Motor

Abstract

To provide a motor with less iron losses, which can be easily manufactured.SOLUTION: An axial gap motor 100 includes: an upper rotor 120 and a lower rotor 121 fixed to a rotation shaft 110; and a stator 130 between the upper rotor 120 and the lower rotor 121, the stator facing each rotor with a space in between in the axial direction of the rotation shaft 110. The stator 130 has a wound core formed by winding an amorphous metal thin film or a nanocrystalline soft magnetic material thin film.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a motor, and more particularly to the structure of a motor core. [Background technology]

[0002] Conventionally, motor cores made of multiple laminated electromagnetic steel sheets have been known. Recently, in order to reduce iron loss, motors have been developed that use laminated thin sheets of amorphous metal or nanocrystalline soft magnetic material. For example, Patent Document 1 listed below discloses an axial gap motor with a stator in which trapezoidal amorphous metal foil strips are laminated in the axial direction of the rotating shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-068567 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while amorphous metals and materials known as nanocrystalline soft magnetic materials have the advantage of having lower iron loss than conventional electromagnetic steel sheets, they also have the following problems. First, they are harder than electromagnetic steel sheets, making them difficult to punch. Furthermore, they are thinner than electromagnetic steel sheets, requiring more sheets to be laminated. Furthermore, they are more brittle than electromagnetic steel sheets, making them difficult to handle. The axial gap motor described in Patent Document 1 uses a laminated structure, which requires a great deal of work to cut and then laminate many amorphous metal foil strips, making motor manufacturing difficult. These problems arise not only in axial gap motors, but also in radial gap motors, which use a laminated structure.

[0005] The present invention has been made to solve these technical problems, and an object of the present invention is to provide a motor that can be easily manufactured while reducing iron loss. [Means for solving the problem]

[0006] The motor according to the present invention is a motor comprising a stator around which a coil is wound, a rotor rotatably mounted relative to the stator, and a rotating shaft fixed to the rotor, wherein at least the stator has a wound core formed by winding a thin ribbon of amorphous metal or a thin ribbon of nanocrystalline soft magnetic material.

[0007] In the motor according to the present invention, at least the stator has a wound core, which is formed by winding a thin ribbon of amorphous metal or a thin ribbon of nanocrystalline soft magnetic material. Therefore, compared to conventional structures in which an amorphous metal foil strip is cut and laminated, the cutting and lamination processes are unnecessary, making the motor easier to manufacture. Furthermore, because the wound core is formed from an amorphous metal or a nanocrystalline soft magnetic material, iron loss can be reduced compared to conventional structures using electromagnetic steel sheets. As a result, the motor can be easily manufactured while reducing iron loss.

[0008] In the motor according to the present invention, the motor is preferably an axial gap motor, which makes it possible to easily manufacture the axial gap motor.

[0009] In the motor according to the present invention, the wound core is a wound body formed by winding the amorphous metal ribbon or the nanocrystalline soft magnetic material ribbon around the rotation shaft multiple times, and it is preferable that a plurality of symmetrical grooves are formed at both ends of the wound body in the axial direction of the rotation shaft, and the coil is wound in each groove. In this way, by winding the coil in the groove, deviation of the coil winding position can be prevented, making it easier to manufacture an axial gap motor.

[0010] In the motor according to the present invention, the motor is preferably a radial gap motor, which makes it possible to easily manufacture the radial gap motor.

[0011] Furthermore, in the motor according to the present invention, the wound core is preferably a cut core formed by cutting a wound body formed by winding a thin ribbon of the amorphous metal or the thin ribbon of the nanocrystalline soft magnetic material a plurality of times in a direction intersecting the circumferential direction, which makes it even easier to manufacture a radial gap motor. [Effects of the Invention]

