Patent ID: 7952309

Claim:
A rotating electrical machine control device comprising: an inverter that performs electric power conversion between a primary side DC power supply and a rotating electrical machine; a resolver that generates a rotation detection signal corresponding to a rotation angle of the rotating electrical machine; a unit that calculates the rotation angle and a rotational speed based on the rotation detection signal; a three-phase/two-phase modulation switching unit that uses a target torque, the rotational speed and the rotation angle of the rotating electrical machine in order to control the inverter such that an output torque of the rotating electrical machine becomes the target torque and switches a control of the inverter from three-phase modulation to two-phase modulation when a modulation ratio, which is a ratio of a voltage applied to the rotating electrical machine with respect to a voltage input to the inverter, becomes greater than a three-phase/two-phase modulation switching boundary; and a motor control unit that switches to the two-phase modulation in a specific region where an electric noise given to the resolver by the rotating electrical machine is large, even in a region where the modulation ratio is smaller than the three-phase/two-phase modulation switching boundary.