Apparatus and method for sensorless rotor position estimation in active magnetic bearing system
The method estimates rotor position in active magnetic bearings using a Nyquist frequency voltage and state-space model to overcome sensor failure and environmental sensitivity, ensuring reliable and robust position estimation.
KR102991529B1Active Publication Date: 2026-07-15KOREA ADVANCED INST OF SCI & TECH
Patent Information
- Authority / Receiving Office
- KR · KR
- Patent Type
- Patents
- Current Assignee / Owner
- KOREA ADVANCED INST OF SCI & TECH
- Filing Date
- 2026-05-21
- Publication Date
- 2026-07-15
AI Technical Summary
Technical Problem
Existing active magnetic bearing systems rely on position sensors that are susceptible to failure in harsh environments, requiring additional space and complicating the system's structure, and existing sensorless control methods suffer from noise and parameter sensitivity issues.
Method used
A method and device for estimating rotor position using a voltage component of the Nyquist frequency, measuring current, and applying a state-space model to correct the estimated value, eliminating the need for position sensors and improving robustness against noise and parameter changes.
Benefits of technology
Enables reliable rotor position estimation without sensors, simplifying the system structure, reducing noise, and enhancing robustness against environmental factors.
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Smart Images
Figure 112026062134963-PAT00034_ABST
Abstract
The present invention relates to a method for estimating a rotor position without a position sensor in an active magnetic bearing system, wherein a voltage including a voltage component of the Nyquist frequency is applied to a winding, a current flowing through the winding is measured, a state-space model including state transition equations and output equations for state variables is derived from an electrical circuit model based on the voltage applied to the winding and the current, a predicted value of the current is calculated based on the state-space model, an estimated value of the state variable is corrected based on the error between the measured value and the predicted value of the current, and the rotor position is estimated from the corrected estimated value of the state variable.
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