Continuous pole amplitude modulated electric machines
US4477760A · kind A · utility
28Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1983 |
| Grant date | Oct 16, 1984 |
| Priority date | — |
| Expiry date | Mar 24, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pole amplitude modulated electric machine is operated at continuously variable speeds between fixed limits by a control circuit which rapidly switches the stator winding between the upper and lower pole number configurations. The switching is controlled such that the stator winding remains in each configuration for a time which exceeds the cycle time of an external power source but is less than the combined magnetization-rotor loop time constant of the machine. Phase control of the switching can be used to control speed in the vicinity of the fixed limits. In all cases, the input power frequency remains constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.