Patent ID: 8188702

Claim:
A rotating electrical machine control system, comprising: a frequency converting portion that is interposed between a rotating electrical machine for driving a vehicle and a DC power source for supplying electric power to the rotating electrical machine, and that converts an output of the DC power source to an AC output at least during a powering operation of the rotating electrical machine; a voltage converting portion that is interposed between the DC power source and the frequency converting portion, and that boosts the output of the DC power source based on a boost command value which is set according to a target torque and a rotational speed of the rotating electrical machine; and a control portion for controlling the frequency converting portion and the voltage converting portion, wherein when the control portion performs a control to shift a control state from non-boost control, in which the output of the DC power source is supplied to the frequency converting portion through the voltage converting portion without being boosted, to boost control, in which the output of the DC power source is boosted by the voltage converting portion and then supplied to the frequency converting portion, on a condition that the target torque and the rotational speed of the rotating electrical machine exceed a predetermined shift boundary which is set based on a correlation between the target torque and the rotational speed of the rotating electrical machine, boostable electric power, which is electric power obtained by subtracting increased electric power transiently produced during the shifting, from allowable electric power output from the DC power source, is used as reference electric power, and the shift boundary is set in a region where power consumption of the rotating electrical machine is equal to or lower than the boostable electric power.