A second-order sliding mode permanent magnet synchronous motor compound control method based on load torque identification observer

CN117578940BActive Publication Date: 2026-11-03JIANGSU UNIV
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Patent Information

Application Number
CN202311652787.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-04
Publication Date
2026-11-03
Estimated Expiration
2043-12-04

AI Technical Summary

Technical Problem

Traditional sliding mode observers struggle to suppress rotational speed fluctuations under conditions of large load and inertia variations, and the introduction of low-pass filters leads to phase delay and reduced estimation accuracy, affecting the performance of the drive system.

Method used

A composite control method for a second-order sliding mode permanent magnet synchronous motor based on a load torque identification observer is designed. By introducing a non-smooth function and a Levant sliding mode filter, combined with a feedback loop, discontinuities and high-frequency interference are reduced, and estimation accuracy and response speed are improved.

Benefits of technology

This technology enables the motor to quickly and accurately track a given speed under complex operating conditions, reducing controller chatter, minimizing energy loss, and improving estimation accuracy and system stability.

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Abstract

The application discloses a kind of second-order sliding mode permanent magnet synchronous motor compound control methods based on load torque identification observer, belong to permanent magnet synchronous motor control field.Under the control method, motor speed can be quickly and accurately tracked to given speed under complex working condition.Main steps are:1, construct permanent magnet synchronous motor mathematical model;2, define the state variable of system and design second-order sliding mode controller, so that motor speed is stably tracked ideal signal;3, construct load torque identification observer to estimate torque, and design second-order sliding mode compound controller.The advantages of the application are: firstly, observer can quickly and accurately identify load torque change, reduce the influence of sudden load on motor speed;Secondly, second-order sliding mode controller effectively reduces chattering problem, reduces energy loss;Thirdly, using new type of sliding mode filter plus feedback loop instead of low-pass filter, overcome the influence of sampling time on filter performance, reduce the phase lag and amplitude attenuation caused by low-pass filter.
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Citation Information

Patent Citations

  • Position Sensorless Control of PMSM Based on Improved Sliding Mode Observer

    CN109167547A

  • Permanent magnet synchronous motor control method based on sliding mode load torque observer

    CN110460280A