Linear Motor Rotor Sub-Core Layout for Lower Magnet Use
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Solution Overview
Problem
The use of permanent magnets in linear motors and compressors is costly, and reducing their usage leads to a decrease in output, while increasing their usage increases costs, presenting a challenge in maintaining output and cost-effectiveness.
Innovation Solution
Incorporating sub cores on both sides of the permanent magnets in the rotor, with specific axial and circumferential arrangements, to maintain output while reducing the usage of permanent magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the usage of permanent magnet is increased to improve the output of the linear motor, then the output is improved, but the costs of the linear motor increase
Solution Approach 1:
The rotor core is divided into a main core and multiple sub-cores that are spaced apart in the axial direction. The permanent magnets are disposed between these segmented cores, allowing the magnetic field to be distributed and enhanced across multiple regions. This segmentation enables achieving high output with reduced permanent magnet material by creating multiple magnetic interaction zones between the segmented cores and the stator.
Solution Approach 2:
Sub-cores are added in the axial dimension, creating a multi-layered magnetic circuit structure. By extending the magnetic path in the axial direction with spaced sub-cores, the patent creates additional magnetic interaction surfaces without increasing the radial or circumferential dimensions significantly. This dimensional approach allows enhanced magnetic flux utilization with less permanent magnet material.
2Quantity of substance
If the usage of permanent magnet is reduced to reduce the costs, then the costs are reduced, but the output of the linear motor is reduced
Solution Approach 1:
The rotor core is divided into a main core and multiple sub-cores that are spaced apart in the axial direction. The permanent magnets are disposed between these segmented cores, allowing the magnetic field to be distributed and enhanced across multiple regions. This segmentation enables achieving high output with reduced permanent magnet material by creating multiple magnetic interaction zones between the segmented cores and the stator.
Solution Approach 2:
The patent optimizes the spacing distance between sub-cores and the axial length of permanent magnets to maximize magnetic flux density in the air gap. By carefully controlling these dimensional parameters, the magnetic field strength is enhanced despite using less permanent magnet material, thereby maintaining output while reducing costs.
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 enhances the output and efficiency of the linear motor and compressor, reduces material costs, and allows for a more compact design, improving installation flexibility and space utilization.
Implementation Method 1
the rotor may linearly reciprocate by mutual electromagnetic force between the stators
Implementation Method 2
a front sub core disposed in front of each of the plurality of permanent magnets in the axial direction, and a rear sub core spaced apart from the front sub core in the axial direction
Data Source
AI summary
The present invention relates to a linear motor and a linear compressor. A linear motor according to an idea of the present invention comprises: a first stator; a second stator disposed inside the first stator so as to be movable in an axial direction. The mover includes: a plurality of permanent magnets; a front sub core disposed at the front of the plurality of permanent magnets in the axial direction; and a rear sub core spaced from the front sub core in the axial direction so as to be disposed at the rear of the plurality of permanent magnets in the axial direction, wherein the front sub core and the rear sub core are formed to have the same shape.