[0012] According to the present invention, it is possible to easily manufacture a motor while reducing iron loss. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an exploded perspective view showing a motor (axial gap motor) according to a first embodiment. [Figure 2] 1 is a cross-sectional view showing a motor (axial gap motor) according to a first embodiment. [Figure 3] FIG. 2 is a partial perspective view showing a stator core of an axial gap motor. [Figure 4] 5A to 5C are schematic diagrams illustrating the manufacture of a stator core. [Figure 5] FIG. 10 is a partial perspective view showing a motor (radial gap motor) according to a second embodiment. [Figure 6] FIG. 10 is a partial cross-sectional view showing a motor (radial gap motor) according to a second embodiment. [Figure 7] FIG. 10 is a partial cross-sectional view showing a motor (radial gap motor) according to a third embodiment. [Figure 8] FIG. 10 is a partial cross-sectional view showing a motor (radial gap motor) according to a fourth embodiment. [Figure 9] FIG. 10 is a partial cross-sectional view showing a motor (radial gap motor) according to a fifth embodiment. [Figure 10] 10(a) is a schematic cross-sectional view taken along line AA in FIG. 9, and (b) is a schematic view for explaining the generation of reluctance torque. [Figure 11] FIG. 10 is a partial cross-sectional view showing a motor (radial gap motor) according to a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of a motor according to the present invention will be described with reference to the drawings. In the drawings, the motor case is omitted to make the internal structure of the motor easier to understand. In the following description, unless otherwise specified, "axial direction" refers to the direction in which the motor's rotating shaft extends, "radial direction" refers to the radial direction passing through the rotating shaft in a plane perpendicular to the axial direction of the rotating shaft, and "circumferential direction" refers to the direction along the circumferential direction centered on the rotating shaft. Furthermore, "inner peripheral side" and "outer peripheral side" are based on the center of the stator core.

[0015] [First embodiment] Fig. 1 is an exploded perspective view showing a motor (axial gap motor) according to a first embodiment, and Fig. 2 is a cross-sectional view showing the motor (axial gap motor) according to the first embodiment. The motor of this embodiment is an axial gap motor 100. This axial gap motor 100 is a so-called two-rotor, one-stator type, and includes a rotating shaft 110, a pair of upper and lower rotors (upper rotor 120 and lower rotor 121) fixed to the rotating shaft 110 and arranged a predetermined distance apart in the axial direction, and a stator 130 arranged between the upper rotor 120 and the lower rotor 121 and facing the upper rotor 120 and the lower rotor 121 with gaps in between in the axial direction.

[0016] The rotating shaft 110 is made of a metal material and is formed in a generally cylindrical rod shape, and has a pair of large diameter portions 111 for fixing to the upper rotor 120 and the lower rotor 121, and a small diameter portion 112 that is disposed between the pair of large diameter portions 111 and has a diameter smaller than that of the large diameter portions 111. The rotating shaft 110 is rotatably supported by the motor case via a bearing member (not shown).

[0017] The upper rotor 120 and the lower rotor 121 each have a disk shape with a through hole formed in the center, and are each formed by, for example, stacking a plurality of electromagnetic steel plates in the axial direction. In the upper rotor 120 and the lower rotor 121, a plurality of (eight in this example) permanent magnets 140 are fixed to the main surface facing the stator 130. As shown in FIG. 1 , the eight permanent magnets 140 are arranged at equal intervals in the circumferential direction with a gap between adjacent permanent magnets 140. Furthermore, these permanent magnets 140 are arranged so that the polarity is reversed between adjacent permanent magnets 140 in the circumferential direction and between permanent magnets 140 facing each other in the axial direction.

[0018] The stator 130 is fixed to the motor case via a mounting member (not shown). The stator 130 has a substantially doughnut-shaped stator core 131 and a plurality of coils 132 wound around the stator core 131. The stator core 131 is a wound core formed by winding a thin ribbon of amorphous metal or a thin ribbon of nanocrystalline soft magnetic material. More specifically, the stator core 131 (i.e., the wound core) is a wound body formed by winding a thin ribbon of amorphous metal or a thin ribbon of nanocrystalline soft magnetic material around the rotating shaft 110. A plurality of symmetrical grooves 133 are formed at both ends of the stator core 131 in the axial direction of the rotating shaft 110.

[0019] Fig. 3 is a partial perspective view showing the stator core of the axial gap motor. As shown in Fig. 3, these grooves 133 are arranged at equal intervals in the circumferential direction of the stator 130. Each groove 133 extends in the radial direction from the inner periphery side to the outer periphery side of the stator 130. The grooves 133 have the same width in the radial direction of the stator 130. The depths of the grooves 133 are also the same.

[0020] Moreover, the grooves 133 formed symmetrically at both ends of the stator core 131 are at the same position in the axial direction of the rotating shaft 110. The above-mentioned coils 132 are wound around each groove 133. More specifically, each coil 132 is a winding formed by winding a conducting wire multiple times, and is fitted into a pair of grooves 133 formed symmetrically at both ends in the axial direction while being wound around these grooves 133.

