Electrical Projects Compound Motors. These are dc motors which have field windings that are both in series and in parallel. Consider a motor in which the field coils have been wound so that the magnetic flux from the shunt field opposes the flux from the series field. This is called a differential-compound motor, and is characterized by nearly constant speed, regardless of reasonable load. A cumulative-compound motor, is where the series and shunt windings are wound so that the magnetic fields are additive. A motor with a cumulative-compound configuration has very strong starting torque, but poor speed regulation, and is used where speed regulation is not necessary but where great torque is required for starting and to overcome sudden application of heavy loads.

You probably won't be able to tell the difference between a cumulative-compound motor and a differential-compound motor unless there is a plate on the motor or a portion of the manual for the appliance which will tell you.





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November 20, 2008