WO2020255435A1 - Axial-gap rotating electric machine - Google Patents

Abstract

This axial-gap rotating electric machine (1000) is provided with a rotor (200) and a stator (100) disposed facing the rotor (200) with a gap interposed therebetween, said gap being provided along the shaft center (700) direction of the rotor (200). The rotor (200) is provided with: a base (220); a groove (222) provided on the end surface (221) of the base (220) on the stator (100) side thereof along the circumferential direction of the rotor (200); a magnet (210) disposed in the groove (222); and a resin (230) for fixing the magnet (210) in the groove (222) by molding. The base (220) has recessed portions (2231), (2243) that are in communication with the groove (222) and are filled with the resin (230). Part of the base (220) is adjacent to the stator (100) side of the resin (230), which is filled in the recessed portions (2231), (2243).

Description

Axial gap type rotary electric machine

The present invention relates to an axial gap type rotary electric machine.

The axial gap type rotary electric machine has a structure in which a disk-shaped rotor and a stator are arranged so as to face each other in the direction of the axis of rotation. Since the facing area between the rotor and the stator, which is the torque generation surface, increases in proportion to the square of the rotor diameter, a shape with a small aspect ratio, that is, a shape with a radial dimension larger than the shaft length, can be used to increase output. It has the feature that it is easy to improve characteristics such as efficiency.

The rotor of this axial gap type rotary electric machine consists of a yoke fastened to a rotating shaft and a magnet placed on the surface of the yoke, and there is a rotor in which the magnet and the yoke are integrally molded with resin. For example, Patent Document 1 discloses a rotor in which a permanent magnet arranged on one end face of the back yoke is held in the back yoke by a retaining means made of a molded synthetic resin.

Japanese Unexamined Patent Publication No. 2008-86142

In the rotor of the axial gap type rotary electric machine disclosed in Patent Document 1, since the retaining means made of molded synthetic resin is in contact with the outside air, it deteriorates due to environmental substances such as oxygen and the heat of the outside air, and is a permanent magnet. May not be able to hold. An object of the present invention is to provide an axial gap type rotary electric machine capable of preventing the rotor from being damaged even if the resin of the rotor integrally molded with the magnet and the yoke deteriorates.

In order to solve the above problems, the present invention includes an axial having a rotor and a stator arranged to face the rotor via a gap provided along the central axis direction of the rotor. In the gap type rotor, the rotor includes a base, a groove provided on the end face of the base on the stator side along the circumferential direction of the rotor, a magnet arranged in the groove, and the said. A resin for molding and fixing a magnet in the groove is provided, the base has a recess that communicates with the groove and is filled with the resin, and the stator side of the resin filled in the recess has the recess. It is characterized in that a part of the base is adjacent to each other.

According to the present invention, it is possible to prevent deterioration and damage of the resin in a rotor in which a magnet and a yoke are integrally molded with a resin, so that the life of the rotor can be extended. Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is sectional drawing of the axial gap type motor using the rotor according to 1st Embodiment of this invention. It is sectional drawing which fitted the shaft to the rotor by 1st Embodiment of this invention. It is an enlarged sectional view of the rotor according to 1st Embodiment of this invention. It is sectional drawing which fitted the shaft to the rotor according to 2nd Embodiment of this invention. It is an enlarged sectional view of the rotor according to the 2nd Embodiment of this invention. It is a perspective view which shows the other shape in the plurality of permanent magnets used for the rotor by 2nd Embodiment of this invention. It is sectional drawing which fitted the shaft to the rotor according to 3rd Embodiment of this invention. It is an enlarged sectional view of the rotor according to the 3rd Embodiment of this invention. It is sectional drawing which fitted the shaft to the rotor according to 4th Embodiment of this invention. It is an enlarged sectional view of the rotor according to 4th Embodiment of this invention. It is sectional drawing which fitted the shaft to the rotor according to 5th Embodiment of this invention. FIG. 5 is an enlarged cross-sectional view of a rotor according to a fifth embodiment of the present invention. It is sectional drawing which fitted the shaft to the rotor according to 6th Embodiment of this invention. FIG. 5 is an enlarged cross-sectional view of a rotor according to a sixth embodiment of the present invention. It is sectional drawing which fitted the shaft to the rotor according to 7th Embodiment of this invention. It is an enlarged sectional view of the rotor according to 7th Embodiment of this invention. It is sectional drawing which fitted the shaft to the rotor according to 8th Embodiment of this invention. FIG. 5 is an enlarged cross-sectional view of a rotor according to an eighth embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view of a rotor according to another embodiment of the present invention. It is an enlarged sectional view of the rotor according to another embodiment of this invention.

Hereinafter, the configuration and operation of the rotor of the axial gap type motor according to the first to eighth embodiments of the present invention will be described with reference to the drawings. In each figure, the same reference numerals indicate the same parts.

[First Embodiment]
1A is a cross-sectional perspective view of an axial gap type motor using a rotor according to the first embodiment of the present invention, FIG. 1B is a cross-sectional perspective view of a rotor fitted with a shaft according to the first embodiment, and FIG. 1C is a first aspect of the present invention. It is an enlarged sectional view of the rotor according to an embodiment. In the rotor of FIG. 1B, the resin is omitted so that the shapes inside the permanent magnet and the yoke can be seen.

As shown in FIG. 1A, the axial gap type motor 1000 (hereinafter referred to as the motor 1000) is a double rotor type rotary electric machine that faces the stator (stator) 100 so as to be sandwiched between the two rotors (rotors) 200. is there. The motor 1000 includes a stator 100, a rotor 200, a housing 300, a bracket 400, a shaft 500, and a bearing 600.

The stator 100 has a plurality of (12 in this embodiment) core members 140 arranged in an annular shape around the shaft 500. Each core member 140 is wound around a core 110 whose both end surfaces are substantially trapezoidal pillars, a tubular bobbin (not shown) covering the side surface of the core 110, and a side surface of the core 110 via the bobbin. It includes a coil 120. Each of the twelve core members 140 arranged in an annular shape is integrally molded by the resin 130 in the housing 300, and is molded into one stator 100. As the core 110, a laminated body of an electromagnetic steel plate or an amorphous metal, or a soft magnetic material such as a dust core can be used.

The rotor 200 faces the stator 100 via a gap provided along the axis 700 direction. The shaft 500 that meshes with the rotor 200 is rotatably supported by the bracket 400 via the bearing 600, and rotates with the rotating rotor 200 by passing electricity through the stator 100 to output the rotational force of the rotor 200. The bracket 400 rotatably supports the shaft 500 via a bearing 600 and is fixed to both ends of the housing 300 to protect the rotor 200. A terminal block (not shown) having a terminal for electrically connecting to the coil 120 is provided on the outer peripheral side surface of the housing 300, and the primary side electric wire and the secondary side electric wire are electrically connected. You can do it.

As shown in FIG. 1B, the rotor 200 is arranged in a substantially disk-shaped base 220, a groove 222 provided on an end surface 221 of the base 220 on the stator 100 side along the circumferential direction of the rotor 200, and a groove 222. A permanent magnet (magnet) 210 and a resin 230 (see FIG. 1A) for molding and fixing the permanent magnet 210 in the groove 222 are provided.

The base 220 is a substantially disk-shaped member composed of a soft magnetic material such as iron or dust core and acting as a joint iron (yoke). It supports the permanent magnet 210 and is coupled to the shaft 500 so as to rotate. doing. Further, the end surface 221 of the base 220 on the stator 100 side is provided with a groove 222 along the circumferential direction of the rotor 200 as described above. The permanent magnet 210 is a ring-shaped disk and is arranged in the groove 222 of the base 220.

