Patent ID: 7999499

Claim:
A rotating electrical machine control system comprising: a rotating electrical machine that drives a vehicle; a frequency conversion portion provided between a DC power supply and the rotating electrical machine, the frequency conversion portion converts an output of the DC power supply to alternating current when the rotating electrical machine performs power running and converts an output from the rotating electrical machine to direct current when the rotating electrical machine performs regeneration; a voltage conversion portion provided between the DC power supply and the frequency conversion portion, the voltage conversion portion increases a voltage of the output of the DC power supply based on a boost command value set in accordance with a requested torque requested for the rotating electrical machine; a torque limitation portion that limits a torque of the rotating electrical machine; and an abnormality detection portion that detects an abnormality requiring the voltage conversion portion to be stopped, wherein when the abnormality detection portion has detected the abnormality: the torque limitation portion limits generation of a positive torque in a region of less than a rotational speed lower limit threshold value where a rotational speed of the rotating electrical machine is less than zero, and sets a region in which the positive torque is generated to a region of the rotational speed lower limit threshold value or greater, and the torque limitation portion limits generation of a negative torque in a region of greater than a rotational speed upper limit threshold value where the rotational speed of the rotating electrical machine is greater than zero, and sets a region in which the negative torque is generated to a region of the rotational speed upper limit threshold value or less.