Synchronous or stepping motor with equal-torque stepping
US4672247A · kind A · utility
32Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Dec 31, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A hybrid stepper motor having two alternately excited magnetic systems, one providing positions of 0.degree. and 180.degree., and the other positions of 90.degree. and 270.degree.. To minimize position offset due to unequal flux through the two air gaps of the unexcited system, a nonmagnetic space is provided to reduce the relative difference in reluctance between the magnetic paths which include the two air gaps of the unexcited magnetic system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.