Rotating electrical machine

Abstract

Provided is a rotating electric machine capable of high-speed rotation. An electric motor (1) includes a stator (4) and a rotor (3) capable of relative rotation with respect to the stator (4). The stator (4) includes a stator core (10) including a yoke portion (12) in a cylindrical shape and 12 teeth (16) protruding toward the inner side in the radial direction from the yoke portion (12), and three-phase coils (20) obtained by winding a winding around the teeth (16) in a concentrated winding manner. The rotor (3) has a pole number of 2 poles. The teeth (16) have two teeth (16) adjacent in the circumferential direction as tooth portions (171 to 176), and windings of the same phase are connected in series with respect to the two teeth (16) constituting the tooth portions (171 to 176) and wound in the same direction. The teeth (16) are arranged in a manner in which adjacent tooth portions (171 to 176) are of different phases and each phase of the three phases is arranged in order in the circumferential direction.

Description

Technical Field

[0001] This disclosure relates to rotating electrical machines. Background Technology

[0002] Japanese Patent Application Publication No. 2006-296146 discloses a stator for an electric motor in which the teeth are arranged in a ring shape, a resin bobbin is mounted on the teeth, and a winding is concentrated on the resin bobbin. The starting wire for winding is wound around the side of the teeth in the slots of the resin bobbin mounted on the teeth, and after the final turn of the teeth is wound, the winding is led to the adjacent teeth using a connecting wire. Summary of the Invention

[0003] In electric motors requiring high-speed rotation, from a control perspective, the two poles with the smallest number of poles are preferred. In the electric motors described in the aforementioned literature, because the winding direction of the windings is reversed on adjacent teeth, the number of poles must be increased, making it difficult to cope with high-speed rotation.

[0004] In this disclosure, a rotary electric motor capable of high-speed rotation is proposed.

[0005] The inventors have conducted in-depth research on high-speed rotating motors and proposed the following structure to realize a simple and compact 2-pole 12-slot rotating motor.

[0006] According to this disclosure, a rotary electric motor is proposed, comprising a stator and a rotor capable of rotating relative to the stator. The stator includes a stator core and three-phase coils. The stator core includes a cylindrical yoke and 12 teeth protruding radially inward from the yoke. The three-phase coils are obtained by winding the windings around the teeth in a concentrated manner. The rotor has two poles. The teeth are arranged such that adjacent teeth in the circumferential direction form tooth sections, and windings of the same phase are connected in series with respect to the two teeth forming the tooth sections and wound in the same direction. The teeth are arranged such that adjacent tooth sections are of different phases and the three phases are arranged sequentially in the circumferential direction.

[0007] This allows for the creation of a simple and compact rotary motor with a 2-pole, 12-slot structure. Because it has only 2 poles, the rotary motor can rotate at high speeds.

[0008] The above and other objects, features, aspects and advantages of the present invention will become clear from the following detailed description in relation to the invention, which is understood in conjunction with the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a partial cross-sectional view showing the schematic structure of an electric compressor equipped with a rotary motor according to the embodiment.

[0010] Figure 2 It is a top-down view of the stator core.

[0011] Figure 3 This is a top-down view of an electric motor.

[0012] Figure 4 This is a schematic diagram showing the winding wound around the teeth.

[0013] Figure 5 This is the wiring diagram for the stator.

[0014] Figure 6 It is a 3D diagram of a circular busbar.

[0015] Figure 7 It is a top-down view of the circular busbar.

[0016] Figure 8 This is a schematic diagram showing the resin covering the circular busbar.

[0017] Figure 9 This is another example of a stator wiring diagram. Detailed Implementation

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments, the same or substantially the same structures will be labeled with the same reference numerals and will not be described repeatedly.

[0019] Figure 1 This is a partial cross-sectional view showing the schematic structure of an electric compressor 110 equipped with a rotary motor according to the embodiment. As an example, the electric compressor 110 is a turbine air pump mounted in a fuel cell vehicle and driven by high-speed rotation.

[0020] like Figure 1 As shown, the electric compressor 110 includes a housing 112, a compression section 115, and an electric motor 1.

[0021] An electric motor 1, as an example of a rotary electric motor, includes a rotor (rotating component) 3 and a stator (fixed component) 4. The rotor 3 is fixed to a rotating shaft 2. The rotating shaft 2 is rotatably supported within a housing 112, passing through the stator 4. The stator 4 is configured to include a stator core 10 and a coil 20. The stator core 10 is fixed to the inner circumferential surface of the housing 112. The coil 20 is fitted onto the teeth of the stator core 10, which will be described later.

[0022] By supplying power to the electric motor 1, the rotor 3 and the rotating shaft 2 rotate relative to the stator 4 and the housing 112. This rotation drives the compressor 115. By driving the compressor 115, air is supplied to the fuel cell.

[0023] Figure 2 This is a top-down schematic diagram of the stator core 10. Figure 2The diagram shows the axial direction of electric motor 1 (in... Figure 1 The stator core 10 is shown in the figure from left to right (center). The stator core 10 can be formed by stacking multiple electromagnetic steel plates in a ring shape, or it can be formed by a single component made of magnetic material.

[0024] like Figure 2 As shown, the stator core 10 has a hollow cylindrical shape as a whole. In the following embodiments, the axial direction of the cylindrical stator core 10 will be simply referred to as the axial direction, the radial direction of the stator core 10 will be simply referred to as the radial direction, and the circumferential direction of the stator core 10 will be simply referred to as the circumferential direction, for the purpose of description.

[0025] The stator core 10 includes a cylindrical yoke 12 and a plurality of teeth 16. The teeth 16 protrude radially inward from the inner circumferential surface of the yoke 12. The teeth 16 are spaced apart circumferentially on the stator core 10. Between adjacent teeth 16, slots 18 extending axially are formed. In this embodiment, the stator core 10 has 12 teeth 16. The number of slots 18 is the same as the number of teeth 16, which is 12.

[0026] More specifically, the stator core 10 includes 12 teeth 1601 to 1612. A slot 1801 is formed between adjacent teeth 1601 and 1602 in the circumferential direction. A slot 1802 is formed between adjacent teeth 1602 and 1603 in the circumferential direction. A slot 1803 is formed between adjacent teeth 1603 and 1604 in the circumferential direction. A slot 1804 is formed between adjacent teeth 1604 and 1605 in the circumferential direction.

[0027] A groove 1805 is formed between adjacent teeth 1605 and 1606 in the circumferential direction. A groove 1806 is formed between adjacent teeth 1606 and 1607 in the circumferential direction. A groove 1807 is formed between adjacent teeth 1607 and 1608 in the circumferential direction. A groove 1808 is formed between adjacent teeth 1608 and 1609 in the circumferential direction.

[0028] A groove 1809 is formed between adjacent teeth 1609 and 1610 in the circumferential direction. A groove 1810 is formed between adjacent teeth 1610 and 1611 in the circumferential direction. A groove 1811 is formed between adjacent teeth 1611 and 1612 in the circumferential direction. A groove 1812 is formed between adjacent teeth 1612 and 1601 in the circumferential direction.

[0029] Two adjacent teeth 1601 and 1602 in the circumferential direction form tooth section 171. Two adjacent teeth 1603 and 1604 in the circumferential direction form tooth section 172. Two adjacent teeth 1605 and 1606 in the circumferential direction form tooth section 173. Two adjacent teeth 1607 and 1608 in the circumferential direction form tooth section 174. Two adjacent teeth 1609 and 1610 in the circumferential direction form tooth section 175. Two adjacent teeth 1611 and 1612 in the circumferential direction form tooth section 176.

