Motor and method of manufacturing the motor

Abstract

The present invention provides a motor and a manufacturing method thereof. The motor has a rotor and a stator, the rotor has a shaft as a rotating shaft, a holding rack and a magnet, wherein the holding rack is configured at the radial outer side of the shaft, and has a hollow holding rack cylinder; a flange part extending from the holding rack cylinder to a radial inner side; and a hub extending upwards in an axial direction from the edge at the radial inner side of the flange part. The shaft is fixed to the hub, the magnet is configured at the radial outer side of the holding rack and has a hollow magnet cylinder, and the holding rack cylinder or the magnet cylinder has a protrusion part protruding along the radial direction, and the holding rack or the magnet has a separation part and an embedding part which are continuous in the axial direction. At the separation part, at least one part of the outer circumferential surface of the holding rack and at least one part of the inner circumferential surface of the magnet are arranged oppositely at intervals in the radial direction, and at the embedding part, the outer circumferential surface of the holding rack and the inner circumferential surface of the magnet are embedded with the help of the protrusion part.

Description

technical field [0001] The present invention relates to a motor and a method of manufacturing the motor. Background technique [0002] Conventionally, a motor in which a rotor having magnets and a shaft is disposed radially inside of an annular stator having a field coil has been widely known. A technique related to a motor is disclosed in JP-A-2001-128436. [0003] The conventional stepping motor described in Japanese Patent Application Laid-Open No. 2001-128436 includes an annular yoke having a field coil, and a rotor assembly including a rotor magnet and a shaft arranged radially inside the yoke. The rotor assembly has a disk-shaped support member interposed between the rotor magnet and the shaft in its radial direction. The support member is fixed to the outer periphery of the shaft and supports the rotor magnet. The radially inner and outer peripheral edges of the supporting member have flanges bent in the axial direction. This structure achieves significant weight ...

AI Technical Summary

Problems solved by technology

[0004] However, in the structure of the conventional stepping motor described in Japanese Patent Application Laid-Open No. 2001-128436, for example, when the rotor assembly is assembled by press-fitting the rotor magnet and the shaft into the support member, the support member may be deformed.

Therefore, there is a problem that it is difficult to fix the rotor magnet to the support member with high precision due to the fear of deformation of the part where the rotor magnet is fixed.

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