[0021] The stator core 131 having such a structure is manufactured by, for example, a liquid quenching method. Specifically, as shown in FIG. 4(a), first, a molten metal of an amorphous metal or a nanocrystalline soft magnetic material is poured onto a cooled roll and quenched to produce an amorphous metal ribbon or a nanocrystalline soft magnetic material ribbon 134. Next, the manufactured ribbon 134 is wound a plurality of times to form a doughnut-shaped wound body 135 (see FIG. 4(b)), and grooves are machined in the formed wound body 135 (see FIG. 4(c)), thereby manufacturing the stator core 131. Alternatively, the manufactured ribbon 134 may be machined with grooves at predetermined positions (see FIG. 4(d)) and then wound into a doughnut shape to manufacture the stator core 131.

[0022] In the axial gap motor 100 according to this embodiment, as shown by the arrows in Figure 2, a magnetic circuit is formed in which magnetic flux flows along the path of the permanent magnet 140 at the top right of the page → the upper rotor 120 → the permanent magnet 140 at the top left of the page (the adjacent permanent magnet 140) → the stator core 131 (electromagnet) around which the coil 132 is wound → the permanent magnet 140 at the bottom left of the page → the lower rotor 121 → the permanent magnet 140 at the bottom right of the page → the stator core 131 (electromagnet) around which the coil 132 is wound → the permanent magnet 140 at the top right of the page.

[0023] In the axial gap motor 100 of this embodiment, the stator 130 has a stator core 131, which is a wound core, and the stator core 131 is formed by winding a thin ribbon of amorphous metal or a thin ribbon of nanocrystalline soft magnetic material. Therefore, compared to a conventional structure in which an amorphous metal foil strip is cut and laminated, the cutting and lamination processes are unnecessary, making the axial gap motor 100 easier to manufacture. Furthermore, because the stator core 131 is formed from an amorphous metal or a nanocrystalline soft magnetic material, iron loss can be reduced compared to when conventional electromagnetic steel sheets are used. As a result, the axial gap motor 100 can be easily manufactured while reducing iron loss.

[0024] [Second embodiment] Fig. 5 is a partial perspective view showing a motor (radial gap motor) according to a second embodiment, and Fig. 6 is a partial cross-sectional view showing the motor (radial gap motor) according to the second embodiment. The motor of this embodiment is a radial gap motor 200. This radial gap motor 200 includes a rotating shaft 210, a rotor 220 fixed to the rotating shaft 210, and a stator 230 disposed opposite to and surrounding the rotor 220 with a gap therebetween in a radial direction perpendicular to the axial direction of the rotating shaft 210.

[0025] The rotating shaft 210 is made of a metal material and has a cylindrical shape, and is rotatably supported by the motor case via a bearing member (not shown).

[0026] The rotor 220 has a cylindrical shape with a through hole formed in the center, and is formed, for example, by stacking a plurality of electromagnetic steel plates in the axial direction. As shown in Fig. 5, a plurality of permanent magnets (here, 24) are fixed to the outer circumferential wall of the rotor 220. These permanent magnets are divided into two rows, an upper row and an lower row, in the axial direction. To distinguish between them, the permanent magnets arranged in the upper row are referred to as upper permanent magnets 240 and the permanent magnets arranged in the lower row are referred to as lower permanent magnets 241.

[0027] These upper permanent magnets 240 and lower permanent magnets 241 are each curved so as to fit the outer wall of the rotor 220. In the axial direction, adjacent upper permanent magnets 240 and lower permanent magnets 241 are arranged at equal intervals with a gap between them. In the circumferential direction, adjacent upper permanent magnets 240 and lower permanent magnets 241 are arranged at equal intervals with a gap between them.

[0028] Furthermore, the upper permanent magnets 240 and the lower permanent magnets 241 are arranged so that the polarity is reversed between circumferentially adjacent upper permanent magnets 240 or between circumferentially adjacent lower permanent magnets 241, and between axially adjacent upper permanent magnets 240 and lower permanent magnets 241.

[0029] Stator 230 has a plurality of (here, 12) stator cores 231 arranged at equal intervals along the circumferential direction, and coils 232 wound around each stator core 231. Stator core 231 is a wound core formed by winding a thin ribbon of amorphous metal or a thin ribbon of nanocrystalline soft magnetic material. More specifically, stator core 231 (i.e., wound core) is a cut core formed into a substantially C-shape by cutting a wound body formed by winding a plurality of thin ribbons of amorphous metal or nanocrystalline soft magnetic material in a direction intersecting the circumferential direction of the wound body.

