Stepping motor actuator with two interposed pole tooth pairs
US4767958A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1987 |
| Grant date | Aug 30, 1988 |
| Priority date | — |
| Expiry date | Jun 19, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A stepping motor suitable as a drive source for driving a head carriage in a magnetic recording/reproducing apparatus for use in an electronic still camera or the like. In the stepping motor, a magnet rotor is formed in the outer circumferential surface with alternately arranged north and south poles, while two excitation coils, which serve as the stator part of the stepping motor, are located such that they embrace the magnet rotor from both axial ends thereof. The two excitation coils are embraced by two yokes, respectively. Each of the yokes is provided with pole teeth, formed so as to cover the circumference of the magnet rotor. A slidable screw parallel to the shaft serves as a linear actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.