Electric motor with permanent magnet rotor
US4518883A · kind A · utility
12Cited by
9References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1983 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | Aug 3, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The motor according to the invention comprises a disc-shaped rotor with multipolar permanent magnetization along an annular area and a stator comprising a plurality of magnetic circuits (9, 10, . . . ) arranged so that the magnetic field is comprised within the two cylindrical face portions based on the magnetized annular area and located on either side of the rotor. Means for compensation of the harmonics of the current-free torque and of the current torque are provided, as well as the arrangement of magnetic pick-ups (25, 26). The invention applies to industrial synchronous motor which may operate as stepping motors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.