Two-phase motor, particularly a time piece motor or a motor for driving the hand of a display
US6043574A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1997 |
| Grant date | Mar 28, 2000 |
| Priority date | — |
| Expiry date | Oct 2, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R7/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A two-phase motor formed by a stator part excited by electric coils and a magnetized rotor. The rotor has N pairs of poles which are radially magnetized in alternate directions, N being equal to 3 or 5. The stator part has at least two W-shaped circuits comprising each an electric coil surrounding the central leg. The "W" circuits are so arranged that when one of the central legs faces a magnetic transition, the other central leg faces a magnetic pole. The polar opening outs of the legs of a "W" circuit are angularly spaced by .pi./4. The polar opening outs of the central legs of the two "W" circuits belonging to different phases are angularly spaced apart by an angle which is substantially equal to .pi./2.+-.k..pi./N, where N is the number of pairs of magnetic poles, that is 3 or 5, and k is equal to 0, 1 or 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.