| 摘要 |
In a spindle motor, a core ( 33 ) includes a plurality of core plates ( 34 ), which are laminated one on another. The core ( 33 ) is constituted by laminating two cores, that is, a first core ( 34 a) and a second core ( 34 b), which are different from each other in shape of a surface facing to a rotor magnet ( 32 ). At least a part of a cogging torque generated at the second core ( 34 b) can be cancelled by a cogging torque generated at the first core ( 34 a).
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