As shown in FIG. 1C, the groove 222 is composed of an inner peripheral wall 223, an outer peripheral wall 224, and a bottom surface 225.

When the permanent magnet 210 is arranged in the groove 222, the inner peripheral wall 223 forms a space for filling the resin 230 with the inner peripheral side surface 2102 of the permanent magnet 210. Therefore, the distance from the axis 700 is smaller on the inner peripheral wall 223 than on the inner peripheral side surface 2102 of the permanent magnet 210. Further, the inner peripheral wall 223 is provided with a recess 2231.

On the bottom surface 225 side of the outer peripheral wall 224, a small diameter surface 2241 with which the outer peripheral side surface 2101 of the permanent magnet 210 abuts is formed. A large-diameter surface 2242 is formed on the stator 100 side of the outer peripheral wall 224, and a recess 2243 is formed on the outer peripheral wall 224 between the small-diameter surface 2241 and the large-diameter surface 2242.

In the present embodiment, the recess 2231 is formed on the entire circumference of the inner peripheral wall 223, but may be formed only on a part of the inner peripheral wall 223. Further, although the recess 2243 is formed on the entire circumference of the outer peripheral wall 224, it may be formed only on a part of the outer peripheral wall 224 instead of the entire circumference. In order to increase the strength of the resin 230 filled in the recesses 2231 and 243, it is necessary to reduce the stress generated in the resin 230 due to centrifugal force or temperature rise. Therefore, when processing the recesses 2231 and 243, it is preferable to provide R chamfers at the corners.

The outer peripheral side surface 2101 of the permanent magnet 210 comes into contact with the small diameter surface 2241 of the outer peripheral wall 224. Therefore, the permanent magnet 210 is fixed in the circumferential direction of the base 220. Further, the inner peripheral side surface 2102 of the permanent magnet 210 is formed so that the inner diameter increases toward the stator 100 side in the axial center 700 direction. That is, the permanent magnet 210 is formed with a hole whose inner diameter expands toward the stator 100 side. The permanent magnet 210 is formed of a bond magnet or a ferrite magnet, generates a magnetic field, and repeatedly attracts and repels the magnetic force generated from the core member 140 of the stator 100 to rotate the rotor 200 around the axis 700. Therefore, the surface of the ring-shaped permanent magnet 210 is magnetized so as to have the number of magnetic poles corresponding to the number of phases of the AC power supply and the number of core members 140.

A permanent magnet 210 and a resin 230 filled by molding are arranged in the groove 222 of the base 220, and the permanent magnet 210 is molded and fixed to the base 220. The resin 230 is filled and solidified between the large-diameter surface 2242 and the recess 2243 of the outer peripheral wall 224 and the outer peripheral side surface 2101 of the permanent magnet 210, and between the inner peripheral wall 223 and the inner peripheral side surface 2102 of the permanent magnet 210. Further, it is preferable that the base 220, the permanent magnet 210, and the resin 230 are made of materials having a coefficient of linear expansion close to each other to reduce the thermal stress generated in the rotor 200.

Then, the base 220 has recesses 2231 and 243 that communicate with the groove 222 and are filled with the resin 230, and the recesses 2231 and 243 are filled with the resin 230. Focusing on the configuration other than the base, the convex portions 2301,302 are formed by the resin entering the recesses 2231 and 243. Then, a part of the base 220 ( recesses 2231,243 in the base 220) is on the stator 100 side (lower side in FIG. 1C) of the convex portions 2301,302 which are the resins 230 filled in the two recesses 2231 and 243. The stopper portions 2232 and 2244, which are the portions on the stator 100 side of the above, are adjacent to each other. The stopper portions 2232 and 2244 can prevent the magnet of the rotor from being attracted to the stator side by the magnetic attraction force and coming off from the base. In other words, the base 220 is the base 220 when the rotor 200 is viewed along the axes AA and BB parallel to the axis 700 in the cross section of the rotor 200 including the axis 700 of the rotor 200. The stopper portions 2232 and 2244, which are a part of the stopper portion 2232, 2244, are provided with recesses 2231, 243 provided so that convex portions 2301, 302, which are a part of the resin 230, appear adjacent to each other on the opposite side of the stator 100. Further, the convex portions 2301,302, which are the resin 230 filled in the concave portions 2231, 243, are covered with the concave portions 2231, 243 and the resin 230, and are provided inside the rotor 200. The base 220 of the present embodiment includes two recesses that communicate with the groove 222 and are filled with the resin 230, but may include only one recess.

The motor 1000 having such a configuration operates as follows. The output line from the inverter is connected to the primary side of the terminal block, and a three-phase alternating current is applied to the coil 120. As a result, a rotating magnetic field is formed in the stator 100, and torque is generated by attracting and repelling the DC magnetic field formed in the rotor 200 by the permanent magnet 210. When the motor is driven, not only the centrifugal force generated in the radial direction of the permanent magnet 210 arranged in the groove 222 of the rotor 200 but also the magnetic attraction force is generated on the stator 100 side in the axial direction 700 direction.

In the present embodiment, the base 220 has recesses 2231 and 243 that communicate with the groove 222 and are filled with the resin 230, and the convex portions 2301,302 that are the resin 230 filled in the recesses 2231 and 243. The stopper portions 2232 and 2244, which are a part of the base 220 (the portion of the recesses 2231 and 243 on the stator 100 side), are adjacent to the stator 100 side of the resin 230 so as to hinder the movement of the resin 230 along the axis 700 direction. doing. In this structure, the convex portions 2301,302, which are the resin 230 in the recesses 2231,243, are located inside the rotor 200, so that the convex portions 2301,302, which are the resin 230 in the recesses 2231,243, come into contact with the outside air. Is blocked. Therefore, the convex portions 2301,302, which are the resins 230 in the concave portions 2231,243, are prevented from being easily deteriorated by environmental substances such as oxygen and the heat of the outside air like the resin 230 exposed on the surface of the rotor 200. Therefore, it is possible to prevent the holding function of the permanent magnet 210 (the function of restraining the permanent magnet 210 in the direction of the axis 700) from being lowered due to the continuous use of the rotor 200. In the present embodiment, since the recess 2231 is formed in an annular shape on the entire circumference of the inner peripheral wall 223 and the recess 2241 is formed in an annular shape on the entire circumference of the outer peripheral wall 224 of the groove 222, the holding function of the permanent magnet 210 can be further enhanced.

In the present embodiment, the resin 230 and the permanent magnet 210 are brought into contact with each other via the inner peripheral side surface 2102 of the permanent magnet 210 whose inner diameter increases toward the stator 100 side to hold the permanent magnet 210 of the resin 230. The function (the function of restraining the permanent magnet 210 in the direction of the axis 700) is enhanced. That is, the permanent magnet 210 can be held firmly on the base 220 as compared with the case where the inner peripheral side surface of the permanent magnet 210 is provided substantially vertically.

Further, by providing a gap between the inner peripheral wall 223 and the outer peripheral wall 224 of the base 220 and the permanent magnet 210, the magnetic resistance of the permanent magnet 210 against the leakage flux is increased, and the decrease in motor output and efficiency is suppressed. Can be done. Further, by using the ring-shaped permanent magnet 210, it is possible to prevent the permanent magnet 210 from scattering even if the centrifugal force becomes large.

Further, the base 220 can be manufactured at low cost because the recesses 2231 and 243 can be easily additionally processed by cutting the groove 222 with a lathe with respect to the disk-shaped structure manufactured by casting or forging.

[Second Embodiment]
Next, the rotor according to the second embodiment of the present invention will be described with reference to the drawings. FIG. 2A is a sectional perspective view in which the shaft 500 is fitted to the rotor 201 according to the second embodiment of the present invention, and FIG. 2B is an enlarged sectional view of the rotor 201 according to the second embodiment of the present invention. In the rotor 201 (lower side) on the counterload side of FIG. 2A, the resin 231 is omitted so that the shapes inside the permanent magnet 211 and the base 220 can be seen.

