Bemf zero-crossing detection system of a multiple-phase motor

Details Bemf zero-crossing detection system of a multiple-phase motor Bemf zero-crossing detection system of a multiple-phase motor

1997-07-31

1999-06-01

Ip, Paul

Electricity: motive power systems

Switched reluctance motor commutation control

318590, 318591, G05B 501, H02P 540

Patent

active

059090952

ABSTRACT:
The invention relates to a method for detecting a threshold-crossing of a back electromotive force (bemf) measured in one phase of a multiple-phase motor, the one phase being set at a high impedance while at least one other phase is supplied by pulse-width modulation signal. The method includes the step of comparing the bemf with a threshold. The method includes, prior to the step of comparing, the steps of sampling the bemf during on-periods of the pulse-width modulation signal, and holding the bemf during off-periods of the pulse-width modulation signal.

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