Patent ID: 9438158
Filing Date: 2016-09-06
CPC Classification: H02P

Claim Text:
1. A motor control device that generates a q-axis current command and a d-axis current command, and uses the commands to control a synchronous motor having saliency, the motor control device comprising: a calculating unit calculating a speed reference value that takes an initial value when a torque command is zero, and that decreases as the torque command increases; a determining unit determining a magnitude relation between a speed command and the speed reference value calculated for the torque command by the calculating unit; a q-axis-current commanding unit that a d-axis-current commanding unit generating the d-axis current command of commanding a d-axis current to flow to the synchronous motor, on the basis of the q-axis current command generated by the q-axis-current commanding unit; and an inverter configured to supply power to the synchronous motor in accordance with the q-axis-current command and the d-axis-current command, wherein the speed reference value is ω the initial value of the speed reference value when the torque command is zero is ω a change ratio of the speed reference value is k, the torque command is T the calculating unit calculates the speed reference value ω