Transistor drive circuit and control for a switched reluctance motor
US5900712A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1998 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Feb 20, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/092
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low cost switched reluctance motor drive circuit is achieved by establishing an alternate supply bus which effectively extends the voltage range of the DC supply for the drive. The alternate bus is maintained at a voltage which is either higher or lower than the supply voltage. A first capacitor is connected in parallel with the supply voltage and a second capacitor is connected between the alternate bus and one terminal of the supply voltage. At least one of the motor phase windings is connected in parallel with the first capacitor and at least one other of the phase windings is connected in parallel with the second capacitor. The phase winding(s) drawing energy from the first capacitor return inductive current to the second capacitor, and the phase winding(s) drawing energy from the second capacitor return inductive current to the first capacitor. A voltage regulation control ensures that the alternate bus voltage is maintained at a desired value so that the full supply voltage is available for energizing each of the phase windings. In a preferred embodiment, one or more of the free-wheeling diodes are replaced with a power transistor so that the respective phase winding may be…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.