A rotary encoder is a device that converts rotational displacement into electrical signals. Using photoelectric conversion technology, it can convert mechanical quantities like the angular displacement and angular velocity of an output shaft into corresponding digital pulse outputs. Rotary encoders are divided into single-channel output and dual-channel output types. Dual-channel rotary encoders output two sets of pulses with a 90-degree phase difference, which can be used to measure rotational speed and determine the direction of rotation.

In elevators, the main functions of rotary encoders include monitoring elevator speed, achieving closed-loop control, and ensuring precise position tracking.

1. Monitoring Elevator Speed: Rotary encoders detect the rotational speed, and by calculating it, they obtain linear motion data of the elevator car, enabling closed-loop control.
2. Precise Positioning: Rotary encoders record the number of pulses per second and feed this information back to the control panel to confirm the elevator’s position and speed, achieving precise positioning.
3. Overspeed Protection for Ascending: Some elevators use rotary encoders to measure speed, in conjunction with braking devices, to provide overspeed protection when the elevator ascends.

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