[0030] Figure 3 This is a schematic diagram of the electric motor 1 viewed from above. A three-phase coil 20 is formed by winding a coil in a concentrated manner on each of the 12 teeth 16. The three-phase coil 20 includes: a U-phase coil formed by winding a U-phase winding around the teeth 16; a V-phase coil formed by winding a V-phase winding around the teeth 16; and a W-phase coil formed by winding a W-phase winding around the teeth 16. In this embodiment, the 12 coils are arranged circumferentially, and each phase coil consists of four coils 20.

[0031] Specifically, a U-phase coil 24Up1 is mounted on tooth 1601. A U-phase coil 24Up2 is mounted on tooth 1602. Teeth 1601 and 1602 constitute tooth 171. Figure 2 The winding of the U-phase is wound around the teeth 1601 and 1602 that constitute the tooth section 171, thereby forming the U-phase coil.

[0032] A V-phase coil 34Vm3 is mounted on tooth 1603. A V-phase coil 34Vm4 is mounted on tooth 1604. Teeth 1603 and 1604 constitute tooth section 172. Figure 2 The V-phase windings are wound around the teeth 1603 and 1604 that constitute the tooth section 172, thereby forming the V-phase coil.

[0033] A W-phase coil 44Wp5 is mounted on tooth 1605. A W-phase coil 44Wp6 is mounted on tooth 1606. Teeth 1605 and 1606 constitute tooth section 173. Figure 2 The winding of phase W is wound around teeth 1605 and 1606 that constitute tooth 173, thereby forming a coil of phase W.

[0034] A U-phase coil 24Um7 is mounted on tooth 1607. A U-phase coil 24Um8 is mounted on tooth 1608. Teeth 1607 and 1608 constitute tooth section 174. Figure 2 The winding of the U-phase is wound around the teeth 1607 and 1608 that constitute the tooth section 174, thereby forming the U-phase coil.

[0035] A V-phase coil 34Vp9 is mounted on tooth 1609. A V-phase coil 34Vp10 is mounted on tooth 1610. Teeth 1609 and 1610 constitute tooth section 175. Figure 2 The V-phase windings are wound around the teeth 1609 and 1610 that constitute the tooth section 175, thereby forming the V-phase coil.

[0036] A W-phase coil 44Wm11 is assembled in tooth 1611. A W-phase coil 44Wm12 is assembled in tooth 1612. Teeth 1611 and 1612 constitute tooth section 176. Figure 2 The winding of phase W is wound around the teeth 1611 and 1612 that constitute the tooth section 176, thereby forming the coil of phase W.

[0037] Two U-phase coils are formed by winding U-phase coils around two adjacent teeth 16. For example, U-phase coils 24Up1 and 24Up2 are assembled on adjacent teeth 1601 and 1602 constituting tooth 171. Two V-phase coils are formed by winding V-phase coils around two teeth 16 adjacent to the two teeth 16 where the U-phase coils are assembled. For example, V-phase coils 34Vm3 and 34Vm4 are assembled on teeth 1603 and 1604 constituting tooth 172 adjacent to tooth 171.

[0038] The winding of phase W is wound on adjacent teeth 16 on the opposite side of the winding of phase V relative to the winding of phase U, thereby forming the coil of phase W. For example, the coils of phase W 44Wm11 and 44Wm12 are assembled on teeth 1611 and 1612 constituting tooth 176 on the opposite side of tooth 171 and tooth 172 on which the coil of phase V is assembled.

[0039] The teeth 16 are arranged such that adjacent teeth are of different phases and the three phases are arranged sequentially in the circumferential direction. The three-phase coils are arranged relative to the six circumferentially arranged teeth 171-176 in the order of the first phase coil, the second phase coil, and the third phase coil. A U-phase coil is mounted in tooth 171. A V-phase coil is mounted in tooth 172 adjacent to tooth 171. A W-phase coil is mounted in tooth 173 adjacent to tooth 172. A U-phase coil is mounted in tooth 174 adjacent to tooth 173. A V-phase coil is mounted in tooth 175 adjacent to tooth 174. A W-phase coil is mounted in tooth 176 adjacent to tooth 175.

[0040] The U-phase coil 24Up1 and the W-phase coil 44Wm12 are adjacent in the circumferential direction. An interphase insulating paper 61 is disposed between the U-phase winding forming the U-phase coil 24Up1 and the W-phase winding forming the W-phase coil 44Wm12. The interphase insulating paper 61 is an example of an interphase insulator, insulating the U-phase winding forming the U-phase coil 24Up1 from the W-phase winding forming the W-phase coil 44Wm12.

[0041] Furthermore, interphase insulating paper 62 is disposed between the V-phase winding forming the V-phase coil 34Vm4 and the W-phase winding forming the W-phase coil 44Wp5. The interphase insulating paper 62 insulates the V-phase winding forming the V-phase coil 34Vm4 from the W-phase winding forming the W-phase coil 44Wp5. Interphase insulating paper 63 is disposed between the U-phase winding forming the U-phase coil 24Um8 and the V-phase winding forming the V-phase coil 34Vp9. The interphase insulating paper 63 insulates the U-phase winding forming the U-phase coil 24Um8 from the V-phase winding forming the V-phase coil 34Vp9.

[0042] like Figure 3 As shown, rotor 3 has an N-pole core 3N and an S-pole core 3S, and rotor 3 has 2 poles. Rotor 3 can be an IPM (Interior Permanent Magnet) type rotor in which permanent magnets are embedded in each core, or an SPM (Surface Permanent Magnet) type rotor in which magnets are pasted on the surface of each core.

[0043] Figure 4 This is a schematic diagram showing the winding wound around tooth 16. For example... Figure 4 As shown, a bobbin 70 is mounted on the tooth 16. The bobbin 70 is made of an insulating material, such as resin. The bobbin 70 is arranged to surround the outer periphery of the tooth 16. The windings constituting the coil 20 are wound in layers around the bobbin 70. The bobbin 70 is an insulating member that electrically insulates the stator core 10 from the coil 20. The bobbin 70 has a winding portion 71, a first flange portion 72, and a second flange portion 73.

[0044] The winding portion 71 has a cylindrical shape and extends radially. The spool 70 is moved relative to the stator core 10 by inserting the teeth 16 into the interior of the winding portion 71, thereby mounting the spool 70 to the stator core 10. The inner circumferential surface of the winding portion 71 faces the teeth 16. The inner circumferential surface of the winding portion 71 contacts the teeth 16. A layered winding is wound on the outer circumferential surface of the winding portion 71.

[0045] The first flange portion 72 is disposed at the radially outer end of the winding portion 71 and extends in both the circumferential and axial directions. The first flange portion 72 contacts the inner circumferential surface of the yoke portion 12. The second flange portion 73 is disposed at the radially inner end of the winding portion 71 and extends in both the circumferential and axial directions.

[0046] like Figure 4 As shown, the winding that begins to wind is guided to a position where it contacts the winding portion 71 and the first flange portion 72, and is wound around the winding portion 71. One side of the winding faces radially inward (in... Figure 4The lower side (as shown in the figure) is wound around the winding portion 71. When the winding reaches the second flange portion 73, it folds back towards the second layer, with one side of the winding facing radially outward (in...). Figure 4 The middle side (the upper side in the diagram) is wound around the first layer of windings.

