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Actuators are autonomously controlled levers, cranks, shafts, etc that are driven by a motor. What type...

Actuators are autonomously controlled levers, cranks, shafts, etc that are driven by a motor. What type of motor would you prescribe for an actuator that controls an automatic door operator? Given the selected motor, what type of voltage source would you require and why? Size the appropriate motor for a door actuator that requires a torque of 20Nm. Assume the actuator is a direct-driven application.

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