Stator, motor, flying body, and method for manufacturing stator

Abstract

This stator has a plurality of conductive wires partially wound around teeth while in a state of insulation from the teeth. Each conductive wire has: a plurality of winding parts that are wound around the teeth; and an end edge part that is the two end parts of the conductive wire and that is drawn out from a slot in the axial direction. A crossover wire part connecting the winding part and the end edge part is formed in a conductive wire for which the slot from which the end edge part is drawn out and a slot in which part of the winding part is disposed are different from each other. At least part of the crossover wire part and the end edge part is disposed at a position overlapping the teeth in the axial direction. The winding part is disposed between the crossover wire part and the end edge part, and the teeth.

Description

Stator, motor, flying object, and method of manufacturing stator

[0001] The present invention relates to a stator, a motor, an aircraft using the motor, and a method for manufacturing a stator.

[0002] A stator of a conventional multi-phase motor has an annular portion, multiple salient poles extending radially from the annular portion and arranged circumferentially, winding spaces formed between the salient poles, and salient pole windings wound around the salient poles (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2000-188839

[0004] In the above-described conventional stator, there is a concern that the wiring of the crossover wires connecting the salient pole windings in series may reduce the space factor, which is the proportion of the winding portion within the slot.

[0005] An object of the present invention is to provide a stator with an improved space factor of the windings.

[0006] An exemplary stator of the present invention includes an annular core back extending vertically in an axial direction, a plurality of teeth extending radially from the core back and arranged in a circumferential direction, slots formed between the teeth, and a plurality of conductors, portions of which are wound around the teeth while being insulated from the teeth. Each of the conductors has a plurality of winding portions wound around the teeth and edge portions at both ends of the conductor that are drawn out in the axial direction from the slot. The slots into which the edge portions are drawn and the slots into which portions of the winding portions are arranged are different, and the conductors have crossover portions connecting the winding portions to the edge portions. At least a portion of the crossover portions and the edge portions are positioned so as to overlap the teeth in the axial direction. The winding portions are positioned between the teeth and the crossover portions and the edge portions.

[0007] According to an exemplary stator of the present invention, the space factor of the windings is improved, thereby making it possible to increase the output and efficiency of the motor without increasing the size.

[0008] FIG. 1 is a cross-sectional view of an example of a motor. FIG. 2 is a plan view of an example of a stator. FIG. 3 is a bottom view of an example of a stator. FIG. 4 is a circuit diagram showing the wiring state of the conductors in the stator. FIG. 5 is a diagram showing a winding pattern of the conductors of the stator. FIG. 6 is a diagram showing a winding pattern of the conductors of the stator. FIG. 7 is a diagram showing a winding pattern of the conductors of the stator. FIG. 8 is a diagram showing a winding pattern of the conductors of the stator. FIG. 9 is a diagram showing a winding pattern of the conductors of the stator. FIG. 10 is a diagram showing a winding pattern of the conductors of the stator. FIG. 11 is a diagram showing a connection state for gathering together the end portions of the conductors of the stator shown in FIG. 7. FIG. 12 is a diagram showing a connection state for gathering together the end portions of the conductors of the stator shown in FIG. 8. FIG. 13 is a diagram showing a connection state for gathering together the end portions of the conductors of the stator shown in FIG. 9. FIG. 14 is a diagram showing a connection state for gathering together the end portions of the conductors of the stator shown in FIG. 10. FIG. 15 is a side view of the stator. FIG. 16 is a plan view showing a schematic configuration of an example of an aircraft.

[0009] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the direction parallel to the central axis Cx of the motor 100 extending in the up-down direction will be referred to as the "axial direction." Furthermore, the direction perpendicular to the central axis Cx will be referred to as the "radial direction," and the direction along the arc centered on the central axis Cx will be referred to as the "circumferential direction." With the motor 100 shown in FIG. 1 as a reference, the upper side will be defined as "one axial side S1" and the lower side will be defined as "the other axial side S2."

[0010] Note that the directions in the following description are defined for ease of explanation and may not match the directions when the motor 100 is actually in use.

[0011] <Motor 100> Fig. 1 is a cross-sectional view of an example of a motor 100. The motor 100 according to this embodiment is a DC brushless motor. As shown in Fig. 1, the motor 100 has a stator 10, a rotor 30, a shaft 40, a bracket 50, and a circuit board 60. The stator 10 is fixed to the bracket 50. The rotor 30 is fixed to the shaft 40. The shaft 40 is rotatably supported by the bracket 50.

[0012] <Bracket 50> The bracket 50 has a base portion 51, an attachment portion 52, and two bearings 53 and 54. The base portion 51 is disk-shaped. The base portion 51 is used, for example, as an attachment portion when attaching the motor 100 to a device. The attachment portion 52 is cylindrical and protrudes from an upper surface 511 of the base portion 51 to one axial side S1. Note that in the bracket 50 of this embodiment, the attachment portion 52 is formed integrally with the base portion 51, but is not limited to this.

[0013] The mounting portion 52 is cylindrical, and its center overlaps the central axis Cx. The mounting portion 52 has a stator mounting portion 521, a board mounting portion 522, and a shaft support hole 523. The stator mounting portion 521 is disposed on one axial side S1 of the board mounting portion 522. The stator core 11 of the stator 10 is fixed to the stator mounting portion 521. When the stator core 11 is fixed to the stator mounting portion 521, the center of the stator core 11 overlaps the central axis Cx of the motor 100.

[0014] The circuit board 60 is formed with the circuitry required to drive the motor 100. The circuit board 60 is fixed in contact with the board mounting portion 522 by passing the board mounting portion 522 through a fixing hole 61 formed in the center and penetrating the circuit board 60 in the axial direction.

[0015] The shaft support hole 523 extends in the axial direction. Bearings 53 and 54 are disposed axially apart inside the shaft support hole 523. The shaft 40 is rotatably mounted to the mounting portion 52 by the bearings 53 and 54. The center of the shaft 40 coincides with the central axis Cx of the motor 100.

[0016] When the stator 10 and the circuit board 60 are attached to the attachment portion 52, the circuit board 60 is disposed on the other axial side S2 of the stator 10. More specifically, the circuit board 60 is disposed between the stator 10 and the base portion 51.

[0017] <Rotor 30 and Shaft 40> The rotor 30 has a rotor core 31 and a magnet 32. The rotor core 31 has a rotor top plate 311 and a rotor cylinder 312. The rotor top plate 311 is disk-shaped and extends in a direction perpendicular to the central axis Cx. A portion of the shaft 40 that protrudes from an end of the attachment portion 52 on one axial side S1 is fixed to the center of the rotor top plate 311. In other words, the rotor top plate 311 is positioned on the one axial side S1 of the attachment portion 52, and is positioned on the attachment portion 52 so as to be rotatable about the central axis Cx.

[0018] The rotor cylindrical portion 312 extends from the radial outer edge of the rotor top plate portion 311 toward the other axial side S2. The rotor cylindrical portion 312 is disposed radially outward of the stator 10. A magnet 32 ​​is disposed on an inner circumferential surface 313 of the rotor cylindrical portion 312. The magnet 32 ​​is cylindrical, and an inner circumferential surface 321 of the magnet 32 ​​faces the radial outer edge of the stator core 11 of the stator 10 with a radial gap therebetween. That is, the motor 100 according to this embodiment is an outer rotor type DC brushless motor in which the rotor 30 is disposed outside the stator 10. Furthermore, the inner circumferential surface 321 of the magnet 32 ​​has north and south poles arranged alternately in the circumferential direction. The rotor core 31 is formed of a magnetic material and serves as a back yoke. Hereinafter, the motor 100 will be described as an outer rotor type motor, but the same applies to an inner rotor type motor in which the rotor 30 is disposed inside the stator 10.

