| 摘要 |
A demagnetizing detection apparatus of a permanent magnet motor for a hybrid electric vehicles and its method are provided to increase the power intensity of an auxiliary driving device by sensing demagnetization without an additional a voltage sensor and a voltage meter. A D-Q axis current command value calculation unit(41) calculates a D-Q axis current command value on a synchronous frame based on the torque command, the speed of an electric motor, and the voltage of the high voltage battery. A Q-axis voltage model(42) extracts Q axis voltage estimation value by using the D-Q axis current command value, and a voltage output unit(43) outputs Q axis reference value of the voltage by using the difference of Q axis current measurement and Q axis current command value. A demagnetization judgment part(44) determines the demagnetization of the permanent magnet of the electric motor by using the difference of Q-axis reference value of voltage and Q-axis voltage estimation value. |
