DETECTING FAULTS IN FIELD ORIENTED CONTROLLED PERMANENT MAGNET SYNCHRONOUS MACHINES

摘要

In a fault detection circuit, a threshold detector circuit has: first and second inputs adapted to be respectively coupled to first and second rotor reference frame current outputs of a regulator circuit; and an amplitude magnitude output. A signal detector has: an input coupled to the amplitude magnitude output; and a detection output. A comparator has: a first input coupled to the detection output; a second input coupled to an amplitude threshold node; and a comparator output. The comparator is configured to: compare a signal at the detection output to a signal at the amplitude threshold node; and responsive to that comparison, output a comparison signal at the comparator output. The comparison signal is indicative of whether a permanent magnet motor fault exists. A signal at the first rotor reference frame current output has a D-axis current value, and a signal at the second rotor reference frame current output has a Q-axis current value. The signal at the detection output has a value equal to a magnitude of the D-axis current divided by a sum of magnitudes of the D-axis current and the Q-axis current.