An absolute position detection system and method for a magnetic levitation conveyor system

CN116793197BActive Publication Date: 2026-06-05NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2023-06-20
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing linear motors cannot detect the initial position upon power-up, and the detection system is susceptible to interference from complex working conditions, resulting in high unit costs and making it difficult to apply in fields such as high-precision IC assembly lines.

Method used

An absolute magnetoresistive encoder position detection system is adopted, including a permanent magnet secondary mover, segmented motor windings, an absolute magnetoresistive encoder position detection board, a PMAC controller, an industrial computer, etc. The direction of the permanent magnet magnetic field is detected by the magnetoresistive sensor, and combined with the Cordic arctangent algorithm and orthogonal signal compensation filtering, non-contact high-precision position measurement is achieved.

Benefits of technology

It enables the absolute position to be determined when the motor is powered on, unaffected by external environmental interference, with an accuracy of 10µm, high flexibility, and suitability for high-precision servo systems, thus reducing unit cost.

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Abstract

The application discloses a kind of absolute position detection system and method of magnetic levitation conveying system, including one or more permanent magnet secondary mover, multiple segmented motor winding, absolute reluctance encoder position detection plate, multiple PMAC controller, industrial computer, guide rail slider, guide rail, motor base;Wherein, absolute reluctance encoder position detection plate includes multiple reluctance sensors, analog-digital converter, reluctance encoder controller, ethernet interface communicator;Reluctance sensor is connected with analog-digital converter, analog-digital converter is connected with reluctance encoder controller, and reluctance encoder controller is connected with ethernet interface communicator, and ethernet controller is connected with PMAC controller.The application realizes the non-contact position measurement between magnetic levitation mover and stator;With higher reliability under the condition of guaranteeing high precision;Using reluctance encoder controller digital processor, high-speed communication of data stream is realized, and real-time control effect is improved.
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