Geared air cycle machine fan for aircraft systems
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Solution Overview
Problem
Conventional air cycle machines in aircraft face efficiency losses and increased heat exchanger and machine weight due to difficulty in designing each rotor at peak efficiency, leading to significant performance losses and mechanical bearing issues.
Innovation Solution
The integration of a magnetic assembly with a stator and rotor configuration within the air cycle machine provides a gear ratio between wheel assemblies, offering a bearingless motor with magnetic bearing functionality, eliminating the need for mechanical bearings and allowing for power input, output, and bearing modes of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical bearings are used in air cycle machines, then proper operation is ensured, but particle generation and contact damage occur leading to reduced reliability
Solution Approach 1:
The patent replaces mechanical contact bearings with magnetic bearings that use magnetic fields to support and rotate the shaft without physical contact. This substitution eliminates particle generation from bearing wear while maintaining proper shaft support and operation, directly resolving the contradiction between reliability and harmful particle generation.
2Productivity
If each rotor is designed at peak efficiency with different optimal speeds, then individual rotor performance is maximized, but system complexity and weight increase
Solution Approach 1:
The patent employs a magnetic bearing system that dynamically adjusts magnetic field strength and distribution to accommodate different rotational speeds for each rotor. This allows each rotor to operate at its optimal speed for peak efficiency while the magnetic bearing system adapts to the varying speed requirements, avoiding the need for complex mechanical speed regulation mechanisms.
Solution Approach 2:
The magnetic bearing assembly serves multiple functions simultaneously: it provides bearing support, enables variable speed operation for different rotors, and allows for efficient power transmission. This multi-functionality achieves peak rotor efficiency for each component while avoiding the need for separate mechanical systems for each function, thereby reducing overall system complexity.
3Ease of operation
If mechanical bearings are used to support the shaft, then proper operation is maintained, but weight and maintenance requirements increase
Solution Approach 1:
The patent replaces heavy mechanical bearing structures with lightweight magnetic bearing systems that use electromagnetic fields to support the shaft. This substitution significantly reduces the weight of moving components while maintaining operational stability through contactless magnetic support, eliminating the need for lubrication and reducing maintenance requirements.
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 enhances the efficiency and reliability of air cycle machines by reducing mechanical bearing-related issues, minimizing weight, and optimizing rotor performance, while providing a compact and lightweight design with reduced noise and maintenance needs.
Implementation Method 1
the magnetic assembly comprises a stator assembly fixedly connected to the housing and a rotor assembly rotationally coupled to the shaft
Implementation Method 2
the magnetic assembly is arranged along the shaft to provide a gear ratio between the first wheel assembly and the second wheel assembly
Data Source
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AI summary
Aircraft air cycle machines include a housing (302), a shaft (304) arranged within the housing, and a first wheel assembly (606) operably coupled to the shaft and arranged within the housing. The first wheel assembly is configured to rotationally drive the shaft. A second wheel assembly (608) is operably coupled to the shaft and configured to be rotationally driven by the shaft. A magnetic assembly (618) is arranged within the housing and along the shaft. The magnetic assembly includes a stator assembly (622) fixedly connected to the housing and a rotor assembly (620) rotationally coupled to the shaft. The magnetic assembly is arranged along the shaft to provide a gear ratio between the first wheel assembly and the second wheel assembly.