Control system for switched reluctance motor operating as a powe

Electricity: motive power systems – Open-loop stepping motor control systems

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318685, 318701, H02P 800

Patent

active

050121723

ABSTRACT:
A method for operating a multi-phase switched reluctance motor is a generator mode includes gating switches connected in series with selected ones of the phase windings of the motor into conduction to establish current flow in a selected one of the windings. The switches are thereafter disabled and current is forced to commutate into flyback diodes whereby the current is returned to an associated DC bus. The instant at which the conducting switches are gated out of conduction is selected or measured in angular displacement between an associated stator pole and a corresponding rotor pole by establishing a preselected magnitude of current such that when the current in the winding reaches that magnitude, the switches are disabled. The voltage at the DC bus is regulated during generator mode operation by adjusting the phase angle measured between a stator pole and a corresponding rotor pole at which the switches are gated into conduction. The voltage is alternatively regulated at the DC bus by adjusting the phase angle at which the switches are disabled if the generated current does not reach the preselected magnitude. Overcurrent protection is included to reduce the turn-on angle if the current in the DC bus exceeds another preselected magnitude.

REFERENCES:
patent: 4682093 (1987-07-01), Murphy et al.
patent: 4707650 (1987-11-01), Bose
patent: 4739240 (1988-04-01), MacMinn et al.
patent: 4769993 (1988-09-01), Kawamura
patent: 4777419 (1988-10-01), Obradoric
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).
J. T. Bass et al.; "Simplified Electronics for Torque Control of Sensorless Switched Reluctance Motor"; IEEE Transactions, vol. 1E-34, No. 2, May 1987, pp. 234-239 (reprinted as pp. 373-378).

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