Hello,
I'm trying to find a way to get maximum torque per amp out of an IPM (interior permanent motor). I do have a resolver mounted on the motor, but as the optimal angle changes with current (and possibly speed), one would traditionally need a lookup table mapping an optimal angle for each current value.
I was wondering, if by switching from sensored (resolver) into sensorless at non-zero RPM (using sensor only for startup) would automatically guarantee that the angle is optimal in the whole operation range (back EMF)?
If this is the case, the implication could be that one could construct a lookup table just by loading the motor, while logging the angle of the FAST vs angle of the resolver for different loads - thus getting a table "for free" without actually having an intelligent load (dynamo test).
The only relevant thread I've found for this is here: e2e.ti.com/.../413962
But it relies on knowing Ld and Lq using other methods - as instaspin considers them to be equal.
Thanks!