Symmetrical coil actuator for a magnetic disk drive
US4620252A · kind A · utility
25Cited by
11References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1982 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | Nov 9, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K41/0358
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An actuator for a magnetic disk drive includes a planar coil which is symmetrical with respect to the center of rotation and has substantially straight active sections extending from the center of rotation on opposite sides of the center of rotation. Four permanent magnets provide a magnetic field. When current is applied to the planar coil, magnetic forces rotate the coil, and an attached actuator arm, about the center of rotation. The symmetrical coil sections eliminate or reduce torsional forces thereby avoiding vibration, improving bearing life and reducing potential servo loop instability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.