| 摘要 |
PROBLEM TO BE SOLVED: To increase a compensation accuracy of dead time compensation by conducting dead time compensation which is not based on the detection of a zero cross point. SOLUTION: After inputting an output current detected value of an inverter circuit (step 1), a current component id of magnetic flux and a current component ig of torque are calculated (step 2), to find out a phase angle θ of a current vector in a static coordinate system (step 3). A range of θ is determined (steps 4-9) to find out a compensation voltage vector, and then a compensation voltage signal is output based on the compensation voltage vector (step 10). |
