Control device for voltage type pulse width modulation inverter

摘要: In case an induction motor is controlled by a voltage type PWM inverter, reduction of electromagnetic noise made without enlarging device. By providing integrator 8 for obtaining inverter phase angle integrating frequency command and carrier modulator 9 modulating so as to raise modulation signal only certain in the center every 60 degrees angle, magnetic flux vector can be brought closer locus circle reduce more than that conventional one.