Commutator motor useful for driving automatic washers
US4323831A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1979 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Sep 21, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A commutator motor can be set to different speeds by changing the external circuit connections between the single phase AC supply line and the stator field winding. The field winding is distributed in slots over at least part of the circumference of the stator bore and the field winding connection is switched, when going from a lower to a higher speed, in such a way that the axis of the stator field is rotated in the direction of rotation of the motor. For improved performance, the number of excitation turns may also be changed, simultaneously with the rotation of the field axis. The motor is particularly useful for automatic washing machine drives having a universal motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.