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Answer Posted / kalirajan.n
system, a prime mover drives a direct current (DC) generator
at a constant speed. The armature of the DC generator is
connected directly to the armature of a DC motor. The DC
motor drives the load equipment at an adjustable speed. The
motor speed is adjusted by adjusting the output voltage of
the generator using a rheostat to adjust the excitation
current in the field winding. The motor field current is
usually not adjusted, but the motor field is sometimes
reduced to increase the speed above the base speed. The
prime mover is usually an alternating current (AC) motor,
but a DC motor or an engine might be used instead. To
provide the DC field excitation power supply, Ward Leonard
systems usually include an exciter generator that is driven
by the prime mover.[3][
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