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When we talk about variable speed drives, the first thing that needs a mention here is that there are different kinds of variable speed drives. The names are DC Motor drives, Eddy Current Drives and AC Motor drives. These drive systems that further divided in different variation, but all of them have several things in common. DC Motor Speed Control Systems and the top feature is that that the speed of a DC motor is directly proportional to armature voltage. The top thing to know about this version is that these DC motors are very expensive and all of them have retrofitted with an AC drive motor and AC variable speed drives.

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