Controller for a brushless direct-current motor
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United States of America Patent
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Oct 10, 2017
Grant Date -
May 14, 2015
app pub date -
Apr 18, 2013
filing date -
Apr 19, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A controller for a brushless direct-current motor having an upstream converter, which has a half-bridge having a pair of switching means for each phase winding of the motor, includes a measuring device or has a signal connection to a measuring device. The measuring device is associated with a half-bridge and by means of the measuring device, the induced voltage, the counterelectromotive force of a phase winding, can be detected for rotor position detection in the current-free state, for which purpose the controller, in an operating mode that causes the braking and in which the switching means cause a short circuit of the phase windings, briefly opens the switching means associated with the measuring device in order to determine a rotor motion.
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