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DC Variable Speed Drives - DC Drive Fundamentals

Understanding DC Drives

DC motors have been available for nearly 100 years. In fact the first electric motors were designed and built for operation from direct current power.

Basic DC Motors

Basic DC motors as used on nearly all packaged drives have a very simple performance characteristic the shaft turns at a speed almost directly proportional to the voltage applied to the armature. Figure 1 shows a typical voltage/speed curve for a motor operating from a 115 volt control.