I was planning to use the opto-coupler speed sensor as part of a motor speed control – making the motor into the VCO block in a phase-locked ... emf is largely (entirely?) due to dc resistance in the ...

The PID controller has been in use ... diagram of such a system. The motor is driven by a voltage that is commanded by software. The motor output is geared down to drive the actual mechanism. The ...

These two last variables are DC or slowly varying values which can be regulated by mean of simple PI controller. They are then finally transformed back to the fixed AC 3-phase frame (the stator ...