Incremental encoder and absolute encoder selection difference！

Encoder, such as the signal principle is divided into incremental encoder and absolute encoder two kinds, they are speed control or position control system detection components, many users in the encoder selection, do not know what kind of more Suitable for their own detection system, this paper on the difference between the two under a brief introduction.
Incremental encoder
Incremental encoder rotation, there is a corresponding pulse output, the rotation direction of the increase and decrease in the number of judgments and pulses with the help of the rear phase circuit and counter to achieve.
The counting points can be arbitrarily set, and can achieve multi-turn infinite accumulation and measurement. Can also send a pulse per revolution Z signal, as a reference mechanical zero.
When the pulse number has been fixed, and the need to improve the resolution, can be used 90 ° phase difference A, B two-way signal to the original pulse frequency.
Order incremental encoder, please specify the selected model, the number of pulses per revolution, power supply voltage, outlet mode, signal output mode, and pay attention to the selected model of the mechanical installation size can meet your requirements.
The number of pulses per revolution should be selected according to the following formula.
Number of output pulses per revolution (P / r) = 360 ° / design resolution
When selecting the signal output mode, be sure to match the rear circuit. If the long-term driver output mode is selected, select a matching receiver for the rear circuit to accept.
Absolute Encoder
Absolute encoder rotation, there is a one-to-one correspondence with the code (binary, BCD code, etc.) output. From the code size changes, you can determine the positive and negative direction and displacement of the location, without phase detection circuit.
Absolute encoder has an absolute zero code, when the power failure or shutdown, the boot remeasure, you can still accurately read out the location of power or shutdown code, and accurately find the zero code.
When ordering absolute encoders, note the serial number and number of divisions (or digits) in addition to the model number.
The number of divisions (or digits) is selected. Can refer to the following formula:
Split number = 360 ° / design resolution
The output system and output mode of the selected absolute encoder correspond to the user's post processing circuit.
In general, absolute encoders measure from 0 ° to 360 °, but special versions can also be used for multi-turn measurements.

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