andy pugh wrote: > It will probably start from rest, certainly with a soft-starting VFD, > and will run synchronously. > However, running synchronously the phase lead will depend only on > load, and will be very small. The field will be almost 100% direct and > zero quadrature. > The effect of this is (I think) that the back-emf is very small, and > the current very high, for a given torque. > HUH? On a permanent magnet motor, the back EMF is determined entirely by the magnets, and will be the same with or without driving current. The BEMF will be exactly proportional to RPM. That's not the case with an induction motor, of course.
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