Method and system for accurately matching data of SMR chip and non-magnetic coded disc of encoder

By setting a calibration mark area and performing triple calibration in the SMR encoder, the problems of angle misalignment and signal mismatch during the assembly process of the SMR encoder are solved, achieving high precision and long lifespan self-calibration capability, suitable for demanding industrial applications.

CN121954084APending Publication Date: 2026-05-01NANJING XINYUE ELECTRONIC TECH CO LTD
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Patent Information

Application Number
CN202610159033.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-04
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing SMR encoders have slight angular misalignment or radial eccentricity during assembly, which causes phase deviation of the A/B phase quadrature signals and signal amplitude mismatch. They lack an effective online calibration mechanism and cannot dynamically compensate for long-term drift caused by temperature changes or mechanical wear, affecting high-precision and long-life applications.

Method used

A system for precise data matching between an encoder's SMR chip and a non-magnetic code disk is provided. By setting a calibration mark area on the non-magnetic code disk, the system automatically acquires bias, gain, and phase compensation parameters using a signal processing module to achieve triple calibration. The system integrates a programmable gain amplifier and a phase compensation register, and supports online self-calibration.

Benefits of technology

It significantly improves position repeatability, supports power-on self-calibration or periodic online calibration, reduces system costs, and is suitable for demanding scenarios such as robot joints and servo motors, improving the system's anti-interference capability and positioning accuracy.

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Abstract

The invention relates to the technical field of sensors and precision measurement, and discloses an accurate matching method and system for data of an SMR chip of an encoder and a non-magnetic coded disc, and the method and system are characterized in that a special magnetic calibration pattern is integrated on a non-magnetic coded disc body, and the pattern is automatically driven to pass through the SMR sensing chip when the system is powered on, so that the non-magnetic coded disc is accurately matched with the SMR sensing chip. Bias, gain and phase error parameters are synchronously collected and calculated at a time, and the parameters are directly written into a programmable gain amplifier and a phase compensation register in the SMR sensing chip, so that front-end hardware-level real-time compensation carried out from a signal source is realized, and a closed-loop self-calibration system without external calibration is formed.
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