phase motor according to the third embodiment has been described above. The two-phase motor according to the third embodiment includes a coil having m×u×2=2×2×2=8 terminals assembled in a u=2 parallel circuit and arranged staggered in the direction of the rotor's rotation axis.

[0092] Therefore, the two-phase motor involved in the third embodiment can ensure the insulation distance between the busbar and the terminal, the insulation distance between the busbars, and the insulation distance between the terminals even when the end of the coil winding is led out to the outside of the stator core by a simple and short busbar.

[0093] The two-phase motor according to the third embodiment includes busbars 41, 42, ..., and 48. These eight busbars are laid in an area overlapping the back yoke in the direction of the rotation axis A, from the portion where the back yoke begins to overlap in the direction of the rotation axis A to the end where winding begins or the end where winding ends.

[0094] As a result, the two-phase motor according to the third embodiment can be reduced in size.

[0095] (Fourth embodiment) The two-phase motor according to the fourth embodiment includes the same stator core as the first or second embodiment and the same coil winding method as the first or second embodiment. However, the positional relationship between the slot where the winding end of the first phase is inserted and the slot where the winding end of the second phase, which is different from the first phase, is inserted is different from that of the above-mentioned embodiments. Therefore, in the description of the fourth embodiment, the content that differs from the above-mentioned embodiments will be mainly described, and the description of the content that overlaps with the above-mentioned embodiments will be appropriately omitted.

[0096] Figure 4 : is a diagram showing an example of the positional relationship between the slot into which the end portion of the winding start of the first phase is inserted and the slot into which the end portion of the winding start of the second phase is inserted according to the fourth embodiment. Figure 4As shown, the two-phase motor according to the fourth embodiment includes a stator core 10, slots S1, and slots 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-circuit winding, and the number of phases, m = 2, is formed by n (n: an even number) slots.

[0097] The end portion where the winding of the first phase starts is inserted into the slot S1. Specifically, the slot S1 is inserted into α Phase coil α 1. The end of the winding start α 1in. The end portion of the winding start of the second phase different from the first phase is inserted into the slot S5. Specifically, the end portion of the winding start of the second phase different from the first phase is inserted into the slot S5. β Phase coil β 1. The end of the winding start β 1in. In addition, Figure 4 As shown, the slots S1 and S5 are separated by n×2=4×2=8 slots or more.

[0098] The two-phase motor according to the fourth embodiment has been described above. α Phase coil α 1. The end of the winding start α 1in slot S1 and insert there β Phase coil β 1. The end of the winding start β The coil is arranged by separating the 1-inch slot S5 into n×2=4×2=8 or more slots.

[0099] Thus, the two-phase motor according to the fourth embodiment can reduce the number of portions where busbars for leading the wound ends of the coils out of the stator core overlap in the direction of the rotation axis A. Therefore, the two-phase motor according to the fourth embodiment can be easily miniaturized.

[0100] It should be noted that, in the above-described embodiment, the rotating electrical machine according to the embodiment is described as a two-phase motor, that is, the number of phases m is 2. However, the present invention is not limited to this. For example, the rotating electrical machine according to the embodiment may also be a three-phase motor. In other words, the number of phases m of the rotating electrical machine according to the embodiment may also be 3.

[0101] In addition, in the above embodiments, the rotating electrical machine according to the embodiments is described as an example of an electric motor, but the present invention is not limited thereto. The rotating electrical machine according to the embodiments may be a generator that converts mechanical energy into electrical energy instead of a motor that converts electrical energy into mechanical energy.

[0102] The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. That is, the present invention includes embodiments in which various modifications, replacements, and design changes are implemented based on the main principles of the present invention, and these embodiments are not excluded.

[0103] Label Description 10… stator core 31, 32, 33, 34, 35, 36, 37, 38... terminals A…Rotation axis S1, S5…slots.

Claims

1. A stator comprising: a stator core formed with a plurality of slots; and A coil, which is an open winding, wherein one pole of one phase is composed of n slots, the number of phases is m, the end portion where winding begins is electrically connected to the wire of the turn with the outermost diameter inserted into the slot, the end portion where winding ends is electrically connected to the wire of the turn with the outermost diameter inserted into the slot, and the last wire wound to the turn with the innermost diameter of the slot is electrically connected to the wire inserted into a slot that is offset from the slot where the wire is inserted in the winding direction or in the direction opposite to the winding direction by (n-1)×m-1 in the turn with the innermost diameter of the slot, where n is an even number and m is 2 or 3.

2. A stator comprising: a stator core having a plurality of slots formed therein capable of winding a wire p turns, where p is an even number; and A coil, wherein one pole of one phase is composed of n slots, an end portion where winding starts is electrically connected to a wire inserted into the first turn from the outer diameter side of the slot, and an end portion where winding ends is electrically connected to a wire inserted into the second turn from the outer diameter side of the slot. When the coil is wound from the outer diameter side of the slot to the pth turn and then folded back toward the outer diameter side of the slot, the coil is electrically connected to a wire inserted into the outer diameter side of one turn that is offset by n×2+1 slots in the winding direction. The coil is wound once around the stator core and is electrically connected to a wire inserted into the outer diameter side of three turns that are offset by n×2+2 slots in the winding direction, where n is an even number.

3. The stator according to claim 2, wherein: The stator core is formed with a plurality of slots capable of winding a wire p turns, where p is an even number greater than 6. The coil is also electrically connected to the wire on the outer diameter side of 3 turns inserted into the slots offset by n×2-2 in the winding direction, and is wound around the stator core for one turn. It is then electrically connected to the wire on the outer diameter side of 3 turns inserted into the slots offset by n×2+2 in the winding direction. By repeating the above structure, the coil is wound from the outer diameter side of the stator core to the second turn.

4. The stator according to any one of claims 1 to 3, wherein: The coil is an open winding, one pole of one phase is composed of n slots, the number of phases is m, and the m×u×2 terminals assembled in the u-parallel circuit are arranged staggered in the direction of the rotor's rotation axis, n is an even number, and m is 2 or 3.

5. The stator according to any one of claims 1 to 3, wherein: The coil has a busbar, which electrically connects the terminal of the u-parallel circuit assembled with the end where the winding starts or the end where the winding ends. The busbar is laid in the area overlapping with the back yoke in the direction of the rotating axis of the rotor, from the part where the back yoke of the stator core starts to overlap in the direction of the rotating axis to the end where the winding starts or the end where the winding ends.

6. The stator according to any one of claims 1 to 3, wherein: The coil is an open winding, one pole of one phase is composed of n slots, the number of phases is m, the slot where the end portion of the winding of the first phase is inserted and the slot where the end portion of the winding of the second phase different from the first phase is inserted are separated by n×2 slots or more, n is an even number, and m is 2 or 3.

Images