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Incremental encoder displacement is converted into periodic electrical signals, then converted into electrical signals that count pulse represents the magnitude of displacement by the number of pulses.
The encoder is a device the angular displacement or linear displacement into electrical signals. The former is called code disc, the latter known as the yardstick. In accordance with the readout mode encoder can be divided into contact and non-contact two. Contact output using brush, a brush contact conductive region or insulating region to represent the status code is "1" or "0"; the acceptance of non-contact sensor is a photosensitive element or magnetic element, when using a photosensitive element photic zone and opaque regions to indicate the status code is "1" or "0."
When the incremental encoder shaft rotation, there is a corresponding pulse output, identification and the number of pulses increase and decrease its rotational direction by means of the rear of the sentence to the circuit and counter. The count starting point arbitrarily set, enabling multi-coil unlimited accumulation and measurement. It can also be issued per revolution a pulse signal Z as a reference mechanical zero position. Encoder shaft revolution will output a fixed pulse number of pulses is determined by the number of line encoder grating. When the need to improve the resolution, use 90 degrees out of phase A, B two signals on the original frequency doubling the number of pulses, or replace the high-resolution encoder.