motor

Abstract

To achieve higher space occupation of winding.SOLUTION: A motor includes a plurality of coils and a conductive member. The plurality of coils are each formed of a lead wire having two ends. One end of the two ends of the lead wire forms an inner peripheral part of the coil, and the other end forms an outer peripheral part of the coil. The inner peripheral parts of adjacent two coils among the plurality of coils are electrically connected with the conductive member interposed therebetween.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a motor.

Background Art

[0002] For example, motors mounted on vehicles are required to be miniaturized and have high output due to the increasing number and large capacity of the mounted devices. In order to realize a motor that is miniaturized and has high output, it is necessary to increase the space factor of the winding.

[0003] In order to realize a high space factor of the winding, a motor is known that has teeth with a wide portion and a narrow portion, and has a first coil wound around the wide portion and a second coil wound around the narrow portion (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the technology described in Patent Document 1 has room for further improvement from the viewpoint of increasing the space factor of the winding.

[0006] The present invention has been made in view of the above, and an object thereof is to provide a motor capable of increasing the space factor of the winding.

Means for Solving the Problems

[0007] In order to solve the above-described problems and achieve the object, a motor according to the present invention includes a plurality of coils and a conductive member. Each of the plurality of coils is formed of a conductive wire having two ends. Of the two ends of the conductive wire, one end forms an inner peripheral portion of the coil, and the other end forms an outer peripheral portion of the coil.The conductive member penetrates the holes at one end of two adjacent coils among the multiple coils. before Ki-rin Two coils in contact one end The parts are electrically connected via the conductive member.

[0008] According to one embodiment of the motor of the present invention, the conductor can be made to occupy a large area. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a plan view of the motor according to the embodiment. [Figure 2] Figure 2 is a perspective view of the stator of the motor shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view in a plane perpendicular to the axial direction of the stator shown in Figure 2. [Figure 4] Figure 4 is a front view of the first coil of the motor shown in Figure 1. [Figure 5] Figure 5 is a front view of the second coil of the motor shown in Figure 1. [Figure 6] Figure 6 is a front view of the third coil of the motor shown in Figure 1. [Figure 7] Figure 7 is a front view of the fourth coil of the motor shown in Figure 1. [Figure 8] Figure 8 is a perspective view showing the assembly of the first, second, third, and fourth coils. [Modes for carrying out the invention]

[0010] The motor according to the embodiment will be described in detail below based on the drawings. Note that the dimensional relationships and ratios of the elements in the drawings may differ from reality. There may also be differences in dimensional relationships and ratios between elements within the drawings themselves.

[0011] [Embodiment] Figure 1 is a plan view of the motor 1 according to the embodiment. Figure 2 is a perspective view of the stator 4 of the motor 1 shown in Figure 1. Figure 3 is a cross-sectional view of the stator 4 shown in Figure 2 in a plane perpendicular to the axial direction A. Note that in Figures 2 and 3, the rotor 3 is omitted for the sake of explanation. Also, in Figure 3, some of the coil groups 44 of the multiple coil groups 44 are omitted for the sake of explanation.

[0012] In the description of the motor 1 shown in Figures 1 to 7 according to the following embodiment, in order to facilitate understanding of direction, the direction in which the shaft 2 (described later) extends will be referred to as the axial direction A, and the direction in which the rotor 3 (described later) rotates will be referred to as the circumferential direction C. Furthermore, the direction that is included in the plane perpendicular to the axial direction A, passes through the axis 2o of the shaft 2, and is perpendicular to the circumferential direction C will be referred to as the radial direction R. In addition, the direction perpendicular to the axial direction A and the radial direction R will be referred to as the width direction X.

[0013] The motor 1 shown in Figure 1 according to this embodiment is an inner rotor type in which, when viewed from the axial direction A, the stator 4 is located outside the rotor 3 in the radial direction R, while the shaft 2 is located inside the rotor 3 in the radial direction R. The motor 1 according to this embodiment is, for example, a three-phase motor (DC motor) that is electrically connected to a three-phase AC power supply.

