Patent ID: 9331620
Filing Date: 2016-05-03
CPC Classification: H02P

Claim Text:
1. An electric motor control device configured to perform a voltage phase control by changing a voltage phase command value depending on a target torque, comprising: a d-q axis voltage generator configured to calculate a d-axis voltage command value and a q-axis voltage command value based on the voltage phase command value and a voltage vector norm command value; a stabilization filter that includes first to fourth filters determined based on a transfer characteristic of the electric motor from an applied voltage to an output electric current and that is configured to generate a final d-axis voltage command value and a final q-axis voltage command value by removing resonance characteristics in a d-axis electric current and a q-axis electric current for the d-axis voltage command value and the q-axis voltage command value; and a voltage application unit configured to apply an alternating-current voltage to the electric motor based on the final d-axis voltage command value and the final q-axis voltage command value, wherein the stabilization filter is configured to generate the final d-axis voltage command value based on a result obtained by performing filtering by using the first and second filters for each of the d-axis voltage command value and the q-axis voltage command value and generate the final q-axis voltage command value based on a result obtained by performing filtering by using the third and fourth filters for each of the d-axis voltage command value and the q-axis voltage command value.