Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1990-06-21
1991-07-02
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
318138, H02P 602
Patent
active
050288520
ABSTRACT:
The present method and apparatus detects the rotor position of a brushless DC motor with an accuracy of .pi./m electrical radians (where m=the number of motor phases) within one electrical period, and provides enough information to enable starting the motor in the correct direction with certainty. After starting the motor in an open loop mode of one or two steps, a closed loop mode may be switched on, using a dynamic indirect position detection as is already well known in the technology. More specifically, the position at start is determined by the injection of short current pulses in different motor phases, each phase or pair of phases being energized first by a pulse of one polarity and of the opposite polarity. The sign of the time difference between the rise times of the induced voltages is detected. By performing a succession of these tests on different phases or pairs of phases of the standing motor, a table of results is established which clearly defines the position of the rotor relative to the motor phases. The same table then defines what polarity currents should be applied to each phase to reliably and certainly start the motor in the proper direction.
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P. P. Acarnley et al., "Detection of Rotor Position in Stepping and Switched Motors by Monitoring of Current Waneforms", IEEE Transactions on Industrial Electronics, vol. IE-32, No. 3, Aug. 1985.
Ro Bentsu
Seagate Technology Inc.
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