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D.C. DRIVES

 

DC drives control the speed of DC motor. They consist SCR (Silicon Controlled Rectifier) link which is responsible for converting incoming three or single-phase AC volts to DC volts.
With the help of armature voltage and field current which corresponds to a motor's measured speed, the DC drives regulate the current conditions, voltage, speed and torque of the DC motor. These drives are suitable for industrial processes such as paper machines, extruders, tube mills, mixers and various other controlled applications.
There are various ranges of DC drives such as non-regenerative DC drives which are the most standard type in common usage and normally they are able to control the speed of motor and torque in one direction only.
Regenerative DC Drives are adjustable speed drives also known as four-quadrant drives and they are competent of controlling the speed and direction of motor rotation as also the direction of motor torque.
The power conversion of a DC drive is called the converter Type DC drives. The exclusive uniqueness of the various converter types DC drives used in standard industrial applications has distinct authority in the design of well-matched DC motors.
Specific applications require continuous horsepower over a specific speed range. Since an armature voltage controlled DC drive has constant torque uniqueness, the drive has to be extra-large sized to handle such applications.
Thyristor DC Drives consist of all indispensable electronic power and control circuits are effectively used in areas that need a regulated heat atmosphere. These drives consist of a current limit circuit which restricts the current to exceed the premeditated value and are designed to facilitate furnace manufacturers and automation of industrial plants.