초록 ▼

In a drive circuit for a switched reluctance motor, a DC power supply is provided, a plurality of main circuit switching devices cause branched currents from a current derived from the DC power supply to flow through stator windings of the switched reluctance motor sequentially during their turned o

In a drive circuit for a switched reluctance motor, a DC power supply is provided, a plurality of main circuit switching devices cause branched currents from a current derived from the DC power supply to flow through stator windings of the switched reluctance motor sequentially during their turned on states; a plurality of freewheel diodes are provided, each connected across a corresponding one of the main circuit switching devices in a reverse parallel connection; a plurality of reverse flow blocking diodes are provided, each cathode of which is connected to an output end of the corresponding one of the main circuit switching devices; a resonance purpose capacitor is provided whose one end is connected to a plus terminal of the DC power supply via a resistor and whose other end is connected to an anode of each reverse flow blocking diode; a serial circuit is connected across the resonance purpose capacitor and is constituted by a resonance purpose inductor and a resonance purpose switching device for causing the resonance purpose inductor and capacitor to be resonated when turned on at a time point at which it comes near an end of a turn on interval of time of each main circuit switching device; and a bypass diode is provided whose anode is connected to a minus terminal of the DC power supply and whose cathode is connected to the one end of the resonance purpose capacitor.

대표청구항 ▼

[ What is claimed is:] [1.] A drive circuit for a switched reluctance motor, comprising:a DC power supply;a plurality of main circuit switching devices for causing branched currents from a current derived from the DC power supply to flow through stator windings of the switched reluctance motor seque

[ What is claimed is:] [1.] A drive circuit for a switched reluctance motor, comprising:a DC power supply;a plurality of main circuit switching devices for causing branched currents from a current derived from the DC power supply to flow through stator windings of the switched reluctance motor sequentially during their turned on states;a plurality of freewheel diodes each connected across a corresponding one of the main circuit switching devices in a reverse parallel connection;a plurality of reverse flow blocking diodes, each cathode of which is connected to an output end of the corresponding one of the main circuit switching devices;a resonance purpose capacitor whose one end is connected to a plus terminal of the DC power supply via a resistor of a given resistance value and whose other end is connected to an anode of each reverse flow blocking diode;a serial circuit connected across the resonance purpose capacitor and which is constituted by a resonance purpose inductor and a resonance purpose switching device for causing the resonance purpose inductor and capacitor to beresonated when turned on at a time point at which it comes near an end of a turn on interval of time of each main circuit switching device; anda bypass diode whose anode is connected to a minus terminal of the DC power supply and whose cathode is connected to the one end of the resonance purpose capacitor.