How much do you know about encoders

An encoder is a sensor that generates a digital signal in response to movement. It is mainly divided into two categories: rotary encoders that respond to rotary motion linear encoders that respond to linear motion. When used with mechanical transmission devices such as rack pinion, measuring wheels spindles, shaft encoders can also be used to measure linear motion, speed position.

The encoder has multiple output modes. Incremental encoders generate a series of pulses during movement, which are used to measure speed feed back to a counter for position tracking. The absolute encoder generates a multi-digit code that directly indicates the current position.

Encoders are widely used. They can be used as feedback transmitters for motor speed control, as sensors for measuring, cutting positioning, as input for speed control.

Encoder technology is divided into light induction magnetic induction. Optical sensing technology has the characteristics of high resolution, high speed, reliability durability, is suitable for most industrial environments. Magnetic induction is usually used in harsh working environments, such as steel mills paper mills. It has the characteristics of high resolution, high speed, dust moisture resistance, high temperature resistance mechanical shock resistance.

The material of the photoelectric encoder code disc is glass with patterns, metal plastic with grooves (for rotary encoders) glass metal strips (for linear encoders). The light emitted by the LED passes through the code wheel yardstick, illuminates one more photodetectors, then generates the encoder output. Incremental encoders have one more such code channels, absolute encoders have code channels equal to the number of output bits.

Electromagnetic induction technology has high resistance to dust, grease, water vapor other pollutants common in industrial environments, as well as shock vibration. There are many types of magnetic sensors.

One is a variable magnetoresistive sensor, which can detect changes in the magnetic field caused by the appearance movement of ferromagnetic objects. A simple rotating variable reluctance sensor (often called a variable reluctance sensor) consists of a permanent magnet with a coil. When the tooth passes, the coil generates a voltage pulse. This kind of sensor is rugged, reliable, inexpensive, is mainly used for speed measurement. It will stop working only when an object passes its measurement surface at a speed of 180 inches per second faster.

Another type of sensor uses permanent magnets devices with Hall effect magnetoresistance effect. When ferromagnetic materials appear, voltage resistance changes are generated. Ferromagnetic materials can be gear tooth type (for rotary encoders) slotted metal belt type (for linear encoders). This type of sensor can even work at zero speed, there are two types of rotation linear. There is also a magnetic sensor that uses a magnetoresistive device to detect the presence of magnetized "stripes" on the drum edge non-magnetic strips.

DEUPREE(Qingdao) Industrial Technology Co., Ltd. is an integrated enterprise focusing on the research development of automated industrial technology equipment manufacturing. The company’s products mainly include rotational motion sensors, linear displacement sensors, object recognition sensors, laser rangefinders, process Control measurement instruments, signal detection systems, signal transmission systems, immature drive systems, UPS safety power supply systems, automation equipment energy-saving cleaning auxiliary equipment systems are limited to this. We can also customize flexibly customize according to customer needs. Meet the different needs of different customers.