[0047] Similarly, the third layer winding is wound around the second layer winding with one side facing radially inward, the fourth layer winding is wound around the third layer winding with one side facing radially outward, and the fifth layer winding is wound around the fourth layer winding with one side facing radially inward. The sixth layer winding is wound around the fifth layer winding near the first flange portion 72, thus ending the winding.

[0048] The second layer of winding is farther from tooth 16 than the first layer. The third layer of winding is farther from tooth 16 than the second layer. The sixth layer of winding, at the end of its winding, is farthest from tooth 16. The windings move further away from tooth 16 from the beginning of winding relative to tooth 16 toward the end of winding. The power supply side lead, described later, is led out from the innermost diameter side of the layered winding around tooth 16. The neutral point side lead, described later, is led out from the outermost diameter side of the layered winding around tooth 16.

[0049] Figure 4 An example is shown where a winding with six layers is wound around the bobbin 70. The number of layers in the winding wound around the bobbin 70 can be five or fewer, or seven or more. The number of windings in each layer disposed between the first flange portion 72 and the second flange portion 73 is also arbitrary.

[0050] Figure 5 This is the wiring diagram for stator 4. The U-phase input terminal 21U, V-phase input terminal 31V, and W-phase input terminal 41W are electrically connected to an inverter (not shown). Three-phase AC power is input to the U-phase input terminal 21U, V-phase input terminal 31V, and W-phase input terminal 41W.

[0051] The U-phase power supply conductor 22U is connected to the U-phase input terminal 21U. A U-phase power supply side lead-out line 23U1 is drawn from the starting end of the winding of the U-phase coil 24Up1, and is connected to the U-phase power supply conductor 22U. The U-phase input terminal 21U, the U-phase power supply conductor 22U, and the U-phase power supply side lead-out line 23U1 constitute the power supply path to the U-phase coils 24Up1 and 24Up2.

[0052] When U-phase coil 24Up1 and U-phase coil 24Up2 are viewed from the same direction, the winding directions of the windings are the same. Figure 5 The winding of the U-phase coil 24Up1 shown is wound counterclockwise around tooth 1601. Figure 2 , 3The U-phase winding of the U-phase coil 24Up2 is wound counterclockwise around tooth 1602. Adjacent teeth 1601 and 1602 in the circumferential direction have U-phase windings of the same phase wound in the same direction.

[0053] The U-phase lap conductor 25U12 connects to both the U-phase coils 24Up1 and 24Up2. The U-phase lap conductor 25U12 electrically connects the winding end of the U-phase coil 24Up1 to the winding start end of the U-phase coil 24Up2. Adjacent U-phase coils 24Up1 and 24Up2 in the circumferential direction are connected in series via the U-phase lap conductor 25U12. The U-phase lap conductor 25U12 can be positioned radially outside or radially inside the first flange portion 72 of the spool 70.

[0054] The U-phase neutral point lead 26U2 is led out from the winding end of the U-phase coil 24Up2. The U-phase neutral point lead 26U2 is connected to the neutral point 52 via the neutral conductor 54. The neutral conductor 54 electrically connects the U-phase coil 24Up2 to the neutral point 52.

[0055] A U-phase power supply lead 23U8 is drawn from the winding start end of the U-phase coil 24Um8, and is connected to the U-phase power supply conductor 22U. The U-phase input terminal 21U, the U-phase power supply conductor 22U, and the U-phase power supply lead 23U8 constitute the power supply path to the U-phase coils 24Um8 and 24Um7.

[0056] When U-phase coil 24Um8 and U-phase coil 24Um7 are viewed from the same direction, the winding directions of the windings are the same. Figure 5 The winding of the U-phase forming U-phase coil 24Um8 shown is wound clockwise on tooth 1608, and the winding of the U-phase forming U-phase coil 24Um7 is wound clockwise on tooth 1607. Adjacent teeth 1607 and 1608 in the circumferential direction have U-phase windings of the same phase wound in the same direction.

[0057] The U-phase lap conductor 25U78 connects to both the U-phase coil 24Um7 and the U-phase coil 24Um8. The U-phase lap conductor 25U78 electrically connects the winding end of the U-phase coil 24Um8 to the winding start end of the U-phase coil 24Um7. Adjacent U-phase coils 24Um7 and 24Um8 in the circumferential direction are connected in series via the U-phase lap conductor 25U78. The U-phase lap conductor 25U78 can be positioned radially outside or radially inside the first flange portion 72 of the spool 70.

[0058] U-phase neutral point side lead 26U7 is led out from the winding end of U-phase coil 24Um7. U-phase neutral point side lead 26U7 is connected to neutral point 51.

[0059] The V-phase power supply conductor 32V is connected to the V-phase input terminal 31V. The V-phase power supply side lead 33V4 is led out from the winding start end of the V-phase coil 34Vm4 and is connected to the V-phase power supply conductor 32V. The V-phase input terminal 31V, the V-phase power supply conductor 32V, and the V-phase power supply side lead 33V4 constitute the power supply path to the V-phase coils 34Vm4 and 34Vm3.

[0060] When viewed from the same direction, the winding directions of V-phase coil 34Vm4 and V-phase coil 34Vm3 are the same. Figure 5 The winding of the V phase forming the V phase coil 34Vm4 is wound clockwise around tooth 1604, and the winding of the V phase forming the V phase coil 34Vm3 is wound clockwise around tooth 1603. Adjacent teeth 1603 and 1604 in the circumferential direction have V phase windings of the same phase wound in the same direction.

[0061] The V-phase lap conductor 35V34 connects to both the V-phase coil 34Vm3 and the V-phase coil 34Vm4. The V-phase lap conductor 35V34 electrically connects the winding end of the V-phase coil 34Vm4 to the winding start end of the V-phase coil 34Vm3. Adjacent V-phase coils 34Vm3 and 34Vm4 in the circumferential direction are connected in series via the V-phase lap conductor 35V34. The V-phase lap conductor 35V34 can be positioned radially outside or radially inside the first flange portion 72 of the spool 70.

[0062] The V-phase neutral point lead 36V3 is led out from the winding end of the V-phase coil 34Vm3. The V-phase neutral point lead 36V3 is connected to the neutral point 52 via the neutral conductor 54. The neutral conductor 54 electrically connects the V-phase coil 34Vm3 to the neutral point 52.

[0063] The V-phase power supply lead 33V9 is led out from the winding start end of the V-phase coil 34Vp9, and is connected to the V-phase power supply conductor 32V. The V-phase input terminal 31V, the V-phase power supply conductor 32V, and the V-phase power supply lead 33V9 constitute the power supply path to the V-phase coils 34Vp9 and 34Vp10.

[0064] When viewed from the same direction, the winding directions of V-phase coil 34Vp9 and V-phase coil 34Vp10 are the same. Figure 5The winding of the V phase forming the V phase coil 34Vp9 is wound counterclockwise around tooth 1609, and the winding of the V phase forming the V phase coil 34Vp10 is wound counterclockwise around tooth 1610. Adjacent teeth 1609 and 1610 in the circumferential direction have V phase windings of the same phase wound in the same direction.

