Patent ID: 8269441
Filing Date: 2012-09-18
Classification: H02M,H02P,Y02P

Abstract:
1. A motor control apparatus comprising: a current control unit configured to calculate dq-axis voltage commands in a dq coordinate system based on a motor magnetic pole position to match a d-axis current command and a q-axis current command obtained based on a torque command with a d-axis current and a q-axis current of a motor current, respectively; a power conversion circuit configured to drive the motor based on the dq-axis voltage commands; a modulation factor command unit configured to determine a modulation factor command based on the dq-axis voltage commands and a direct current bus voltage of the power conversion circuit; a modulation wave command unit configured to determine modulation wave commands using the modulation factor command; a pulse width modulation generating unit configured to generate a pulse width modulation pattern based on the modulation wave commands and a pulse width modulation carrier signal; a modulation factor saturation level calculating unit configured to determine a modulation factor saturation level based on the modulation factor command and a limit value; and a field-weakening control unit configured to correct the d-axis current command based on the modulation factor saturation level.