Electrical motor
US4424471A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1982 |
| Grant date | Jan 3, 1984 |
| Priority date | — |
| Expiry date | Mar 1, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical motor comprises a rotor (2) carrying a plurality of permanent magnetic poles (6), a stator (4) carrying at least two main windings (22,23) which, when activated interact with the magnetic fields generated by the poles (6) to drive the rotor (2), search windings (25,26) on the stator associated with each of the main windings and arranged to interact with the magnetic field generated by the poles, and switches (T.sub.1, T.sub.2, R.sub.4, C) for each main winding (22,23) operable by the search windings (25,26) to activate the main windings for different periods so that the rotor always starts to rotate in the same direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.