VECTOR CONTROL DEVICE, INVERTER INCLUDING THE SAME, INVERTER INCLUDING THE SAME

摘要

Provided is a vector control device that prevents a situation requiring a restart from occurring and can perform a stable torque control operation even when DC voltage fluctuation occurs. A voltage modulation factor calculation unit (11a) of a command calculation unit (11) calculates a voltage modulation factor supplied to a motor, and when the voltage modulation factor (Kh) exceeds a first modulation factor command (Kh1*), a field-weakening control is performed by the operation of a d-axis current modification calculation unit (11b) of the command calculation unit (11). When the voltage modulation factor (Kh) exceeds a second modulation factor command (Kh2*), a torque command modification calculation unit (11c) of the command calculation unit (11) controls a torque command so that the voltage modulation factor (Kh) does not exceed the second modulation factor command (Kh2*). This makes it possible to perform an appropriate field-weakening control and avoid a situation in which an overcurrent trip occurs and a restart is required due to DC voltage fluctuation.