[0019] <Stator 10> Next, the stator 10 will be described. Fig. 2 is a plan view of an example of the stator 10. Fig. 3 is a bottom view of an example of the stator 10. The stator 10 has a stator core 11 and conductors 20. The stator core 11 is formed of a magnetic material. For example, the stator core 11 may be a laminated body in which electromagnetic steel plates are stacked in the axial direction, or a sintered body in which magnetic material powder is sintered. The stator core 11 has a core back 12 and teeth 13.

[0020] The core back 12 has an annular shape and extends in the axial direction extending vertically. The core back 12 is fixed to the stator mounting portion 521 of the mounting portion 52 in a state of contact with the outer peripheral surface of the stator mounting portion 521 (see FIG. 1 ).

[0021] The teeth 13 extend radially from the core back 12 and are arranged side by side in the circumferential direction. Twelve teeth 13 are provided on the stator core 11. The twelve teeth 13 are designated as first teeth 13A to twelfth teeth 13L. As shown in FIG. 2, in a plan view, the second teeth 13B are adjacent to the first teeth 13A in the counterclockwise direction. The third teeth 13C to twelfth teeth 13L are similarly arranged in order in the counterclockwise direction. The first teeth 13A are adjacent to the twelfth teeth 13L in the counterclockwise direction.

[0022] In the stator core 11, the slots 14 are formed between the teeth 13. Twelve slots 14 are provided in the stator core 11. In a plan view, the first slot 14A is adjacent to the first tooth 13A in the clockwise direction. The second slot 14B to the twelfth slot 14L are also similarly formed.

[0023] <Conductive Wires 20> Figure 4 is a circuit diagram showing the wiring state of the conductive wires 20 in the stator 10. The conductive wires 20 are configured, for example, by covering a core wire made of copper with a coating made of an insulating material. The stator 10 has multiple conductive wires 20. Some of the multiple conductive wires 20 are wound around the teeth 13 while being insulated from the teeth 13.

[0024] Each conductor 20 has a winding portion 21, a jumper portion 22, and an edge portion 23. The winding portion 21 is formed by winding the conductor 20 around the tooth 13. Because the conductor 20 is covered with a coating made of an insulating material, when wound around the tooth 13, the conductors 20 are insulated from each other and from the tooth 13. Note that to ensure insulation between the conductor 20 and the tooth 13, an insulating insulator (not shown) may be disposed between the tooth 13 and the conductor 20.

[0025] A winding portion 21 is provided for each tooth 13, and 12 winding portions 21 are provided in the stator 10. The winding portion 21 provided on the first tooth 13A is referred to as the first winding portion 21A. Similarly, the winding portions provided on the second tooth 13B to the twelfth tooth 13L are referred to as the second winding portion 21B to the twelfth winding portion 21L.

[0026] An electric current is supplied to the conductor 20 from the circuit board 60. When an electric current is supplied to the conductor 20, the winding portion 21 is excited. In the stator 10, the teeth 13 on which the winding portion 21 is arranged are also excited. In the motor 100, the rotor 30 is rotated by the magnetic force generated in the winding portion 21 and the teeth 13 and the magnetic force of the magnet 32 ​​arranged on the rotor 30.

[0027] The conductors 20 are divided into three systems (hereinafter referred to as three phases) based on the timing at which current is supplied. The three phases are U-phase, V-phase, and W-phase. The stator 10 has a first conductor 20A and a second conductor 20B to which U-phase current is supplied, a third conductor 20C and a fourth conductor 20D to which V-phase current is supplied, and a fifth conductor 20E and a sixth conductor 20F to which W-phase current is supplied.

[0028] The edge portions 23 are both ends of the conductor wire 20. The edge portions 23 are drawn out in the axial direction from the slots 14. The edge portions 23 have lead-out portions 24, processed wire portions 25, and soldered portions 26. The processed wire portions 25 and lead-out portions 24 of the edge portions 23 are drawn out from the slots 14 to the other axial side S2. In other words, the drawing directions of all the edge portions 23 are the same in the axial direction.

[0029] The lead-out wire portions 24 are drawn to the other axial side S2 of the eighth slot 14H, the ninth slot 14I, and the tenth slot 14J. That is, the lead-out wire portions 24 are drawn from each of the three circumferentially adjacent slots 14H, 14I, and 14J. The end edge portions 23 drawn from the slots 14 other than the eighth slot 14H, the ninth slot 14I, and the tenth slot 14J are treated wire portions 25. In the stator 10, the treated wire portions 25 are drawn from the first slot 14A and the fifth slot 14E.

[0030] The processed wire portions 25 are drawn out from slots 14A and 14E that are circumferentially separated from the slots 14H, 14I, and 14J through which the lead-out portions 24 are drawn out. The processed wire portions 25 are longer than the lead-out portions 24. Therefore, the processed wire portions 25 are routed in the circumferential direction on the other axial side S2 of the stator core 11 and connected to the corresponding lead-out portions 24. The end edge portions 23 form soldering portions 26 to which they are soldered.

[0031] The soldered portion 26 is directly connected to the circuit board 60, which is located on the other axial side S2 of the stator 10. By extending the end edge portion 23 in the same axial direction in this manner, the end edge portion 23 can be directly connected to the circuit board 60. In other words, there is no need to provide a wiring member such as a bus bar to connect the end edge portion 23 to the circuit board 60.

[0032] 15 , the stator 10 has three soldering portions 26. In the stator 10, the three soldering portions 26 are arranged on the other axial side S2 of the eighth slot 14H, the ninth slot 14I, and the tenth slot 14J, which are aligned in the circumferential direction. The soldering portions 26 arranged on the other axial side S2 of the eighth slot 14H, the ninth slot 14I, and the tenth slot 14J are referred to as a first soldering portion 26A, a second soldering portion 26B, and a third soldering portion 26C, respectively. Arranging the three soldering portions 26 close to each other in the circumferential direction improves the workability when connecting the soldering portions 26 to the circuit board 60.

[0033] The crossover portion 22 connects the winding portion 21 and the edge portion 23. More specifically, the crossover portion 22 is formed on a conductor in which the slot 14 in which a portion of the winding portion 21 is disposed is different from the slot 14 from which the edge portion 23 is drawn. The crossover portion 22 connects the winding portion 21 and the edge portion 23 drawn from a slot 14 different from the slot 14 in which the winding portion 21 is disposed. As will be described in detail later, the first conductor 20A, the fourth conductor 20D, the fifth conductor 20E, and the sixth conductor 20F are formed with crossover portions 22. Furthermore, the second conductor 20B and the third conductor 20C are not formed with crossover portions 22.

[0034] 4, the winding section 21 of the stator 10 is divided into a U-phase winding section 21U, a V-phase winding section 21V, and a W-phase winding section 21W. The U-phase winding section 21U, the V-phase winding section 21V, and the W-phase winding section 21W are delta-connected.

