Patent ID: 6828702
Filing Date: 2004-12-07
Classification: H02K,H02P

Abstract:
A brushless direct-current drive, comprising:a synchronous motor (10) having a stator (12) that supports a multi-phase stator winding (15) and a rotor (13) with permanent magnet poles (20), wherein the permanent magnet poles generate a magnetic flux that penetrates the stator winding (15); a switch unit (11), which precedes the stator winding (15) and is controlled by an electronic control unit (18), for commutating the stator winding (15), wherein the rotor (13) contains a field excitation winding (21); a circuit breaker (32), where said circuit breaker is connected between a common terminal (30) and the switch unit (11); and a controller (25), wherein said controller, in the event of a malfunction, triggers the circuit breaker (32) so that it opens, wherein said controller applies an excitation current to the field excitation winding (21) so that it generates a magnetic flux oriented in an opposite direction from the magnetic flux of the permanent magnet poles (20).