The encoder manufacturer teaches you how to judge the encoder failure2021

Encoder is a device that compiles and converts signals or data into signal forms that can be used for communication, transmission and storage.

What is the function of the encoder?

The encoder converts angular displacement or linear displacement into electrical signals. The former becomes a code disc and the latter is called a yardstick. Encoders can be divided into contact type and non-contact type according to the reading mode. The contact type uses a brush to output. A brush touches the conductive area or the insulating area to indicate whether the status of the code is "1" or "0"; the non-contact type receiving sensitive element is a photosensitive element or a magnetic sensitive element. The light-transmitting area and the opaque area indicate whether the state of the code is "1" or "0", and the collected physical signal is converted into an electrical signal readable by the machine code through the binary code of "1" and "0" Used for communication, transmission and storage.

Encoder function: used for speed, position, detection feedback. For example:

Spindle encoder: feedback the actual speed of the spindle, mainly used in thread processing.

The encoder on the motor: is a feedback unit used to check how many pulses the motor has executed, so as to achieve the function of precise positioning.

Regarding the problem of encoder failure, besides the problem of the encoder itself, what other problems might it be?

The encoder is a fine component, which is mainly due to the serious disturbance around the encoder, for example: is there a large motor, electric welding machine frequently starting to cause disturbance, is it transmitted in the same pipeline as the power line, etc.

It is also very important to choose what kind of output is opposite to interference. Usually, the anti-interference of output with reverse signal is better, namely A+~A-, B+~B-, Z+~Z-, which is characterized by the addition of 8 power lines, and Not 5 lines (total zero). The transmission in the cable with the reverse signal is symmetrical, and the disturbance is small, and the discrimination can also be added in the receiving equipment.

Even the encoder (electronic handwheel) is also good or bad. The code disc\electronic chip\internal circuit\signal output is very different. Otherwise, how about a 1000-line incremental encoder will be different from 300 yuan to 3000 yuan So big?

The easiest way to judge whether it is a fault with the encoder itself is to eliminate it. It is mainly from three aspects of cleaning (moving away, sealing, blocking) disturbance sources; judging whether it is a cumulative error of a mechanical gap; judging whether it is a mismatch between the control system and the encoder circuit interface (encoder selection error), etc. .