Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1989-05-09
1990-06-12
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 318701, H02P 800
Patent
active
049336207
ABSTRACT:
A method and apparatus for improving the operation of a switched reluctance motor at low speed incorporates an advance angle regulator which regulates the firing angle of current pulses to the switched reluctance motor so that over a wide range of speeds and levels for direct current source voltages, the winding current reaches a commanded set point at a commanded angle. The advance angle regulator may comprise a closed loop regulator which includes apparatus for detecting the actual angular position at which motor current reaches a commanded level and adjusts the turn-on angle to shift the angle at which current reaches its desired level to a desired angle. The regulator incorporates a feedforward portion and an integral portion. The feedforward portion is utilized primarily to accommodate situations in which there is no current feedback. The integral portion provides the primary regulation when current is regulated to its desired value. The regulator causes the torque versus current command to have a transfer function which does not depend upon speed or DC source voltage over a wide range of speed, voltage and torque.
REFERENCES:
patent: 4253053 (1981-02-01), Ray et al.
patent: 4707650 (1987-11-01), Bose
patent: 4739240 (1988-04-01), MacMinn et al.
B. K. Bose et al.; "Microcomputer Control of Switched Reluctance Motor"; IEEE Transactions on Industry Applications; Jul./Aug. 1986, pp. 708-715.
J. T. Bass et al.; "Robust Torque Control of Switched-Reluctance Motors Without a Shaft-Position Sensor"; Aug. 1986; pp. 212-216 (IEEE Transactions on Industrial Electronics).
MacMinn Stephen R.
Sember James W.
Bergmann Saul M.
General Electric Company
Renner Arnold E.
Shoop Jr. William M.
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