Motor and recording disk drive device provided with the same

Electrical generator or motor structure – Dynamoelectric – Rotary

Reexamination Certificate

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C310S216055, C310S256000

Reexamination Certificate

active

07456540

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

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patent: 6362553 (2002-03-01), Nakahara et al.
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patent: 7352101 (2008-04-01), Fujita
patent: 7382076 (2008-06-01), Miyamori et al.
patent: 2008/0100171 (2008-05-01), Nakajima et al.
patent: H04-251541 (1992-09-01), None
patent: 11-098792 (1999-04-01), None
patent: 2003-047181 (2003-02-01), None

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