CONTROLLER FOR A BRUSHLESS DIRECT-CURRENT MOTOR

摘要

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.

主权项

1. A controller for a brushless DC motor with upstream converter, said controller comprising:
a half-bridge with a pair of switches for each phase winding of the brushless DC motor, wherein each pair of switches comprises a first switch and a second switch; wherein the controller one of (i) comprises a measuring device and (ii) has a signal connection to measuring device; wherein the measuring device is assigned to one of the half-bridge pairs of switches, and wherein the measuring device is operable to detect the induced voltage to determine rotor position of a rotor of the motor; and wherein, when in a motor braking mode where the first switches of the half-bridge pairs of switches effect a short-circuit of the phase windings, the first switch of the one of the half-bridge pairs of switches is temporarily opened by the controller to determine rotor movement of the rotor.