[0014] The motor 1 according to this embodiment is an electric motor that converts electrical energy from a power source, for example, into a driving force that rotates the shaft 2 in the circumferential direction C. The motor 1 is housed in a frame, for example, not shown.

[0015] Motor 1 comprises, for example, a shaft 2, a rotor 3, and a stator 4. The shaft 2 is a so-called rotating shaft, and is formed, for example, from a metal member in a cylindrical or cylindrical shape extending along the axial direction A. The shaft 2 has an axis 2o and is rotatably mounted about the axis 2o. The shaft 2 transmits power to the outside by rotating in the circumferential direction C.

[0016] The rotor 3 is provided so as to be rotatable about the axis 2o of the shaft 2. The rotor 3 according to the present embodiment is arranged to face the stator 4 in the radial direction R and is fixed to the shaft 2, for example. Further, the motor 1 according to the present embodiment integrally forms the shaft 2 and the rotor 3.

[0017] The rotor 3 is arranged inside the stator 4 in the radial direction R, for example. That is, the motor 1 is an inner rotor type brushless motor in which the rotor 3 is located inside the stator 4 in the radial direction R.

[0018] The rotor 3 has a yoke 31 and a magnet 32. The yoke 31 is formed of a magnetic material such as iron, for example.

[0019] The magnet 32 is constituted by a permanent magnet, for example. The rotor 3 according to the present embodiment has eight magnets 32, for example.

[0020] The stator 4 is a portion that generates a force for rotating the rotor 3 in the circumferential direction C. As shown in FIG. 3, the stator 4 includes, for example, one core 41, a plurality of spokes 42, a plurality of insulators 43, and a plurality of coil groups 44.

[0021] The core 41 is formed by laminating plate-like metal members such as silicon steel sheets, electromagnetic steel sheets, and soft magnetic steel sheets in the axial direction A and has magnetism. As shown in FIGS. 2 and 3, the core 41 is formed in an annular shape when viewed from the axial direction A. Therefore, an accommodation space 41s for accommodating a plurality of coil groups 44 is formed inside the core 41 in the radial direction R according to the present embodiment, as shown in FIG. 3. Further, the stator 4 according to the present embodiment is formed by separately forming the core 41 and the spokes 42.

[0022] The spokes 42 are what are known as teeth. Each spoke 42 is formed to protrude radially inward (towards the rotor 3) from the inner circumferential surface of the core 41, as shown in Figure 3. Furthermore, each spoke 42 has a constant length 42W in the width direction X, which is perpendicular to the axial direction A and the radial direction R. In other words, each spoke 42 has the same length 42W1 in the inner width direction X in the radial direction R and the same length 42W2 in the outer width direction X in the radial direction R. Although not shown in the figure, each spoke 42 also has a constant length in the axial direction A.

[0023] The spokes 42 pass inside the coil group 44 in the radial direction R. Since each coil group 44 is formed by multiple coils 440, the spokes 42 pass inside each of the multiple coils 440 in the radial direction R. The stator 4 according to this embodiment comprises, for example, 12 spokes 42.

[0024] The insulator 43 is formed of, for example, an insulating resin and is attached to the surface of the spoke 42 to ensure insulation between the spoke 42 and the coil group 44. The stator 4 according to this embodiment includes, for example, 12 insulators 43.

[0025] The multiple coil groups 44 are arranged, for example, along the circumferential direction C. The motor 1 according to this embodiment comprises, for example, 12 coil groups 44. Each of the coil groups 44 comprises, for example, multiple coils 440 and a conductive member 445. In other words, the motor 1 comprises multiple coils 440 and a conductive member 445. The multiple coils 440 according to this embodiment are composed of, for example, a first coil 441, a second coil 442, a third coil 443, and a fourth coil 444.

[0026] Next, the first coil 441 will be described with reference to Figure 4. Figure 4 is a front view of the first coil 441 provided in the motor 1 shown in Figure 1. The first coil 441 is formed by a conductor 44c having two ends 44a and 44b.

