| 摘要 |
PURPOSE:To suppress the irregular torque of an AC motor and to improve the responsiveness of the motor by calculating the primary current instruction value by considering the secondary leakage reactance and controlling the motor on the basis of the calculated value. CONSTITUTION:Torque instruction T is obtained by a torque generator TQG from the speed deviation DELTAn between a speed instruction nC and an actual speed (n), then torque vs. slip frequency is obtained by considering the secondary leakage reactance in advance, and slip frequency vs. primary current vector is obtained, and a slip frequency omegas is obtained by a slip frequency generator SG with the relationship between the torque instruction T and the torque vs. slip frequency. The amplitude I1 and the phase phi1 of the primary current are obtained by an amplitude and phase generator CG. On the other hand, angular frequency omegan is detected in response to the actual rotation speed, the primary current instructions iu, iv, iw are calculated by a primary current calculator ACG with the values omegas, omegan, phi1, and the AC motor is driven on the basis of the instruction value, and DC excitation current is flowed through the stator coil. |