[0035] The first winding portion 21A, the second winding portion 21B, the seventh winding portion 21G, and the eighth winding portion 21H constitute the U-phase winding portion 21U. The first winding portion 21A and the second winding portion 21B constitute the first U-phase winding pair U1 and are formed by the first conductor 20A. As shown in FIG. 4, the first winding portion 21A and the second winding portion 21B are connected in series. The seventh winding portion 21G and the eighth winding portion 21H constitute the second U-phase winding pair U2 and are formed by the second conductor 20B. As shown in FIG. 4, the seventh winding portion 21G and the eighth winding portion 21H are connected in series. The first U-phase winding pair U1 and the second U-phase winding pair U2 are connected in parallel to form the U-phase winding portion 21U.

[0036] The third winding portion 21C, the fourth winding portion 21D, the ninth winding portion 21I, and the tenth winding portion 21J form the V-phase winding portion 21V. The ninth winding portion 21I and the tenth winding portion 21J form the first V-phase winding pair V1 and are formed by the third conductor 20C. As shown in FIG. 4, the ninth winding portion 21I and the tenth winding portion 21J are connected in series. The third winding portion 21C and the fourth winding portion 21D form the second V-phase winding pair V2 and are formed by the fourth conductor 20D. As shown in FIG. 4, the third winding portion 21C and the fourth winding portion 21D are connected in series. The first V-phase winding pair V1 and the second V-phase winding pair V2 are connected in parallel to form the V-phase winding portion 21V.

[0037] Furthermore, the fifth winding portion 21E, the sixth winding portion 21F, the eleventh winding portion 21K, and the twelfth winding portion 21L form the W-phase winding portion 21W. The eleventh winding portion 21K and the twelfth winding portion 21L form the first W-phase winding pair W1 and are formed by the fifth conductor 20E. As shown in FIG. 4, the eleventh winding portion 21K and the twelfth winding portion 21L are connected in series. The fifth winding portion 21E and the sixth winding portion 21F form the second W-phase winding pair W2 and are formed by the sixth conductor 20F. As shown in FIG. 4, the fifth winding portion 21E and the sixth winding portion 21F are connected in series. The first W-phase winding pair W1 and the second W-phase winding pair W2 are connected in parallel to form the W-phase winding portion 21W.

[0038] As shown in FIG. 2, in a plan view, the stator 10 has a first U-phase winding pair U1, a second V-phase winding pair V2, a second W-phase winding pair W2, a second U-phase winding pair U2, a first V-phase winding pair V1, and a first W-phase winding pair W1 arranged in this order.

[0039] The following describes a method for manufacturing a stator for attaching the first conducting wires 20A to the sixth conducting wires 20F to the stator core 11. The method for manufacturing the stator core 11 includes a winding process for winding the first conducting wires 20A to the sixth conducting wires 20F around the teeth 13 of the stator core 11, and a wiring process for processing the end edges 23 of the first conducting wires 20A to the sixth conducting wires 20F arranged on the stator core 11.

[0040] First, the winding process will be described with reference to the drawings. Figures 5 to 10 are diagrams showing the winding patterns when winding the conductors 20A to 20F. Each of Figures 5 to 10 shows the stator core 11 unfolded, with the teeth 13 aligned in a straight line, as viewed from the radially outer side. In Figures 5 to 10, the winding portion 21, edge portion 23, and connecting wire portion 27 are shown with solid lines, and the crossover portion 22 is shown with dashed lines.

[0041] In the winding process, a winding portion 21 is formed by winding a conductor 20 around a plurality of teeth 13 that extend radially from an annular core back 12 extending in the axial direction extending up and down and that are arranged side by side in the circumferential direction, and an edge portion 23 is pulled out in the axial direction from a slot 14 formed between the teeth 13. In addition, in the winding process, if the slot 14 from which the edge portion 23 is pulled out is different from the slot 14 in which a part of the winding portion 21 is arranged, a crossover portion 22 that connects the winding portion 21 and the edge portion 23 is formed.

[0042] In the winding process, the first V-phase winding pair V1, the second U-phase winding pair U2, the first W-phase winding pair W1, the second W-phase winding pair W2, the first U-phase winding pair U1, and the second V-phase winding pair V2 are formed in this order.

[0043] First, the third conductor 20C is routed through the stator core 11 to form the first V-phase winding pair V1. As shown in Fig. 5 , the third conductor 20C is inserted into the ninth slot 14I from the other axial side S2 and wound around the ninth tooth 13I to form the ninth winding portion 21I. At this time, the third conductor 20C is wound around the ninth tooth 13I in a clockwise direction when viewed from the radial outside. That is, the third conductor 20C is routed through the ninth slot 14I from the other axial side S2 to the one axial side S1, and through the tenth slot 14J from the one axial side S1 to the other axial side S2.

[0044] After the ninth winding portion 21I is completed, the third conductor 20C is wound around the tenth tooth 13J to form the tenth winding portion 21J. At this time, the third conductor 20C is wound around the tenth tooth 13J in a counterclockwise direction when viewed from the radial outside. That is, the third conductor 20C is routed through the tenth slot 14J from one axial side S1 to the other axial side S2, and through the eleventh slot 14K from the other axial side S2 to the one axial side S1.

[0045] After the tenth winding portion 21J is completed, the third conducting wire 20C is drawn out from the other axial side S2 of the tenth slot 14J to the outside of the stator core 11. That is, the third conducting wire 20C forms the ninth winding portion 21I and the tenth winding portion 21J, and one of the end edges 23 is drawn out from the ninth slot 14I to the other axial side S2, and the other end edge 23 is drawn out from the tenth slot 14J to the other axial side S2. The end edge 23 drawn out from the ninth slot 14I is the first lead-out portion 24A, and the end edge 23 drawn out from the tenth slot 14J is the second lead-out portion 24B.

[0046] When forming the ninth winding portion 21I and the tenth winding portion 21J in the first V-phase winding pair V1, the third conductor 20C is routed through the tenth slot 14J from one axial side S1 to the other axial side S2. The ninth winding portion 21I and the tenth winding portion 21J are formed by winding the third conductor 20C around the circumferentially adjacent ninth tooth 13I and tenth tooth 13J. The third conductor 20C is routed from the ninth winding portion 21I to the tenth winding portion 21J. The wiring of the third conductor 20C connecting the circumferentially adjacent ninth winding portion 21I and tenth winding portion 21J is referred to as a connecting wire portion 27. The connecting wire portion 27 may be part of the tenth winding portion 21J. Hereinafter, when the conducting wire 20 is wound continuously around the teeth 13 adjacent in the circumferential direction, the connecting wire portion 27 connecting the winding portions 21 together will be treated as a wire constituting the winding portion 21.

[0047] In this manner, the first V-phase winding pair V1 is formed by winding the third conducting wire 20C around the teeth 13 of the stator core 11. In the stator core 11, the third conducting wire 20C is maintained in a state where it is wound around the ninth tooth 13I and the tenth tooth 13J. Similarly, the other conducting wires 20 are maintained in a state where they are wired to the stator core 11. As described above, the third conducting wire 20C does not have a crossover portion 22 formed therein.