[0065] The V-phase lap conductor 35V910 connects to both the V-phase coils 34Vp9 and 34Vp10. The V-phase lap conductor 35V910 electrically connects the winding end of the V-phase coil 34Vp9 to the winding start end of the V-phase coil 34Vp10. Adjacent V-phase coils 34Vp9 and 34Vp10 are connected in series via the V-phase lap conductor 35V910. The V-phase lap conductor 35V910 can be positioned radially outside or radially inside the first flange portion 72 of the spool 70.

[0066] The V-phase neutral point lead 36V10 is led out from the winding end of the V-phase coil 34Vp10. The V-phase neutral point lead 36V10 is connected to the neutral point 51 via the neutral conductor 53. The neutral conductor 53 is a different component from the neutral conductor 54. The neutral conductor 53 electrically connects the V-phase coil 34Vp10 to the neutral point 51.

[0067] The W-phase power supply conductor 42W is connected to the W-phase input terminal 41W. A W-phase power supply lead 43W5 is drawn from the starting end of the winding of the W-phase coil 44Wp5 and connected to the W-phase power supply conductor 42W. The W-phase input terminal 41W, the W-phase power supply conductor 42W, and the W-phase power supply lead 43W5 constitute the power supply path to the W-phase coils 44Wp5 and 44Wp6.

[0068] When viewed from the same direction, the winding directions of W-phase coil 44Wp5 and W-phase coil 44Wp6 are the same. Figure 5 The winding of the W phase forming the W phase coil 44Wp5 shown is wound counterclockwise around tooth 1605, and the winding of the W phase forming the W phase coil 44Wp6 is wound counterclockwise around tooth 1606. Adjacent teeth 1605 and 1606 in the circumferential direction have the same phase W phase winding wound in the same direction.

[0069] The W-phase lap conductor 45W56 connects to both the W-phase coils 44Wp5 and 44Wp6. The W-phase lap conductor 45W56 electrically connects the winding end of the W-phase coil 44Wp5 to the winding start end of the W-phase coil 44Wp6. Adjacent W-phase coils 44Wp5 and 44Wp6 in the circumferential direction are connected in series via the W-phase lap conductor 45W56. The W-phase lap conductor 45W56 can be positioned radially outside or radially inside the first flange portion 72 of the spool 70.

[0070] A neutral point lead 46W6 is drawn from the winding end of phase W coil 44Wp6. The neutral point lead 46W6 is connected to the neutral point 51.

[0071] A W-phase power supply lead 43W12 is drawn from the starting end of the winding of the W-phase coil 44Wm12, and is connected to the W-phase power supply conductor 42W. The W-phase input terminal 41W, the W-phase power supply conductor 42W, and the W-phase power supply lead 43W12 constitute the power supply path to the W-phase coils 44Wm12 and 44Wm11.

[0072] When viewed from the same direction, the winding directions of W-phase coil 44Wm12 and W-phase coil 44Wm11 are the same. Figure 5 The winding of the W phase forming the W phase coil 44Wm12 is wound clockwise around tooth 1612, and the winding of the W phase forming the W phase coil 44Wm11 is wound clockwise around tooth 1611. The same phase W phase windings are wound in the same direction on adjacent teeth 1611 and 1612 along the circumferential direction.

[0073] The W-phase lap conductor 45W1112 connects to both the W-phase coil 44Wm11 and the W-phase coil 44Wm12. The W-phase lap conductor 45W1112 electrically connects the winding end of the W-phase coil 44Wm12 to the winding start end of the W-phase coil 44Wm11. Adjacent W-phase coils 44Wm11 and 44Wm12 in the circumferential direction are connected in series via the W-phase lap conductor 45W1112. The W-phase lap conductor 45W1112 can be positioned radially outside or radially inside the first flange portion 72 of the spool 70.

[0074] A neutral point lead 46W11 is drawn from the winding end of phase W coil 44Wm11. The neutral point lead 46W11 is connected to neutral point 52.

[0075] Figure 5The positive and negative signs indicate the winding direction towards tooth 16. The U-phase coils 24Up1 and 24Up2, the V-phase coils 34Vp9 and 34Vp10, and the W-phase coils 44Wp5 and 44Wp6 are all in... Figure 5 It is formed by winding the middle tooth 16 in a counterclockwise direction. Figure 5 In the middle, the U-phase coils 24Um7 and 24Um8, the V-phase coils 34Vm3 and 34Vm4, and the W-phase coils 44Wm11 and 44Wm12 are all formed by winding the coils in a clockwise direction around the tooth 16.

[0076] The current in phase U flows through phase U coils 24Up1 and 24Up2. In terms of current flow direction, phase U coil 24Up1 is upstream and phase U coil 24Up2 is downstream. A phase U power supply side lead 23U1 is drawn from the upstream phase U coil 24Up1 and connected to the phase U input terminal 21U. A phase U neutral point side lead 26U2 is drawn from the downstream phase U coil 24Up2 and directed towards the neutral point 52.

[0077] The current in phase V flows through phase V coils 34Vm3 and 34Vm4. In terms of current flow direction, phase V coil 34Vm4 is upstream, and phase V coil 34Vm3 is downstream. A phase V power supply lead 33V4 is drawn from the upstream phase V coil 34Vm4 and connected to the phase V input terminal 31V. A phase V neutral point lead 36V3 is drawn from the downstream phase V coil 34Vm3 and directed towards the neutral point 52.

[0078] The U-phase coil 24Up2, led out from the neutral point side lead 26U2 of the U-phase, is mounted on tooth 1602. The V-phase coil 34Vm3, led out from the neutral point side lead 36V3 of the V-phase, is mounted on tooth 1603. The U-phase coil 24Up2 and the V-phase coil 34Vm3 are respectively mounted on two adjacent teeth 16 in the circumferential direction. No interphase insulation paper is placed between the U-phase winding forming the U-phase coil 24Up2 and the V-phase winding forming the V-phase coil 34Vm3.

[0079] The current of phase W flows through phase W coils 44Wp5 and 44Wp6. In terms of current flow direction, phase W coil 44Wp5 is upstream and phase W coil 44Wp6 is downstream. A phase W power supply side lead 43W5 is drawn from the upstream phase W coil 44Wp5 and connected to the phase W input terminal 41W. A phase W neutral point side lead 46W6 is drawn from the downstream phase W coil 44Wp6 and directed towards the neutral point 51.

[0080] The U-phase winding is wound on two teeth 1601 and 1602 adjacent to the teeth 1603 and 1604 where the V-phase winding is wound, thus forming U-phase coils 24Up1 and 24Up2. The W-phase winding is wound on two adjacent teeth 1605 and 1606 on the opposite side of the teeth 1603 and 1604 from the U-phase coils 24Up1 and 24Up2, thus forming W-phase coils 44Wp5 and 44Wp6. A phase-to-phase insulating paper 62 is placed between the V-phase coil 34Vm4 and the W-phase coil 44Wp5. The phase-to-phase insulating paper 62 electrically insulates the V-phase winding forming the V-phase coil 34Vm4 from the W-phase winding forming the W-phase coil 44Wp5.

[0081] The current in phase U flows through phase U coils 24Um7 and 24Um8. In terms of current flow direction, phase U coil 24Um8 is upstream, and phase U coil 24Um7 is downstream. A phase U power supply side lead 23U8 is drawn from the upstream phase U coil 24Um8 and connected to the phase U input terminal 21U. A phase U neutral point side lead 26U7 is drawn from the downstream phase U coil 24Um7 and directed towards the neutral point 51.

