Hall type angle transducer with stable structure

Abstract

The invention discloses a Hall type angle transducer with a stable structure. The Hall type angle transducer comprises a magnet and a PCB (printed circuit board), wherein the PCB is provided with a Hall element. The Hall type angle transducer is characterized by also comprising a rotating shaft, wherein the center of the upper end surface of the rotating shaft is provided with a lug boss, the lug boss is provided with a blind hole coincident with an axis of the rotating shaft, the magnet is fixedly arranged at the bottom of the blind hole, the lug boss is rotatablely abutted on the PCB, the Hall element is accommodated in the blind hole, and in addition, a gap is left between the Hall element and the side wall of the blind hole. When the tested rotating shaft generates the axial movement, the magnet and the Hall element can maintain the effective work distance, and the magnetic field intensity exerted by the magnet on the Hall element is enabled to be stable, so the output linearity of the transducer is high. Therefore, the Hall type angle transducer has the characteristics that the structure is stable and compact, the anti-interference performance on the work environment is high, the work stability and the reliability are high, and the corner measurement is precise.

Description

technical field [0001] The invention relates to a Hall-type angle sensor, in particular to a Hall-type angle sensor with a stable structure. Background technique [0002] Hall angle sensors are widely used in automobile manufacturing, industrial manipulator curvature control, aerospace and navigation equipment manufacturing and other industries to sense the angle changes of accelerator pedal, brake pedal, clutch pedal, etc. The reliability and stability of the Hall-type angle sensor in sensing the rotation angle are mainly evaluated by the linearity of the characteristic curve of the measured rotation angle θ and the output voltage U of the Hall-type angle sensor, hereinafter referred to as the output linearity. [0003] Such as figure 1 As shown, the Hall-type angle sensor in the prior art includes a magnet, a Hall element, an A / D conversion circuit, and a DSP amplification and compensation circuit for correcting the linearity of the sensor output signal; wherein, the magn...

AI Technical Summary

Problems solved by technology

[0005] First, because the magnet is separated from the Hall element, it is necessary to carry out position matching with the magnet when installing the Hall element to ensure that the magnetic field strength applied by the magnet to the Hall element is moderate so that the Hall element can work normally. Therefore, the existing Hall angle sensor is difficult to install;

[0006] Second, since the shaft under test is prone to axial movement due to complex working conditions, the position of the magnet fixed on the shaft under test also changes accordingly, and the distance between the Hall element and the magnet is generally relatively small. A slight movement can cause a large change in the magnetic field strength applied by the magnet to the Hall element, so that when the magnet rotates repeatedly, the distribution of the magnetic field strength applied to the Hall element is inconsistent in repeatability, making the Hall The characteristic curve of the Hall-type angle sensor is inconsistent, which reduces the reliability of the Hall-type angle sensor. What's more, when the magnetic field strength applied by the magnet to the Hall element is too strong or too weak, it exceeds the upper and lower limits of the DSP amplification and compensation circuit. When the limit value is reached, the DSP amplification and compensation circuit enters a saturated or cut-off state, causing the Hall-type angle sensor to stop working. Therefore, the output linearity of the existing Hall-type angle sensor is poor, and the stability and reliability are low.

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