Whenever an operation requires speed regulation characteristics unavailable in series or shunt motors, compound wound motors perform well. With medial starting torque capability, between 180 and 260% of full load, they deliver constant operating speeds under any percentage of full load.
This characteristic is a result of placing part of the field circuit in series with that of the armature. When under load, increased series winding current raises the level of field flux. Enlarged field flux in compound wound motors yields greater reduction in speed than in a shunt motor.
The compound wound DC motor comprises both series and shunt windings. The shunt winding connects in parallel with armature and series windings. Some associated applications include punch presses, shears, crushers, and reciprocating compressors.
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