The difference between this embodiment and the first embodiment is the shape of the permanent magnet 211 and the resin 231. Therefore, since the cross section of the motor is the same as that of FIG. 1A, the description is omitted, and the description of the parts, configurations, etc. that overlap with the first embodiment is omitted in principle.

As shown in FIG. 2A, the rotor 201 according to the present embodiment includes a substantially disk-shaped base 220 and a groove 222 provided on the end surface 221 of the base 220 on the stator 100 side along the circumferential direction of the rotor 201. A permanent magnet 211 having a number of magnetic poles arranged in the groove 222 at a predetermined interval and a resin 231 for molding and fixing the permanent magnet 211 having a number of magnetic poles in the groove 222 are provided. Since the base 220 is the same as that of the first embodiment, the description thereof will be omitted. The permanent magnet 211 is a fan-shaped plate, and the number of magnetic poles is arranged in the groove 222 of the base 220.

As shown in FIG. 2B, the outer peripheral side surface 2111 of the permanent magnet 211 is in contact with the small diameter surface 2241. As in the first embodiment, the permanent magnet 211 is formed of a bond magnet or a ferrite magnet, generates a magnetic field, and repeatedly attracts and repels the magnetic force generated from the core member 140 of the stator 100, and the axis 700. The rotor 201 is rotated around the magnet. Therefore, a permanent magnet 211 having a number of magnetic poles corresponding to the number of phases of the AC power supply and the number of core members 140 is arranged in the groove 222 of the base 220.

Further, the periphery of the permanent magnet 211 arranged in the groove 222 of the base 220 is filled with the resin 231. The inner peripheral side surface 2112 of the permanent magnet 211 is formed so that the distance between the groove 222 and the inner peripheral wall 223 increases toward the stator 100 side in the axial direction 700 direction. Therefore, the permanent magnet 211 cannot move in the stator 100 side in the axial direction 700 direction and in the inner diameter direction of the base 220 due to the resin 231 in contact with the inner peripheral side surface 2112 of the permanent magnet 211. Further, since the outer peripheral side surface 2111 of the permanent magnet 211 having the number of magnetic poles is in contact with the small diameter surface 2241 and the resin 230 is filled between the large diameter surface 2242 and the recess 2243, it moves in the outer diameter direction of the base 220. Can not.

Then, as in the first embodiment, the inner peripheral wall 223 and the outer peripheral wall 224 forming the groove 222 of the base 220 are formed with the recesses 2231 and the recesses 2243, respectively, filled with the resin 231 and the convex portions 2311 and 2312. It is formed. Therefore, the base 220 has recesses 2231 and 243 that communicate with the groove 222 and are filled with the resin 231, and the convex portions 2311 and 2312, which are the resins 231 filled in the recesses 2231 and 243, are on the stator 100 side. , The stopper portions 2232 and 2244, which are a part of the base 220 (the portion of the recesses 2231 and 243 on the stator 100 side), are adjacent to each other so as to hinder the movement of the resin 231 along the axis 700 direction. That is, the base 220 is the base 220 when the rotor 201 is viewed along the axes AA and BB parallel to the axis 700 in the cross section of the rotor 201 including the axis 700 of the rotor 201. The stoppers 2232 and 2244, which are part of the above, are provided with recesses 2231,243 provided so that the convex portions 2311 and 2312, which are a part of the resin 231 and appear adjacent to each other, on the opposite side of the stator 100. Further, the convex portions 2311 and 2312, which are the resins 231 filled in the concave portions 2231 and 243, are covered with the concave portions 2231 and 243 and the resin 231 and are provided inside the rotor 201.

Further, the resin 231 is filled between the outer peripheral wall 224 of the groove 222 of the base 220 and the outer peripheral side surface 2111 of the permanent magnet 211, and between the inner peripheral wall 223 of the base 220 and the inner peripheral side surface 2112 of the permanent magnet 211. Not only is it filled between the permanent magnets 211 adjacent to the base 220 in the circumferential direction. Therefore, the permanent magnet 211 cannot move in the circumferential direction. Further, the resin 231 filled between the permanent magnets 211 adjacent to each other in the circumferential direction is the resin 231 filled between the outer peripheral wall 224 of the groove 222 of the base 220 and the outer peripheral side surface 2111 of the permanent magnet 211, and the base. The resin 231 filled between the inner peripheral wall 223 of 220 and the inner peripheral side surface 2112 of the permanent magnet 211 is connected.

In the present embodiment, unlike the first embodiment, the permanent magnet 211 is not an annulus but a divided configuration. Therefore, the outer peripheral side surface 2111 of the permanent magnet 211 can be brought into contact with the small diameter surface 2241 of the outer peripheral wall 224 of the groove 222 without making the outer diameter of the permanent magnet 211 highly accurate, and the processing cost of the permanent magnet 211 can be suppressed. Can be done. Further, in a high-power motor or a high-power density motor, a large centrifugal force is applied to the permanent magnet 211 because the rotor has a larger diameter and a higher speed. Since the permanent magnet 210 of the first embodiment has a ring shape, tensile stress is generated with respect to centrifugal force. On the other hand, since the permanent magnet 211 of the present embodiment has a divided structure, no tensile stress is generated with respect to the centrifugal force. Therefore, the large centrifugal force becomes a force that tends to scatter the permanent magnet 211 in the outer diameter direction as it is. However, in the rotor 201 according to the present embodiment, since each of the outer peripheral side surfaces 2111 of the permanent magnets 211 having a divided configuration comes into contact with the small diameter surface 2241, it is possible to prevent each of the permanent magnets 211 from scattering in the outer diameter direction. it can. Further, in the rotor according to the comparative example in which the abutting portion abutting on the outer peripheral side surface 2111 of the permanent magnet is made of resin, it is necessary to make the abutting portion thick so as to withstand the centrifugal force. However, in the present embodiment, since the small diameter surface 2241 in contact with the outer peripheral side surface 2111 of the permanent magnet 211 is formed of iron, a dust core, or the like, it can be made thinner, and the outer diameter of the rotor 201 can be reduced. Further, since the small diameter surface 2221 is provided on the outer peripheral wall 224 on the bottom surface 225 side of the groove 222, the bending moment in the outer diameter direction applied to the outer peripheral wall 224 can be reduced by the centrifugal force acting on the permanent magnet 211, and the outer peripheral wall 224 can be formed. The small diameter surface 2241 makes the wall thicker, and the rigidity can be increased. Further, by providing a gap between the permanent magnets 211 having the number of magnetic poles, the magnetic resistance of the permanent magnets 211 against the leakage flux can be increased, and a decrease in motor output and efficiency can be suppressed.

The shape of the permanent magnet is not limited to the shape of the permanent magnet 211 shown in FIGS. 2A and 2B. For example, as shown in FIG. 3, a permanent magnet 212 having an axially reduced portion 2121 that is tapered in the circumferential direction of the base 220 toward the stator 100 in the axial center 700 direction may be used. Good. By covering the axially reduced portion 2121 with the resin 231 filled between the permanent magnets 212 adjacent to each other in the circumferential direction, it is possible to prevent the permanent magnets 212 from moving toward the stator 100 in the axial direction 700. Can be done. The permanent magnet 212 can be easily manufactured by molding a bond magnet in which magnetic powder and resin are mixed by injection molding. Further, when the permanent magnet 212 is manufactured by sintering, the axially reduced portion 2121 can be formed without increasing the processing cost by using the die punching taper.

