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A motor circle with a feedback element attached.
Also known as: Servo motor, Closed-loop motor, Motor with feedback, Servo
A servomotor is a motor with a position or speed sensor and a closed control loop, and the symbol shows the feedback device attached because that is what makes it a servo rather than a motor. Unlike a stepper it detects and corrects its own errors.
Denotes a servomotor: a motor operating within a closed feedback loop using an attached position or velocity sensor.
Contexts: Electrical equipment
Is drawn with its feedback element shown, which is what distinguishes the symbol from a plain motor.
Contexts: Electrical equipment
Detects and corrects position error, unlike an open-loop stepper, at the cost of a sensor and a controller.
Contexts: Electrical equipment
A circle marked with the letter M joined by a shaft line to a second smaller circle or rectangle representing the feedback sensor.