| 摘要 |
PURPOSE:To improve control stability and control performance on transition by steadily matching the reference magnetic flux axis of control to the vertical magnetic flux axis inside a motor. CONSTITUTION:The primary current of an induction motor fed via a power converter which can control the level, frequency, and phase of an output voltage is separated into the components in the magnetic flux axis direction of the motor (excitation current) and components (torque current) crossing them and the components are controlled independently. A voltage compensation circuit 9 is provided for obtaining the deviation between a command value i1d* of excitation current and a detection value i1d and then multiplying it by a gain K1 for calculating the amount of voltage compensation. The amount of voltage compensation is added at the input side of a component V1d* in magnetic flux axis direction of a primary voltage vector command value v* of an induction motor 2 to compensate V1d*. |