[0048] Next, the second conductor 20B is routed through the stator core 11 to form the second U-phase winding pair U2. As shown in FIG. 6 , the second conductor 20B is inserted into the ninth slot 14I from the other axial side S2 and wound around the eighth tooth 13H to form the eighth winding portion 21H. At this time, the second conductor 20B is wound around the eighth tooth 13H in a counterclockwise direction when viewed from the radial outside. That is, the second conductor 20B is routed through the ninth slot 14I from the other axial side S2 to the one axial side S1, and through the eighth slot 14H from the one axial side S1 to the other axial side S2.

[0049] After the eighth winding portion 21H is completed, the second conductor 20B is pulled out from the other axial side S2 of the eighth slot 14H, passes through the other axial side S2 of the seventh tooth 13G, and is routed from the other axial side S2 of the seventh slot 14G to the one axial side S1. The portion of the second conductor 20B that connects from the other axial side S2 of the eighth slot 14H to the other axial side S2 of the seventh slot 14G is the connecting wire portion 27. The connecting wire portion 27 constitutes a part of the seventh winding portion 21G.

[0050] The second conductor 20B is then wound around the seventh tooth 13G to form a seventh winding portion 21G. At this time, the second conductor 20B is wound around the seventh tooth 13G in a clockwise direction when viewed from the radial outside. That is, the second conductor 20B is routed through the eighth slot 14H from one axial side S1 to the other axial side S2, and through the seventh slot 14G from the other axial side S2 to one axial side S1.

[0051] After the seventh winding portion 21G is completed, the second conductor 20B is drawn out from the other axial side S2 of the eighth slot 14H to the outside of the stator core 11. That is, the second conductor 20B forms the seventh winding portion 21G and the eighth winding portion 21H, and one of the end edges 23 is drawn out from the eighth slot 14H to the other axial side S2, and the other is drawn out from the ninth slot 14I to the other axial side S2. The end edge 23 drawn out from the eighth slot 14H is the third lead portion 24C, and the end edge 23 drawn out from the ninth slot 14I is the fourth lead portion 24D. As described above, the second conductor 20B does not have a crossover portion 22 formed thereon.

[0052] Next, the fifth conductor 20E is routed through the stator core 11 to form the first W-phase winding pair W1. As shown in FIG. 7 , the fifth conductor 20E forms a fifth lead-out portion 24E, an eleventh winding portion 21K, a twelfth winding portion 21L, and a first processed wire portion 25A. The fifth lead-out portion 24E is led out from the tenth slot 14J. Meanwhile, a portion of the eleventh winding portion 21K is disposed in the eleventh slot 14K and the twelfth slot 14L. Therefore, the fifth conductor 20E forms a crossover portion 22 that connects the fifth lead-out portion 24E and the eleventh winding portion 21K.

[0053] The winding process using the fifth conductor 20E will be described. The fifth conductor 20E is inserted into the tenth slot 14J from the other axial side S2. The fifth conductor 20E drawn out to the one axial side S1 is wired outside the tenth tooth 13J. The portion of the fifth conductor 20E wired outside the tenth tooth 13J is the crossover portion 22.

[0054] Before the fifth conductor 20E is routed, the tenth winding portion 21J is formed on the tenth tooth 13J. Therefore, even if the fifth conductor 20E is routed outside the tenth tooth 13J, the jumper portion 22 is not disposed between the tenth winding portion 21J and the tenth tooth 13J. In other words, the winding portion 21 is disposed between the jumper portion 22 and the tooth 13. This prevents a decrease in the space factor of the tenth winding portion 21J. The space factor is an index indicating the proportion of the conductor wire that constitutes the winding in the winding portion. The higher the space factor, the higher the output and efficiency of the motor 100.

[0055] 2, the crossover portion 22 is disposed between the radially outer end and the radially inner end of the tenth tooth 13J. That is, at least a portion of the crossover portion 22 is disposed in a position that axially overlaps with the tooth 13. By disposing the crossover portion 22 in this manner, interference between the crossover portion 22 and the stator mounting portion 521 of the mounting portion 52 is suppressed. This improves the workability of mounting the stator 10 to the stator mounting portion 521. Furthermore, interference between the crossover portion 22 and the rotor 30 is suppressed. This suppresses vibration and noise when the motor 100 is running.

[0056] The fifth conductor 20E is routed through the eleventh slot 14K from the one axial side S1 to the other axial side S2 and wound around the eleventh tooth 13K to form the eleventh winding portion 21K. At this time, the fifth conductor 20E is wound around the eleventh tooth 13K in a counterclockwise direction when viewed from the radial outside. That is, the fifth conductor 20E is routed through the eleventh slot 14K from the one axial side S1 to the other axial side S2, and through the twelfth slot 14L from the other axial side S2 to the one axial side S1.

[0057] After the eleventh winding portion 21K is completed, the fifth conductor 20E is pulled out from the other axial side S2 of the eleventh slot 14K, passes through the other axial side S2 of the eleventh tooth 13K, and is routed from the other axial side S2 of the twelfth slot 14L to the one axial side S1. The portion of the fifth conductor 20E that connects from the other axial side S2 of the eleventh slot 14K to the other axial side S2 of the twelfth slot 14L is the connecting wire portion 27. The connecting wire portion 27 constitutes a part of the eleventh winding portion 21K.

[0058] The fifth conductor 20E is then wound around the twelfth tooth 13L to form a twelfth winding portion 21L. At this time, the fifth conductor 20E is wound around the twelfth tooth 13L in a clockwise direction when viewed from the radial outside. That is, the fifth conductor 20E is routed through the twelfth slot 14L from the other axial side S2 to the one axial side S1, and through the first slot 14A from the one axial side S1 to the other axial side S2.

[0059] After the twelfth winding portion 21L is completed, the fifth conductor 20E is drawn out from the other axial side S2 of the first slot 14A to the outside of the stator core 11. That is, the fifth conductor 20E forms the eleventh winding portion 21K and the twelfth winding portion 21L, and one of the end edges 23 is drawn out from the tenth slot 14J to the other axial side S2, and the other is drawn out from the first slot 14A to the other axial side S2. The end edge 23 of the fifth conductor 20E drawn out from the tenth slot 14J is the fifth drawn-out wire portion 24E, and the end edge 23 drawn out from the first slot 14A is the first processed wire portion 25A.

[0060] In the fifth conducting wire 20E, the wire connecting the eleventh winding portion 21K and the fifth lead-out portion 24E is the crossover portion 22. As shown in Fig. 3, the lead-out position of the first processed wire portion 25A in the first slot 14A may be radially outward of the first to eighth lead-out portions 24A to 24H. This configuration makes it easier to route the processed wire portion 25 in the circumferential direction.

[0061] Next, the sixth conductor 20F is routed through the stator core 11 to form the second W-phase winding pair W2. As shown in FIG. 8 , the sixth conductor 20F forms a sixth lead-out portion 24F, a fifth winding portion 21E, a sixth winding portion 21F, and a second processed wire portion 25B. The sixth lead-out portion 24F is led out from the eighth slot 14H. Meanwhile, a portion of the sixth winding portion 21F is disposed in the sixth slot 14F and the seventh slot 14G. Therefore, the sixth conductor 20F forms a crossover portion 22 that connects the sixth lead-out portion 24F and the sixth winding portion 21F.

[0062] The winding process using the sixth conductor 20F will be described. The sixth conductor 20F is inserted into the fifth slot 14E from the other axial side S2 and wound around the fifth tooth 13E to form the fifth winding portion 21E. At this time, the sixth conductor 20F is wound around the fifth tooth 13E in a clockwise direction when viewed from the radial outside. That is, the sixth conductor 20F is routed through the fifth slot 14E from the other axial side S2 to the one axial side S1, and through the sixth slot 14F from the one axial side S1 to the other axial side S2.