[0030] 6, the stator core 231 has a pair of opposing portions 2311, 2312 that face each other in parallel, and a connecting portion 2313 that connects the pair of opposing portions 2311, 2312. The stator core 231 is arranged such that one of the pair of opposing portions 2311, 2312 (for example, the opposing portion 2311) faces the upper permanent magnet 240, and the other opposing portion (for example, the opposing portion 2312) faces the lower permanent magnet 241. Each stator core 231 is fixed to the motor case via, for example, an attachment member (not shown).

[0031] On the other hand, coil 232 is a winding formed by winding a conducting wire multiple times, and is wound around connecting portion 2313 of stator core 231. That is, coil 232 is wound around stator core 231 so that the winding direction thereof coincides with the circumferential direction of the motor.

[0032] The stator core 231 having such a structure is manufactured by a liquid quenching method, similar to the stator core 131 described in the first embodiment. Specifically, as shown in FIG. 4(a), for example, a molten metal of an amorphous metal or a nanocrystalline soft magnetic material is first poured onto a cooled roll and quenched to produce an amorphous metal ribbon or a nanocrystalline soft magnetic material ribbon 134. Next, the manufactured ribbon 134 is wound a plurality of times to form a doughnut-shaped wound body 135 (see FIG. 4(b)). The wound body 135 thus formed is then divided into two equal parts along a direction perpendicular to the winding direction (in other words, a direction intersecting the circumferential direction of the wound body), thereby manufacturing the stator core 231. In this manner, two stator cores 231 can be formed from one wound body.

[0033] In the radial gap motor 200 according to this embodiment, as shown by the arrows in FIG. 6, a magnetic circuit is formed in which magnetic flux flows, for example, through the upper permanent magnet 240 → stator core 231 (electromagnet) wound with coil 232 → lower permanent magnet 241 → rotor 220 → upper permanent magnet 240.

[0034] In the radial gap motor 200 of this embodiment, the stator 230 has a stator core 231, which is a wound core, and the stator core 231 is formed by winding a thin ribbon of amorphous metal or a thin ribbon of nanocrystalline soft magnetic material. Therefore, compared to a conventional structure in which an amorphous metal foil strip is cut and laminated, cutting and lamination operations are not required, and the radial gap motor 200 can be easily manufactured. Furthermore, because the stator core 231 is formed from an amorphous metal or a nanocrystalline soft magnetic material, iron loss can be reduced compared to when conventional electromagnetic steel sheets are used. As a result, the radial gap motor 200 can be easily manufactured while reducing iron loss.

[0035] [Third embodiment] A third embodiment of the motor will be described below with reference to Fig. 7. The motor of this embodiment is a radial gap motor like the second embodiment described above, but differs from the second embodiment in the arrangement of the coils. Only the differences from the second embodiment will be described below.

[0036] Fig. 7 is a partial cross-sectional view showing a motor (radial gap motor) according to a third embodiment. As shown in Fig. 7, in this embodiment, two coils 232 are wound around each stator core 231. One of the two coils 232 is wound around the opposing portion 2311, and the other is wound around the opposing portion 2312. That is, in this embodiment, the coils 232 are wound around the stator core 231 so that the winding direction is perpendicular to the circumferential direction of the motor.

[0037] The stator core 231 is fixed to the motor case 260 by screws via a mounting member 250 that surrounds the connecting portion 2313, for example.

[0038] In the radial gap motor 201 according to this embodiment, a magnetic circuit is formed in which magnetic flux flows from the upper permanent magnet 240 to the stator core 231 (electromagnet) wound with two coils 232, then to the lower permanent magnet 241, then to the rotor 220, and finally to the upper permanent magnet 240, as shown by the arrows in FIG. 7.

[0039] According to the radial gap motor 201 of this embodiment, it is possible to obtain the same effects as those of the second embodiment described above, and in addition, since the two coils 232 are wound around the opposing portions 2311 and 2312 of the stator core 231 so that the winding directions of the two coils 232 are perpendicular to the circumferential direction of the motor, the radial dimension of the motor can be made smaller than that of the second embodiment described above.

