Speed control device of induction motor drive inverter

摘要

The present invention relates to a speed control device for an induction motor drive inverter, and more particularly to a speed control device for a drive inverter for an induction motor that can reduce the speed pulsation by suppressing harmonic components of the induction motor, and switching operation according to the speed command. In the speed control device of a drive inverter for driving a motor by performing a step, a compensation current generating unit for outputting a compensation current to compensate for torque pulsation by receiving the speed of the motor, the final current by combining the current command and the compensation current; It is configured to include a second subtractor that outputs a command, and the motor speed is analyzed through a fast Fourier transform to perform frequency analysis, which is a frequency pulsation existing at a frequency equal to an integer multiple of the power frequency, that is, the power frequency, Velocity pulsation due to the DC offset present at twice the frequency of power frequency By compensating for the speed pulsation due to the dead time existing at the frequency of 6 times, the compensating current is generated and output so that the inverter can drive the motor according to the manpower current command.