How are encoders controlled?！

Encoders are controlled through the rotation the shaft it is mounted to. The shaft comes into contact with a hub which is in internal to the encoder. As the shaft rotates, it causes the disc, with both transparent and solid lines, to rotate across the circuitry of the encoder. The circuitry of the encoder contains an LED which is captured by a photoelectric diode and outputs pulses to the user. The speed at which the disc rotates will be dependent on the speed of the shaft the encoder is connected to. Anaheim Automation's optical and magnetic encoder lines are powered from a single +5VDC power source, and is able to sing and source 8mA each.

Linear Encoders

The key components of a linear encoder are a scanning unit, sensor, transducer or readhead, paired with a transmissive or reflective scale, which encodes position. The scale of a linear encoder is generally made of glass and mounted to a support and the scanning unit contains a light source, photocells, and a second glass piece called the scanning reticle. Collectively, the linear encoder is able to convert motion into digital or analog signals to determine the change in position over time.

Rotary Encoders

The key components of a rotary encoder are the disk, light sources and detectors, and electronics. The disk contains a unique pattern of concentric etched circles and alternates between opaque and transparent segments. This pattern provides unique bit configurations and is used to assign specific positions. For every concentric ring in a rotary encoder, there is a light source and light detector which identify lines etched on the disk. The electronics consist of an output device which takes the signal obtained from the sensor (light/detector source) to provide feedback of position and/or velocity. All of these components are enclosed in a single housing unit.

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