[0063] After the fifth winding portion 21E is completed, the sixth conductor 20F is pulled out from the other axial side S2 of the sixth slot 14F, passes through the other axial side S2 of the sixth tooth 13F, and is routed from the other axial side S2 of the seventh slot 14G to the one axial side S1. The portion of the sixth conductor 20F that connects from the other axial side S2 of the sixth slot 14F to the other axial side S2 of the seventh slot 14G is the connecting wire portion 27. The connecting wire portion 27 constitutes a part of the sixth winding portion 21F.

[0064] The sixth conductor 20F is wound around the sixth tooth 13F to form a sixth winding portion 21F. At this time, the sixth conductor 20F is wound around the sixth tooth 13F in a counterclockwise direction when viewed from the radial outside. That is, the sixth conductor 20F is routed through the sixth slot 14F from one axial side S1 to the other axial side S2, and through the seventh slot 14G from the other axial side S2 to the one axial side S1.

[0065] The sixth conducting wire 20F is drawn out to one axial side S1 of the seventh slot 14G, wired to one axial side S1 of the seventh tooth 13G, wired from one axial side S1 to the other axial side S2 of the eighth slot 14H, and drawn out to the outside of the stator core 11. The portion of the sixth conducting wire 20F that is wired around the outside of the seventh tooth 13G is a crossover portion 22.

[0066] Before the sixth conducting wire 20F is routed, the seventh winding portion 21G is formed on the seventh tooth 13G. This prevents the jumper portion 22 from being disposed between the seventh winding portion 21G and the seventh tooth 13G, thereby preventing a decrease in the space factor of the seventh winding portion 21G. Furthermore, as shown in FIG. 2 , the jumper portion 22 is disposed between the radially outer end and the radially inner end of the seventh tooth 13G. By disposing the jumper portion 22 in this manner, interference between the jumper portion 22 and the stator mounting portion 521 of the mounting portion 52 is prevented. Furthermore, interference between the jumper portion 22 and the rotor 30 is prevented. This reduces vibration and noise when the motor 100 is running.

[0067] The sixth conducting wire 20F forms the fifth winding portion 21E and the sixth winding portion 21F, and one of the end edges 23 is drawn out from the eighth slot 14H to the other axial side S2, and the other is drawn out from the fifth slot 14E to the other axial side S2. The end edge 23 of the sixth conducting wire 20F drawn out from the eighth slot 14H is the sixth drawn-out wire portion 24F, and the end edge 23 drawn out from the fifth slot 14E is the second processed wire portion 25B.

[0068] Next, the first conductor 20A is routed through the stator core 11 to form the first U-phase winding pair U1. As shown in FIG. 9 , the first conductor 20A forms a seventh lead-out portion 24G, a first winding portion 21A, a second winding portion 21B, and a third processed winding portion 25C. The seventh lead-out portion 24G is routed out of the ninth slot 14I. Meanwhile, a portion of the second winding portion 21B is disposed in the second slot 14B and the third slot 14C. Therefore, the first conductor 20A forms a crossover portion 22 that connects the seventh lead-out portion 24G and the second winding portion 21B. The crossover portion 22 of the first conductor 20A is routed to the other axial side S2 of the first tooth 13A, the twelfth tooth 13L, and the eleventh tooth 13K. The crossover wire portion 22 is routed through the eleventh slot 14K from the other axial side S2 to the one axial side S1. Furthermore, the crossover wire portion 22 is routed to the one axial side S1 of the tenth tooth 13J and the ninth tooth 13I, and is routed so as to penetrate the ninth slot 14J from the one axial side S1 to the other axial side S2.

[0069] The winding process using the first conductor 20A will be described. The first conductor 20A is inserted into the first slot 14A from the other axial side S2 and wound around the first tooth 13A to form the first winding portion 21A. At this time, the first conductor 20A is wound around the first tooth 13A in a clockwise direction when viewed from the radial outside. That is, the first conductor 20A is routed through the first slot 14A from the other axial side S2 to the one axial side S1, and through the second slot 14B from the one axial side S1 to the other axial side S2.

[0070] After the first winding portion 21A is completed, the first conductor 20A is pulled out from the other axial side S2 of the second slot 14B, passes through the other axial side S2 of the second tooth 13B, and is routed from the other axial side S2 of the third slot 14C to the one axial side S1. The portion of the first conductor 20A that connects the other axial side S2 of the second slot 14B to the other axial side S2 of the third slot 14C is the connecting wire portion 27. The connecting wire portion 27 constitutes the second winding portion 21B.

[0071] The first conductor 20A is wound around the second tooth 13B to form a second winding portion 21B. At this time, the first conductor 20A is wound around the second tooth 13B in a counterclockwise direction when viewed from the radial outside. That is, the first conductor 20A is routed through the second slot 14B from one axial side S1 to the other axial side S2, and through the third slot 14C from the other axial side S2 to one axial side S1.

[0072] The first conducting wire 20A is then drawn out to the other axial side S2 of the second slot 14B, wired circumferentially around the other axial side S2 of the stator core 11, and inserted into the eleventh slot 14K. The first conducting wire 20A drawn out from the one axial side S1 of the eleventh slot 14K is then wired circumferentially around the one axial side S1 of the stator core 11, inserted into the ninth slot 14I, and drawn out from the ninth slot 14I to the other axial side S2.

[0073] The portion of first conducting wire 20A that is routed circumferentially around stator core 11, inserted into ninth slot 14I, and pulled out from ninth slot 14I to other axial side S2 is crossover portion 22. Before crossover portion 22 of first conducting wire 20A is routed, first winding portion 21A, twelfth winding portion 21L, eleventh winding portion 21K, tenth winding portion 21J, and ninth winding portion 21I are formed on first tooth 13A, twelfth tooth 13L, eleventh tooth 13K, tenth tooth 13J, and ninth tooth 13I, respectively. This suppresses a decrease in the space factor of first winding portion 21A, twelfth winding portion 21L, eleventh winding portion 21K, tenth winding portion 21J, and ninth winding portion 21I.

[0074] 2 and 3 , the crossover wire portions 22 are disposed between the radially outer ends and radially inner ends of the first tooth 13A, the twelfth tooth 13L, the eleventh tooth 13K, the tenth tooth 13J, and the ninth tooth 13I. By disposing the crossover wire portions 22 in this manner, interference between the crossover wire portions 22 and the stator mounting portion 521 of the mounting portion 52 is suppressed. This improves the workability of mounting the stator 10 to the stator mounting portion 521. Furthermore, interference between the crossover wire portions 22 and the rotor 30 is suppressed. This suppresses vibration and noise when the motor 100 is running.

[0075] The first conducting wire 20A forms a first winding portion 21A and a second winding portion 21B, and one of the end edges 23 is drawn out from the first slot 14A to the other axial side S2, and the other is drawn out from the ninth slot 14I to the other axial side S2. The end edge 23 of the first conducting wire 20A drawn out from the ninth slot 14I is a seventh drawn-out portion 24G, and the end edge 23 drawn out from the first slot 14A is a third processed wire portion 25C.

