An encoder is a device that compiles and converts a signal (such as a bit stream) or data into a signal that can be used for communication, transmission, and storage. The encoder converts an angular displacement or a linear displacement into an electrical signal, the former being called a code wheel and the latter being called a code ruler. According to the readout mode, the encoder can be divided into contact type and non-contact type; according to the working principle, the encoder can be divided into two types: incremental type and absolute type. The incremental encoder converts the displacement into a periodic electrical signal, which is then converted into a counting pulse, and the number of pulses is used to represent the magnitude of the displacement. Each position of the absolute encoder corresponds to a certain digital code, so its indication is only related to the start and end positions of the measurement, regardless of the intermediate process of the measurement.
Mechanical installation of absolute rotary encoders:
The mechanical installation of the absolute rotary encoder is equipped with high speed end mounting and low speed end mounting.
Auxiliary mechanical installation and other forms.
High-speed end installation: installed on the shaft end of the power motor (or gear connection). The advantage of this method is high resolution. Since the multi-turn encoder has 4096 turns, the number of motor revolutions is within this range, which can be fully increased by the full range. The disadvantage of resolution is that after the moving object passes through the reduction gear, there is gear gap error in the round trip, which is generally used for one-way high-precision control positioning, such as roll gap control of rolling steel. In addition, the encoder is directly mounted on the high-speed end, and the motor jitter must be small, otherwise the encoder may be damaged.
Low-speed end installation: After installation on the reduction gear, such as the shaft end of the hoisting wire rope reel or the last section of the reduction gear shaft end, this method has no gear back and forth clearance, the measurement is relatively straightforward and the precision is high. Distance positioning, such as various lifting equipment, feeding trolley positioning, etc.