[Third Embodiment]
Next, the rotor according to the third embodiment of the present invention will be described with reference to the drawings. FIG. 4A is a sectional perspective view in which the shaft 500 is fitted to the rotor 202 according to the third embodiment of the present invention, and FIG. 4B is an enlarged sectional view of the rotor 202 according to the third embodiment of the present invention. In the rotor 202 (lower side) on the counterload side of FIG. 4A, the resin 232 is omitted so that the shapes inside the permanent magnet 211 and the base 240 can be seen.

The difference between this embodiment and the second embodiment is the shape of the inner peripheral wall 243 and the outer peripheral wall 244 in the groove 242 of the base 240, and the shape of the resin 232. Therefore, since the cross section of the motor is substantially the same as that of FIG. 1A, it is omitted, and the description of parts, configurations, etc. that overlap with the second embodiment is omitted in principle.

As shown in FIG. 4A, the rotor 202 according to the present embodiment includes a substantially disk-shaped base 240, and a groove 242 provided on the end surface 241 of the base 240 on the stator 100 side along the circumferential direction of the rotor 202. A permanent magnet 211 having a number of magnetic poles arranged in the groove 242 and a resin 232 for molding and fixing the permanent magnet 211 having a number of magnetic poles in the groove 242 are provided. The base 240 is provided with a groove 242 on the end surface 241 on the stator 100 side along the circumferential direction of the rotor 202.

As shown in FIG. 4B, the groove 242 is composed of an inner peripheral wall 243, an outer peripheral wall 244, and a bottom surface 245. The inner peripheral wall 243 is provided with a recess 2431 on the bottom surface 245 side, and the outer peripheral wall 244 is provided with a recess 2441 on the bottom surface 245 side. At this time, since the side surface of the recess 2431,241 in the direction of the axial center 700 on the opposite side of the stator 100 is the same surface as the bottom surface 245 of the groove 242, the recess 2431,241 is machined with the bottom surface 245 of the groove 242 by a lathe. It can be machined continuously and the man-hours can be reduced because there is no need to align the cutting tool. Further, since the permanent magnet 211 is the same as that of the second embodiment, the description thereof will be omitted.

The resin 232 is filled in the groove 242 in which the permanent magnet 211 is arranged. That is, between the inner peripheral wall 243 and the inner peripheral side surface 2112 of the permanent magnet 211, between the outer peripheral wall 244 and the outer peripheral side surface 2111 of the permanent magnet 211 (recessed portion 2441), and between the permanent magnets 211 adjacent to each other in the circumferential direction. The resin 232 is filled. Since the outer peripheral wall 244 and the outer peripheral side surface 2111 of the permanent magnet 211 are not opened in the axial direction 700 direction, the resin cannot be directly filled. However, by filling and flowing the resin 232 between the permanent magnets 211 adjacent to each other in the circumferential direction in the recess 2441, the resin 232 can be filled between the outer peripheral wall 244 and the outer peripheral side surface 2111 of the permanent magnets 211. Further, the resin 232 filled between the permanent magnets 211 adjacent to each other in the circumferential direction includes the resin 232 filled between the inner peripheral wall 243 and the inner peripheral side surface 2112 of the permanent magnets 211, and the outer peripheral wall 244 and the permanent magnets 211. The resin 232 filled between the outer peripheral side surfaces 2111 is connected.

Further, the resin 232 is filled between the inner peripheral wall 243 and the inner peripheral side surface 2112 of the permanent magnet 211, so that the recess 2431 of the inner peripheral wall 243 is filled with the resin 232, and the resin is formed between the permanent magnets 211 adjacent to each other in the circumferential direction. By filling the 232, the resin 232 is filled in the recess 2441 of the outer peripheral wall 244. Therefore, the base 240 has recesses 2431 and 2441 that are filled with the resin 232 that communicates with the groove 242, and the convex portions 2321 and 322 that are the resin 232 filled in the recesses 2431 and 2441 are provided on the stator 100 side. The stopper portions 2431 and 442, which are a part of the base 240 (the portion of the recesses 2431 and 441 on the stator 100 side), are adjacent to each other so as to hinder the movement of the resin 232 along the axis 700 direction. That is, when the base 240 is viewed in the cross section of the rotor 202 including the axis 700 of the rotor 202, the rotor 202 is viewed along the axes AA and BB directions parallel to the axis 700 (see FIG. 4B). The stopper portion 2431,442, which is a part of the base 240, is provided with a concave portion 2431,241 provided so that the convex portions 2321,322, which are a part of the resin 232, appear adjacent to each other on the opposite side of the stator 100. There is. Further, the convex portions 2321 and 322, which are the resin 232 filled in the concave portions 2431 and 441, are covered with the concave portions 2431 and 441 and the resin 232 and are provided inside the rotor 202.

In the present embodiment, since the convex portions 2321 and 322, which are the resin 232 in the concave portions 2431 and 441, are located inside the rotor 202, the convex portions 2321 and 2322, which are the resin 232 in the concave portions 2431 and 441, and the outside air Contact is cut off. Therefore, the convex portions 2321 and 322, which are the resin 232 in the concave portions 2431 and 441, are prevented from being easily deteriorated by environmental substances such as oxygen and the heat of the outside air like the resin 232 exposed on the surface of the rotor 202. Therefore, it is possible to prevent the holding function of the permanent magnet 211 (the restraining function of the permanent magnet 211 in the direction of the axis 700) from being lowered due to the continuous use of the rotor 202. In the present embodiment, since the recess 2431 is formed in an annular shape on the entire circumference of the inner peripheral wall 243 and the recess 2441 is formed on the entire circumference of the outer peripheral wall 244, the holding function of the permanent magnet 211 can be further enhanced.

Further, the inner peripheral side surface 2112 of the permanent magnet 211 is formed so that the distance between the groove 242 and the inner peripheral wall 243 increases toward the stator 100 in the axial 700 direction. Therefore, by bringing the resin 232 and the permanent magnet 211 into contact with each other via the inner peripheral side surface 2112 of the permanent magnet 211, the holding function of the permanent magnet 211 of the resin 232 (the function of restraining the permanent magnet 211 in the axis 700 direction). ) Is being strengthened. That is, the permanent magnet 211 can be held firmly on the base 240 as compared with the case where the inner peripheral side surface of the permanent magnet 211 is provided substantially vertically.

[Fourth Embodiment]
Next, the rotor according to the fourth embodiment of the present invention will be described with reference to the drawings. FIG. 5A is a sectional perspective view in which the shaft 500 is fitted to the rotor 203 according to the fourth embodiment of the present invention, and FIG. 5B is an enlarged sectional view of the rotor 203 according to the fourth embodiment of the present invention. In the rotor 203 (lower side) on the counterload side of FIG. 5A, the resin 233 is omitted so that the shapes inside the permanent magnet 211 and the base 250 can be seen.

The difference between this embodiment and the second embodiment is the shape of the base 250 and the resin 233. Therefore, since the cross section of the motor is substantially the same as that of FIG. 1A, it is omitted, and the description of parts, configurations, etc. that overlap with the second embodiment is omitted in principle.

As shown in FIG. 5A, the rotor 203 according to the present embodiment includes a substantially disk-shaped base 250, and a groove 252 provided on the end surface 251 of the base 250 on the stator 100 side along the circumferential direction of the rotor 203. A permanent magnet 211 having a number of magnetic poles arranged in the groove 252 and a resin 233 for molding and fixing the permanent magnet 211 having a number of magnetic poles in the groove 252 are provided. The base 250 is provided with a groove 252 on the end surface 251 on the stator 100 side along the circumferential direction of the rotor 203.

