Linear motor, compressor equipped with linear motor, refrigerator equipped with compressor, and vehicle air suspension equipped with compressor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing linear motors with asymmetric load characteristics in both directions of a stroke have long movable elements, leading to increased bearing load, reduced service life, and potential deformation due to magnetic attraction forces, which elongate the total system length.
Innovation Solution
A linear motor design featuring a magnetic pole frame with primary and secondary magnets arranged asymmetrically, and a neck part connected to the bearing externally, reducing the distance between bearings and minimizing the overall system length while improving bearing life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three movable element magnetic poles are arranged with respect to two armature magnetic poles and the movable element is made long to accommodate bearings, then the compressor can handle asymmetric load characteristics, but the total system length increases and bearing load increases reducing service life
Solution Approach 1:
The patent applies asymmetry by arranging the three movable element magnetic poles (two permanent magnets and one soft magnetic pole) asymmetrically with respect to the two armature magnetic poles. This asymmetric arrangement allows the motor to handle asymmetric load characteristics in both directions of stroke while maintaining a compact movable element length, thereby resolving the contradiction between adaptability and length.
2Adaptability or versatility
If the movable element is made long to accommodate bearings on both ends, then the compressor can handle asymmetric load characteristics, but the bearing load increases due to increased moment acting on the movable element
Solution Approach 1:
The asymmetric arrangement of magnetic poles allows the motor to generate different thrust characteristics in forward and reverse directions, enabling it to handle asymmetric load characteristics without requiring a long movable element. This reduces the moment arm and consequently the bearing load, resolving the contradiction between adaptability and force.
3Adaptability or versatility
If the movable element is made long, then the compressor can handle asymmetric load characteristics, but the movable element is likely to be deflected by magnetic attraction force causing deformation and breakage
Solution Approach 1:
The asymmetric magnetic pole arrangement creates a more stable magnetic field distribution that reduces lateral magnetic attraction forces on the movable element. This prevents deflection and deformation of the movable element while still enabling asymmetric load handling, resolving the contradiction between adaptability and stability.
4Power
If all three movable element magnetic poles are formed of permanent magnets, then the motor can generate thrust, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent applies local quality by using different materials for different magnetic poles: two permanent magnets for positions requiring strong magnetic fields and one soft magnetic pole for position where magnetic field guidance is sufficient. This differentiation maintains thrust generation capability while reducing manufacturing cost and complexity, resolving the contradiction between power and ease of manufacture.
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
The design enhances bearing service life and reduces the total system length by optimizing the arrangement of magnets and bearings, allowing for efficient operation with asymmetric load characteristics.
Implementation Method 1
A linear motor, which is a thrust generation mechanism, causes a movable element to generate thrust by a magnetic force acting between magnetic poles formed in a stator and the movable element
Implementation Method 2
a plurality of armature magnetic poles around which windings are wound and that are provided so as to sandwich the field element
Data Source
AI summary
A linear motor for a compressor having asymmetric load characteristics in both directions of a stroke, improves the service life of a bearing, and reduces a total length of a system. The linear motor includes a movable element having a magnetic pole frame and a plurality of field element poles, and a plurality of magnetic pole teeth around which windings are wound and that are provided so as to sandwich the movable element, and the movable element and the magnetic pole teeth are relatively displaced. The plurality of field element poles include primary magnets arranged between the plurality of magnetic pole teeth and secondary magnets arranged externally relative to spaces between the plurality of magnetic pole teeth in either direction of the relative displacement. A neck part of the magnetic pole frame connected to a bearing is arranged externally in the other direction of the relative displacement direction.