[0040] [Fourth embodiment] A fourth embodiment of the motor will be described below with reference to Fig. 8. The motor of this embodiment is a radial gap motor like the third embodiment described above, but differs from the third embodiment in the arrangement of the permanent magnets. Only the differences from the third embodiment will be described below.

[0041] Fig. 8 is a partial cross-sectional view showing a motor (radial gap motor) according to a fourth embodiment. As can be seen by comparing Fig. 8 with Fig. 7, the radial gap motor 201 of the third embodiment shown in Fig. 7 is a surface permanent magnet motor (SPM), while the radial gap motor 202 of this embodiment is an interior permanent magnet motor (IPM).

[0042] That is, in the radial gap motor 202 according to this embodiment, the permanent magnets 242 are not fixed to the outer peripheral wall of the rotor 220 as in the third embodiment, but are embedded in the rotor 220. The permanent magnets 242 are arranged so that the direction of their magnetic fields is along the axial direction of the motor.

[0043] In the radial gap motor 202 according to this embodiment, as shown by the arrows in FIG. 8, a magnetic circuit is formed in which magnetic flux flows from the rotor 220 in which the permanent magnet 242 is embedded → the stator core 231 (electromagnet) around which two coils 232 are wound → the rotor 220 in which the permanent magnet 242 is embedded.

[0044] The radial gap motor 202 of this embodiment not only provides the same operational effects as the third embodiment, but also the following operational effects. That is, because the permanent magnets 242 are embedded in the rotor 220, the mechanical strength is improved and the motor can be adapted to high-speed rotation that can withstand centrifugal force. Furthermore, because the permanent magnets 242 are embedded in the rotor 220, reluctance torque can be utilized in addition to magnet torque, making it possible to achieve high torque.

[0045] [Fifth embodiment] A fifth embodiment of the motor will be described below with reference to Figures 9 and 10. The motor of this embodiment is a radial gap motor like the fourth embodiment described above, but differs from the fourth embodiment in that grooves are provided in the rotor. Only the differences from the fourth embodiment will be described below.

[0046] FIG. 9 is a partial cross-sectional view showing a motor (radial gap motor) according to a fifth embodiment, and FIG. 10(a) is a schematic cross-sectional view taken along line AA in FIG. 9. As shown in FIGS. 9 and 10(a), a rotor 220 according to this embodiment is provided with a plurality of grooves 221 that expose a portion of the embedded permanent magnets 242. These grooves 221 are arranged in a one-to-one correspondence with the plurality of stators 230, with their depth direction aligned with the axial direction of the motor. When viewed from the axial direction of the motor, each groove 221 is C-shaped, with the opening of the C facing the stator core 231 (see FIG. 10(a)).

[0047] 9, the grooves 221 extend from both axial end surfaces of the rotor 220 (i.e., both the upper and lower end surfaces of the rotor 220) until they expose the permanent magnets 242 embedded in the rotor 220. In other words, the permanent magnets 242 form the bottom of the grooves 221.

[0048] In the radial gap motor 203 according to this embodiment, as shown by the arrows in FIG. 9, a magnetic circuit is formed in which magnetic flux flows from the rotor 220 in which the permanent magnet 242 is embedded → the stator core 231 (electromagnet) around which two coils 232 are wound → the rotor 220 in which the permanent magnet 242 is embedded.

[0049] The radial gap motor 203 of this embodiment not only provides the same operational effects as the fourth embodiment, but also provides the following operational effects. That is, as shown by the arrow in FIG. 10(b), the rotor 220 is provided with a groove 221 that exposes a portion of the permanent magnet 242, and therefore two reluctance torques are generated in the rotor 220 across the groove 221. One is a reluctance torque generated between the groove 221 and the rotating shaft 210, and the other is a reluctance torque generated between the groove 221 and the stator 230. Therefore, the radial gap motor 203 of this embodiment can further increase the reluctance torque compared to the fourth embodiment, thereby achieving even higher torque.

[0050] [Sixth embodiment] A sixth embodiment of the motor will be described below with reference to Fig. 11. The motor of this embodiment is a radial gap motor like the fourth embodiment described above, but differs from the fourth embodiment in that the permanent magnets are arranged three-dimensionally. Only the differences from the fourth embodiment will be described below.