[0027] The conductor 44c is a so-called winding, made of a conductive metal (for example, copper, copper alloy, etc.), and is integrally formed such that one end 44a and the other end 44b are continuous. Furthermore, the conductor 44c in this embodiment is, for example, a flat wire whose cross-sectional shape in a plane perpendicular to the longitudinal direction is rectangular. The conductor 44c is wound around the spoke 42 shown in Figure 3 multiple times (four times in this embodiment). In the first coil 441 of this embodiment, when viewed from the inside to the outside in the radial direction R, the conductor 44c is wound clockwise around the spoke 42. As the conductor 44c is wound around the spoke 42, an inner circumference 44i is formed through which the spoke 42 passes, and the inner circumference 44i becomes the inside of the first coil 441, while the outer circumference 44o is formed on the opposite side, the outside.

[0028] The conductor 44c has two ends 44a and 44b. One end 44a forms the inner circumference 44i of the first coil 441, and the other end 44b forms the outer circumference 44o of the first coil 441. The conductor 44c also has a plurality of first portions 44d extending in the axial direction A, and a plurality of second portions 44e extending in the width direction X.

[0029] The first portion 44d is formed, for example, by laser cutting a conductive metal plate such as copper. The second portion 44e is formed, for example, by laser cutting a conductive metal plate such as copper. The axial end 44d1 of the first portion 44d and the widthwise end 44e1 of the second portion 44e are electrically connected, for example, by laser welding along the radial direction R.

[0030] When the axial end 44d1 of the first part 44d and the widthwise end 44e1 of the second part 44e are connected by laser welding, the corners can be made relatively small, and the space occupied by the conductors 44c located in the accommodation space 41s can be improved. The corners may also be formed by the intersection of the axial end 44d1 of the first part 44d and the widthwise end 44e1 of the second part 44e.

[0031] The inner circumference 44i of the first coil 441 is formed by a pair of first portions 44d facing each other in the width direction X and a pair of second portions 44e facing each other in the axial direction A. The pair of first portions 44d facing each other in the width direction X are positioned closest to the spokes 42 in the width direction X. The pair of second portions 44e facing each other in the axial direction A are positioned closest to the spokes 42 in the axial direction A. Of the pair of second portions 44e forming the inner circumference 44i, the second portion 44e located at the tip has a hole 44f that penetrates it radially R and through which a conductive member 445 is inserted. Then, one end 44a of the first coil 441 and one end 44a of the second coil 442 are electrically connected via the conductive member 445.

[0032] A first space 441s is formed in the inner circumference 44i of the first coil 441, through which the spoke 42 passes in the radial direction R. The first space 441s has an axial length A of L11 and a width X of W11.

[0033] The outer periphery 44o of the first coil 441 is formed by a pair of first portions 44d that are located furthest from the spokes 42 in the width direction X and are opposite each other in the width direction X, and a pair of second portions 44e that are located furthest from the spokes 42 in the axial direction A and are opposite each other in the axial direction A. Of the pair of first portions 44d that form the outer periphery 44o, the first portion 44d located at the tip constitutes the other end portion 44b described above. The other end portion 44b is electrically connected to the fourth coil 444 of the other coil group 44, for example, via a busbar (not shown). The other end portion 44b extends from the portion wound around the spokes 42 to one side in the axial direction A, along the axial direction A.

[0034] As shown in Figures 1 and 3, the first coil 441 is positioned adjacent to the second coil 442 in the radial direction R, and is located at the innermost position in the radial direction R among the multiple coils 440.

[0035] Next, the second coil 442 will be explained using Figure 5. Figure 5 is a front view of the second coil 442 provided in the motor 1 shown in Figure 1. In the configuration of the second coil 442, the same reference numerals are used for parts that are the same as those in the configuration of the first coil 441, and their explanation is omitted. The different parts will be explained below.

[0036] The conductor 44c of the second coil 442 is formed by winding it multiple times (five times in this embodiment) around the spoke 42 shown in Figure 3. In this embodiment, when viewed from the inside to the outside in the radial direction R, the conductor 44c of the second coil 442 is wound counterclockwise around the spoke 42.

[0037] The other end 44b of the second coil 442 and the other end 44b of the third coil 443 are electrically connected, for example, by laser welding.

