I've been researching making a driver for a 3 phase induction motor powered by DC source using PWM to approximate sine waves in each phase.
However, the switching speeds of the PWM signal for the rotational speed I want is difficult to obtain with hobby microcontroller boards like the arduino.
Can I just switch the DC directly thru each phase at the correct time only twice per cycle ? Essentially I would be approximating a sine wave with only 2 different voltages thru the coils, ie: +V and -V (using H bridge circuitry here)
Will this create enough of a rotating magnetic field that sufficient current is induced in the rotor cage ?
What will be the losses in power / efficiency for this, or any other drawbacks for this system ?
The bonus is greatly simplified drive electronics.