Angle measurement system based on linear Hall sensors and angle measurement method

Abstract

The invention discloses an angle measurement system based on linear Hall sensors and an angle measurement method. The angle measurement system comprises four linear Hall sensors, four potentiometers, an AD sampling apparatus, a microprocessor and a display, and is characterized in that the four linear Hall sensors are sequentially arranged along a circumference, two adjacent linear Hall sensors are orthogonally placed, two opposite linear Hall sensors are placed in a directly facing manner, and a central axis of a radial magnetization magnet passes the center of the circumference along which the four linear Hall sensors are arranged and is perpendicular to the circumference. A signal output end of each linear Hall sensor is connected with a first fixed end of the corresponding potentiometer, second fixed ends of the four potentiometers are grounded, sliding ends of the four potentiometers are connected to four sampling channels of the AD sampling apparatus, and the microprocessor calculates a rotation angle according to ADC data and outputs the calculated rotation angle to the display. A defect of narrow measurement range of a traditional angle measurement method is overcome, and measurement for angles within a range of 0-360 degrees is realized.

Description

technical field [0001] The invention belongs to the technical field of angle measurement, and in particular relates to an angle measurement system and a measurement method based on a linear Hall sensor. Background technique [0002] Angle measurement technology is widely used in radar, aerospace, power electronics, construction, automobile and many other fields. In these application fields, angle measurement is required as a closed-loop feedback control quantity in most cases. Therefore, the accuracy of angle measurement sometimes directly determines the control accuracy. [0003] At present, due to the complicated manufacturing process, only one-dimensional magnetosensitive sensors have been widely used in practical applications, which mainly include magnetoresistive type and Hall plate type: [0004] The magneto-resistive angle sensor has the advantage of high sensitivity, but the measured angle value will drift with the temperature change, and it is difficult to realize ...

AI Technical Summary

Problems solved by technology

[0004] The magnetoresistive angle sensor has the advantage of high sensitivity, but the measured angle value will drift with the temperature change, and it is difficult to realize it with standard CMOS technology.

[0005] The one-dimensional Hall plate angle sensor has good sensitivity, and the zero magnetic field output voltage can be adjusted through the peripheral circuit, and the linearity error is small, but it can only realize the angle measurement in the range of 0-90°, and the measurement range is narrow

Images