| 摘要 |
PURPOSE:To perform a constant magnetic flux by obtaining a current in rotary coordinates, calculating a terminal voltage with an exciting voltage set value proportional with the current and a set frequency and a motor primary resistance set value, and controlling an inverter with the calculated voltage as a voltage command signal. CONSTITUTION:Currents i1alpha, i1beta in rotary coordinates are calculated by a formula I with induction motor currents iu, iw detection signals, a terminal voltage V1 synchronizing signal and a voltage angular velocity omega, the voltage V1 is calculated by a formula II with the calculated currents i1alpha, i1beta signals, an exciting voltage E set value proportional to a set frequency and a motor primary resistance R1 set value, and an inverter is controlled with the calculated voltage V1 as a voltage command signal. Accordingly, the inverter outputs the voltage V1 to become an exciting voltage proportional to the frequency. Thus, an induction motor 4 can be speed-controlled with constant magnetic flux. |
