Apparatus for regulating magnetic flux in an AC motor
US4011489A · kind A · utility
24Cited by
9References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1974 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Nov 20, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/72
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A flux sensing coil is installed in each phase of the motor stator, and the resulting induced voltages represent the rate of change of air gap flux in that phase. The output voltage signals are integrated, rectified and summed to obtain an average motor flux signal which is in turn applied to vary the voltage to the motor in such a manner as to maintain a substantially constant motor flux level. In this way control errors due to motor parameter changes are eliminated and the flux margin normally required in motor design is reduced to achieve a more efficient utilization of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.