Low cost, variable speed, constant torque induction motor drive
US4259620A · kind A · utility
17Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1978 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | Oct 18, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P27/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low cost, small rating AC motor drive includes an inverter in which static controlled switches are in two sets associated with opposite poles and controlled in such a way that current continuously fed is sensed relative to one set for feedback current sensing and that the switch current is modulated in the other set in order to regulate the motor current. When starting, or overloaded, the motor drive speed is automatically reduced under air gap motor sensing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.