[0038] A second space 442s is formed in the inner circumference 44i of the second coil 442, through which the spoke 42 passes in the radial direction R. The second space 442s has an axial length A of L12 and a width direction X of W12. The axial length A of the second space 442s L12 is the same as the axial length A of the first space 441s L11, and the width direction X of the second space 442s W12 is the same as the width direction X of the first space 441s W11.

[0039] As shown in Figures 1 and 3, the second coil 442 is positioned adjacent to the first coil 441 and the third coil 443 in the radial direction R, and is positioned between the first coil 441 and the third coil 443 in the radial direction R.

[0040] Next, the third coil 443 will be explained using Figure 6. Figure 6 is a front view of the third coil 443 provided in the motor 1 shown in Figure 1. In the configuration of the third coil 443, the same reference numerals are used for parts that are the same as those in the configuration of the first coil 441, and their explanation is omitted. The different parts will be explained below.

[0041] The conductor 44c of the third coil 443 is formed by winding it multiple times (six times in this embodiment) around the spoke 42 shown in Figure 3. In this embodiment, when viewed from the inside to the outside in the radial direction R, the conductor 44c of the third coil 443 is wound clockwise around the spoke 42.

[0042] Furthermore, in the third coil 443, of the pair of second portions 44e that form the outer circumference 44o, the second portion 44e located at the tip forms the other end portion 44b. The other end portion 44b is L-shaped when viewed from the radial direction R.

[0043] A third space 443s is formed in the inner circumference 44i of the third coil 443, through which the spoke 42 passes in the radial direction R. The third space 443s has an axial length A of L13 and a width direction X of W13. The axial length A of the third space 443s L13 is the same as the axial length A of the first space 441s L11, and the width direction X of the third space 443s W13 is the same as the width direction X of the first space 441s W11.

[0044] As shown in Figures 1 and 3, the third coil 443 is positioned adjacent to the second coil 442 and the fourth coil 444 in the radial direction R, and is positioned between the second coil 442 and the fourth coil 444 in the radial direction R.

[0045] Then, one end 44a of the third coil 443 and one end 44a of the fourth coil 444 are electrically connected via the conductive member 445.

[0046] Next, the fourth coil 444 will be explained using Figure 7. Figure 7 is a front view of the fourth coil 444 provided in the motor 1 shown in Figure 1. In the configuration of the fourth coil 444, the same reference numerals are used for parts that are the same as those in the configuration of the first coil 441, and their explanation is omitted. The different parts will be explained below.

[0047] The conductor 44c of the fourth coil 444 is formed by winding it multiple times (six times in this embodiment) around the spoke 42 shown in Figure 3. In this embodiment, when viewed from the inside to the outside in the radial direction R, the conductor 44c of the second coil 442 is wound counterclockwise around the spoke 42.

[0048] A fourth space 444s is formed in the inner circumference 44i of the fourth coil 444, through which the spoke 42 passes in the radial direction R. The fourth space 444s has an axial length A of L14 and a width direction X of W14. The axial length A of the fourth space 444s L14 is the same as the axial length A of the first space 441s L11, and the width direction X of the fourth space 444s W14 is the same as the width direction X of the first space 441s W11.

[0049] As shown in Figures 1 and 3, the fourth coil 444 is positioned adjacent to the third coil 443 in the radial direction R, and is located on the outermost side of the multiple coils 440 in the radial direction R.

[0050] The other end 44b of the fourth coil 444 is electrically connected to an external device (e.g., an AC power supply) via, for example, a busbar (not shown).

[0051] The axial length A of the first coil 441, L1, is shorter than the axial length A of the second coil 442, shorter than the axial length A of the third coil 443, and shorter than the axial length A of the fourth coil 444, L4. Also, the widthwise length X of the first coil 441, W1, is shorter than the widthwise length X of the second coil 442, shorter than the widthwise length X of the third coil 443, and shorter than the widthwise length X of the fourth coil 444, W4.

