| 摘要 |
PROBLEM TO BE SOLVED: To improve current control performance when an excitation current command value is changed, by specifying an interference item optimized relating to a torque shaft component in a current control part. SOLUTION: Based on a deviation of a torque current command value and an excitation current command value, respective torque current feedback value and excitation feedback value, an interference amount in an induction motor is added/subtracted, torque shaft voltage and excitation shaft voltage are calculated. Here, an interference item B' from a current control part 16 to a torque shaft is constituted so as to generate B'=ω0 L1 +(1/(1+sT2 )-1).(M<2> /L2 ). Where, the formula represents ω0 : power source angle frequency, L1 : primary inductance, L2 : secondary inductance, M: excitation inductance, T2 : secondary time constant (L2 /R2 ,R2 : secondary resistance). In this way, a current characteristic at the time changing an excitation current command Id can be improved. |
