Theory analysis of a new absolute position sensor based on electromagnetism

Rotating angle of joint is an important factor in control field of robot arm. In the paper, a new sensor to test the absolute rotating angle of robot arm joints is designed. Firstly, structure of the magnetic field emitter is presented. Secondly, the generating process of signals sine and cosine is introduced. Then, working principle of the senor is described. At last, a new encoder is designed. The emitter working together with the encoder can test the absolute rotating angle and the calculation process is given in the paper. At the end of the paper, advantages of the sensor are listed.