[0052] The axial length A of the second coil 442, L2, is shorter than the axial length A of the third coil 443, L3, and also shorter than the axial length A of the fourth coil 444, L4. Furthermore, the widthwise length X of the second coil 442, W2, is shorter than the widthwise length X of the third coil 443, W3, and also shorter than the widthwise length X of the fourth coil 444, W4.

[0053] The axial length A of the third coil 443, L3, is longer than the axial length A of the fourth coil 444, due to the other end 44b which is formed in an L shape. Also, the widthwise length X of the third coil 443, W3, and the widthwise length X of the fourth coil 444, W4, are the same.

[0054] Therefore, the external dimensions of the first coil 441, the second coil 442, the third coil 443, and the fourth coil 444 in this embodiment are different from each other. In other words, the external dimensions of the multiple coils 440 are different from each other.

[0055] In the embodiments described above, the length W3 in the width direction X of the third coil 443 and the length W4 in the width direction X of the fourth coil 444 were described as being the same. However, the invention according to this embodiment is not limited to this. For example, the length W4 in the width direction X of the fourth coil 444 may be larger than the length W4 in the width direction X of the third coil 443. If multiple coils 440 are formed in this manner, the length W1 in the width direction X of the first coil 441, which is located furthest in the radial direction R, will be the shortest, and the lengths W2, W3, and W4 in the width direction X of the multiple coils 440 will gradually increase as you move outward in the radial direction R.

[0056] For example, the number of turns of the first coil 441, which is located furthest in the radial direction R, around the spoke 42 may be minimized, and the number of turns of the coils 440 around the spoke 42 may gradually increase as one moves outward in the radial direction R. If multiple coils 440 are formed in this way, the external dimensions of the multiple coils 440 will differ from each other in the axial direction A and the width direction X. In other words, the external dimensions of the multiple coils 440 will differ from each other in the circumferential direction C.

[0057] The length L11 in the axial direction A of the first space 441s, the length L12 in the axial direction A of the second space 442s, the length L13 in the axial direction A of the third space 443s, and the length L14 in the axial direction A of the fourth space 444s are the same. Furthermore, the length W11 in the width direction X of the first space 441s, the length W12 in the width direction X of the second space 442s, the length W13 in the width direction X of the third space 443s, and the length W14 in the width direction X of the fourth space 444s are the same. For these reasons, spokes 42 with a constant length in the width direction X and a constant length in the axial direction A can pass through the aforementioned spaces 441s, 442s, 443s, and 444s.

[0058] Furthermore, as described above, each of the multiple coils 440 is formed by a conductor 44c having two ends 44a and 44b. Of the two ends 44a and 44b of the conductor 44c, one end 44a forms the inner circumference 44i of the coil 440, and the other end 44b forms the outer circumference 44o of the coil 440.

[0059] The conductive member 445 is formed of a conductive metallic material such as copper. In this embodiment, the conductive member 445 is formed, for example, in a cylindrical shape and extends along the radial direction R. The conductive member 445 has one end 445a on the inside of the radial direction R and the other end 445b on the outside of the radial direction R (see Figure 8).

[0060] Next, the assembly of one coil group 44 will be explained using Figure 8. Figure 8 is a perspective view showing the assembly of the first coil 441, the second coil 442, the third coil 443, and the fourth coil 444.

[0061] First, the worker places the conductive member 445 between the first coil 441 and the second coil 442 in the radial direction R. Next, the worker inserts one end 445a of the conductive member 445 into the hole 44f formed in the inner circumference 44i of the first coil 441, and the other end 445b of the conductive member 445 into the hole 44f formed in the inner circumference 44i of the second coil 442.

[0062] Next, the worker electrically connects the inner periphery of the hole 44f of the first coil 441 to one end 445a of the conductive member 445, for example by welding, and electrically connects the inner periphery of the hole 44f of the second coil 442 to the other end 445b of the conductive member 445, for example by welding. As a result, the first coil 441 and the second coil 442 are electrically connected via the conductive member 445.

[0063] Next, the worker places the third coil 443 adjacent to the radially outer R of the second coil 442. Then, the worker electrically connects the other end 44b of the outer circumference 44o of the second coil 442 and the other end 44b of the outer circumference 44o of the third coil 443, for example, by welding.

