PMSM Disturbance Observer Control for Fast Robust Response
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Solution Overview
Problem
Permanent magnet synchronous motors face distortion and dynamic performance limitations due to non-linearity and external disturbances, which existing linear feedback control methods struggle to address effectively.
Innovation Solution
The implementation of adaptive back-stepping sliding mode control (ABSMC) with a nonlinear disturbance observation circuit unit, which integrates back-stepping control and sliding mode control to estimate and mitigate disturbances, using an adaptive convergence gain to prevent overshoot and improve robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If linear feedback control is used for permanent magnet synchronous motor, then the control structure is simple, but the motor control suffers from distortion and poor dynamic response under various operating conditions due to non-linearity and external disturbances
Solution Approach 1:
The patent transforms the nonlinear control system into a reduced-order subsystem by changing the parameters and structure of the control algorithm. It uses back-stepping sliding mode control with adaptive convergence gain to handle the non-linear characteristics and external disturbances, converting the complex nonlinear control problem into a more manageable form that maintains both simplicity and robustness
Solution Approach 2:
The patent introduces adaptive convergence gain that dynamically adjusts the control parameters based on system state. This dynamic adjustment allows the controller to adapt to varying operating conditions and external disturbances, improving motor control performance without requiring a overly complex fixed-structure controller
2Reliability
If adaptive convergence gain is used in back-stepping sliding mode control, then robustness to disturbances is improved, but the control algorithm complexity increases
Solution Approach 1:
The patent uses adaptive convergence gain that modifies control parameters based on system state, transforming a static control algorithm into a dynamic one. This allows the controller to maintain robustness against disturbances while managing complexity through structured adaptation rather than fully complex algorithms
Solution Approach 2:
The patent implements feedback mechanisms through the adaptive convergence gain that continuously monitors system performance and adjusts control parameters accordingly. This feedback loop provides robustness to disturbances while maintaining a relatively simple control structure through systematic parameter adjustment
Data Source
AI summary
There is provided an apparatus for controlling a permanent magnet synchronous motor in a permanent magnet synchronous motor system. The apparatus comprises a disturbance observation circuit unit configured to estimate concentrated disturbance of the permanent magnet synchronous motor using a nonlinear observation gain function; and a sliding mode controller configured to control the permanent magnet synchronous motor by reflecting the estimated concentrated disturbance in a position-current single-loop control in which back-stepping control and sliding mode control are integrated.