On the nameplate of the motor is a Delta/Wye-Wye configuration, meaning you supply the ones (U1, V1, W1) and leave the twos open to achieve the slow speed. And for fast speed you supply the twos and bridge the ones... That's for a constant torque single winding pole changing motor. Surprisingly, today I connected this motor without bridging anything and it ran on both speeds just fine.
So the question is why do we need to bridge the ones in the fast speed? Does this also have an effect on the output torque in the fast speed?
Any information on this will be appreciated.