As shown in FIG. 5B, the groove 252 is composed of an inner peripheral wall 253, an outer peripheral wall 254, and a bottom surface 255. Further, one or more blind holes 256 are provided on the end surface 257 of the base 250 on the anti-stator 100 side. The blind hole 256 communicates with the groove 252 through an opening 258 formed in the inner peripheral wall 253. Then, the portion surrounded by the bottom portion 2561 and the peripheral surface 2562 of the blind hole 256 forms a recess 2563. Further, a small diameter surface 2541 with which the outer peripheral side surface 2111 of the permanent magnet 211 abuts is provided on the bottom surface 255 side of the outer peripheral wall 254, and a large diameter surface 2542 is formed on the stator 100 side of the outer peripheral wall 254. Since the small diameter surface 2541 and the large diameter surface 2542 are the same as the small diameter surface 2241 and the large diameter surface 2242 of the second embodiment, the description thereof will be omitted.

The resin 233 is filled in the groove 252 in which the permanent magnet 211 is arranged. That is, the resin 233 is filled between the inner peripheral wall 253 and the inner peripheral side surface 2112 of the permanent magnet 211, between the outer peripheral wall 254 and the outer peripheral side surface 2111 of the permanent magnet 211, and between the permanent magnets 211 adjacent to each other in the circumferential direction. Will be done. The resin 233 filled between the permanent magnets 211 adjacent to each other in the circumferential direction includes the resin 233 filled between the inner peripheral wall 253 and the inner peripheral side surface 2112 of the permanent magnets 211, and the outer peripheral wall 264 and the permanent magnets 211. The resin 233 filled between the outer peripheral side surfaces 2111 is connected.

Further, by filling the resin 233 between the inner peripheral wall 253 and the inner peripheral side surface 2112 of the permanent magnet 211, the blind hole 256 is filled with the resin 233 through the opening 258 of the inner peripheral wall 253, and the recess 2563 is filled with the resin. 233 is filled. Therefore, the base 250 has a recess 2563 filled with the groove 252 and the resin 233, and the axial center 700 of the resin 233 is located on the stator 100 side of the convex portion 2331 which is the resin 233 filled in the recess 2563. The bottom 2561 of the blind hole 256, which is a part of the base 250, is adjacent so as to hinder the movement along the direction. That is, the base 250 is a part of the base 250 when the rotor 203 is viewed along the axis AA direction parallel to the axis 700 in the cross section of the rotor 203 including the axis 700 of the rotor 203. The bottom portion 2561 of the blind hole 256 is provided with a recess 2563 provided on the opposite side of the stator 100 so that a convex portion 2331 which is a part of the resin 233 appears adjacent to the bottom portion 2561. The convex portion 2331, which is the resin 233 filled in the concave portion 2563, is covered with the concave portion 2563 and another resin 233, and is provided inside the rotor 203.

In the present embodiment, since the convex portion 2331 which is the resin 233 filled in the blind hole 256 is located inside the rotor 203, the contact between the convex portion 2331 which is the resin 233 in the concave portion 2563 and the outside air is blocked. To. Therefore, the convex portion 2331, which is the resin 233 in the concave portion 2563, is prevented from being easily deteriorated by an environmental substance such as oxygen or the heat of the outside air like the resin 233 exposed on the surface of the rotor 203. It is possible to prevent the holding function of the permanent magnet 211 (the function of restraining the permanent magnet 211 in the direction of the axis 700) from being deteriorated by the continuous use of the rotor 203.

Further, the distance between the inner peripheral side surface 2112 of the permanent magnet 211 and the inner peripheral wall 253 of the groove 252 is formed so as to expand toward the stator 100 side in the axial center 700 direction as in the third embodiment. Therefore, by bringing the resin 233 and the permanent magnet 211 into contact with each other via the inner peripheral side surface 2112 of the permanent magnet 211, the holding function of the permanent magnet 211 of the resin 233 (the function of restraining the permanent magnet 211 in the axial center 700 direction). ) Is being strengthened. That is, the permanent magnet 211 can be held firmly on the base 250 as compared with the case where the inner peripheral side surface of the permanent magnet 211 is provided substantially vertically.

Further, according to the present embodiment, a recess 2563 is provided which communicates with the groove 252 and is filled with the resin 233 by a simple process of providing a plurality of blind holes 256 on the end surface 257 on the anti-stator 100 side of the base 250. It becomes possible. In the present embodiment, one or more blind holes 256 are provided on the end surface 257 of the base 250 on the anti-stator 100 side, but it is preferable that the number of blind holes is large as long as the strength of the base 250 is not impaired. ..

[Fifth Embodiment]
Next, the rotor according to the fifth embodiment of the present invention will be described with reference to the drawings. FIG. 6A is a sectional perspective view in which the shaft 500 is fitted to the rotor 204 according to the fifth embodiment of the present invention, and FIG. 6B is an enlarged sectional view of the rotor 204 according to the fifth embodiment of the present invention. In the rotor 204 (lower side) on the counterload side of FIG. 6A, the resin 234 is omitted so that the shapes inside the permanent magnet 211 and the base 260 can be seen.

The difference between this embodiment and the second embodiment is the shape of the base 260 and the resin 234. Therefore, since the cross section of the motor is substantially the same as that of FIG. 1A, it is omitted, and the description of parts, configurations, etc. that overlap with the second embodiment is omitted in principle.

As shown in FIG. 6A, the rotor 204 according to the present embodiment includes a substantially disk-shaped base 260 and a groove 262 provided on the end surface 261 of the base 260 on the stator 100 side along the circumferential direction of the rotor 204. A permanent magnet 211 having the number of magnetic poles arranged in the groove 262 and a resin 234 for molding and fixing the permanent magnets 211 having the number of magnetic poles in the groove 262 are provided. The base 260 is provided with a groove 262 on the end surface 261 on the stator 100 side along the circumferential direction of the rotor 204.

As shown in FIG. 6B, the groove 262 is composed of an inner peripheral wall 263, an outer peripheral wall 264, and a bottom surface 265. Further, the inner peripheral wall 263 rises at an acute angle with respect to the bottom surface 265, and the portion sandwiched between the inner peripheral wall 263 and the bottom surface 265 forms a recess 2631. At this time, since the recess 2631 only processes the inner peripheral wall 263 at an acute angle with respect to the bottom surface 265, the inner peripheral wall 263 and the bottom surface 265 can be continuously processed by a lathe, and the man-hours can be reduced. Since the outer peripheral wall 264 (small diameter surface 2461 and large diameter surface 2642) has the same configuration as that of the fourth embodiment, the description thereof will be omitted.

The resin 234 is filled in the groove 262 in which the permanent magnet 211 is arranged. That is, the resin 234 is filled between the inner peripheral wall 263 and the inner peripheral side surface 2112 of the permanent magnet 211, between the outer peripheral wall 264 and the outer peripheral side surface 2111 of the permanent magnet 211, and between the permanent magnets 211 adjacent to each other in the circumferential direction. Will be done. The resin 234 filled between the permanent magnets 211 adjacent to each other in the circumferential direction includes the resin 234 filled between the inner peripheral wall 263 and the inner peripheral side surface 2112 of the permanent magnets 211, and the outer peripheral wall 264 and the permanent magnets 211. The resin 234 filled between the outer peripheral side surfaces 2111 is connected.

Further, the recess 2631 is filled with the resin 234 by filling the resin 234 between the inner peripheral wall 263 and the inner peripheral side surface 2112 of the permanent magnet 211. Therefore, the base 260 has a recess 2631 in which the groove 262 and the resin 234 communicate with each other are filled, and a part of the base 260 is on the stator 100 side of the convex portion 2341 which is the resin 234 filled in the recess 2631. The inner peripheral wall 263 is adjacent to the inner peripheral wall 263. That is, the base 260 is a part of the base 260 when the rotor 204 is viewed along the axis AA direction parallel to the axis 700 in the cross section of the rotor 204 including the axis 700 of the rotor 204. On the opposite side of the stator 100 of the inner peripheral wall 263, a recess 2631 is provided so that a convex portion 2341 which is a part of the resin 234 appears adjacently. The convex portion 2341, which is the resin 234 filled in the concave portion 2631, is covered with the concave portion 2631 (inner peripheral wall 243 and the bottom surface 245) and the resin 234, and is provided inside the rotor 204.

