AC drive with optimized torque
US5113125A · kind A · utility
38Cited by
8References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 1, 1991 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | May 1, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Apparatus to extend the speed range and maximize torque of an ac drive by optimizing the torque angle as a function of speed. Using the back-emf of the machine, or the voltage from a permanent magnet generator mounted on the mtor shaft for reference, a novel analog biasing arrangement of a fast tracking multi-phase phase locked loop generates a set of stator current reference signals having a phase angle which is programmed to provide the optimum torque angle at any speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.