[0064] Next, the worker places the conductive member 445 between the third coil 443 and the fourth coil 444 in the radial direction R. Then, the worker inserts one end 445a of the conductive member 445 into the hole 44f formed in the inner circumference 44i of the third coil 443, and the other end 445b of the conductive member 445 into the hole 44f formed in the inner circumference 44i of the fourth coil 444.

[0065] Next, the worker electrically connects the inner edge of the hole 44f of the third coil 443 to one end 445a of the conductive member 445, for example by welding, and electrically connects the inner edge of the hole 44f of the fourth coil 444 to the other end 445b of the conductive member 445, for example by welding. As a result, the third coil 443 and the fourth coil 444 are electrically connected via the conductive member 445.

[0066] Next, the worker applies electrodeposition coating to the first coil 441, second coil 442, third coil 443, and fourth coil 444 to form an insulating film on their surfaces. This completes the assembly of one coil group 44. The process is then repeated to assemble another coil group 44.

[0067] In the coil group 44 assembled as described above, the inner circumferences 44i of two adjacent coils 440 in the radial direction R are electrically connected via a conductive member 445, or the outer circumferences 44o of two adjacent coils 440 in the radial direction R are electrically connected by connecting their other ends 44b.

[0068] In other words, each of the coil group 44 according to this embodiment has alternating locations where two adjacent coils 440 in the radial direction R are electrically connected at the inner circumference 44i, and locations where two adjacent coils 440 in the radial direction R are electrically connected at the outer circumference 44o.

[0069] In the coil group 44 assembled as described above, the other end 44b of the first coil 441 becomes the input terminal, and the other end 44b of the fourth coil 444 becomes the output terminal. When a voltage is applied between the other end 44b of the first coil 441 and the other end 44b of the fourth coil 444, the current flows in the order of the first coil 441, the second coil 442, the third coil 443, and the fourth coil 444.

[0070] Furthermore, when viewed from the inside to the outside in the radial direction R, the first coil 441 winds the wire 44c around the spoke 42 in a clockwise direction, the second coil 442 winds the wire 44c around the spoke 42 in a counterclockwise direction, the third coil 443 winds the wire 44c around the spoke 42 in a clockwise direction, and the fourth coil 444 winds the wire 44c around the spoke 42 in a counterclockwise direction. In other words, in each of the coil group 44 according to this embodiment, in two adjacent coils 440 in the radial direction R, the direction in which the wire 44c is wound in one coil 440 is opposite to the direction in which the wire 44c is wound in the other coil 440. Therefore, the direction of the current flowing through the coil group 44 according to this embodiment is counterclockwise when viewed from the inside to the outside in the radial direction R for all of the first coil 441, second coil 442, third coil 443, and fourth coil 444.

[0071] As described above, the motor 1 according to this embodiment comprises a plurality of coils 440 and a conductive member 445. Furthermore, each of the plurality of coils 440 is formed by a conductor 44c having two ends 44a and 44b, with one end 44a forming the inner circumference 44i of the coil 440 and the other end 44b forming the outer circumference 44o of the coil 440, and the inner circumferences 44i of two adjacent coils 441 and 442 of the plurality of coils 440 are electrically connected via the conductive member 445.

[0072] In the motor 1 according to this embodiment, the external dimensions of the multiple coils 440 differ from one another in the width direction X (circumferential direction C). More specifically, the length W1 (length in the circumferential direction C) of the first coil 441, which is located furthest in the radial direction R, is the shortest, and the lengths W2, W3, W4 (lengths in the circumferential direction C) of the multiple coils 440 gradually increase as they move outward in the radial direction R. Therefore, in the motor 1 according to this embodiment, the length of the conductors 44c housed in the housing space 41s of the core 41 can be increased, and the gap in the housing space 41s can be reduced as much as possible. Consequently, in the motor 1 according to this embodiment, the conductors 44c can occupy a large area in the housing space 41s, thereby increasing the output power of the motor 1. In other words, if the number of times the conductor wire 44c is wound around the spoke 42 is set to be the same, the motor 1 according to this embodiment can shorten the length of the spoke 42 in the radial direction R compared to a motor in which the length of multiple coils 440 in the width direction X (circumferential direction C) is the same, and thus the size of the radial direction R can be reduced.

