| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric motor having a simple structure in which the reliability in assembling a rotor is improved. SOLUTION: In an inner rotor type motor to be used for a motor-driven sliding door of an automobile, a rotor portion 3 to be inserted into a circular armature and rotatably supported by a bearing mechanism 4 via a shaft 31 has a field magnet 33 on the external side surface of a rotor core 32 and a magnet 34 for a sensor on the upper surface. The rotor core 32 has a plurality of through holes 323 between coupling portions 324 each for coupling a magnet holding portion 321 and a shaft fixing portion 322, and engaging portions 342 protruding below the magnet 34 for sensor fit to the through holes 323 and thus, the magnet 34 for sensor is engaged with the rotor core 32. In this way, the reliability of the rotor portion 3 is improved with a simple structure. A recessed portion 325 is provided on the lower surface of the rotor core 32, the through holes 323 and the recessed portion 325 reduce moment of inertia of the rotor core 32, and responsive characteristics of rotation is improved. COPYRIGHT: (C)2009,JPO&INPIT
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