Synchronous motor with sinusodial torque variation in each phase
US4891538A · kind A · utility
7Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1988 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Jun 24, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In synchronous electric motors of the type having a movable multipolar permanent magnet member and a stator comprising magnetic circuits coupled to a control coil. The magnetic circuits form an air-gap of variable height in which the permanent magnet member is movably arranged. The improvement defines the height of the air-gap as a function of the position of the movable member, taking into account various design parameters of the motor, in order to obtain a purely sinusoidal variation of the torque produced in each phase of the motor by a constant control current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.