Patent ID: 8791716

Claim:
An anomaly detector of a permanent magnet synchronous electric motor, comprising: a plurality of permanent magnet synchronous electric motors; a current command value calculator for calculating current command values relative to the plurality of the permanent magnet synchronous electric motors; q-axis voltage command value calculators for calculating each of q-axis voltage command values relative to the plurality of the permanent magnet synchronous electric motors based on the current command values each calculated by the current command value calculator; and a magnet temperature anomaly determiner for determining whether or not an anomaly of a magnet temperature is caused to at least any one of the permanent magnet synchronous electric motors, the determining operation being implemented by using a difference between: a q-axis voltage command value which is calculated by one of the q-axis voltage command value calculators and is relative to one permanent magnet synchronous electric motor of the plurality of the permanent magnet synchronous electric motors, and a q-axis voltage command value which is calculated by another of the q-axis voltage command value calculators and is relative to another permanent magnet synchronous electric motor of the plurality of the permanent magnet synchronous electric motors.