Driving unit and linear compressor including the same
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Solution Overview
Problem
The challenge is to reduce the size and height of the driving unit in linear compressors while maintaining stable output and reducing interference between components, while also improving manufacturing efficiency and cost-effectiveness.
Innovation Solution
The solution involves a driving unit design with an inner stator, a bobbin, a coil, and a configuration of stator cores and permanent magnets arranged in a specific pattern to minimize size and height, including a cross-sectional shape with straight and curved portions, and strategically placing stator cores and permanent magnets to reduce interference and optimize manufacturing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the linear motor is reduced, then the overall size of the linear compressor is reduced, but the output of the linear motor is reduced
Solution Approach 1:
The patent changes the bobbin cross-section from a conventional circular shape to a shape with straight portions and curved portions. This dimensional redesign allows the stator cores to be positioned more efficiently in the circumferential direction, increasing the number of stator cores without increasing the overall motor size, thereby maintaining output while reducing compressor size.
Solution Approach 2:
The patent divides the stator into multiple stator cores (at least three) that are spaced apart in the circumferential direction. This segmentation allows for optimized magnetic field distribution and enables the use of multiple permanent magnets, improving the motor's power density and maintaining output in a compact design.
2Length of stationary object
If the height of the driving unit is reduced, then the overall height of the linear compressor is reduced, but the output stability of the driving unit deteriorates
Solution Approach 1:
The patent introduces curved portions in the bobbin cross-section that connect the straight portions. These curved portions provide optimal positioning for the permanent magnets and stator cores, ensuring stable magnetic field generation and consistent motor output even in a reduced-height configuration.
3Volume of moving object
If the size of the linear motor is reduced, then the overall size of the linear compressor is reduced, but interference between components increases
Solution Approach 1:
The patent employs an asymmetric bobbin cross-section with straight portions and curved portions, allowing asymmetric arrangement of stator cores and permanent magnets. This asymmetric design optimizes the spatial distribution of components, minimizing interference between the oil feeder, terminal portion, and stator cores while maintaining compact dimensions.
4Ease of manufacture
If the configuration of the driving unit is simplified, then the manufacturing cost is reduced, but the output stability of the driving unit deteriorates
Solution Approach 1:
The patent applies different geometric characteristics to different parts of the bobbin cross-section: straight portions for structural simplicity and ease of manufacturing, and curved portions for optimal magnetic field generation. This local differentiation maintains output stability while simplifying the overall configuration and reducing manufacturing 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 design effectively reduces the overall size and height of the linear compressor, maintains stable output, minimizes interference between components, and enhances manufacturing efficiency and cost-effectiveness by optimizing the arrangement of stator cores and permanent magnets.
Implementation Method 1
a coil wound on the bobbin
Implementation Method 2
reciprocating at high speed inside the cylinder by the resonance spring
Data Source
Figure 1
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AI summary
A driving unit and a linear compressor including the same are provided. The driving unit includes an inner stator, a bobbin surrounding the inner stator in a circumferential direction, a coil wound on the bobbin, a plurality of stator cores surrounding the bobbin and spaced apart from each other in the circumferential direction, and a plurality of permanent magnets disposed between the inner stator and the plurality of stator cores. A cross section of the bobbin may include a pair of straight portions facing each other and a curved portion connecting the pair of straight portions.