Linear Motor Magnetic Pole Teeth Reduce Flux Leakage
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Solution Overview
Problem
Conventional linear motors experience reduced thrust due to magnetic flux leakage between adjacent magnetic poles, which worsens when the pitch between magnets is narrowed, leading to inefficient thrust generation.
Innovation Solution
The linear motor design features magnetic poles with the same polarity, deployed with clearances and variable spacing, and multilayered magnetic-pole teeth to minimize magnetic flux leakage, allowing for adjustable pitch and reduced thrust pulsation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the pitch between magnets is narrowed to generate higher thrust, then the thrust should increase, but the magnetic flux leakage between adjacent magnetic poles increases, resulting in lower thrust
Solution Approach 1:
Magnetic-pole teeth with the same polarity are introduced as intermediary elements between adjacent magnets of opposite polarity. These teeth act as magnetic flux barriers that prevent direct leakage between adjacent magnets, allowing the pitch to be narrowed without increasing flux leakage. The teeth serve as mediators that maintain magnetic field integrity while enabling closer magnet spacing for higher thrust density.
Solution Approach 2:
The magnetic pole structure is segmented into multiple magnetic-pole teeth rather than using a single continuous pole. This segmentation creates discrete flux paths and prevents lateral leakage between adjacent magnets. The segmented teeth structure allows independent optimization of each tooth's position and polarity, reducing overall flux leakage while maintaining high thrust generation capability.
2Stability of the object's composition
If adjacent magnetic poles have mutually different polarities to cancel magnetically-attractive force, then the magnetic balance is improved, but magnetic flux leaks to adjacent magnetic poles, reducing thrust
Solution Approach 1:
Different regions of the magnetic pole structure are assigned different polarities locally. Magnetic-pole teeth with the same polarity are positioned adjacent to each other in the traveling direction, while magnets of opposite polarity are positioned in specific regions. This local differentiation allows cancellation of magnetically-attractive forces in certain areas while maintaining high thrust in other areas, resolving the contradiction between force balance and thrust generation.
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
This configuration reduces magnetic flux leakage, enabling higher thrust generation and adjustable thrust pulsation, resulting in a more efficient linear motor.
Implementation Method 1
magnetic fluxes generated by the windings deployed on the armature have one and the same polarity in the plurality of magnetic poles
Implementation Method 2
a large magnetically-attractive force is exerted between its displacer, which is constituted with an array of permanent magnets, and its armature
Data Source
AI summary
A linear motor including magnetic-pole teeth which pinch and hold permanent magnets deployed in a displacer, a plurality of iron cores used for continuously connecting the magnetic-pole teeth, windings wound around the plurality of iron cores in batch, and the displacer in which positive and negative magnetic poles of the permanent magnets are arranged alternately. A plurality of magnetic poles including the magnetic-pole teeth and the iron cores are deployed along a longitudinal direction of the displacer. The windings which are common to the plurality of magnetic poles are deployed on the iron cores. The leakage magnetic flux between the adjacent magnetic poles is reduced by making polarities of the plurality of deployed magnetic poles one and the same polarity.