Linear Compressor Coil Switching for Voltage and Thermal Management
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Solution Overview
Problem
Linear compressors face voltage shortages and temperature increases due to inequality in coil inductance, which affect efficiency and reliability.
Innovation Solution
The implementation of a linear compressor design with a switch unit that connects coils in series or parallel based on load magnitude, ensuring all coils have the same inductance to maintain consistent voltage and prevent temperature issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the number of windings of the coil is increased to reduce current magnitude and improve efficiency, then power loss is reduced, but counter electromotive force and inductance increase causing voltage shortage
Solution Approach 1:
The patent applies dynamics by making the coil connection configuration adjustable rather than fixed. The switch unit enables dynamic switching between series and parallel connections based on operating conditions, allowing the system to adapt coil inductance and current characteristics to match varying load requirements, thereby resolving the contradiction between power loss reduction and voltage maintenance
Solution Approach 2:
The patent changes the electrical parameters of the coil system by switching between series and parallel connections. This parameter change allows the system to adjust total coil inductance and current distribution, enabling operation at optimal efficiency points across different load conditions without suffering from voltage shortage
2Device complexity
If coils have different inductance values, then the existing motor structure can be maintained, but voltage distribution becomes unequal causing temperature increase and reliability reduction
Solution Approach 1:
The patent applies equipotentiality by ensuring equal voltage distribution across all coils through the switch unit configuration. By switching coils in parallel during high-load operations, the system creates equipotential conditions that prevent voltage imbalance, thereby eliminating temperature increase issues and maintaining compressor reliability without requiring perfectly matched coil inductances
3Reliability
If a switch unit is added to connect coils in series or parallel based on load, then voltage shortage and temperature issues are resolved, but device complexity increases
Solution Approach 1:
The switch unit is designed with multi-functionality, serving both as a connection configuration controller and as a means for optimizing motor performance across different operating conditions. This single component performs multiple functions including voltage balancing, current distribution control, and thermal management, thereby justifying the added complexity through significant reliability improvements
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 solution effectively addresses voltage shortages and temperature increases, enhancing the efficiency and reliability of the linear compressor by ensuring consistent power distribution and reducing coil inductance-related issues.
Implementation Method 1
a mover connected to the piston and reciprocating along the axis by an electromagnetic interaction with the coil winding body
Data Source
AI summary
A linear compressor includes a cylinder, a piston disposed in the cylinder and reciprocating along an axis of the cylinder, a stator core disposed outside the cylinder, a coil winding body that is disposed in the stator core and includes first to fourth coils that are spaced from each other in a circumferential direction, a mover connected to the piston and reciprocating along the axis by an electromagnetic interaction with the coil winding body, and a switch unit configured to connect the first and second coils and the third and fourth coils in series or in parallel depending on a magnitude of a load. The first and second coils are connected in series, and the third and fourth coils are connected in series. The first to fourth coils each have the same inductance.