3 phase induction motor drive

Thread Starter


Joined Feb 26, 2010
howzit guys, I am designing a three phase pwm inverter to control a three phase induction motor, this must be done manually so no microcontrollers and pwm ic's. I am using spwm method, so i need to generate a three phase sine wave and compare it to a triangular wave through a comparator. I have attached some results from my cct but i can only get a sine wave at 0 degree's, how do i get the sine waveforms for 120 and 240 degrees.?