Vortex lattice absolute location sensor with error average effect

Abstract

The invention provides a vortex lattice absolute position sensor with error averaging effect in the technology field, which is composed of a fixed lattice and a moving lattice, wherein each group of sensor coils on at least one code channel on the moving lattice of the sensor are connected with each other in series; the distance between adjacent coils along the direction of a measurement shaft isuniform; the position of each coil relative to a sensitive conductor on the fixed lattice is consistent; and the coils work at the same time and are equivalent to one coil. Meanwhile, the distance oftwo coil groups is reduced to 1 / 4 wavelength by adopting narrow coil manner or staggered coil manner to further improve the measurement accuracy. Additionally, a three-code-track absolute positioningscheme is adopted, wherein the fine code track is used for accurate measurement of decimal fraction of the displacement, the middle code track is used for achieving positioning with intermediate accuracy, and the coarse code track is used for achieving coarse positioning. Additionally, symmetrical layout and double-coil scheme are adopted to improve the absolute positioning accuracy, lower the process requirement and reduce the manufacture cost.

Description

technical field [0001] The invention relates to a sensor in the technical field of measuring instruments, in particular to an absolute position sensor of an eddy current grid with an error averaging effect. Background technique [0002] Various measuring tools used in the existing manufacturing sites are generally developing in the direction of digitalization, large range, absolute code, etc., and the requirements for waterproof, dustproof, shockproof, and antimagnetic are getting higher and higher. At present, the large-range displacement sensors with waterproof function launched around the world can be summarized into the following four types: [0003] The first is a displacement sensor based on the principle of a differential transformer. This type of sensor uses the eddy current effect to form a differential transformer type displacement sensor. It consists of a pair of transmitting coils and receiving coils. It realizes large-scale displacement measurement through mutua...

AI Technical Summary

Problems solved by technology

The disadvantage is that the sensor coil part is relatively large, which is not conducive to further miniaturization

[0004] The second type is a displacement sensor based on the principle of variable reluctance. This type of sensor uses the magnetoresistance effect to form a magnetoresistive displacement sensor. It is small in size, can realize large-scale displacement measurement, and has a waterproof function, but the influence of magnetic particulate matter cannot be ruled out. , and the displacement sensor output signal of this principle is incremental

However, this kind of sensor lacks the error averaging effect, so it has high requirements on the production process, and requires high manufacturing and installation accuracy to meet the requirements for measurement accuracy and reduce the probability of error

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