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A DC motor is an electric motor that turns on the application of a DC current.

A DC Servo motor is similar but it produces a DC current from a mechanic movement of the armateur or may also produce small movement from the application of low current..

An example of a servo motor is as was used in steering gears and auto pilots. The physical turning of the wheel either caused a current to flow or caused an inbalance in the electrical systems, this causes a counter action to restore the original position.

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