by Mike Rycroft, Energize

Although AC motors are commonly used in industry, a significant sector exists where DC motors offer advantages over AC units. Modern power electronics has simplified and improved the control systems and drives used for DC motors and could lead to a wider usage of these units in industry.

DC motors have been used in variable speed drives for many years. The versatile characteristics of these motors provide high starting torque, which is required for traction applications. Controlling the speed of a DC motor – below and above the rated speed – is easier and less expensive than for alternating current (AC) motors...

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