| 摘要 |
Induction voltage command Em* is obtained from inverter's primary frequency command omega1* and torque boost voltage commander produces torque boost voltage command DeltaVz* in accordance with omega1* while integrator produces reference phase command thetad*. uvw/dq converter detects motor excitation current Id (equivalent of no-load current). Next, deviation of excitation current limitation level command Idmax* and detected Id is inputted to limiter processing unit to produce torque boost voltage compensation value DeltaVc for varying DeltaVz* so that Id is smaller than or equal to Idmax*. Inverted DeltaVz* is set up as a lower limiter value of the limiter processing unit. Next, DeltaVc and DeltaVz* are added to produce final compensated torque boost voltage command DeltaVt* and DeltaVt* and Em* are added to produce q-axis voltage command Vq* of the inverter output voltage.
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