The difference between magnetic encoder and photoelectric encoder

Recently, encoders have become more and more widely used in various industries, and there have also been some problems with the choice of encoders. Today, let’s talk about the difference between magnetic encoders and photoelectric encoders.

The main part of the magnetic encoder is composed of a magneto resistive sensor, a magnetic drum, and a signal processing circuit. The magnetic drum is recorded into small magnetic poles at equal intervals. After the magnetic poles are magnetized, a periodically distributed spatial leakage magnetic field is generated when rotating. The magnetic sensor probe converts the changing magnetic field signal into a change in resistance value through the magnetoresistance effect, and applies an electric potential. Under the action of, the changed resistance value is transformed into a change in voltage. After processing by the subsequent signal processing circuit, the analog voltage signal is transformed into a digital signal that can be recognized by the computer, realizing the encoding function of the magnetic rotary encoder. Therefore The magneto electric encoder adopts a magneto electric design. The absolute position of the rotor is generated and provided by the magnetic induction device and the change of the magnetic field. The magnetic device replaces the traditional code disc, which makes up for these defects of the photoelectric encoder. Earthquake resistance, corrosion resistance, pollution resistance, reliable performance, and simpler structure.

The photoelectric encoder is composed of a light source, a code disc and a photoelectric receiver. The code disc is the most important part of the encoder. From this point of view, photoelectric encoder is a kind of sensor, which is composed of a photoelectric code disc with a shaft in the center, with annular through and dark scribed lines, and photoelectric transmitting and receiving devices to read and obtain signals. It is mainly used to measure displacement or angle. The materials of the traditional photoelectric encoder code disk include glass, metal and plastic. The glass code disk deposits very thin lines on the glass. Its thermal stability and accuracy can meet the ordinary standards and general requirements, but it is easy to break.

Compared with the traditional photoelectric encoder, the magnetic encoder has the characteristics of anti-vibration, anti-corrosion, anti-pollution, anti-interference and wide temperature, and can be applied to the fields that the traditional photoelectric encoder cannot adapt. Magnetic encoders are encoders specially designed for extreme harsh environments. These occasions generally require wide temperature characteristics, can withstand strong vibrations and shocks, and have a high degree of protection.

In addition, the magnetoelectric encoder also has a reliable model output circuit, and a simple installation method can greatly reduce the loss of downtime. Usually used in metallurgy, papermaking and woodworking machinery. High-performance encoders can be widely used in industrial control, machinery manufacturing, shipbuilding, textiles, printing, aviation, aerospace, radar, communications, military and other fields.


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