What is the working principle of the encoder How to classify encoders

What is the working principle of the encoder? How to classify encoders?

An encoder is a device that compiles and converts a signal (such as a bit stream) or data into a signal form that can be used for communication, transmission and storage. The encoder converts angular displacement or linear displacement into electrical signals. The former is called a code wheel and the latter is called a code ruler.

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

What is the working principle of the encoder? How to classify encoders?

The encoder is mainly composed of a code disk 40; a circular grating, an indicating grating; a body, a light emitting device, a photosensitive device, and the like.

The circular grating is composed of radial light and dark stripes painted on transparent materials or drawn on metal materials. The adjacent fringe spacing is called the grating node, and the number of grating segments is the number of pulses and the resolution of the encoder; the results show that the grating is a fixed grating sheet, but the window strip lines are exactly the same as the round grating lines. The body is a carrier for assembling parts such as circular gratings and indicating gratings. The light emitting device is usually an infrared light emitting tube. Photosensitive devices are high-frequency photosensitive elements, generally silicon photocells and photosensitive triodes.

What is the working principle of the encoder? How to classify encoders? According to the working principle, the encoder can be divided into incremental encoder and absolute encoder.

Incremental encoder

The incremental encoder converts the displacement into a periodic electric signal, and then converts the electric signal into a counting pulse. The number of pulses represents displacement.

Working principle diagram

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

Advantages and disadvantages of incremental code disc

Advantages of incremental encoder:

(1) High precision 40; frequency multiplication circuit can be used to further improve accuracy;

(2) It has the advantages of low cost, low cost, high reliability and long service life. Suitable for angle measurement and speed measurement of non-contact measurement.

4. Precautions for use

(1) Consider zero finding

(2) Consider the cumulative error that may be caused by interference

(3) Consider the contradiction between maximum speed and resolution

(4) Consider the problem of counter overflow

What is the working principle of the encoder? How to classify encoders?

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

Absolute encoder

The absolute pulse encoder is an absolute angular position detection device. The position output signal is a certain standard digital signal. Indicates the absolute position after displacement. After calculation, the displacement value is obtained by using the digital signal of the absolute position of the start and end points. The structure is composed of three parts: rotating code disc, light source and optical sensor. Optical code channel: The transparent area and the opaque area are distributed on each code channel according to certain rules. Principle: The light source passes through the optical system, and the photosensitive element behind the slit is received by the optical system, and the output is "1"; if it is blocked by the opaque area, the output of the photosensitive element is "0". The output code combination of each code channel represents the angular position of the code wheel.

Advantages and disadvantages of absolute code disc

(1) High precision, no contact, long service life

(2) No change required when starting up

(3) No cumulative error

(4) No counter is needed, allowing high speed.

Disadvantages: (1) Complex structure and large volume

2) High price

5. Precautions for use

1. Reliable power supply, pay attention to voltage drop during long-term transmission

2. Consider handling error codes

3. Consider zero-crossing

What is the working principle of the encoder? How to classify encoders? okplazas.com is a high-tech enterprise integrating R&D, production and sales of industrial encoders and high-precision couplings. The main products of the company are encoder and coupling series. Friends who are interested are welcome to exchange and learn together!