In a DC shunt motor, the armature and field (shunt) windings are connected in parallel. A parallel circuit is also known as a shunt circuit; thus, the term, “shunt motor” is used. In contrast, for a series-wound DC motor, torque increases as the square of armature current.
Why is a shunt motor called a constant speed motor?
The field winding in shunt motor is connected in parallel to the armature winding and the supply. If we assume that the supply voltage is constant then flux also becomes constant. At the rated speed the back emf also becomes nearly constant if the load is same.
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