Magnetic grating displacement transducer based on Hall magnetic sensitive element array

Abstract

The invention provides a magnetic grating displacement transducer based on a Hall magnetic sensitive element array. Magnetic steels with the same specification are arranged into a row and fixed onto a magnetic base to serve as a magnetic railing ruler, adjacent polarities of the magnetic steels are opposite, and six Hall magnetic sensitive elements are arranged into a row at equal intervals to serve as a magnetic head. A strong magnetic field can be obtained as the magnetic steels serve as the magnetic railing ruler, and the magnetic field is much stronger than general record magnetism. Moreover, by the aid of magnetic steel arrangement, the magnetic steels and arrangement modes can be replaced at any time, encoding and measuring length adjustment are facilitated. The Hall magnetic sensitive element array serves as the magnetic head, output signals can be linearized within a period by overlapping two curves with a certain angle of phase difference in the output signals of the six Hall elements and selecting different interpolating curves at different angles within the period, displacement calculation accuracy is improved, and the data processing procedure is simplified.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular provides a magnetic grating displacement sensor based on a Hall magnetic sensitive element array. Background technique [0002] With the development of modern technology and the improvement of automation level, a large number of real and reliable displacement sensors that reflect the position information of the measured object are required in the fields of aerospace, machinery manufacturing, and high-precision CNC machine tools, and the displacement sensor system is required to have high resolution, Small size, light weight, fast response, good stability and other characteristics. And further require the displacement sensor to transform from the traditional analog quantity to the digital direction. Magnetic scale is the most commonly used and basic type of digital displacement sensor. Magnetic grating displacement sensor, because of its high anti-vibration and impact resistanc...

AI Technical Summary

Problems solved by technology

The magnetic induction coil head has the disadvantages of large volume, complex circuit, and poor anti-interference.

Moreover, coil winding and adjustment require manual operation, which is difficult to automate production

However, the output signal of the magnetic grid sensor with a single Hall magnetic sensitive element as the magnetic head is seriously nonlinear, the signal processing is more complicated, and the measurement accuracy is poor.

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