Magnetic Bearing Control Apparatus Sensor Failure Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High speed rotating motors with magnetic bearings face challenges in accurately determining sensor failures, leading to potential noise, degraded rotation speed, and risk of collision with internal components due to difficulty in measuring the position of the rotation shaft and diagnosing abnormal sensor operations.
Innovation Solution
A magnetic bearing control apparatus and method that includes displacement sensors, current sensors, and a controller to accurately determine sensor failures by analyzing stabilization time, floating completion time, and current consumption, allowing for precise control of the rotation shaft's position and preventing collisions by isolating faulty sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a displacement sensor is used to sense the position of the rotation shaft in a high speed rotating motor with magnetic bearing, then the rotation position can be controlled, but the sensor failure cannot be accurately determined leading to noise and degraded rotation speed
Solution Approach 1:
The controller performs preliminary actions by measuring stabilization time and floating completion time of the rotation shaft, and comparing these measurements with reference values before normal operation to detect sensor failures. This preliminary detection mechanism enables early identification of sensor abnormalities without affecting the primary position sensing function.
Solution Approach 2:
The system implements feedback by continuously monitoring the rotation shaft position through the displacement sensor, measuring stabilization characteristics, comparing with reference values, and using this feedback information to determine sensor failure. The feedback loop enables real-time assessment of sensor health while maintaining position control.
2Speed
If the rotation shaft is floated using magnetic bearing without physical contact, then high speed rotation is enabled, but the difficulty in determining sensor abnormal operation increases
Solution Approach 1:
The patent replaces mechanical contact-based position detection with magnetic field-based sensing. The displacement sensor detects the position of the magnetically floated rotation shaft by sensing magnetic field changes rather than mechanical contact, enabling high-speed rotation while providing electrical signals for failure detection.
Solution Approach 2:
The system changes measurement parameters by monitoring stabilization time and floating completion time in addition to position. These temporal parameters provide new dimensions for detecting sensor abnormalities in the magnetic bearing system, complementing the traditional position measurements.
3Ease of operation
If displacement sensor is used to control rotation shaft position, then position control is achieved, but the determination of sensor failure and abnormal operation becomes difficult
Solution Approach 1:
The displacement sensor serves multiple functions: it controls rotation shaft position during normal operation and simultaneously provides data for detecting sensor failures by measuring stabilization time and floating completion time. This multi-functionality reduces the need for separate diagnostic sensors while maintaining position control capability.
Solution Approach 2:
The system performs self-diagnosis by using the displacement sensor's own output signals to detect its own failures. The controller analyzes the stabilization characteristics of the rotation shaft position data to determine sensor abnormalities, enabling the system to self-monitor without external diagnostic equipment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise detection of sensor failures, maintaining stable operation, and preventing malfunctions by accurately controlling the rotation shaft's position, thus enhancing the reliability of magnetic bearings and ensuring safe high-speed rotation.
Implementation Method 1
a magnetic bearing configured to float a rotation shaft from a surface of the magnetic bearing based on the electromagnetic force generated by the plurality of output elements
Data Source
AI summary
A magnetic bearing control apparatus includes a plurality of output elements configured to generate electromagnetic force, a magnetic bearing configured to float a rotation shaft from a surface of the magnetic bearing based on the electromagnetic force generated by the plurality of output elements, at least one displacement sensor configured to sense a displacement of the rotation shaft, and a controller. The controller is configured to control a current supplied to the plurality of output elements, to control a position of the rotation shaft based on the current supplied to the plurality of output elements according to the displacement of the rotation shaft, and to determine a failure of the displacement sensor.