[0082] The W-phase coil 44Wp6, with a neutral point lead 46W6, is mounted on tooth 1606. The U-phase coil 24Um7, with a neutral point lead 26U7, is mounted on tooth 1607. The W-phase coil 44Wp6 and the U-phase coil 24Um7 are respectively mounted on two adjacent teeth 16 in the circumferential direction. No interphase insulation paper is placed between the W-phase winding forming the W-phase coil 44Wp6 and the U-phase winding forming the U-phase coil 24Um7.

[0083] The current in phase V flows through phase V coils 34Vp9 and 34Vp10. In terms of current flow direction, phase V coil 34Vp9 is upstream, and phase V coil 34Vp10 is downstream. A phase V power supply lead 33V9 is drawn from the upstream phase V coil 34Vp9 and connected to the phase V input terminal 31V. A phase V neutral point lead 36V10 is drawn from the downstream phase V coil 34Vp10 and directed towards the neutral point 51.

[0084] W-phase windings are formed by winding W-phase coils 44Wp5 and 44Wp6 on two adjacent teeth 1605 and 1606, which are adjacent to teeth 1607 and 1608, which are on the opposite side of teeth 1607 and 1608 from W-phase coils 44Wp5 and 44Wp6. V-phase windings are formed on two adjacent teeth 1609 and 1610, which are on the opposite side of teeth 1607 and 1608 from W-phase coils 44Wp5 and 44Wp6. A phase-to-phase insulating paper 63 is placed between U-phase coil 24Um8 and V-phase coil 34Vp9. The phase-to-phase insulating paper 63 electrically insulates the U-phase winding forming U-phase coil 24Um8 from the V-phase winding forming V-phase coil 34Vp9.

[0085] The current of phase W flows through phase W coils 44Wm11 and 44Wm12. In terms of current flow direction, phase W coil 44Wm12 is upstream, and phase W coil 44Wm11 is downstream. A phase W power supply side lead 43W12 is drawn from the upstream phase W coil 44Wm12 and connected to the phase W input terminal 41W. A phase W neutral point side lead 46W11 is drawn from the downstream phase W coil 44Wm11 and directed towards the neutral point 52.

[0086] A V-phase coil 34Vp10, with a V-phase neutral point lead of 36V10, is mounted on tooth 1610. A W-phase coil 44Wm11, with a W-phase neutral point lead of 46W11, is mounted on tooth 1611. The V-phase coil 34Vp10 and the W-phase coil 44Wm11 are respectively mounted on two adjacent teeth 16 in the circumferential direction. No interphase insulation paper is placed between the V-phase winding forming the V-phase coil 34Vp10 and the W-phase winding forming the W-phase coil 44Wm11.

[0087] A V-phase winding is wound on two teeth 1609 and 1610 adjacent to the teeth 1611 and 1612 where the W-phase winding is wound, thereby forming V-phase coils 34Vp9 and 34Vp10. Two adjacent teeth 1601 and 1602 (refer to...) on the opposite side of teeth 1611 and 1612 from the V-phase coils 34Vp9 and 34Vp10... Figure 2 , 3 The U-phase winding is wound on the coil to form U-phase coils 24Up1 and 24Up2. A phase-to-phase insulating paper 61 is placed between the W-phase coil 44Wm12 and the U-phase coil 24Up1. The phase-to-phase insulating paper 61 electrically insulates the W-phase winding forming the W-phase coil 44Wm12 from the U-phase winding forming the U-phase coil 24Up1.

[0088] exist Figure 5 In the U-phase coils 24Up1, 24Up2, V-phase coils 34Vp9, 34Vp10, and W-phase coils 44Wp5, 44Wp formed by winding the coils counterclockwise around tooth 16, the upstream coils 20 in the direction of current flow are arranged in... Figure 5 The left side of the middle (in Figure 2 , 3 (The middle is the counter-clockwise side). Figure 5 In the U-phase coils 24Um7, 24Um8, V-phase coils 34Vm3, 34Vm4, and W-phase coils 44Wm11, 44Wm12 formed by winding the coils clockwise around the tooth 16, the coils 20 on the upstream side in the direction of current flow are arranged in... Figure 5 The right side of the middle (in Figure 2 , 3The middle is the side facing clockwise.

[0089] The U-phase neutral point lead-out line 26U7 from U-phase coil 24Um7, the V-phase neutral point lead-out line 36V10 from V-phase coil 34Vp10, and the W-phase neutral point lead-out line 46W6 from W-phase coil 44Wp6 are electrically connected at neutral point 51. The U-phase neutral point lead-out line 26U2 from U-phase coil 24Up2, the V-phase neutral point lead-out line 36V3 from V-phase coil 34Vm3, and the W-phase neutral point lead-out line 46W11 from W-phase coil 44Wm11 are electrically connected at neutral point 52.

[0090] Neutral points 51 and 52 are at the same potential. Neutral points 51 and 52 are grounded and have the same zero potential. The potential difference between neutral points 51 and 52 is maintained at approximately zero.

[0091] Figure 5 The U-phase power supply conductor 22U, V-phase power supply conductor 32V, W-phase power supply conductor 42W, and neutral conductors 53 and 54 shown can be composed of windings or busbars. Figure 6 This is a 3D view of the circular busbar 80. Figure 7 This is a top-down view of the circular busbar 80.

[0092] like Figure 6 , 7 As shown, the U-phase power supply conductor 22U, the V-phase power supply conductor 32V, the W-phase power supply conductor 42W, and the neutral conductors 53 and 54 are each composed of busbars that have a generally arc-shaped form when viewed from above. By arranging these busbars, a ring-shaped busbar 80 is formed that has a generally circular shape when viewed from above. The U-phase power supply conductor 22U, the V-phase power supply conductor 32V, the W-phase power supply conductor 42W, and the neutral conductors 53 and 54 are arranged with gaps between them.

[0093] Figure 8 This is a schematic diagram showing the resin 81 covering the annular busbar 80. Figure 7 Among the conductors shown, in Figure 8 The portion covered by resin 81 is indicated by dashed lines. The U-phase power supply conductor 22U, V-phase power supply conductor 32V, W-phase power supply conductor 42W, and neutral conductors 53 and 54 are integrally formed by the ring-shaped resin 81. The resin 81 ensures insulation between the U-phase power supply conductor 22U, V-phase power supply conductor 32V, W-phase power supply conductor 42W, and neutral conductors 53 and 54. The resin 81 also functions to position the U-phase power supply conductor 22U, V-phase power supply conductor 32V, W-phase power supply conductor 42W, and neutral conductors 53 and 54.

[0094] In the annular busbar 80, neutral conductors 53 and 54 are arranged radially at the innermost edge. Neutral conductors 53 and 54 have the same curvature and are arranged concentrically. The U-phase power supply conductor 22U has a smaller curvature than neutral conductors 53 and 54 and is arranged radially outside of neutral conductors 53 and 54. The W-phase power supply conductor 42W has a smaller curvature than U-phase power supply conductor 22U and is arranged radially outside of U-phase power supply conductor 22U.

[0095] The V-phase power supply conductor 32V has a first portion 32V1 disposed radially outside the U-phase power supply conductor 22U and a second portion 32V2 disposed radially inside the W-phase power supply conductor 42W. The second portion 32V2 is radially disposed between the neutral conductors 53 and 54 and the W-phase power supply conductor 42W.

