Low profile motor powered disk assembly for a recording/reproducing device
US5528436A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1994 |
| Grant date | Jun 18, 1996 |
| Priority date | — |
| Expiry date | Jun 3, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A low profile memory disk assembly includes a disk spindle motor, which is mounted in a housing, such as a thin, flat memory cassette housing. A hub of the disk spindle motor rotor mounts at least one disk. The hub also has a peripheral surface which mounts a permanent magnet ring. The housing has a recess bounded by thicker housing regions. The recess has a flat base. A salient pole stator for the motor is mounted to the flat base of the recess in a semicircular recess portion of the recess adjacent to the thicker housing sections to be stiffened or reinforced thereby. The motor rotor is journaled to the base within and concentric to the salient pole stator. The peripheral surface of the permanent magnetic ring defines radial gaps with the tips of the radially disposed salient poles of the salient pole stator. Radially magnetized, alternately poled, equally circumferentially spaced, permanent magnet poles in the permanent magnet ring, different in number from the number of salient poles of the salient pole stator, produce permanent magnet fields which interact with the electromagnetic fields of the salient poles to produce rotation of the motor rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.