| 摘要 |
PROBLEM TO BE SOLVED: To provide an embedded magnet type motor capable of reducing a torque ripple as well as the dropping of a torque. SOLUTION: The embedded magnet type motor is provided with a stator 2 where a coil is wound on a plurality of teeth 7 spaced by constant angles, and a rotor 3 which comprises a rotor core 11 where a plurality of housing holes 13-20 are formed in circumferential direction and a magnetic path formation parts 21-28 extending radially are formed between adjoining housing holes, with a magnet 12 linearly provided in each housing hole in axial direction. The magnetic path formation parts 21-28 are so set that the centers in circumferential direction of adjoining magnetic path formation parts and the center in circumferential direction of the teeth 7 are not in serial state at the same time in each radial direction. In the rotor core 11, first core parts 31 and 33 having a first characteristics where the interval between adjoining magnetic path formation parts is set to be a first prescribed value, and second core parts 32 and 34 having a second characteristics, in almost opposite phase of the first characteristics, where the interval between the adjoining magnetic path formation parts is set to be a prescribed value, are alternately arranged in circumferential direction. COPYRIGHT: (C)2005,JPO&NCIPI
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