Magnetosensitive angular displacement sensor without eddy current effect

Abstract

The invention discloses a magneto-sensitive angular displacement sensor without an eddy current effect, which comprises a shell, a rotating shaft, and a circuit board, magnetic steel and a sliding conducting ring which are arranged in the shell, the rotating shaft penetrates through a through hole in the shell and is connected with the shell through a first annular bearing, the shell is a metal shell, and the sliding conducting ring comprises an insulated fixed ring and an insulated rotating ring. The rotating ring can rotate relative to the fixed ring and transmit electric signals, the fixed ring is fixedly installed in the shell, the circuit board is connected with the rotating ring, and the magnetic steel is fixedly installed in the shell. The sliding conducting ring is installed in the shell, and the circuit board is connected with the rotating ring, so that the working mode that the circuit board rotates and the magnetic steel does not rotate is achieved, the angle detection function is achieved, meanwhile, relative displacement between the magnetic steel and the shell is avoided, and therefore the eddy current effect is avoided; The detection precision of the magneto-sensitive angular displacement sensor is improved, and external magnetic field interference is avoided.

Description

technical field [0001] The invention relates to a magnetic sensitive angular displacement sensor, in particular to a magnetic sensitive angular displacement sensor without eddy current effect. Background technique [0002] Magneto-sensitive (Hall principle, magnetoresistance principle, anisotropic magnetoresistance, etc.) angular displacement sensor is an angular displacement sensor made according to the characteristic that the ferromagnetic metal film magnetoresistor is extremely sensitive to the direction of the magnetic field, that is, the direction of the magnetic field is relative to the magnetoresistor. When the current direction changes, the resistance value of the magneto-sensitive resistor changes correspondingly, thereby realizing the angular displacement detection function. Electronic components such as magneto-sensitive resistors of the magneto-sensitive angular displacement sensor are installed on the circuit board, and the magnetic field is generated by magneti...

AI Technical Summary

Problems solved by technology

Since the vast majority of magnetic encoding chips on the market have hysteresis, this interference will affect the accuracy of the sensor's angle feedback

[0005] To sum up, in order to solve the problem of external interference to the magnetic field of the sensor, the traditional solution of replacing the material of the sensor shell with electromagnetic pure iron has the problem of a decrease in detection accuracy caused by magnetic field interference, so it is difficult to meet the needs of high-precision detection

[0006] In addition, the traditional sliding conductive ring mainly includes a fixed ring and a rotating ring. The rotating ring can rotate relative to the fixed ring and transmit electrical signals. The sliding contact between the fixed ring and the rotating ring is generally used, and its life is short, and there are few connecting lines. Adapt to high-speed rotation with single redundancy

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