Segmented Armature Linear Motor for Lower Flux Leakage
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Solution Overview
Problem
Existing linear motors face challenges in enhancing thrust density due to leakage magnetic flux between coils aligned in a linear motion direction in the armature.
Innovation Solution
The armature is divided into multiple portions, allowing for efficient opposition of coil cores to the magnetic pole element, thereby reducing the opposition area and maintaining effective magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If coils are aligned in a linear motion direction in the armature, then the linear motor can generate thrust, but leakage magnetic flux occurs between the coils which hinders thrust density enhancement
Solution Approach 1:
The armature is divided into multiple armature portions (first, second, third armature portions) spaced apart in a direction orthogonal to the linear motion direction. This segmentation reduces the axial opposition area between coils while maintaining the effective magnetic flux, thereby reducing leakage magnetic flux and enhancing thrust density.
2Loss of energy
If the opposition area between coils is reduced, then leakage magnetic flux decreases, but the effective magnetic flux may also be reduced
Solution Approach 1:
The armature portions are spaced in a direction orthogonal to the linear motion direction (radial direction in cylindrical coordinates), utilizing a different spatial dimension to reduce axial opposition area without compromising the effective magnetic flux. The magnetic flux flows effectively between the magnetic pole element and each coil core while the axial opposition area is minimized.
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 leakage magnetic flux, leading to enhanced thrust density and improved magnetic efficiency in linear motors.
Implementation Method 1
The armature generates a magnetic field that moves the magnetic pole element in a linear motion direction relatively to the armature
Implementation Method 2
Each of the first coils generates a magnetic flux that flows between each of the first coil cores and the first magnetic pole surface
Implementation Method 3
Each of the first coils generates a magnetic flux that flows between each of the first coil cores and the first magnetic pole surface
Data Source
AI summary
Provided is a linear motor capable of having enhanced thrust density. The linear motor includes a magnetic pole element and an armature including coils. The magnetic pole element includes magnetic pole element cores and permanent magnets. The magnetic element cores include first cores, second cores, third cores, and fourth cores, each aligned in the linear motion direction. The permanent magnets are interposed between mutually adjacent magnetic element cores among the magnetic element cores. The armature is divided into a first armature portion opposed to the first and third cores, a second armature portion opposed to the first and second cores, a third armature portion opposed to the third and fourth cores.