Lars Andersson wrote: > My thought was to not run PWM but only direct switching at a base frequency > of a few kHz and without any sensing of rotor angle. > The rotor will run well once it is locked in to the rotating field from the > stator. Crude, but it works. > Old drives use a 6-step drive scheme and varied the voltage input to the 3-phase bridge stage with a buck regulator. So, that was generally a 7-transistor output stage, with one big inductor for the buck regulator. These were used on both induction motor and PM motors.
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