Servo motor encoder is installed on the servo motor to measure the position of the magnetic pole and the servo motor angle and speed of a sensor, from the different physical medium, servo motor encoder can be divided into intoelektrične encoder and magnetoelektrične encoder, in addition to the resolver also a special servo encoder, the market is basically used photoelectric encoder, but the magnetoelectric encoder as a rising star% 2c has the karakteristike of pouzdanost, jeftino, anti-zagađenje, etc., there is a tendency to catch up with the photoelectric encoder.