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CONVENTIONAL AND SOLID STATE SPEED CONTROL OF D.C DRIVES
· The speed of a given machine (DC) has to be controlled for the required speed variations of an operation.
· Either armature voltage or field current can be varied or controlled. A separately excited motor is a versatile variable speed motor. The speed control using the variation of the armature voltage can be used for constant torque application in the speed range from zero to base or rated speed.
· The speed control using the field weakening can be used for constant power application in the speed range from zero to above base or rated speed.
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