What they do:
Motor Drives are electrical devices that convert AC supply voltage into variable DC (Direct Current) in order to control both the torque and speed of a servo motor.
Primary types and how they work:
DC Drives are typically available in ratings from 5 to 600 HP, with voltage ratings that vary proportionately with input reference. They provide constant torque operation to base speed. Above base speed, the motor field current is weakened to provide a constant horsepower output. The device is the main building block for high performance engineered drive systems.