In the present embodiment, since the convex portion 2341 which is the resin 234 filled in the concave portion 2631 is located inside the rotor 204, the contact between the convex portion 2341 which is the resin 234 filled in the concave portion 2631 and the outside air is blocked. Will be done. Therefore, the convex portion 2341, which is the resin 234 filled in the concave portion 2631, is prevented from being easily deteriorated by an environmental substance such as oxygen or the heat of the outside air like the resin 234 exposed on the surface of the rotor 204. Therefore, it is possible to prevent the holding function of the permanent magnet 211 (the restraining function of the permanent magnet 211 in the direction of the axis 700) from being lowered due to the continuous use of the rotor 204.

Further, the inner peripheral side surface 2112 of the permanent magnet 211 and the inner peripheral wall 263 of the groove 262 are formed so that the distance from the axial center 700 increases toward the stator 100 side in the axial center 700 direction. Therefore, by bringing the resin 234 and the permanent magnet 211 into contact with each other via the inner peripheral side surface 2112 of the permanent magnet 211, the holding function of the permanent magnet 211 of the resin 234 (the function of restraining the permanent magnet 211 in the axial center 700 direction). ) Is being strengthened. That is, the permanent magnet 211 can be held firmly on the base 260 as compared with the case where the inner peripheral side surface of the permanent magnet 211 is provided substantially vertically. Further, according to the present embodiment, the recess according to the present invention can be provided by a simple process of inclining the inner peripheral wall 263 toward the bottom surface 265 side of the groove 262.

[Sixth Embodiment]
Next, the rotor according to the sixth embodiment of the present invention will be described with reference to the drawings. FIG. 7A is a sectional perspective view in which the shaft 500 is fitted to the rotor 205 according to the sixth embodiment of the present invention, and FIG. 7B is an enlarged sectional view of the rotor 205 according to the sixth embodiment of the present invention. In the rotor 205 (lower side) on the counterload side of FIG. 7A, the resin 235 is omitted so that the shapes inside the permanent magnet 211 and the base 270 can be seen.

The difference between this embodiment and the second embodiment is the shape of the base 270 and the resin 235. Therefore, since the cross section of the motor is substantially the same as that of FIG. 1A, it is omitted, and the description of parts, configurations, etc. that overlap with the second embodiment is omitted in principle.

As shown in FIG. 7A, the rotor 205 according to the present embodiment includes a substantially disk-shaped base 270 and a groove 272 provided on the end surface 271 of the base 270 on the stator 100 side along the circumferential direction of the rotor 205. The head 2771 is separated from the bottom surface 275 in the screw hole 276 formed in the bottom surface 275 of the groove 272 between the permanent magnets 211 having the number of magnetic poles arranged in the groove 272 and the permanent magnets 211 adjacent to each other in the circumferential direction of the base 270. It is provided with a screw 277 screwed in the state of being screwed, and a resin 235 for molding and fixing a permanent magnet 211 having a number of magnetic poles in the groove 272. The base 270 is provided with a groove 272 on the end surface 271 on the stator 100 side along the circumferential direction of the rotor 205.

As shown in FIG. 7B, the groove 272 is composed of an inner peripheral wall 273, an outer peripheral wall 274, and a bottom surface 275. On the bottom surface 275, screw holes 276 are provided between the permanent magnets 211 adjacent to each other in the circumferential direction of the base 270. In the screw hole 276, a screw 277 is screwed so that the head 2771 is separated from the bottom surface 275. Therefore, the body portion 2772 of the screw 277 protrudes from the bottom surface 275, and the recess 2773 is formed by the head portion 2771 and the body portion 2772. Further, the inner peripheral wall 273 is formed on a flat peripheral surface. Further, since the outer peripheral wall 274 (small diameter surface 2741 and large diameter surface 2742) has the same configuration as that of the fourth embodiment, the description thereof will be omitted.

The resin 235 is filled in the groove 272 in which the permanent magnet 211 is arranged. That is, the resin 235 is filled between the inner peripheral wall 273 and the inner peripheral side surface 2112 of the permanent magnet 211, between the outer peripheral wall 274 and the outer peripheral side surface 2111 of the permanent magnet 211, and between the permanent magnets 211 adjacent to each other in the circumferential direction. Will be done. The resin 235 filled between the permanent magnets 211 adjacent to each other in the circumferential direction includes the resin 235 filled between the inner peripheral wall 273 and the inner peripheral side surface 2112 (see FIG. 8A) of the permanent magnets 211 and the outer peripheral wall 274. The resin 235 filled between the permanent magnet 211 and the outer peripheral side surface 2111 (see FIG. 8A) is connected.

Further, by filling the resin 235 between the permanent magnets 211 adjacent to each other in the circumferential direction, the resin 235 is filled in the recess 2773 formed by the head 2771 and the body 2772. Therefore, the base 270 has a recess 2773 that communicates with the groove 272 and is filled with the resin 235, and the axial center 700 of the resin 235 is located on the stator 100 side of the convex portion 2351 which is the resin 235 filled in the recess 2773. Adjacent to the head 2771 of the screw 277, which is part of the base 270 so as to impede movement along the direction. That is, the base 270 is the base 270 when the rotor 205 is viewed along the axis AA direction (see FIG. 7B) parallel to the axis 700 in the cross section of the rotor 205 including the axis 700 of the rotor 205. On the opposite side of the stator 100 in the head portion 2771 of the screw 277, which is a part of the screw 277, a recess 2773 is provided so that a convex portion 2351 which is a part of the resin 235 appears adjacently. Further, the convex portion 2351 is covered with the concave portion 2773 and the resin 235, and is provided inside the rotor 205.

In the present embodiment, since the convex portion 2351 which is the resin 235 filled in the body portion 2772 is located inside the rotor 205, the convex portion 2351 which is the resin 235 filled in the concave portion 2737 and the outside air come into contact with each other. It is blocked. Therefore, the convex portion 2351, which is the resin 235 filled in the concave portion 2773, is prevented from being easily deteriorated by an environmental substance such as oxygen or the heat of the outside air like the resin 235 exposed on the surface of the rotor 205. Therefore, it is possible to prevent the holding function of the permanent magnet 211 (the function of restraining the permanent magnet 211 in the direction of the axis 700) from being deteriorated by the continuous use of the rotor 205.

Further, the inner peripheral side surface 2112 of the permanent magnet 211 (see FIG. 7A) and the inner peripheral wall 273 of the groove 272 are formed so that the distance from the axial center 700 increases toward the stator 100 side in the axial center 700 direction. .. Therefore, by bringing the resin 235 and the permanent magnet 211 into contact with each other via the inner peripheral side surface 2112 of the permanent magnet 211, the holding function of the permanent magnet 211 of the resin 235 (the function of restraining the permanent magnet 211 in the axial center 700 direction). ) Is being strengthened. That is, the permanent magnet 211 can be held firmly on the base 270 as compared with the case where the inner peripheral side surface of the permanent magnet 211 is provided substantially vertically.

Further, according to the present embodiment, the recess 2773 according to the present invention can be provided by a simple structure in which a screw hole is provided in the bottom surface 275 of the base 270 and a screw having a head is screwed.

