Halbach Array Magnet Sinusoidal Displacement for Force Ripple Reduction
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Solution Overview
Problem
Magnetic levitation train systems using permanent magnets in Halbach array configurations face issues with force ripple due to track slot openings, leading to vibrations and reduced passenger comfort, with existing solutions either increasing costs or compromising reliability.
Innovation Solution
A sinusoidal displacement configuration of magnets within each row of a Halbach array, where each row is arranged perpendicularly to the track, with specific phase shifts (e.g., 90°, 45°, or 22.5°) to reduce force ripple while maintaining average lifting and dragging forces, eliminating the need for slot openings or additional dampers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If track slot openings are used for magnetic levitation, then levitation force is generated, but force ripple causes vibration reducing passenger comfort
Solution Approach 1:
The patent applies local quality by creating non-uniform magnetic field distribution through the sinusoidal displacement of magnets. Each row of magnets has a specific displacement pattern (s1, s2, s3, s4) that creates localized field variations to counteract the periodic force ripple caused by track slot openings, thereby reducing vibration while maintaining levitation force.
Solution Approach 2:
The patent utilizes periodic action by implementing a sinusoidal displacement configuration of magnets that matches the periodicity of the track slot openings. The displacement pattern repeats at intervals corresponding to the slot opening frequency, creating a counteracting periodic magnetic field that reduces force ripple and vibration.
2Object-affected harmful factors
If slot openings of track are decreased or removed to improve force ripple, then vibration is reduced, but track cost increases
Solution Approach 1:
The patent converts the harmful effect of track slot openings into a beneficial solution by using the same slot opening structure to generate a counteracting magnetic field. The sinusoidal magnet displacement creates force ripple that is out of phase with the slot opening-induced ripple, effectively canceling it out and reducing vibration without requiring track modifications.
3Object-affected harmful factors
If dampers are used to reduce oscillation, then vibration is reduced, but friction increases and reliability decreases
Solution Approach 1:
The patent replaces the mechanical damper system with a magnetic field-based solution. Instead of using physical dampers that introduce friction and potential failure points, the invention uses sinusoidal magnet displacement to create a magnetic field configuration that passively reduces force ripple and oscillation, thereby improving reliability while achieving vibration reduction.
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
Significantly reduces oscillations and force ripples, enhancing passenger comfort without increasing track costs or altering the train design, thereby improving the reliability and efficiency of magnetic levitation systems.
Implementation Method 1
The plurality of rows of the magnets each being arranged in a Halbach array configuration, and further being arranged to cooperate to form a magnetic field exerted onto said track
Implementation Method 2
permanent magnets arranged in a particular Halbach array configuration
Implementation Method 3
Repelling magnetic forces are applied to levitate high-speed vehicles as trains
Data Source
AI summary
Magnetic levitation train system comprising a plurality of rows of magnets being faced against a track onto which the magnetic levitation train system rides on, the plurality of rows of the magnets each being arranged in a Halbach array configuration, and further being arranged to cooperate to form a magnetic field exerted onto said track, wherein the magnets of each row of magnets are alternatively displaced with respect to each other according to a sinusoidal configuration.