The dc shunt motor has a speed regulation of 5-10%, and hence, it is used for constant-speed drives like pumps, blowers, fans, etc. Though induction motors are preferable in these applications, the dc shunt motor is cheaper for low-speed drives. When the driven load requires a wide range of speed control, both below and above-rated speed, a dc shunt motor is employed, e.g. in lathes and other machining Tools. These motors are widely used in steel and aluminum rolling mills and the Ward Leonard speed control system.
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