| 摘要 |
A cored motor is composed of a rotor ( 21 ), which is composed of a rotor hub ( 2 ), a shaft ( 1 ) fixed to the rotor hub ( 2 ), a rotor yoke ( 5 ) in ring shape and a ring magnet ( 6 ) fixed to an inner circumferential surface of the rotor yoke ( 5 ), and a stator ( 3 ), which is composed of a motor base ( 13 ) and a stator core ( 14 ) and a sleeve ( 9 ) in cylindrical shape fixed to the motor base ( 13 ) respectively. A surface of the rotor hub ( 2 ) in the motor base side is provided with a recessed portion ( 23 ) in annular shape and a raised portion ( 24 ) that is protruded continuously or intermittently in annular shape. The rotor yoke ( 5 ) is fixed to the recessed portion ( 23 ) and the ring magnet ( 6 ) is contacted with the raised portion ( 24 ) and fixed to the rotor yoke ( 5 ). Respective center lines of the rotor yoke ( 5 ), the ring magnet ( 6 ) and the stator core ( 14 ) in a longitudinal direction along the shaft ( 1 ) are made approximately coincide with each other.
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