Torque motor
Brushless torque motors are available; elimination of commutators and brushes allows higher speed operation.They differ from other motors in their higher torque, thermal performance, and ability to operate while drawing high current in a stalled state.If the engine starts to slow down relative to the desired speed, the current will be increased, the motor will develop more torque, pulling against the return spring and opening the throttle.Should the engine run too fast, the governor will reduce the current being applied to the motor, causing the return spring to pull back and close the throttle.Actuators are hardware devices that converts the controller command signal into a change in a physical parameters.