[0076] Finally, the fourth conductor 20D is routed through the stator core 11 to form the second V-phase winding pair V2. As shown in FIG. 10 , the fourth conductor 20D forms an eighth lead-out portion 24H, a third winding portion 21C, a fourth winding portion 21D, and a fourth processed winding portion 25D. The eighth lead-out portion 24H is routed out of the ninth slot 14I. Meanwhile, a portion of the third winding portion 21C is disposed in the fourth slot 14D and the fifth slot 14E. Therefore, the fourth conductor 20D forms a crossover portion 22 that connects the eighth lead-out portion 24H and the third winding portion 21C. In the fourth conductor 20D, the crossover portion 22 is routed to the other axial side S2 of the fourth tooth 13D, the fifth tooth 13E, and the sixth tooth 13F. The crossover wire portion 22 is routed through the seventh slot 14G from the other axial side S2 to the one axial side S1. Furthermore, the crossover wire portion 22 is routed to the one axial side S1 of the seventh tooth 13G and the eighth tooth 13H, and is routed so as to penetrate the ninth slot 14I from the one axial side S1 to the other axial side S2.

[0077] The winding process using the fourth conductor 20D will be described. The fourth conductor 20D is inserted into the fifth slot 14E from the other axial side S2 and wound around the fourth tooth 13D to form the fourth winding portion 21D. At this time, the fourth conductor 20D is wound around the fourth tooth 13D in a counterclockwise direction when viewed from the radial outside. That is, the fourth conductor 20D is routed through the fifth slot 14E from the other axial side S2 to the one axial side S1, and through the fourth slot 14D from the one axial side S1 to the other axial side S2.

[0078] After the fourth winding portion 21D is completed, the fourth conducting wire 20D is pulled out from the other axial side S2 of the fourth slot 14D, passes through the other axial side S2 of the third tooth 13C, and is routed from the other axial side S2 of the third slot 14C to the one axial side S1. The portion of the fourth conducting wire 20D that connects from the other axial side S2 of the fourth slot 14D to the other axial side S2 of the third slot 14C is a connecting wire portion 27. The connecting wire portion 27 constitutes a part of the third winding portion 21C.

[0079] The fourth conductor 20D is wound around the third tooth 13C to form a third winding portion 21C. At this time, the fourth conductor 20D is wound around the third tooth 13C in a clockwise direction when viewed from the radial outside. That is, the fourth conductor 20D is routed through the fourth slot 14D from one axial side S1 to the other axial side S2, and through the third slot 14C from the other axial side S2 to one axial side S1.

[0080] The fourth conducting wire 20D is then drawn out to the other axial side S2 of the third slot 14C, wired circumferentially around the other axial side S2 of the stator core 11, and inserted into the seventh slot 14G. The fourth conducting wire 20D drawn out from the one axial side S1 of the seventh slot 14G is then wired circumferentially around the one axial side S1 of the stator core 11, inserted into the ninth slot 14I, and drawn out from the ninth slot 14I to the other axial side S2.

[0081] The portion of the fourth conducting wire 20D that is routed circumferentially around the stator core 11, inserted into the ninth slot 14I, and drawn out from the ninth slot 14I to the other axial side S2 is the crossover portion 22. Before the crossover portion 22 of the fourth conducting wire 20D is routed, the fourth winding portion 21D, the fifth winding portion 21E, the sixth winding portion 21F, the seventh winding portion 21G, the eighth winding portion 21H, and the ninth tooth 13I that are adjacent to the crossover portion 22 are respectively formed with the fourth winding portion 21D, the fifth winding portion 21E, the sixth winding portion 21F, the seventh winding portion 21G, the eighth winding portion 21H, and the ninth winding portion 21I. Therefore, a decrease in the space factor of the fourth winding portion 21D, the fifth winding portion 21E, the sixth winding portion 21F, the seventh winding portion 21G, the eighth winding portion 21H, and the ninth winding portion 21I is suppressed.

[0082] 2 and 3 , the crossover wire portions 22 are disposed between the radially outer ends and radially inner ends of the fourth tooth 13D, the fifth tooth 13E, the sixth tooth 13F, the seventh tooth 13G, the eighth tooth 13H, and the ninth tooth 13I. By disposing the crossover wire portions 22 in this manner, interference between the crossover wire portions 22 and the stator mounting portion 521 of the mounting portion 52 is suppressed. This improves the workability of mounting the stator 10 to the stator mounting portion 521. Furthermore, interference between the crossover wire portions 22 and the rotor 30 is suppressed. This suppresses vibration and noise when the motor 100 is running.

[0083] The fourth conducting wire 20D forms the third winding portion 21C and the fourth winding portion 21D, and one of the end edges 23 is drawn out from the fifth slot 14E to the other axial side S2, and the other is drawn out from the ninth slot 14I to the other axial side S2. The end edge 23 of the fourth conducting wire 20D drawn out from the ninth slot 14I is the eighth drawn-out wire portion 24H, and the end edge 23 drawn out from the fifth slot 14E is the fourth processed wire portion 25D.

[0084] The above is the winding process in which the first conducting wire 20A to the sixth conducting wire 20F are attached to the stator core 11, that is, the first conducting wire 20A to the sixth conducting wire 20F are wound around the teeth 13 of the stator core 11. In the winding process, the first conducting wire 20A to the sixth conducting wire 20F may be wound using a winding device or may be wound manually.

[0085] Next, a wiring process is carried out to process the edge portions 23 of the first through sixth conducting wires 20A through 20F. Specifically, in the wiring process, the first through fourth processed wire portions 25A through 25D are routed in the circumferential direction and connected to the corresponding lead wire portions 24B, 24C, 24E, and 24F. The lead wire portions and processed wire portions are then soldered to form the first soldered portion 26A, the second soldered portion 26B, and the third soldered portion 26C.

[0086] The end edges 23 of the second conducting wire 20B are the third lead-out portion 24C and the fourth lead-out portion 24D, and the end edges 23 of the third conducting wire 20C are the first lead-out portion 24A and the second lead-out portion 24B. Therefore, wiring processing of the processed wire portion 25 is not required for the second conducting wire 20B and the third conducting wire 20C.

[0087] As shown in Figures 3 and 11, the first treated wire portion 25A drawn from the first slot 14A of the fifth conductor 20E constituting the first W-phase winding pair W1 is routed in the circumferential direction. The first treated wire portion 25A is routed in the circumferential direction through the other axial sides S2 of the twelfth tooth 13L, the eleventh tooth 13K, the tenth tooth 13J, the ninth tooth 13I, and the eighth tooth 13H. In this case, the first treated wire portion 25A is routed between the radially outer end and the radially inner end of each tooth 13. At least a portion of the treated wire portion 25A is positioned to overlap the tooth 13 in the axial direction.

[0088] The first processed line portion 25A is wired radially outside the second lead-out line portion 24B and the fifth lead-out line portion 24E drawn out from the tenth slot 14J, and the first lead-out line portion 24A, the fourth lead-out line portion 24D, the seventh lead-out line portion 24G and the eighth lead-out line portion 24H drawn out from the ninth slot 14I.

[0089] Arranging the first processed wire portion 25A in this manner reduces interference between the first processed wire portion 25A and the stator mounting portion 521 of the mounting portion 52. This improves the workability of mounting the stator 10 to the stator mounting portion 521. In addition, interference between the first processed wire portion 25A and the rotor 30 is reduced. This reduces vibration and noise when the motor 100 is driven.