[0051] Fig. 11 is a partial cross-sectional view showing a motor (radial gap motor) according to a sixth embodiment. As shown in Fig. 11, in a radial gap motor 204 according to this embodiment, a permanent magnet 243 is integrated with a rotor 220 with its north and south poles each formed in an "E" shape in cross section so as to form, for example, a Halbach array. This increases the surface area of the magnet. Therefore, it is possible to achieve improved torque even when a ferrite magnet is used.

[0052] That is, NdFeB magnets are generally used as motor magnets because they are small but have strong magnetic force. However, NdFeB magnets are more expensive than ferrite magnets. By arranging the magnets in a Halbach array as described above and optimizing the direction of the magnetic poles, it becomes possible to use ferrite magnets that can ensure the same torque as NdFeB magnets.

[0053] Therefore, according to the radial gap motor 204 of this embodiment, in addition to being able to obtain the same effects as those of the fourth embodiment described above, it is possible to use a ferrite magnet for the motor magnet, thereby reducing the manufacturing cost of the radial gap motor 204.

[0054] In the above embodiment, the upper rotor 120, the lower rotor 121, and the rotor 220 are described as being formed by stacking a plurality of electromagnetic steel plates, but this is not limiting. For example, these rotors may have a wound core formed by winding a thin ribbon of amorphous metal or a thin ribbon of nanocrystalline soft magnetic material, similar to the stators 130 and 230, or may be a powder magnetic core.

[0055] The inventors of the present application carried out the following comparative examples and examples in order to verify the effects of the axial gap motor according to the first embodiment.

[0056] [Comparative Example 1] In Comparative Example 1, a radial gap motor using conventional electromagnetic steel sheets was used to examine its maximum torque and iron loss. The main dimensions of the radial gap motor according to Comparative Example 1 are as shown in Table 1 below.

[0057] [Examples 1 to 3] In Examples 1, 2, and 3, the axial gap motor described in the first embodiment was used to investigate the maximum torque and iron loss under the conditions shown in Table 1 below, and the ratios to Comparative Example 1 were calculated and summarized in Table 1. Note that Example 1 used a 7 mm thick magnet (space factor 95%), Example 2 used a 7 mm thick magnet (space factor 90%), and Example 3 used a 5 mm thick magnet (space factor 95%). The space factor here is the volume fraction of the magnetic material relative to the volume of the wound core, and the smaller the number, the larger the air gap.

[0058] [Table 1]

[0059] As can be seen from Table 1, when the outer diameter of the motor is the same, the axial gap motors having wound cores shown in Examples 1 to 3 were able to reduce iron loss compared to the radial gap motor using the electromagnetic steel sheet shown in Comparative Example 1. In particular, in the case of Example 1, iron loss was reduced while the maximum torque was maintained at approximately the same level as in Comparative Example 1.

[0060] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design modifications can be made without departing from the spirit of the present invention as set forth in the claims. [Explanation of symbols]

[0061] 100: Axial gap motor, 110: Rotating shaft, 120: Upper rotor, 121: Lower rotor, 130: Stator, 131: Stator core, 132: Coil, 133: Groove, 134: Thin ribbon, 135: Winding body, 140: Permanent magnet, 200, 201, 202, 203, 204: Radial gap motor, 210: Rotating shaft, 220: Rotor, 221: Groove, 230: Stator, 231: Stator core, 232: Coil, 240: Upper permanent magnet, 241: Lower permanent magnet, 242, 243: Permanent magnet, 250: Mounting member, 260: Motor case, 2311, 2312: Opposing portion, 2313: Connecting portion

Claims

1. A motor including a stator around which a coil is wound, a rotor rotatably provided relative to the stator, and a rotary shaft fixed to the rotor, A motor characterized in that at least the stator has a wound core formed by winding a thin ribbon of amorphous metal or a thin ribbon of nanocrystalline soft magnetic material.

2. The motor according to claim 1 , wherein the motor is an axial gap motor.

3. the wound core is a wound body formed by winding the amorphous metal ribbon or the nanocrystalline soft magnetic material ribbon around the rotation shaft a plurality of times, a plurality of symmetrical grooves are formed at both ends of the wound body in the axial direction of the rotation shaft, The motor according to claim 2 , wherein the coil is wound around each groove.

4. 2. The motor according to claim 1, wherein the motor is a radial gap motor.

5. 5. The motor according to claim 4, wherein the wound core is a cut core formed by cutting a wound body formed by winding a thin ribbon of the amorphous metal or a thin ribbon of the nanocrystalline soft magnetic material multiple times in a direction intersecting with the circumferential direction.

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