Fireresistant Hall device and SmCo rotor is used to design position and speed sensor, and the corresponding doubling circuit and decoding circuit is designed.
The main structure have:Electromagnet and Heng galvanism source, numerical type Gauss account(the effect of Huo Er) and ammeter and volt account, have control dish of illuminate the system.
In this paper, we theoretically demonstrate the Gyrator is a kind of transmission element, and it has behaviour to gyrate impe-dandce.Finally, we find that the Gyrator is realized by Hall effect.