Erik Christiansen wrote: > But with a little dead-time between one being turned off and the other > on. So H-bridge drivers with hardware dead-time would be needed where > only three signals are provided. (AIUI) > You can't drive a 3-phase motor with only high and low drive in six step mode. It needs one bridge to be open-circuit. If you are driving it with a PWM sinewave scheme, then you could drive with only 3 wires. This requires the PWM amplitude relationships to change gradually as the motor rotates, so the bldc component needs to know absolute rotor position. This is the tricky part, until the encoder passes the index mark, or you use the Hall signals, you don't really know the absolute rotor position.
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