Starter procedure for permanent magnet motors
US4808893A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1986 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Nov 6, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A procedure for stopping and starting a D.C. ferrite toroid motor so as to ensure that the rotor always rotates in the correct direction on starting. The windings in the stator are arranged in a plurality of circuits. Upon opening of the power switch to the motor, activation of one of the stator circuits only results in magnetic poles which attract the rotor poles, thereby slowing and stopping the rotor. Upon activation of the other of the stator circuits, an attractive stator pole is established ahead of a rotor pole and a repulsive stator pole is established behind the rotor pole, thereby ensuring rotation in the desired direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.