[0096] The first portion 32V1 of the V-phase power supply conductor 32V and the W-phase power supply conductor 42W have the same curvature and are concentrically arranged. The second portion 32V2 of the V-phase power supply conductor 32V and the U-phase power supply conductor 22U have the same curvature and are concentrically arranged. The radial position of the V-phase power supply conductor 32V changes at the connection between the first portion 32V1 and the second portion 32V2. The first portion 32V1 is positioned radially outward compared to the second portion 32V2. The first portion 32V1 has a smaller curvature than the second portion 32V2.

[0097] The U-phase input terminal 21U is integrally formed with the U-phase power supply conductor 22U, extending radially outward from the arc-shaped portion of the U-phase power supply conductor 22U. The V-phase input terminal 31V is integrally formed with the V-phase power supply conductor 32V, extending radially outward from the arc-shaped portion of the V-phase power supply conductor 32V. The W-phase input terminal 41W is integrally formed with the W-phase power supply conductor 42W, extending radially outward from the arc-shaped portion of the W-phase power supply conductor 42W.

[0098] The U-phase power supply conductor 22U, V-phase power supply conductor 32V, W-phase power supply conductor 42W, and neutral conductors 53 and 54 constituting the annular busbar 80 are arranged radially at intervals. At any position circumferentially on the annular busbar 80, the number of conductors at the same circumferential position arranged radially is 3 or less. For example, at the position where the U-phase power supply conductor 22U has the U-phase input terminal 21U, the number of conductors arranged radially is 1. At the positions where the V-phase power supply conductor 32V has the V-phase input terminal 31V and the W-phase power supply conductor 42W has the W-phase input terminal 41W, the number of conductors arranged radially is 2. At the position where the neutral conductor 53 is located, the number of conductors arranged radially is 2 or 3. At the position where the neutral conductor 54 is located, the number of conductors arranged radially is 2 or 3.

[0099] The U-phase power supply conductor 22U has U-phase connection portions 22UC1 and 22UC8. The U-phase connection portions 22UC1 and 22UC8 are formed such that they stand upright from the arc-shaped portion of the U-phase power supply conductor 22U, and have hook-shaped portions at their front ends that bend radially inward. For example... Figure 8 As shown, the U-phase connecting parts 22UC1 and 22UC8 are disposed on the outside of the resin 81.

[0100] The U-phase power supply side lead 23U1, which is drawn from the U-phase coil 24Up1, is connected to the hook-shaped part of the U-phase connection part 22UC1. The U-phase power supply side lead 23U1 is arranged between the hook-shaped parts of the U-phase connection part 22UC1 in a way that it stands up from below, and is riveted to the hook-shaped parts and then welded to the hook-shaped parts, so that it is held by the hook-shaped parts.

[0101] The U-phase power supply side lead 23U8, which is drawn from the U-phase coil 24Um8, is connected to the hook-shaped part of the U-phase connection part 22UC8. The U-phase power supply side lead 23U8 is arranged between the hook-shaped parts of the U-phase connection part 22UC8 in a way that stands upright from below, and is riveted to the hook-shaped parts and then welded to the hook-shaped parts, thereby being held by the hook-shaped parts.

[0102] The V-phase power supply conductor 32V has V-phase connection portions 32VC4 and 32VC9. The V-phase connection portions 32VC4 and 32VC9 are formed such that they stand upright from the arc-shaped portion of the V-phase power supply conductor 32V, and have a hook-shaped portion at the front end that bends radially inward. For example... Figure 8 As shown, the V-phase connecting parts 32VC4 and 32VC9 are disposed on the outside of the resin 81.

[0103] The V-phase power supply side lead 33V4, which is drawn from the V-phase coil 34Vm4, is connected to the hook-shaped portion of the V-phase connection 32VC4. The V-phase power supply side lead 33V4 is arranged between the hook-shaped portions of the V-phase connection 32VC4 in a way that it stands upright from below. It is riveted to the hook-shaped portion and then welded to the hook-shaped portion, thereby being held by the hook-shaped portion.

[0104] The V-phase power supply side lead 33V9, which is drawn from the V-phase coil 34Vp9, is connected to the hook-shaped portion of the V-phase connection 32VC9. The V-phase power supply side lead 33V9 is arranged between the hook-shaped portions of the V-phase connection 32VC9 in a way that it stands upright from below, and is riveted to the hook-shaped portion and then welded to the hook-shaped portion, thereby being held by the hook-shaped portion.

[0105] The W-phase power supply conductor 42W has W-phase connection portions 42WC5 and 42WC12. The W-phase connection portions 42WC5 and 42WC12 are formed such that they stand upright from the arc-shaped portion of the W-phase power supply conductor 42W, and have a hook-shaped portion at the front end that bends radially inward. For example... Figure 8As shown, the W-phase connecting parts 42WC5 and 42WC12 are disposed on the outside of the resin 81.

[0106] The W-phase power supply side lead 43W5, which is drawn from the W-phase coil 44Wp5, is connected to the hook-shaped portion of the W-phase connection part 42WC5. The W-phase power supply side lead 43W5 is arranged between the hook-shaped portions of the W-phase connection part 42WC5 in a way that it stands upright from below, and is riveted to the hook-shaped portion and then welded to the hook-shaped portion, thereby being held by the hook-shaped portion.

[0107] The W-phase power supply side lead 43W12, which is drawn from the W-phase coil 44Wm12, is connected to the hook-shaped portion of the W-phase connection part 42WC12. The W-phase power supply side lead 43W12 is arranged between the hook-shaped portions of the W-phase connection part 42WC12 in a way that it stands upright from below, and is riveted to the hook-shaped portion and then welded to the hook-shaped portion, thereby being held by the hook-shaped portion.

[0108] The neutral conductor 53 has neutral connection portions 53C6, 53C7, and 53C10. The neutral connection portions 53C6, 53C7, and 53C10 are formed such that they stand upright from the arc-shaped portion of the neutral conductor 53, and have a hook-shaped portion bent radially inward at their front ends. Figure 8 As shown, neutral connecting parts 53C6, 53C7, and 53C10 are disposed on the outside of resin 81.

[0109] The W-phase neutral point side lead 46W6, which is drawn from the W-phase coil 44Wp6, is connected to the hook-shaped portion of the neutral connection part 53C6. The W-phase neutral point side lead 46W6 is arranged between the hook-shaped portions of the neutral connection part 53C6 in a way that it stands upright from below, and is riveted to the hook-shaped portion and then welded to the hook-shaped portion, thereby being held by the hook-shaped portion.

[0110] The U-phase neutral point side lead 26U7, which is drawn from the U-phase coil 24Um7, is connected to the hook-shaped part of the neutral connection part 53C7. The U-phase neutral point side lead 26U7 is arranged between the hook-shaped parts of the neutral connection part 53C7 in a way that it stands upright from below, and is riveted to the hook-shaped parts and then welded to the hook-shaped parts, thereby being held by the hook-shaped parts.

[0111] The V-phase neutral point side lead 36V10, which is drawn from the V-phase coil 34Vp10, is connected to the hook-shaped portion of the neutral connection portion 53C10. The V-phase neutral point side lead 36V10 is arranged between the hook-shaped portions of the neutral connection portion 53C10 in an upright manner from below, and is riveted to the hook-shaped portion and then welded to the hook-shaped portion, thereby being held by the hook-shaped portion.

