Motor drive control

Details Motor drive control Motor drive control

1999-07-16

2000-08-15

Nappi, Robert E.

Electricity: motive power systems

Switched reluctance motor commutation control

31856816, 31856822, 36442405, H02P 706

Patent

active

061041521

ABSTRACT:
A control strategy for a multiple phase brushless motor (1) is disclosed in which the top (2, 3, 4) and the bottom (5, 6, 7) switching devices in two arms of the motor bridge are driven using complementary pulse width modulated waveforms, so that the top device (2, 3, 4) in one of the arms is in the ON state whilst the bottom device (5, 6, 7) is in the OFF state and vice versa. In an alternative arrangement, the control strategy described hereinbefore is used at high motor speeds whilst at low motor speeds a conventional modulation scheme is used in which a top switching device (2, 3, 4) in one arm of the bridge is in the ON state and a bottom device (5, 6, 7) in a different arm of the bridge is pulse width modulated. In another aspect, a method of calculating the position of the motor rotor is disclosed.

REFERENCES:
patent: 5463300 (1995-10-01), Oximberg
patent: 5504403 (1996-04-01), McLaughlin
patent: 5623409 (1997-04-01), Miller

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