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### Application Of Rotary Encoder

• Publish Time: 2019-04-04
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Application Of Rotary Encoder
Encoders are widely used in situations requiring precise positioning and speed, such as machine tools, robots, motor feedback systems and measurement and control equipment.

Application of Encoder

1. Angle measurement
In driving simulator, photoelectric encoder is used as sensor to measure the rotation angle of steering wheel. Gravity measuring instrument uses photoelectric encoder to connect its rotating axis with compensating knob axis in gravimeter. Torsion angle measuring instrument uses encoder to measure the change of torsion angle, such as torsion testing machine, fishing rod torsion fishing ability testing, etc. The pendulum impact test machine calculates the change of the pendulum angle by using the encoder.

2. Length measurement
The meter uses the circumference of the roller to measure the length and distance of the object. The length and distance of the object are measured by the circumference of the winding wheel. Coupling direct measurement, and drive linear displacement of the power device spindle coupling, through the output pulse number measurement. Medium detection transmits linear displacement information in straight racks, sprockets of rotating chains, synchronous pulleys, etc.

3. Velocity measurement
Linear speed is measured by connecting with instrument, and angular speed is measured by encoder.

4. Position measurement
For machine tools, the coordinate positions of each coordinate point of machine tools, such as drilling machine, are memorized; for automatic control, the designated actions are controlled in the pastoral position. Such as elevators, elevators, etc.

5. Synchronization control
Through angular speed or linear speed, the transmission link is synchronously controlled to achieve tension control.
General applications of incremental encoders:
Velocity measurement, rotation direction measurement, moving angle measurement, distance measurement (relative).
Classification, Definition, Use and Application of Encoders

1. Absolute Encoder (Rotary)

Absolute encoder CD has many optical channel lines, each line in turn 2, 4, 8, 16 lines... Arrangement, in this way, at each position of the encoder, by reading the pass and dark of each line, a unique set of binary codes (Gray codes) from the zeroth power of 2 to the N-1 power of 2 is obtained, which is called n-bit absolute encoder. The encoder is determined by the mechanical position of the photoelectric code disc, which is not affected by the power outage interference.
The absolute encoder is unique in every position determined by the mechanical position. It does not need to memorize, find reference points, and count all the time. It needs to know the position whenever it needs to, and read its position whenever it needs to. In this way, the anti-interference characteristics of the encoder and the reliability of the data are greatly improved.

2. From single-loop absolute value encoder to multi-loop absolute value encoder
Rotating single-circle absolute value encoder can measure the markings of the photoelectric code disc in rotation to obtain the unique coding. When the rotation exceeds 360 degrees, the coding returns to the origin. This does not conform to the principle of absolute coding uniqueness. Such coding can only be used for measuring within 360 degrees of rotation, which is called single-circle absolute value encoder.
If you want to measure rotation beyond 360 degrees, you need to use multi-loop absolute value encoder.
Encoder manufacturer uses the principle of clock gear machinery. When the center code disc rotates, it drives another set of code discs (or more sets of gears, multiple sets of code discs) through gears, and adds the encoding of cycles on the basis of single-loop encoding to expand the measurement range of the encoder. Such absolute encoder is called multi-loop absolute encoder, which is also determined by the mechanical position. Each location code is uniquely non-repetitive and does not require memory.
Another advantage of multi-loop encoder is that the measurement range is large and the actual use is often more affluent. In this way, it is not necessary to bother to find zero point when installing, and a certain middle position can be used as the starting point, which greatly simplifies the difficulty of installation and debugging.
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