The inner peripheral wall 273 and the outer peripheral wall 274 of the base 270 may have the same shape as that of the first embodiment. That is, a recess 2231 is formed on the inner peripheral wall 273, the outer wall 274 has a small diameter surface 2241 on the bottom surface 275 side, a large diameter surface 2242 on the stator 100 side, and a recess 2243 between the small diameter surface 2241 and the large diameter surface 2242. It may be formed. This further prevents the resin 235 from coming off from the base 270. Further, the embodiment in which screw holes 276 are provided between the permanent magnets 211 adjacent to each other on the bottom surface 275 of the base 270 in the circumferential direction and screws 277 are screwed into each of the screw holes 276 is shown. There may be one or more 276s. Further, a plurality of screw holes 276 may be provided between the adjacent permanent magnets 211.

[7th Embodiment]
Next, the rotor according to the seventh embodiment of the present invention will be described with reference to the drawings. FIG. 8A is a sectional perspective view in which the shaft 500 is fitted to the rotor 206 according to the seventh embodiment of the present invention, and FIG. 8B is an enlarged sectional view of the rotor 206 according to the seventh embodiment of the present invention. In the rotor 206 (lower side) on the counterload side of FIG. 8A, the resin 236 is omitted so that the shapes inside the permanent magnet 211 and the base 280 can be seen.

The difference between this embodiment and the second embodiment is the shape of the base 280 and the resin 236. Therefore, since the cross section of the motor is substantially the same as that of FIG. 1A, it is omitted, and the description of parts, configurations, etc. that overlap with the second embodiment is omitted in principle.

As shown in FIG. 8A, the rotor 206 according to the present embodiment includes a substantially disk-shaped base 280 and a groove 282 provided on the end surface 281 of the base 280 on the stator 100 side along the circumferential direction of the rotor 206. A through hole 286 provided in the bottom surface 285 of the groove 282 between the permanent magnets 211 having the number of magnetic poles arranged in the groove 282 and the permanent magnets 211 adjacent to each other in the circumferential direction, and the end surface 287 on the anti-stator 100 side of the base 280. It is provided with a counterbore hole 288 that communicates with a through hole 286 that penetrates through the magnet, and a resin 236 that mold-fixes a permanent magnet 211 having a number of magnetic poles in the groove 282. The base 280 is provided with a groove 282 on the end surface 281 on the stator 100 side along the circumferential direction of the rotor 206.

As shown in FIG. 8B, the groove 282 is composed of an inner peripheral wall 283, an outer peripheral wall 284, and a bottom surface 285. The bottom surface 285 is provided with a through hole 286 between the permanent magnets 211 adjacent to each other in the circumferential direction of the base 280. A counterbore hole 288 is provided in the end surface 287 on the anti-stator 100 side of the base 280 of the through hole 286, and a recess 2881 is formed. Further, since the inner peripheral wall 283 and the outer peripheral wall 284 (small diameter surface 2841 and large diameter surface 2842) have the same configuration as that of the sixth embodiment, the description thereof will be omitted.

The resin 236 is filled in the groove 282 in which the permanent magnet 211 is arranged. That is, the resin 236 is filled between the inner peripheral wall 283 and the inner peripheral side surface 2112 of the permanent magnet 211, between the outer peripheral wall 284 and the outer peripheral side surface 2111 of the permanent magnet 211, and between the permanent magnets 211 adjacent to each other in the circumferential direction. Will be done. The resin 236 filled between the permanent magnets 211 adjacent to each other in the circumferential direction includes the resin 236 filled between the inner peripheral wall 283 and the inner peripheral side surface 2112 of the permanent magnets 211, and the outer peripheral wall 284 and the permanent magnets 211. The resin 236 filled between the outer peripheral side surfaces 2111 is connected.

Further, the resin 236 is filled in the through hole 286 and the counterbore hole 288 by filling the resin 236 between the permanent magnets 211 adjacent to each other in the circumferential direction. Therefore, the base 280 has a recess 2881 in which the resin 236 is filled through the groove 282 and the through hole 286, and the convex portion 2361, which is the resin 236 filled in the recess 2881, is on the stator 100 side. The bottom 2882 of the counterbore hole 288, which is a part of the base 280, is adjacent so as to hinder the movement of the resin 236 along the axis 700 direction. That is, the base 280 is the base 280 when the rotor 206 is viewed along the axis AA direction (see FIG. 8B) parallel to the axis 700 in the cross section of the rotor 206 including the axis 700 of the rotor 206. A recess 2881 is provided on the opposite side of the bottom 2882 of the counterbore hole 288, which is a part of the hole 288, so that a convex portion 2361, which is a part of the resin 236, appears adjacently. The convex portion 2361, which is the resin 236 filled in the concave portion 2881, is covered with the side surface 2883, the bottom portion 2882, and the resin 236 of the counterbore hole 288, and is provided inside the rotor 206.

In the present embodiment, since the convex portion 2361 which is the resin 236 filled in the counterbore hole 288 is located inside the rotor 206, the contact between the convex portion 2361 which is the resin 236 in the concave portion 2861 and the outside air is blocked. To. Therefore, the convex portion 2361, which is the resin 236 in the concave portion 2861, is prevented from being easily deteriorated by an environmental substance such as oxygen or the heat of the outside air like the resin 236 exposed on the surface of the rotor 206. It is possible to prevent the holding function of the permanent magnet 211 (the function of restraining the permanent magnet 211 in the direction of the axis 700) from being deteriorated by the continuous use of the rotor 206.

Further, the distance between the inner peripheral side surface 2112 of the permanent magnet 211 (see FIG. 8A) and the inner peripheral wall 283 of the groove 282 is formed so as to expand toward the stator 100 side in the axial 700 direction as in the sixth embodiment. Has been done. Therefore, by bringing the resin 236 and the permanent magnet 211 into contact with each other via the inner peripheral side surface 2112 of the permanent magnet 211, the holding function of the permanent magnet 211 of the resin 236 (the function of restraining the permanent magnet 211 in the axial center 700 direction). ) Is being strengthened. That is, the permanent magnet 211 can be held firmly on the base 280 as compared with the case where the inner peripheral side surface of the permanent magnet 211 is provided substantially vertically. Further, according to the present embodiment, the recess according to the present invention can be provided by a simple process of providing a through hole 286 and a counterbore hole 288 in the base 280.

In this embodiment, an example using a counterbore hole 288 (stepped hole) is shown, but the stator of the resin 236 having a recess that communicates with the groove 282 and is filled with the resin 236 and is filled with the resin 236. A part of the base 280 may be adjacent to the 100 side, and may be a tapered hole, a female screw hole, a hole inclined in the axis 700 direction, or the like.

Further, the inner peripheral wall 283 and the outer peripheral wall 284 of the base 280 may have the same shape as that of the first embodiment. That is, a recess 2231 is formed on the inner peripheral wall 283, the outer wall 284 has a small diameter surface 2241 on the bottom surface 285 side, a large diameter surface 2242 on the stator 100 side, and a recess 2243 between the small diameter surface 2241 and the large diameter surface 2242. It may be formed. This further prevents the resin 236 from coming off from the base 280.

Further, at least one through hole 286 and counterbore hole 288 may be provided between the permanent magnets 211 adjacent to the bottom surface 285 of the base 280 in the circumferential direction.

[8th Embodiment]
Next, the rotor according to the eighth embodiment of the present invention will be described with reference to the drawings. FIG. 9A is a sectional perspective view in which the shaft 500 is fitted to the rotor 207 according to the eighth embodiment of the present invention, and FIG. 9B is an enlarged sectional view of the rotor 207 according to the eighth embodiment of the present invention. In the rotor 207 (lower side) on the counterload side of FIG. 9A, the resin 237 is omitted so that the shapes inside the permanent magnet 211 and the base 290 can be seen.

