Sensorless BEMF measurement in current-controlled brushless motors

摘要

A method for determining a reserve torque in an electronically-switched drive mechanism, specifically a pulse motor for a headlamp beam adjustment system, based upon a parameter in an essentially linear relationship to a back electromotive force of the drive mechanism. Whereby, for the determination of the back electromotive force-related parameter, the variation in the drive current is determined in relation to a change interval.

主权项

1. A method for determining a reserve torque in an electronically-switched drive mechanism based upon a parameter in a generally linear relationship to a back electromotive force of the electronically-switched drive mechanism, which comprises the step of:
determining a current variation in a drive current in relation to a change interval for determining the parameter being a back electromotive force-related parameter.