[0090] 3 and 12, the third processed wire portion 25C, which is drawn out from the first slot 14A of the first conductor 20A constituting the first U-phase winding pair U1, is routed in the circumferential direction in the same manner as the first processed wire portion 25A.

[0091] Arranging the third processed wire portion 25C in this manner reduces interference between the third processed wire portion 25C and the stator mounting portion 521 of the mounting portion 52. This improves the workability of mounting the stator 10 to the stator mounting portion 521. In addition, interference between the third processed wire portion 25C and the rotor 30 is reduced. This reduces vibration and noise when the motor 100 is driven.

[0092] As shown in Figures 3 and 13, the second treated wire portion 25B drawn from the fifth slot 14E of the sixth conductor 20F constituting the second W-phase winding pair W2 is routed in the circumferential direction. The second treated wire portion 25B is routed in the circumferential direction through the other axial sides S2 of the fifth tooth 13E, sixth tooth 13F, seventh tooth 13G, eighth tooth 13H, and ninth tooth 13I. In this case, the second treated wire portion 25B is routed between the radially outer end and the radially inner end of each tooth 13. At least a portion of the treated wire portion 25B is positioned to overlap the tooth 13 in the axial direction.

[0093] The second processed line portion 25B is wired radially outside the third lead-out line portion 24C and the sixth lead-out line portion 24F drawn out from the eighth slot 14H, and the first lead-out line portion 24A, the fourth lead-out line portion 24D, the seventh lead-out line portion 24G and the eighth lead-out line portion 24H drawn out from the ninth slot 14I.

[0094] Arranging the second processed wire portion 25B in this manner suppresses interference between the second processed wire portion 25B and the stator mounting portion 521 of the mounting portion 52. This improves the workability of mounting the stator 10 to the stator mounting portion 521. In addition, interference between the second processed wire portion 25B and the rotor 30 is suppressed. This suppresses vibration and noise when the motor 100 is driven.

[0095] 3 and 14, the fourth processed wire portion 25D, which is drawn out from the fifth slot 14E of the third conductor 20C constituting the second V-phase winding pair V2, is routed in the circumferential direction in the same manner as the second processed wire portion 25B.

[0096] Arranging the fourth processed wire portion 25D in this manner reduces interference between the fourth processed wire portion 25D and the stator mounting portion 521 of the mounting portion 52. This improves the workability of mounting the stator 10 to the stator mounting portion 521. In addition, interference between the fourth processed wire portion 25D and the rotor 30 is reduced. This reduces vibration and noise when the motor 100 is driven.

[0097] When the first to fourth processed wire portions 25A to 25D are wired in the circumferential direction of the stator core 11, a winding portion 21 is formed on each tooth 13 of the stator core 11. Therefore, even if the first to fourth processed wire portions 25A to 25D are wired in the circumferential direction, this does not affect the space factor of the winding portion 21 formed on each tooth 13. In other words, even if the first to fourth processed wire portions 25A to 25D are wired in the circumferential direction, the space factor of the winding portion 21 does not decrease.

[0098] The third lead-out portion 24C and the sixth lead-out portion 24F drawn out from the eighth slot 14H are then soldered together with the first lead-out portion 24A and the third lead-out portion 24C, which are wired in the circumferential direction, to form the first soldering portion 26A.

[0099] Additionally, the first lead-out portion 24A, the fourth lead-out portion 24D, the seventh lead-out portion 24G, and the eighth lead-out portion 24H drawn out from the ninth slot 14I are soldered together to form the second soldering portion 26B.

[0100] Furthermore, the second lead-out portion 24B and the fifth lead-out portion 24E drawn out from the tenth slot 14J and the second lead-out portion 24B and the fourth lead-out portion 24D wired in the circumferential direction are soldered together to form a third soldering portion 26C.

[0101] The wiring process is carried out in the above-described manner. Each soldering portion 26 is formed by gathering together the four end edges 23 of the conductor 20. By forming the soldering portions 26, the winding portion 21 is delta-connected as shown in FIG. 4 .

[0102] Here, the soldered portion 26 will be described in detail. Fig. 15 is a side view of the stator 10. Fig. 15 illustrates the soldered portion 26 extending from the other axial side S2 of the stator 10 to the other axial side S2.

[0103] The soldering portion 26 has a soldering portion 261 and a boundary portion 262. The soldering portion 261 is formed by removing the coating from the tip of the lead-out portion 24 and the processed wire portion 25, exposing the core wire. The soldering portion 261 is the area to be soldered. In other words, the soldering portion 261 is an uninsulated portion of the conductor 20.

[0104] The boundary portion 262 is a region adjacent to one axial side S1 of the solder lifting portion 261. The boundary portion 262 is a region that allows solder to adhere. Like the solder lifting portion 261, the boundary portion 262 may have a non-insulated portion.

[0105] 15 , in the soldering portion 26, the boundary portion 262 is located on the other axial side S2 of the processed wire portion 25 that is circumferentially wired. In other words, the boundary of the soldering portion 26 is located at a position farther away from the tooth 13 in the axial direction than the processed wire portion 25 that is circumferentially wired. With this configuration, the soldering portion 26 is located at a position farther away from the tooth 13 in the axial direction than the processed wire portion 25. This ensures insulation between the soldering portion 26 and the winding portion 21.

[0106] According to the stator 10 of the present embodiment described above, the crossover portion 22 and the edge portion 23 are not disposed closer to the teeth 13 than the winding portion 21. This increases the space factor of the winding portion 21. This increases the efficiency and output of the motor 100 using the stator 10 without increasing the size.

[0107] <Use> An example of a use of the motor 100 having the stator 10 described above is an air vehicle 70 called a drone. The air vehicle 70 using the motor 100 will be described below with reference to the drawings. FIG. 16 is a plan view showing an example of the air vehicle 70. As shown in FIG. 16, the air vehicle 70 has a main body 71, four motors 100, four propellers 72 connected to the motors 100, a battery 73, and a controller 74.

[0108] The flying object 70 floats due to lift generated by the rotation of the four propellers 72. Furthermore, by controlling the rotation speed and orientation of the four propellers 72, attitude control can be performed, and the direction and speed of movement can be controlled. The controller 74 is connected to the battery 73, and supplies current output from the battery 73 to each motor 100. The controller 74 can independently control the current supplied to each of the four motors 100. By configuring the controller 74 in this way, the current supplied to each motor 100 is adjusted, and the rotation speed of the motor 100 is controlled.

[0109] As described above, the stator 10 shown in this embodiment has a high space factor of the winding portion 21, and the motor 100 using this stator 10 has high output relative to its size. Therefore, it is suitable as a power source for the flying object 70, which has strict weight restrictions.

[0110] Various modifications can be made to the various technical features disclosed in this specification without departing from the spirit of the technical creation. Furthermore, multiple embodiments and modifications shown in this specification can be combined to the extent possible.

[0111] <Summary> The present invention has the following configuration.

