Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. 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 ? Will this create enough of a rotating magnetic field that sufficient current is induced in the rotor cage ? By your description, are you not then driving the coils with a square wave of period matching the cycle? Yes - my problem is with the pwm frequency of the arduino - it's only enough to give me about 8 points of approximation per cycle. You say you can't get a PWM frequency fast enough to produce a reasonable sine wave, but that is hard to believe.
As you are controlling it with software, there is nothing to stop you using PWM at low speed, and switching to direct (square wave) drive at high speed. You may be considering a simple 3phase AC inverter design or a powerful high torque variable frequency drive (VFD) electronics. Not the answer you're looking for?Browse other questions tagged three-phase induction-motor or ask your own question. Is there a way to force "Yes" to any prompts when installing from apt-get (from a bash script)? Is there a case (besides light speed in any given medium) where speed is experimentally measured rather than theoretically calculated?

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The FreeMotion Tour de France bike individually calibrates the power display for precision readouts. In both cases, a square wave would not be desireable as the eddy current losses would be excessive so multi-level low impedance drive is needed to appropximate the sine wave.
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