| US 7,576,954 B2 | ||
| Symmetric voice coil motor design, assembly methods of constructing same, and hard disk micro drive storage systems including same | ||
| Liding Wei, DongGuan (China); and Yihua Pei, DongGuan (China) | ||
| Assigned to SAE Magnetics H.K. Ltd., Hong Kong (China) | ||
| Filed on Feb. 16, 2006, as Appl. No. 11/355,083. | ||
| Prior Publication US 2007/0188930 A1, Aug. 16, 2007 | ||
| Int. Cl. G11B 5/55 (2006.01) | ||
| U.S. Cl. 360—265 [360/264.8; 360/264.9] | 21 Claims |
| 1. A voice coil motor assembly having a central axis comprising:
(a) a bearing assembly for rotation about the central axis;
(b) a coil assembly that is positioned radially outwardly from the bearing assembly and that comprises (i) at least two pairs
of coils and (ii) an inner yoke, wherein the coils are assembled together with the inner yoke so that the coils and the inner
yoke can rotate together; and
(c) a permanent magnet set that is positioned radially outwardly from the coil assembly and that comprises (i) at least two
pairs of ring magnets and (ii) an outer yoke,
wherein the coil assembly further comprises an air gap between the at least two pairs of coil and the inner yoke, and
wherein the air gap is less than 0.4 mm.
|