What is Encoder and Its Major International Schools

Release time:

2023-12-07 00:00

1.Encoder Introduction

Japanese servo manufacturers generally package encoders, servo drives, and motors to provide customers with complete sets; Similar to Huawei, they develop their own software and hardware to maximize hardware performance and build their own ecosystem. For example, Japanese manufacturers such as Yaskawa, Panasonic, Mitsubishi, Omron, and Goat all follow this route. In addition, due to its profound technological accumulation, Japan has also developed specialized encoder suppliers, such as Tamagawa, Nikon, Sanxie, etc.European servo systems are more open; Generally, servo drive manufacturers only produce drives, achieving the ultimate functional performance of the drives. They can match various encoders and motors, such as Gaochuang, ABB, ACS, Elmo, Bacaray, Copley, and ColMorgan; In terms of encoders, highly professional international brands such as Heidelberg, Renishaw, and Sick have emerged, including Bergen, Boster, and Baruff, who specialize in magnetic coding; Of course, there are also some manufacturers who provide complete sets of servos, such as Beifu, Siemens, Schneider and other giants. European style servo, everyone has clear division of labor, each improving their own technology, and each company has their own expertise; In addition, a series of supporting industries have also emerged, especially with the support of semiconductor technology, such as ICHAUS, AVAGO, AMS, Infineon, etc., providing ASIC level overall solutions for encoder technology, such as dedicated induction chips, subdivision chips, and decoding chips.

1.1Encoder Definition

An encoder is a device that encodes and converts signals (such as bitstreams) or data into signal forms that can be used for communication, transmission, and storage. The encoder converts angular displacement or linear displacement into electrical signals, the former being called a code disk and the latter being called a code ruler. According to the reading method, encoders can be divided into two types: contact type and non-contact type; According to the working principle, encoders can be divided into two types: incremental and absolute. An incremental encoder converts displacement into a periodic electrical signal, which is then converted into a counting pulse. The number of pulses is used to represent the magnitude of displacement. Each position of the absolute encoder corresponds to a determined numerical code, so its indication is only related to the starting and ending positions of the measurement, and is independent of the intermediate process of the measurement.

1.11incremental encoder

It means that a pulse signal is emitted every time a unit angle is turned (or sine and cosine signals are sent, and then subdivided to chopping out higher frequency pulses), usually outputting A-phase, B-phase, and Z-phase pulses. A-phase and B-phase pulses are delayed by 1/4 cycle each other, and the forward and reverse directions can be distinguished according to the delay relationship. Moreover, by taking the rising and falling edges of A-phase and B-phase, the frequency can be doubled or quadrupled; The Z-phase is a single cycle pulse, meaning one pulse is emitted per cycle.

1.12Absolute value encoder

It corresponds to a circle, and each reference angle emits a unique binary value corresponding to that angle. Multiple positions can be recorded and measured through external circle recording devices. The more code traces there are, the greater the accuracy.Like a 21 bit absolute value encoder.

1.13Hybrid encoder

Hybrid absolute encoder, which outputs two sets of information, one set of information is used to detect the position of magnetic poles, with absolute information function; The other group has exactly the same output information as the incremental encoder.Divided by signal output typeVoltage output, open collector output, push-pull complementary output, and long line drive output.3 Classification by mechanical installation of encoders(1) Axis type: Axis type can be divided into clamping flange type, synchronous flange type, and servo installation type. [2](2) Axis sleeve type: Axis sleeve type can be divided into half empty type, full empty type, and large diameter type, etc.According to the working principle of the encoder, it can be divided intoAt present, there is still a significant gap in accuracy between magneto electric encoders and optoelectronic encoders. With a 17 bit magnetic encoder and an accuracy of ± 3 angular minutes, it can only meet some low-end applications and cannot replace optical encoders.

“KASEI” SGY multi -circle mechanical magnetic induction absolute value encoder

“KASEI” FZR100 hollow absolute value series encoder

“KASEI” SGY multi -circle mechanical magnetic induction absolute value encoder

“KASEI” FZR100 hollow absolute value series encoder