[0112] The neutral conductor 54 has neutral connection portions 54C2, 54C3, and 54C11. The neutral connection portions 54C2, 54C3, and 54C11 are formed such that they stand upright from the arc-shaped portion of the neutral conductor 54, and have a hook-shaped portion bent radially inward at their front ends. Figure 8 As shown, neutral connecting parts 54C2, 54C3, and 54C11 are disposed on the outside of resin 81.

[0113] A U-phase neutral point side lead wire 26U2, which is drawn from the U-phase coil 24Up2, is connected to the hook-shaped part of the neutral connection part 54C2. The U-phase neutral point side lead wire 26U2 is arranged between the hook-shaped parts of the neutral connection part 54C2 in a way that stands upright from below, and is riveted to the hook-shaped parts and then welded to the hook-shaped parts, thereby being held by the hook-shaped parts.

[0114] The V-phase neutral point side lead 36V3, drawn from the V-phase coil 34Vm3, is connected to the hook-shaped portion of the neutral connection 54C3. The V-phase neutral point side lead 36V3 is arranged between the hook-shaped portions of the neutral connection 54C3 in a way that it stands upright from below, and is riveted to the hook-shaped portions and then welded to the hook-shaped portions, thereby being held by the hook-shaped portions.

[0115] The W-phase neutral point side lead 46W11, which is drawn from the W-phase coil 44Wm11, is connected to the hook-shaped portion of the neutral connection part 54C11. The W-phase neutral point side lead 46W11 is arranged between the hook-shaped portions of the neutral connection part 54C11 in a way that it stands upright from below, and is riveted to the hook-shaped portion and then welded to the hook-shaped portion, thereby being held by the hook-shaped portion.

[0116] The annular busbar 80 is disposed radially outward of the teeth 16 on which each coil 20 is mounted. The annular busbar 80 is disposed along the yoke 12. The annular busbar 80 is disposed overlapping the yoke 12. The annular busbar 80 is configured not to extend radially outward from the outer peripheral surface of the yoke 12, thereby avoiding radial enlargement of the stator 4.

[0117] When the neutral conductors 53 and 54 are formed by windings, the neutral conductors 53 and 54 can also be arranged radially outside the teeth 16 in the same manner as the annular busbar 80. Alternatively, the neutral conductors 53 and 54 can also be arranged at the ends of the coil.

[0118] It can also be in Figure 4 The first flange 72 of the spool 70 shown has a slot for arranging each lead wire. Each power supply side lead wire and each neutral point side lead wire are arranged through this slot, and can extend from the position of the yoke 12 of the stator core 10 in the radial direction to the position of the tooth 16.

[0119] exist Figure 5In the diagram, neutral point 51 is shown near W-phase coil 44Wp6, and neutral point 52 is shown near W-phase coil 44Wm11. However, the configuration of neutral points 51 and 52 is not limited. Neutral points 51 and 52 can be configured in any position as long as the U-phase, V-phase, and W-phase are connected in one place.

[0120] Neutral conductors 53 and 54 are configured as different components and are preferably not electrically connected to each other. If neutral conductors 53 and 54 are connected, for example, when a potential difference in line voltage is generated between the V-phase neutral point lead 36V10 and the W-phase neutral point lead 46W11, current flows between neutral points 51 and 52, and the current (circulating current) flows through the coil 20 connected to neutral point 52. This circulating current becomes a loss, reducing the efficiency of the electric motor 1. Therefore, neutral conductors 53 and 54 are preferably different components.

[0121] Figure 9 Here are wiring diagrams for other examples of stator 4. (See below.) Figure 9 The description records that, for Figure 5 The same compositional explanation is omitted, focusing on the same Figure 5 Different Figure 9 The unique composition will be explained.

[0122] exist Figure 5 In the example shown, relative to the coil 20 of each phase, the neutral point side lead of each phase extends on the extension side of the power supply side lead of each phase. Conversely, in Figure 9 In this configuration, the neutral point side lead of each phase extends relative to the coil 20 of each phase to the side opposite to the extension side of the power supply side lead of each phase. Figure 9 In the example shown, neutral conductors 53 and 54, as well as neutral points 51 and 52, can be positioned at the end of the coil or at a position radially inward of the tooth 16.

[0123] In the electric motor 1 of the embodiments described above, as follows: Figure 2 , 3 As shown, rotor 3 has 2 poles and 12 teeth (16). Figure 4 As shown, coil 20 is formed by winding the winding in a concentrated manner at tooth 16. (As...) Figure 2 , 3 As shown in Figure 5, two adjacent teeth 1601 and 1602 in the circumferential direction constitute tooth 171. The winding of phase U is connected in series with respect to the two teeth 1601 and 1602 constituting tooth 171 and wound in the same direction. Teeth 16 are arranged such that adjacent tooth sections are of different phases and the three phases are arranged sequentially in the circumferential direction.

[0124] A coil 20 is formed by winding the windings in a concentrated manner onto the teeth 16. The windings of the same phase are connected in series on adjacent teeth 16 in the circumferential direction and wound in the same direction. The teeth 16 are arranged such that adjacent teeth in the circumferential direction are of opposite phases, and the three phases are arranged sequentially in the circumferential direction. This allows for a simple and compact 2-pole, 12-slot electric motor 1. Because it has the minimum number of poles (2 poles), the electric motor 1 can rotate at high speed.

[0125] The winding forming coil 20 leaves the teeth 16 that are winding the winding as it moves from the start of winding relative to the teeth 16 toward the end of winding. By specifying the start and end positions of winding coil 20, the positions of the leads connected to the power supply conductors or neutral conductors of each phase can be determined, as can the positions of the insulating tubes used to insulate each lead.

[0126] Because the double windings of the same phase are connected in series, the voltage applied to the electric motor 1 is distributed to the two coils 20, thus halving the potential difference between adjacent coils of the same phase. By reducing the potential difference (intra-phase potential difference) between the films of adjacent coils 20, the withstand voltage stress on the insulation materials such as the film of the coils 20 and the spool 70 can be reduced. Therefore, insulation can be ensured with standard-specified magnetic conductors.

[0127] Compared to a 6-slot electric motor typically chosen in a two-pole configuration, the 12-slot electric motor 1 in this embodiment reduces magnetic flux fluctuations in the magnet and suppresses magnet heating by dispersing the demagnetizing field from the stator 4 to the two teeth 16. This achieves a skew effect from the stator 4 windings, reducing torque pulsation. By increasing the contact area between the coil 20 and the stator core 10 and increasing heat transfer, the coil 20 can be effectively cooled.

[0128] like Figure 2 , 3 As shown in Figure 5, a V-phase winding is wound on a tooth 172 adjacent to the tooth 171 of the coil with the U-phase coil, thereby forming two V-phase coils 34Vm3 and 34Vm4. A U-phase neutral point lead-out line 26U2 is drawn from the U-phase coil 24Up2 toward the neutral point 52. A V-phase neutral point lead-out line 36V3 is drawn from the V-phase coil 34Vm3 toward the neutral point 52. The tooth 1602 of the coil with the U-phase coil 24Up2 and the tooth 1603 of the coil with the V-phase coil 34Vm3 are adjacent to each other.

[0129] Both the U-phase coil 24Up2 and the V-phase coil 34Vm3 are connected to the neutral point 52, thus reducing the potential difference between them to a level where insulation is unnecessary. By arranging the U-phase coil 24Up2 and the V-phase coil 34Vm3 adjacent to each other, phase-to-phase insulation between them is eliminated. Since the number of locations requiring phase-to-phase insulation in the stator 4 can be reduced to three, the structure of the stator 4 can be simplified, and manufacturing costs can be reduced.

