Electric machine with continuous pole phase modulation
US4489265A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1983 |
| Grant date | Dec 18, 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 phase modulated rotary electric machine is provided with a uniformly slotted stator structure and a main stator winding which spans the entire stator periphery. A control stator winding is wound in selected slots of the stator structure and the average phase change between adjacent slots of the stator structure is controlled by controlling the phase angle of current supplied to the control winding using a rotary magnetic induction phase shifter, an isolated variable reactance load, or a switching arrangement which varies the current amplitude and magnetic field axis of the controlled winding. Pole phase modulation provides a continuously variable magnetic speed control of induction type electrical machines operating at a fixed power frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.