Comments on Driving PMSM machine as an AC induction machine
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Driving PMSM machine as an AC induction machine
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Is it possible to drive a PMSM motor - here I am referring to an AC motor with permanent magnets(stator wounded, rotor with PM) - in a way that there is no externally mounted rotor position sensor(no hall, encoder, or resolver) using the scalar VFD method(V/f (Volts per frequency)) as one would typically drive an AC induction machine(stator wounded, rotor squirrel-cage)?
The load that the PMSM motor would drive is a fan(yes, I know the torque-rpm curve of it is nonlinear rather than linear) so there is no stall-torque issue.
If the presented scenario is possible, then the questions are:
- Is the efficiency lower in this scenario in comparison with the one when there is a rotor position sensor(hall, encoder or resolver)?
- How could you control the torque?
- How could you control the RPM?
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