[0130] To form a 2-pole, 12-slot electric motor 1, it is necessary to position U-phase coil 24Up1 upstream of the current flow and U-phase coil 24Up2 downstream of the current flow in the two series-connected U-phase coils 24Up1 and 24Up2. Similarly, it is necessary to position V-phase coil 34Vm4 upstream of the current flow and V-phase coil 34Vm3 downstream of the two adjacent series-connected V-phase coils 34Vm3. As a result, U-phase coil 24Up2 and V-phase coil 34Vm3 are adjacent, and insulation between them is not required.

[0131] Figure 5 The V-phase coil 34Vp10 is connected to neutral point 51, and the adjacent W-phase coil 44Wm11 is connected to neutral point 52. The potentials of neutral points 51 and 52 are both zero and equal. Therefore, the potential difference between V-phase coil 34Vp10 and W-phase coil 44Wm11 is reduced to a level where insulation is unnecessary. Consequently, no phase-to-phase insulation is required between V-phase coil 34Vp10 and W-phase coil 44Wm11, thus reducing the number of locations requiring phase-to-phase insulation in stator 4 to only three.

[0132] like Figure 2 , 3 As shown in Figure 5, a W-phase coil 44Wm12 is formed by winding a W-phase winding on an adjacent tooth 176 on the opposite side of the tooth 176 opposite to the tooth 172 on which the V-phase coils 34Vm3 and 34Vm4 are mounted. An interphase insulating paper 61 is disposed between the U-phase winding forming the U-phase coil 24Up1 and the W-phase winding forming the W-phase coil 44Wm12. The interphase insulating paper 61 insulates the U-phase winding forming the U-phase coil 24Up1 and the W-phase winding forming the W-phase coil 44Wm12.

[0133] A U-phase power supply lead 23U1 is drawn from the U-phase coil 24Up1 and connected to the U-phase input terminal 21U. A W-phase power supply lead 43W12 is drawn from the W-phase coil 44Wm12 and connected to the W-phase input terminal 41W. A potential difference may occur between the adjacent U-phase coil 24Up1 and W-phase coil 44Wm12. By placing interphase insulating paper 61 between the U-phase coil 24Up1 and the W-phase coil 44Wm12, the U-phase coil 24Up1 and the W-phase coil 44Wm12 can be reliably insulated.

[0134] like Figure 5 As shown, the electric motor 1 also includes a U-phase power supply conductor 22U, a V-phase power supply conductor 32V, a W-phase power supply conductor 42W, and neutral conductors 53 and 54. The U-phase power supply conductor 22U forms the power supply path to the U-phase coils 24Up1 and 24Up2. The V-phase power supply conductor 32V forms the power supply path to the V-phase coils 34Vm3 and 34Vm4. The W-phase power supply conductor 42W forms the power supply path to the W-phase coils 44Wm11 and 44Wm12. The neutral conductor 54 electrically connects the U-phase coils 24Up1 and 24Up2 to the neutral point 52, connects the V-phase coils 34Vm3 and 34Vm4 to the neutral point 52, and connects the W-phase coils 44Wm11 and 44Wm12 to the neutral point 52. Figure 6 , 7 As shown, the U-phase power supply conductor 22U, the V-phase power supply conductor 32V, the W-phase power supply conductor 42W, and the neutral conductors 53 and 54 are all arc-shaped. Figure 8 As shown, the three-phase power supply conductors 22U, 32V, and 42W, and the neutral conductors 53 and 54 are positioned by annular resin 81. The number of U-phase power supply conductors 22U, V-phase power supply conductors 32V, W-phase power supply conductors 42W, and neutral conductors 53 and 54 arranged radially is 3 or less.

[0135] The number of conductors in phase U (22U), phase V (32V), phase W (42W), and neutral conductors 53 and 54, which are located at the same position in the circumferential direction, is three or less in any position in the circumferential direction. This reduces the space required for conductor placement, allowing for miniaturization of the stator 4. Furthermore, it reduces the number of locations requiring insulation between conductors.

[0136] like Figure 6 , 7 As shown, the V-phase power supply conductor 32V has a first portion 32V1 disposed radially outside the U-phase power supply conductor 22U and a second portion 32V2 disposed radially inside the W-phase power supply conductor 42W.

[0137] In this way, it is possible to achieve a structure in which the number of U-phase power supply conductors 22U, V-phase power supply conductors 32V, W-phase power supply conductors 42W, and neutral conductors 53 and 54 arranged radially is less than 3, thus avoiding the stator 4 from becoming too large radially.

[0138] Embodiments of the present invention have been described, but it should be considered that the embodiments disclosed herein are illustrative rather than restrictive in all respects. The scope of the invention is defined by the technical solutions and is intended to include all modifications within the meaning and scope of the equivalent technical solutions.

Claims

1. A rotary electric motor, wherein, The rotary motor includes: The stator includes a stator core and three-phase coils. The stator core includes a cylindrical yoke and 12 teeth protruding radially inward from the yoke. The three-phase coils are obtained by winding the windings around the teeth in a concentrated winding manner. as well as The rotor has two poles and is capable of rotating relative to the stator. The teeth are defined by two adjacent teeth in the circumferential direction forming a tooth section, and the windings of the same phase are connected in series with respect to the two teeth forming the tooth section and wound in the same direction. The teeth are arranged such that adjacent tooth portions are of different phases and the three phases are arranged sequentially in the circumferential direction.

2. The rotary motor according to claim 1, wherein, The three-phase coils are arranged relative to the six circumferentially arranged teeth in the order of the first-phase coil, the second-phase coil, and the third-phase coil. The second phase coil is assembled in the adjacent teeth of the teeth where the first phase coil is assembled. A first-phase lead is drawn from one side of the winding of the first-phase coil toward the neutral point, and a second-phase lead is drawn from one side of the winding of the second-phase coil toward the neutral point. The winding forming the coil of the first phase leading out of the first phase lead and the winding forming the coil of the second phase leading out of the second phase lead are respectively wound on two adjacent teeth in the circumferential direction.

3. The rotary motor according to claim 2, wherein, The third phase coil is assembled in the adjacent teeth on the opposite side of the teeth on which the first phase coil is assembled and the teeth on which the second phase coil is assembled. The stator further includes an interphase insulator disposed between adjacent windings of the coil forming the first phase and windings of the coil forming the third phase, thereby insulating the windings of the coil forming the first phase from the windings of the coil forming the third phase.

4. The rotary electric motor according to any one of claims 1 to 3, wherein, The rotary motor also features: Three-phase power supply conductors, which constitute the power supply path to the coils of the three phases; and A neutral conductor that electrically connects the three-phase coils to the neutral point. The three-phase power supply conductors and the neutral conductor are arranged along the yoke and each forms an arc shape. The three-phase power supply conductors and the neutral conductor are positioned by annular resin. The number of the three-phase power supply conductors and the neutral conductor arranged radially is 3 or less.

5. The rotary motor according to claim 4, wherein, The three-phase power supply conductors include a first-phase power supply conductor, a second-phase power supply conductor, and a third-phase power supply conductor. The second phase power supply conductor has a first portion disposed radially outside the first phase power supply conductor and a second portion disposed radially inside the third phase power supply conductor.

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