Patent ID: 9595897
Date: 2017-03-14
CPC Classifications: H02P

Claim:
1. A motor control device for controlling a three-phase AC motor by using dq-three-phase coordinate conversion, the motor control device comprising: a phase correction amount calculation unit for calculating a phase correction amount by using a detected motor speed and a q-axis current command initial value, which is a value obtained by dividing the torque command by the torque constant; a rotor phase angle correction unit for adding or subtracting the phase correction amount to or from a detected rotor phase angle of the motor to calculate a corrected rotor phase angle; and a coordinate conversion unit for performing coordinate conversion between parameters on a dq coordinate system and parameters on a three-phase coordinate system on a basis of the corrected rotor phase angle, wherein the phase correction amount calculation unit comprises a storage unit for storing a speed coefficient N where N represents the motor speed; a current correction term calculation unit for calculating a current correction term on a basis of: where T an output unit for outputting, as the phase correction amount, a value obtained by multiplying the speed correction term and the current correction term together.