[0112] (1) A stator comprising: an annular core back extending in an axial direction extending vertically; a plurality of teeth extending radially from the core back and arranged side by side in the circumferential direction; slots formed between the teeth; and a plurality of conductors, portions of which are wound around the teeth while being insulated from the teeth, wherein each of the conductors has a plurality of winding portions wound around the teeth and edge portions at both ends of the conductor that are drawn out in the axial direction from the slot, wherein the slot into which the edge portions are drawn is different from the slot into which a portion of the winding portion is arranged, and the conductors have crossover portions that connect the winding portions to the edge portions, and at least a portion of the crossover portions and the edge portions are arranged in positions that overlap the teeth in the axial direction, and the winding portions are arranged between the crossover portions and the edge portions and the teeth.

[0113] (2) A stator as described in (1), in which the crossover portion and the portion of the end edge portion pulled out from the slot to one side in the axial direction are arranged between the radial inner end and the radial outer end of the tooth.

[0114] (3) The stator according to (1) or (2), wherein all of the end edge portions are drawn out in the same axial direction.

[0115] (4) A stator described in any one of (1) to (3), wherein the edge portion has: a plurality of lead-out wire portions drawn out from the slots; and a plurality of processed wire portions drawn out from slots circumferentially spaced from the slots from which the lead-out wire portions are drawn, the length of the drawn-out portions being longer than the lead-out wire portions; the plurality of processed wire portions are wired circumferentially and connected to selected ones of the plurality of lead-out wire portions; and the processed wire portions are arranged radially outward of the lead-out wire portions.

[0116] (5) The stator according to (4), wherein the lead wire portions are drawn out from three slots adjacent to each other in the circumferential direction.

[0117] (6) The stator according to (4) or (5), wherein the lead-out position of the processed wire portion is radially outward of the lead-out position of the lead-out wire portion.

[0118] (7) A stator according to any one of (4) to (6), wherein the lead-out wire portion and the processed wire portion have soldering portions to be soldered, and the boundary of the soldering portions is located at a position farther from the teeth in the axial direction than the processed wire portions that are wired circumferentially.

[0119] (8) A motor having a stator according to any one of (1) to (7) and a rotor that is radially opposed to the end of the teeth of the stator on the opposite side from the core back in the radial direction and rotates in a circumferential direction relative to the stator.

[0120] (9) A flying object having the motor according to (8) and an impeller rotated by the rotation of the rotor of the motor.

[0121] (10) A method for manufacturing a stator, comprising: a winding step of forming a winding portion by winding a conductor around a plurality of teeth that extend radially from an annular core back that extends along an axial direction extending vertically and are arranged side by side in the circumferential direction, and drawing the edge portions in the axial direction from slots formed between the teeth; and a wiring step of connecting parts of the edge portions to corresponding edge portions of the remaining edge portions, wherein, in the winding step, if the slot from which the edge portion is drawn is different from the slot in which part of the winding portion is arranged, a crossover part is formed that connects the winding portion to the edge portion, and at least parts of the crossover part and the edge portions are arranged in positions that overlap with the teeth in the axial direction, and the winding portion is formed so as to be arranged between the crossover part and the edge portions and the teeth.

[0122] 100 Motor 10 Stator 11 Stator core 12 Core back 13, 13A to 13L Teeth (1st tooth to 12th tooth) 14, 14A to 14L Slots (1st slot to 12th slot) 20, 20A to 20F Conductor (1st conductor to 6th conductor) 21, 21A to 21L Winding section (1st winding section to 12th winding section) 21U U-phase winding section 21V V-phase winding section 21W W-phase winding section 22 Crossover section 23 Edge section 24, 24A to 24H Lead section (1st lead section to 8th lead section) 25, 25A to 25D Processed wire section (1st process wire section to 4th lead section) 26, 26A to 26C DESCRIPTION OF THE SYMBOLS Soldered portion (first soldered portion to third soldered portion) 27 Connecting wire portion 30 Rotor 31 Rotor core 311 Rotor top plate portion 312 Rotor cylinder portion 313 Inner peripheral surface 32 Magnet 321 Inner peripheral surface 40 Shaft 50 Bracket 51 Base portion 52 Mounting portion 521 Stator mounting portion 522 Board mounting portion 523 Shaft support hole 53, 54 Bearing 60 Circuit board 61 Fixing hole 70 Aircraft 71 Main body 72 Propeller 73 Battery 74 Controller S1 One axial side S2 Other axial side U1 First U-phase winding pair U2 Second U-phase winding pair V1 First V-phase winding pair V2 Second V-phase winding pair W1 First W-phase winding pair W2 Second W-phase winding pair

Claims

1. A stator comprising: an annular core back extending in an axial direction extending vertically; a plurality of teeth extending radially from the core back and arranged in a circumferential direction; slots formed between the teeth; and a plurality of conductors, portions of which are wound around the teeth while being insulated from the teeth, wherein each of the conductors has a plurality of winding portions wound around the teeth and edge portions at both ends of the conductor which are drawn out in the axial direction from the slot, wherein the slot into which the edge portions are drawn is different from the slot in which a portion of the winding portion is arranged, and the conductors have crossover portions connecting the winding portions to the edge portions, wherein at least a portion of the crossover portions and the edge portions are arranged in positions which axially overlap the teeth, and the winding portions are arranged between the crossover portions and the edge portions and the teeth.

2. A stator as described in claim 1, wherein the crossover portion and the portion of the end edge portion pulled out from the slot to one side in the axial direction are positioned between the radial inner end and the radial outer end of the tooth.

3. A stator according to claim 1, wherein all of said end edge portions are drawn out in the same axial direction.

4. A stator as described in claim 1, wherein the edge portion has a plurality of lead-out wire portions drawn out from the slots, and a plurality of processed wire portions drawn out from slots circumferentially spaced from the slots from which the lead-out wire portions are drawn, the length of the drawn-out portions being longer than the lead-out wire portions, and the plurality of processed wire portions are connected to selected ones of the plurality of lead-out wire portions, and the processed wire portions are arranged radially outward of the lead-out wire portions.

5. A stator according to claim 4, wherein the edge portion has three of the lead wire portions, and the three lead wire portions are drawn out from three slots adjacent to each other in the circumferential direction.

6. A stator according to claim 4, wherein the lead-out position of the processed wire portion is radially outward of the lead-out position of the lead-out wire portion.

7. A stator as set forth in claim 4, wherein a plurality of the edge portions are connected to form soldered portions, and the boundaries of the soldered portions are located farther from the teeth in the axial direction than the processed wire portions that are wired circumferentially.

8. A motor comprising: a stator according to any one of claims 1 to 7; and a rotor that faces radially the ends of the teeth of the stator opposite the core back in the radial direction and rotates in the circumferential direction relative to the stator.

9. A flying vehicle comprising: the motor according to claim 8; and an impeller rotated by rotation of the rotor of the motor.

10. A method for manufacturing a stator, comprising: a winding process in which a winding portion is formed by winding a conductor around a plurality of teeth that extend radially from an annular core back that extends along an axial direction extending vertically and are arranged side by side in the circumferential direction, and edge portions that are both ends of the conductor are pulled out in the axial direction from slots formed between the teeth; and a wiring process in which a portion of the edge portions is connected to a corresponding edge portion of the remaining edge portions, wherein, in the winding process, if the slot from which the edge portion is pulled out is different from the slot in which a portion of the winding portion is arranged, a crossover portion is formed that connects the winding portion to the edge portion, and at least a portion of the crossover portion and the edge portion are arranged in a position that overlaps with the tooth in the axial direction, and the winding portion is formed so that it is arranged between the crossover portion and the edge portion and the tooth.

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