MOTOR CONTROL DEVICE

PROBLEM TO BE SOLVED: To solve such a problem that, as a current-detection method for motor control, if a multi-point synchronous current is detected and set as a moving average signal, a delay of (N-1)/2 times a moving average period occurs in a detection value due to the use of past data. SOLUTION: In a spatial vector modulation method using a two-axis voltage command spatial vector, the two-axis voltage command spatial vector is converted into a three-phase voltage command value to output it to a detection current delay compensation part. In the detection current delay compensation part, the three-phase voltage command value is compared with a carrier signal whose phase is sequentially advanced, to calculate a predicted gate signal. A current component is calculated at each prediction point changing due to a PWM voltage in a control period, by applying the control period, an induced electromotive force of a motor, and an inductance of the motor to the predicted gate signal. A moving average signal is calculated by the calculated current component and a motor current sequentially delayed from the present output from an A/D converter to make the moving average signal as a detection current. COPYRIGHT: (C)2011,JPO&INPIT