Integrated stirling refrigerator
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Solution Overview
Problem
Existing integrated Stirling refrigerators have a large size along the length direction of the eccentric shaft, limiting their compactness and efficiency for use in high-temperature infrared detectors.
Innovation Solution
The design incorporates an axial flux motor with a stator assembly and a rotor assembly, forming a compact structure that reduces the size along the axial direction, enabling a smaller, lighter, and more efficient Stirling refrigerator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If radial flux structure is used for rotary drive, then the Stirling refrigerator can be integrated, but the size along the length direction of the eccentric shaft becomes large
Solution Approach 1:
The patent transitions from a radial flux motor structure to an axial flux motor structure, fundamentally changing the dimensional orientation of the magnetic flux path. In the axial flux configuration, the magnetic flux travels axially through the stator and rotor assemblies, allowing the drive mechanism to be integrated within the eccentric shaft box without extending the eccentric shaft length direction, thus resolving the contradiction between integration and size
2Weight of stationary object
If axial flux motor is adopted, then the size and weight are reduced, but the torque density needs to be increased
Solution Approach 1:
The patent optimizes the axial flux motor parameters including the air gap distance between stator and rotor assemblies, the arrangement of permanent magnets in the rotor, and the winding configuration in the stator to achieve high torque density in a compact, lightweight package
Solution Approach 2:
The patent employs high-performance permanent magnets and magnetic materials in the axial flux motor construction to maximize magnetic field strength and torque output relative to the motor size and weight
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 axial flux motor provides higher torque density compared to conventional radial flux motors, resulting in a more compact, lighter, and lower power consumption Stirling refrigerator, suitable for high-temperature infrared detector applications.
Implementation Method 1
The stator assembly and the rotor assembly form an axial flux motor arranged in the axial direction and configured to drive the eccentric shaft to rotate about the rotation axis through the rotor assembly
Implementation Method 2
The eccentric shaft is provided rotatably around a rotation axis within the sealed cavity and includes an eccentric segment with its center line offset from the rotation axis
Implementation Method 3
The compression link assembly is provided within the sealed cavity and coupled to the eccentric segment. The expansion link assembly is provided within the sealed cavity and coupled to the eccentric segment
Data Source
AI summary
An integrated Stirling refrigerator includes an eccentric shaft box defining a sealed cavity therein filled with a gas medium; an eccentric shaft provided rotatably around a rotation axis within the sealed cavity and including an eccentric segment and a non-eccentric segment; a stator assembly provided around the rotation axis and fixed within the sealing cavity; a rotor assembly arranged on the non-eccentric segment about the rotation axis, with an air gap formed between the stator assembly and the rotor assembly along the axial direction; a compression link assembly arranged within the sealed cavity and coupled to the eccentric segment; and an expansion link assembly arranged within the sealed cavity and coupled to the eccentric segment. The stator assembly and the rotor assembly form an axial flux motor arranged in the axial direction and configured to drive the eccentric shaft to rotate about the rotation axis through the rotor assembly.