| 摘要 |
PURPOSE:To reduce the pulsating torque of an AC motor by separating a torque current from the motor current, controlling the current amplitude so as to become the reverse function of the pulsating waveform and compensating the phase error of the fundamental component of the motor current. CONSTITUTION:An induction motor 4 is driven by a power reactor 1 and a power inverter 3 made of thyristors. A torque command and a magnetic flux command are applied to a DC machine control circuit 7, the output omegaS of which is inputted to a magnetic flux phase angle calculator 8, Id, Iq are inputted to a motor driven amplitude and phase instruction calculator 10, the oututs are added to control the inverter 3, the reactor 1 is further controlled by the output of the calculator 10, thereby controlling he amplitude and phase of the motor current. Accordingly, the current amplitude is controlled so as to become reversely proportional to the pulsation of the current of the torque generated component, and the pulsating torque can be largely reduced by applying correct phase command by considering the phase change at that time. |