[0073] In this embodiment, the spoke 42 has the same length 42W1 in the inner width direction X in the radial direction R and the same length 42W2 in the outer width direction X in the radial direction R. Therefore, compared to a motor equipped with spokes having narrow and wide sections, the length of the wire 44c wound around the spoke 42 can be increased, thus increasing the space occupied by the wire 44c.

[0074] The plurality of coils 440 according to this embodiment comprises a first coil 441 and a second coil 442 adjacent in the radial direction R, and a third coil 443. The second coil 442 is located between the first coil 441 and the third coil 443. The other end 44b of the second coil 442 and the other end 44b of the third coil 443 are electrically connected.

[0075] The stator 4 according to this embodiment includes spokes 42 that pass inside a plurality of coils 440. The spokes 42 are made of a magnetic material.

[0076] In the motor 1 according to this embodiment, the other end 44b of one of the multiple coils 440 is electrically connected to an external device.

[0077] In the above-described embodiment, the coil group 44 was described as being composed of a first coil 441, a second coil 442, a third coil 443, and a fourth coil 444. However, the coil group 44 according to this embodiment is not limited to being composed of four coils 440. For example, the number of coils 440 constituting the coil group 44 can be set to any number of two, three, or five or more.

[0078] Furthermore, the stator 4 according to the above embodiment was described as having 12 spokes 42 and 12 coil groups 44. However, the number of spokes 42 and coil groups 44 according to this embodiment are not limited to these and can be set to any number.

[0079] Furthermore, the coil 440 according to the above embodiment was described in which the first portion 44d and the second portion 44e are electrically connected by welding using a laser. However, the present invention is not limited to this. For example, the first portion 44d and the second portion 44e may be connected by ultrasonic welding, or by welding such as fusing. Of course, the first portion 44d and the second portion 44e may be electrically connected by methods other than welding or welding.

[0080] Furthermore, the motor 1 described in the above-described embodiment is of the inner rotor type. However, the motor 1 according to this embodiment is not limited to that. For example, the motor 1 according to this embodiment can be applied to an outer rotor type in which the stator 4 is located inside the rotor 3 in the radial direction R when viewed from the axial direction A.

[0081] The above description is based on embodiments of the motor 1 according to the present invention, but it goes without saying that the present invention is not limited to these embodiments, and various modifications are possible without departing from the spirit of the invention. Combinations of the components of each of the embodiments described above are also included in the present invention. Various modifications that do not depart from the spirit of the invention are also included in the technical scope of the present invention, and this will be clear to those skilled in the art from the description of the claims. [Explanation of Symbols]

[0082] 1 Motor, 2 Shaft, 3 Rotor, 4 Stator, 42 Spoke, 44a End (one end), 44b End (the other end), 44c Wire (winding), 44i Inner circumference, 44o Outer circumference, 440 Coil, 441 First coil, 442 Second coil, 443 Third coil, 445 Conductive member, C Circumferential direction

Claims

1. Multiple coils, Conductive material and Equipped with, Each of the aforementioned coils is formed from a wire having two ends. Of the two ends of the aforementioned conductor, one end forms the inner circumference of the coil, and the other end forms the outer circumference of the coil. The conductive member penetrates the holes at one end of two adjacent coils among the multiple coils, One end of the two adjacent coils is electrically connected via the conductive member. Motor.

2. In the circumferential direction, the outer dimensions of the plurality of coils are different from each other. The motor according to claim 1.

3. The plurality of coils comprises a first coil and a second coil, which are two adjacent coils, and a third coil. The second coil is located between the first coil and the third coil. The other end of the second coil and the other end of the third coil are electrically connected. The motor according to claim 1 or 2.

4. Equipped with a stator, The stator comprises spokes that pass inside the plurality of coils, The spokes are made of a magnetic material. The motor according to claim 1 or 2.

5. Of the plurality of coils, the other end of one coil is electrically connected to an external device. The motor according to claim 1 or 2.

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