Linear Motor Stator Segmentation for Iron Loss Reduction
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Solution Overview
Problem
Conventional linear compressors experience inefficiency due to iron loss of flux generated around the coil, which degrades motor efficiency and increases costs when attempting to mitigate this with non-magnetic materials.
Innovation Solution
The linear motor design involves an inner stator with core blocks and an outer stator with core guides, where the coil is wound around both inner and outer circumferences of the core blocks, with insulation segments to prevent flux flow, and the coil is wound in opposite directions on adjacent core blocks to reduce iron loss and increase inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If non-magnetic materials are used to mitigate iron loss, then iron loss is reduced, but manufacturing cost increases
Solution Approach 1:
The stator core is divided into multiple core blocks arranged in a circumferential direction, with insulation segments positioned between adjacent core blocks. This segmentation prevents flux from flowing through the frame and stationary member, reducing iron loss without requiring non-magnetic materials for the entire structure.
Solution Approach 2:
Insulation segments are introduced as intermediary elements between adjacent core blocks in the inner stator. These insulation segments act as barriers to flux flow, preventing the formation of closed magnetic loops through the frame and stationary member, thereby reducing iron loss while maintaining a cost-effective design.
2Power
If coil is wound around core blocks, then electromagnetic force is generated, but iron loss occurs due to flux flow through frame and stationary member
Solution Approach 1:
The inner stator consists of multiple core blocks arranged circumferentially with insulation segments between them. This segmentation interrupts the magnetic flux path, preventing flux from flowing through the frame and stationary member while still allowing the coil to generate electromagnetic force effectively.
Solution Approach 2:
Insulation segments are strategically placed at specific locations between adjacent core blocks where flux would otherwise flow through the frame and stationary member. This localized intervention prevents iron loss without affecting the overall electromagnetic force generation capability of the motor.
3Loss of energy
If insulation segments are added between core blocks, then flux flow is prevented and iron loss is reduced, but device complexity increases
Solution Approach 1:
The stator core is segmented into multiple core blocks with insulation segments between them. This segmentation approach systematically addresses flux flow issues while maintaining a modular structure that is relatively easy to manufacture and assemble.
Solution Approach 2:
The stator core combines magnetic core blocks with non-magnetic insulation segments to create a composite structure. This composite design prevents flux leakage through the frame and stationary member while maintaining electromagnetic performance, balancing complexity reduction with effectiveness.
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 iron loss and improves motor efficiency by redirecting flux flow, lowering costs and enhancing productivity while increasing inductance, resulting in a more efficient linear compressor.
Implementation Method 1
When a current flows in the coil, a flux is generated around the coil to a mutual electromagnetic force
Implementation Method 2
a flux is generated around the coil to a mutual electromagnetic force
Implementation Method 3
insulation segments to prevent flux flow
Data Source
AI summary
The present invention relates to a linear motor for a linear compressor reciprocating a moving member linearly inside a stationary member to compress refrigerant, and more particularly, to a linear motor for a linear compressor capable of decreasing an iron loss of a flux generated when a current flows in a coil and increasing an inductance. A linear motor for a linear compressor includes an inner stator formed by stacking core blocks in a circumference direction to be insulated from each other, an outer stator formed by arranging core blocks in a circumference direction at a predetermined intervals, and winding a coil around the core blocks, and a plurality of permanent magnets formed between the inner stator and the outer stator with a predetermined gap, and reciprocated linearly due to a mutual electromagnetic force.