| 发明名称 |
Disk drive device with vibration reduction of second order rocking-mode resonance |
| 摘要 |
In a brushless motor, the rotational frequency N (Hz) of the hub satisfies N<F0/(3*P+2), where F0 (Hz) is an Eigen frequency of the second order rocking-mode resonance when not rotating in the situation where the recording disk is mounted on the hub. The recording disk is mounted on the hub. A base plate rotatably supports the hub. A laminated core is fixed to the base. The core has a ring portion and a plurality of teeth that extend radially from the ring portion. Coils are wound around the plurality of teeth. The coils are three-phase driven. A cylindrical magnet is fixed to the hub. The cylindrical magnet are magnetized for driving with P (P is a natural number) poles along the circumferential direction and are arranged to radially face the plurality of teeth. |
| 申请公布号 |
US8213113(B2) |
申请公布日期 |
2012.07.03 |
| 申请号 |
US20090572020 |
申请日期 |
2009.10.01 |
| 申请人 |
WATANABE TAKANORI;IWAI HIROSHI;HASHIMOTO ISAMU;ALPHANA TECHNOLOGY CO. LTD. |
发明人 |
WATANABE TAKANORI;IWAI HIROSHI;HASHIMOTO ISAMU |
| 分类号 |
G11B17/02;H02K21/02 |
主分类号 |
G11B17/02 |
| 代理机构 |
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