Incremental encoder (encoder type selection) is the displacement into periodic electrical signal, then change the electrical signals into counting pulses, pulse number indicate the size of the displacement.
Incremental encoder works:
Uniform grating engraved on the shaft to rotate together with the pulse encoder on the code disk evenly distributed in a number of light transmission section and blackout zone. Incremental encoder is no fixed starting zero, the output is proportional to the pulse increment corner, the counter needs to count the number of pulses. Each turned a light transmission area, it sends a pulse signal, the current value of the counter is incremented, increment the counting result corresponds to the corner. The encoder is the angular displacement or linear displacement into electrical signals a device.
The former becomes encoder, which said the yardstick. Readout method according to the encoder can be divided into touch and non-touch two. Touch selection brush output, a brush touch conductive or insulating zone area to indicate the status of the code is "1" is still "0"; a non-touch-sensitive element is subjected to a photosensitive element or magnetic components, the selection of the photosensitive member In the photic zone and opaque regions to indicate the status of the code is "1" is still "0."
Incremental encoder features:
Incremental encoder (electronic handwheel) color is: a non-touch, non-conflict and wear, small size, light weight, compact organization, convenient device to protect the simple, drive torque, which has a high-precision, large range measurement , fast response, digitized output characteristics;
Very appropriate incremental encoder measurement speed, unlimited accumulation measure. But the existence of zero cumulative error, poor immunity, receiving equipment downtime required to power the memories, power should give change or see bits and other questions, such as the selection of these questions will certainly be able to handle encoder.
Built-in battery Skills: Some encoder built-in battery power is lost to prevent signal, there are some encoder (electronic handwheel) ring is certainly signal, the number of signals and multi-circle is built-in battery and circuitry incremental counting method to get, this is a pseudo-affirmative encoder, its battery life expectancy by, low battery failure, vibration factor affected by poor battery contacts, etc., and greatly reduced reliability.
General application speed incremental encoder measuring rotational direction, moving angle measured from the (relative). The encoder according to the measurement selection first asked to select the type of encoder, incremental encoder pulses per revolution is equal to the number of lines issued its grating. Speed measurement shall be based on the design or location requirement, and the encoder speed, to determine the number of lines of the encoder. The encoder mounted on the motor shaft or mounted on a shaft decelerated, encoder speed is quite different. It should also consider whether the maximum frequency of the pulses within it emits a high-speed counter in the PLC allows.
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