A position sensing system

By constructing a reference signal and using a magnetic grating system to sense the output signal, the assembly accuracy requirement of the micro-displacement/motion detection system is solved, and the stability and flexibility are improved.

CN120777975BActive Publication Date: 2026-07-21MULTIDIMENSION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
MULTIDIMENSION TECH CO LTD
Filing Date
2025-08-20
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing position/motion sensing systems based on magnetic field detection technology require strict assembly precision, especially for micro-displacement/motion detection systems, which leads to difficulties in design, manufacturing and assembly.

Method used

A reference signal is constructed using the sensing output signal of the magnetic grating system. The minute motion/displacement in the direction perpendicular to the magnetic grating plane is measured, and the assembly accuracy requirements in the magnetic pole arrangement direction of the magnetic grating are reduced. The Z-axis position of the object under test is calculated through the data processing module.

Benefits of technology

This reduces the precision requirements of system assembly and improves the stability of system operation. Even if the magnetic field sensing module is offset on the X-axis, it will not affect the operation.

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Abstract

The application provides a position sensing system. The position sensing system comprises a magnetic grid, a magnetic field sensing module and a data processing module. Based on the magnetic field characteristics formed by the periodic magnetic poles of the magnetic grid, a reference signal corresponding to the position of the Z-axis (perpendicular to the plane of the magnetic grid) is constructed to measure the movement / position of the object to be measured in the direction of the Z-axis. The reference signal is calculated by the output signal of the corresponding magnetic field sensing module via the data processing module. The position sensing system provided by the application benefits from the construction of the reference signal, which can not only measure the small movement / displacement of the object to be measured in the direction of the Z-axis, but also be almost insensitive to the position of the magnetic field sensing module opposite to the magnetic grid due to the structural characteristics of the magnetic grid itself, so that the position of the magnetic field sensing module does not need to be strictly limited, and the overall assembly precision requirement of the system is low.
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