Discuss the shunt field power supply.
What will be an ideal response?
Most solid-state DC motor controllers provide a separate DC power supply, which is used to furnish excitation current to the shunt field. The shunt field of most industrial motors requires a current of only a few amperes to excite the field magnets; therefore, a small power supply can be used to fulfill this need. The shunt field power supply is generally designed to remain turned on even when the main (armature) power supply is turned off. If power is connected to the shunt field even when the motor is not operating, the shunt field will act as a small resistance heater for the motor. This heat helps prevent moisture from forming in the motor due to condensation.
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