The difference between this embodiment and the second embodiment is that it has the shape and material of the base 290 and the back yoke 297. Therefore, since the cross section of the motor is substantially the same as that of FIG. 1A, it is omitted, and the description of parts, configurations, etc. that overlap with the second embodiment is omitted in principle. Further, the resin 237 is different from the second embodiment in that it also covers the back yoke 297, but since the shapes are substantially the same, the description thereof is omitted in principle.

As shown in FIG. 9A, the rotor 207 according to the present embodiment includes a substantially disk-shaped base 290, a groove 292 provided on the end surface 291 of the base 290 on the stator 100 side along the circumferential direction of the rotor 207. It includes a permanent magnet 211 having a number of magnetic poles arranged in the groove 292, a small groove 296 provided on the bottom surface 295 of the groove 292 along the circumferential direction of the rotor 207, and a back yoke 297 arranged in the small groove 296. The base 290 is formed of a non-magnetic strength member, and a groove 292 is provided on the end surface 291 on the stator 100 side along the circumferential direction of the rotor 207.

As shown in FIG. 9B, the groove 292 is composed of an inner peripheral wall 293, an outer peripheral wall 294, and a bottom surface 295. The bottom surface 295 is provided with small grooves 296 provided along the circumferential direction. Further, the back yoke 297 is made of a soft magnetic material and is arranged in the small groove 296. Since the inner peripheral wall 293 and the outer peripheral wall 294 of the groove 292 have the same configuration as that of the second embodiment, the description thereof will be omitted.

In the present embodiment, the base 290 is formed of a non-magnetic strength member, and the small groove 296 having a width narrower and a depth shallower than the groove 292 along the circumferential direction of the rotor 207 on the bottom surface 295 of the groove 292 of the base 290. Is provided. Then, after arranging the back yoke 297 made of a low-loss soft magnetic material such as a laminated steel plate or a dust core in the small groove 296, the permanent magnet 211 is arranged in the groove 292 and integrally molded with the resin 237. With this configuration, the eddy current loss of the base 290 can be reduced. Not only can the efficiency of the motor 1000 be improved, but the temperature rise of the rotor 207 can be reduced. Therefore, the temperature of the resin 237 during operation of the motor 1000 can be lowered, and the life of the rotor can be extended. Further, since the back yoke 297 can be fixed to the base 290 by molding and fixing the permanent magnet 211 to the groove 292 of the base 290, it is not necessary to separately provide a component for holding the back yoke 297, and the cost can be suppressed. it can.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

The embodiment of the present invention may have the following aspects. That is, in the above embodiment, an example is shown in which a double rotor type axial gap rotary electric machine is used for the motor 1000 so that the stator 100 is sandwiched between two rotors so as to face each other. However, a so-called single rotor type having one rotor is provided. An axial gap rotary electric motor may be used.

Further, in the above embodiment, the depth of the groove of the base and the thickness of the permanent magnet and the resin are substantially the same so that the end face of the rotor facing the stator 100 is flat, but the present invention is not limited to this. For example, as in the rotor 208 shown in FIG. 10, the thickness of the permanent magnet 213 may be made thinner than the depth of the groove 222 of the base 220 so that the permanent magnet 213 is covered with the resin 238. Further, as in the rotor 209 shown in FIG. 11, the resin 239 and the base 220 that form the end face 2091 of the rotor 209 facing the stator 100 by making the thickness of the permanent magnet 214 thicker than the depth of the groove 222 of the base 220. Of the surfaces of the permanent magnets 214, the surface 2141 of the permanent magnets 214 may be configured to be closest to the stator 100. With this configuration, leakage of magnetic flux emitted from the stator 100 and the permanent magnet 214 can be reduced, and motor output and efficiency can be increased. Although the base 220 is used in FIGS. 10 and 11, it goes without saying that another base may be used.

1000 ... axial gap type motor (motor), 100 ... stator (stator), 200, 201, 202, 203, 204, 205, 206, 207, 208, 209 ... rotor (rotor), 210, 211,212, 213,214 ... Permanent magnet (magnet), 220,240,250,260,270,280,290 ... Base, 222,242,252,262,272,282,292 ... Groove, 223,243,253,263 , 273,283,293 ... Inner peripheral wall, 224,244,254,264,274,284,294 ... Outer wall, 225,245,255,265,275,285,295 ... Bottom surface, 2231,243,2431,441 … Recess, 230, 231,232, 233, 234, 235, 236, 237… Resin, 700… Rotating axis

Claims (14)

1. In an axial gap type rotary electric machine provided with a rotor and a stator arranged to face the rotor via a gap provided along the central axis direction of the rotor.
   The rotor includes a base, a groove provided on the end face of the base on the stator side along the circumferential direction of the rotor, a magnet arranged in the groove, and the magnet in the groove. Equipped with a resin to fix the mold,
   The base has a recess that communicates with the groove and is filled with the resin, and a part of the base is adjacent to the stator side of the resin filled in the recess. Axial gap type rotary electric machine.
2. The axial gap type rotary electric machine according to claim 1.
   An axial gap type rotary electric machine characterized in that the recess is formed on the inner peripheral wall of the groove.
3. The axial gap type rotary electric machine according to claim 1.
   An axial gap type rotary electric machine characterized in that the recess is formed in an annular shape on the entire circumference of the inner peripheral wall of the groove.
4. The axial gap type rotary electric machine according to claim 1.
   An axial gap type rotary electric machine, wherein the recess is a portion sandwiched between a bottom surface of the groove and an inner peripheral wall that rises at an acute angle with respect to the bottom surface.
5. The axial gap type rotary electric machine according to claim 1.
   The recess is formed by a blind hole provided on the end face on the anti-stator side of the base.
   An axial gap type rotary electric machine, wherein the blind hole communicates with the groove through an opening formed in a side wall of the groove.
6. The axial gap type rotary electric machine according to claim 1.
   The axial gap type rotary electric machine is characterized in that the recess is formed by a screw in which a head is screwed into a screw hole formed in the bottom surface of the groove of the base so that the head is separated from the bottom surface. ..
7. The axial gap type rotary electric machine according to claim 1.
   The recess is formed by a counterbore hole provided on the end face on the anti-stator side of the base.
   The axial gap type rotary electric machine, characterized in that the counterbore hole communicates with a through hole provided on the bottom surface of the groove.
8. The axial gap type rotary electric machine according to claim 1.
   An axial gap type rotary electric machine characterized in that the outer inner peripheral wall on the bottom side of the groove and the outer diameter side surface of the magnet are in contact with each other.
9. The axial gap type rotary electric machine according to claim 1.
   An axial gap type rotary electric machine characterized in that the magnet has a ring shape.
10. The axial gap type rotary electric machine according to claim 1.
    An axial gap type rotary electric machine characterized in that a plurality of the magnets are arranged along the circumferential direction of the base.
11. The axial gap type rotary electric machine according to claim 10.
    Each of the magnets is provided with an axial reduction portion in which the length of the base in the circumferential direction is reduced toward the stator side in the axial direction of the base. Type rotary electric machine.
12. The axial gap type rotary electric machine according to claim 1.
    An axial gap type rotary electric machine in which the base is made of a soft magnetic material and the magnets are coupled by magnetic flux.
13. The axial gap type rotary electric machine according to claim 1.
    The base is formed of a non-magnetic strength member,
    An axial gap type rotary electric machine characterized in that a joint iron made of a soft magnetic material is provided between the base and the magnet.
14. The axial gap type rotary electric machine according to claim 1.
    An axial gap type characterized in that the surface of the magnet is closest to the stator among the surfaces of the resin, the base and the magnet forming the surface of the rotor facing the stator. Rotating electric machine.

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