How is a rotary encoder defined? How does it work and how does it work?

Many friends do not know what the encoder is, specifically the working principle and the way it works is not very well understood, has been more curious, I hope to get to know, the following Vacuz simple to introduce it to you! Hope it can help everyone!

Especially in these years, various printing, packaging precision machinery, electronic equipment, elevators, auto parts and other industries develop at a high speed, in which the encoder plays a certain role, and the application is more and more extensive.

1. How is the definition of rotary encoder?

Rotary encoder is to convert the actual parameter value of the machine into electrical signal, and the electrical signal is processed to detect the speed and direction position of the equipment, which is a kind of sensor. In fact, it is quite understandable, for example, it can detect angle, length, displacement, speed, etc., and then convert the actual parameters into electrical signals that can be processed by counters, tachometers, and PLCs.

2. Working mode of rotary encoder

Circular, dark engraved line, photoelectric transmitter and receiver reading center of photoelectric code plate has axis. Four groups of sine wave signals are combined to form A, B, C and D. Each group of sine wave and C and D signals are superimposed in the reverse direction and differ by 90 degrees (360 degrees compared to one cycle), and each time the Z phase pulse is rotated, it indicates the 0-bit reference bit.

Since the phase difference between A and B is 90 degrees, by comparing the leading edge of phase A or the leading edge of phase B, the forward and reverse direction of the encoder can be determined, and the 0-bit reference bit of the encoder can be obtained by the 0-bit pulse.

3.Encoder material

Encoder discs are made of glass, metal and plastic. The glass disk is a thin plate on glass with good thermal stability and high accuracy. The metal disk is not easy to break through, but the metal has a certain thickness, so the accuracy is limited. Its thermal stability is an order of magnitude worse than glass, and the plastic disk is economical.

4. Encoder resolution

Resolution – The path or dark angle line provided by the encoder for each 360 degree turn is called resolution, also called resolution division or direct number line (usually 5 ~ 10000 lines per turn).

5. Encoder signal output

Output signals include sine wave (current or voltage), square wave, open collector (PNP, NPN), push-pull, etc. TTL is long distance differential drive (symmetrical A, A-, B, B-, Z, Z-), HTL.

6. Encoder signal connection

The pulse signal of the encoder is usually divided into low-speed modules with low switching frequency and high-speed modules relative to the counter, PLC, computer, PLC and the module connected to the computer. Used for one-way connection, one-way counting and one-way speed measurement.

A.b two-phase connection is used for forward counting, judging forward and speed measurement.

The a, B, Z three-phase connection is used for position measurement with reference position compensation.

Due to the connection of A, A-, B, B-, Z, Z- and symmetrical negative signals, the subsequent differential input circuit can cut off the common mode noise and use only the useful differential mode signal, so it is highly interference resistant and can transmit over long distances.

Rotary encoders play an important role in automatic control, and understanding and applying the principles of rotary encoders can help identify faults and maintain equipment. I hope these tips help!

WhatsApp/Wechat: +86 13075286997

E-posta: sales@vacuz.com [fusion_form form_post_id="431″ margin_top="" margin_right="" margin_bottom="" margin_left="" hide_on_mobile="small-visibility,medium-visibility,large-visibility" class="" id=""][/fusion_form]