Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1998-02-20
1999-05-04
Salata, Jonathan
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318254, H02P 528
Patent
active
059007125
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 selectively connected in parallel with either of the first and second capacitors for purposes of regulating the voltage of the alternate bus. In this case, a selected one of the transistors is controlled to energize the phase winding, and the other transistor performs the function of a free-wheeling diode.
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A Modified C-Dump Converter for Variable-Reluctance Machines; A. M. Hava; 1992 IEEE--pp. 1017-1021
Disser Robert John
Mescher Patrick Allen
General Motors Corporation
Salata Jonathan
Sigler Robert M.
Simon Anthony L.
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