Stepper_vs_DC_and_other_actuators - Considerations and...

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Considerations and Tradeoffs between Stepper Motors and DC Motors Stepper Motors DC Motor Advantages Advantages Simple, open loop control (just count steps!) Low cost Simple construction Rugged No maintenance (brushless) High reliability Inherently failsafe (no runaway) Automatic braking High continuous torque at low speeds High speed capable Higher torque at high speed Torque speed curve more linear Better dynamic response Smoothness of motion No maintenance (for brushless) More efficient Disadvantages Disadvantages Care needed in acceleration and deceleration to avoid missing steps Relatively low speed (<3 kRPM) Not smooth Tend to run hot (some windings are always energized) May jump 1 step after power on Encoder or resolver needed to control position (adds complexity and cost) Cost Not smooth Control is more complicated Brush types are electrically noise Not inherently failsafe (if encoder
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This note was uploaded on 09/08/2010 for the course EE 106 at San Jose State University .

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Stepper_vs_DC_and_other_actuators - Considerations and...

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