Formulas and calculators > Coil winding

converting series wound dc motor to pma

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Warpspeed:
Fork lift motors in various sizes are another example of this type of series wound dc motor.
The difficulty will be that these will have a very low relative number of turns on both the armature and the stator.
They are essentially designed to be a low voltage, high current high rpm motor.

If the fixed stator poles (shoes) are replaced with permanent magnets, that would produce a dc generator, but the dc output voltage produced would be extremely low, unless the rpm were kept inconveniently high.  Rewinding the rotor for higher voltage is not going to be practical, and neither would a gearbox or switching power supply to increase the dc output voltage.

At least starting out with a conventional 220v three phase induction motor, the existing windings might be usable, at say one fifth the voltage at about one fifth the original rated rpm. Star connection or a six pole motor would further improve the volts per rpm.

There has already been a lot of work done by some pretty smart people on that type of conversion, and it would be pretty difficult to come up with something completely new or revolutionary along similar lines.

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