Control circuit for switched reluctance motor

Details Control circuit for switched reluctance motor Control circuit for switched reluctance motor

1990-08-10

1991-05-14

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Hysteresis or reluctance motor systems

H02P 540

Patent

active

050159399

ABSTRACT:
A motor control circuit for a switched reluctance motor which includes a rotor and a plurality of stator coils, and a driver circuit for energizing the coils in sequence, includes a current sensing resistor for detecting a signal proportional to the current in the coils and a slope detector for detecting the rate of change of the current signal with respect to time over predetermined time intervals during which the voltage in the coils is dominated by a term representing back EMF. A variable oscillator is responsive to an integrated output of the slope detector for generating a timing signal for the driver circuit. When the voltage across the coils is dominated by the back EMF term, the current should be substantially constant, but when the rotor is out of phase with the driver circuit, the current signal during this time has a substantially linear slope which is either positive or negative depending upon whether the rotor is leading or lagging the driver circuit.

REFERENCES:
patent: 3368128 (1968-02-01), Parrish
patent: 4520302 (1985-05-01), Hill et al.
patent: 4595865 (1986-06-01), Jahns
patent: 4933620 (1990-06-01), MacMinn et al.

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