Eddy Current Brake Assembly for Aircraft Wheel Rim Wear Reduction
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Solution Overview
Problem
Conventional aircraft brakes rely on friction, leading to high wear rates, frequent maintenance, and increased CO2 emissions, posing logistical, financial, and safety burdens on operators and airlines.
Innovation Solution
A magnetic brake assembly using a rotor and stator with a magnetic array and electrically conductive body to induce eddy currents for braking, reducing wear and integrating a friction brake for low-speed support, allowing for low-maintenance and low-wear operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional friction brakes are used, then braking force is achieved, but wear rate increases and maintenance frequency increases
Solution Approach 1:
The patent replaces the conventional friction-based mechanical braking system with an electromagnetic eddy current braking system. The electromagnetic brake uses a magnetic field to induce eddy currents in a conductive rotor, creating a magnetic drag force that slows the wheel without physical contact between brake pads and rotor. This substitution eliminates wear of brake pads while maintaining effective braking force, directly resolving the contradiction between achieving braking force and minimizing wear.
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary between the brake actuator and the rotor. Instead of direct mechanical contact, the electromagnetic field serves as the mediator that transfers energy from the actuator to the rotor through induction, creating braking force without physical wear. The friction brake component acts as a secondary intermediary for low-speed support, combining both braking mechanisms to optimize performance across different speed ranges.
2Object-affected harmful factors
If carbon disc brakes are used, then braking performance is achieved, but CO2 emissions increase due to frequent replacement
Solution Approach 1:
The patent replaces carbon disc friction brakes with an electromagnetic eddy current braking system that has no consumable friction materials. Since the electromagnetic brake produces braking force through magnetic field interaction rather than friction, there are no brake pads to wear and replace. This eliminates the need for frequent brake replacements that generate CO2 emissions from manufacturing and transportation, while also eliminating carbon dust emissions from brake wear.
Solution Approach 2:
The patent converts the harmful effect of friction (which causes wear and emissions) into a beneficial electromagnetic interaction. By using electromagnetic induction to create braking force, the system eliminates the harmful byproducts of friction-based braking (wear debris, carbon dust, frequent replacements) while maintaining effective braking performance. The friction brake is retained only as a supplement for low-speed conditions where eddy current braking is less effective.
3Ease of operation
If friction brakes are used, then braking force is achieved, but maintenance complexity increases
Solution Approach 1:
The patent replaces the complex friction brake maintenance system with a simpler electromagnetic braking system. The eddy current brake has no wear-prone friction materials, meaning no periodic pad replacements, no dust contamination issues, and no complex adjustment procedures. The electromagnetic system requires minimal maintenance beyond routine electrical system checks, significantly simplifying the maintenance process while maintaining reliable braking force.
Solution Approach 2:
The electromagnetic braking system is inherently self-maintaining in that it produces no wear debris, generates no friction heat that degrades materials, and has no friction surfaces that require adjustment or replacement. The system simply operates until the electromagnetic components reach their operational lifespan, at which point replacement is straightforward without the complex procedures required for friction brake maintenance.
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 magnetic brake assembly significantly reduces wear and maintenance needs, decreases CO2 emissions, and enhances operational readiness and safety by providing a low-wear, efficient braking system for aircraft.
Implementation Method 1
the magnetic array induces eddy currents in the electrically conductive body to cause a magnetic braking force
Implementation Method 2
the magnetic array induces eddy currents in the electrically conductive body to cause a magnetic braking force
Implementation Method 3
a magnetic array including a plurality of magnets configured to generate a magnetic flux
Implementation Method 4
integrating a friction brake for low-speed support
Data Source
AI summary
A magnetic brake assembly for use with a wheel rim is described. The brake assembly includes a rotor secured to rotate with the rim and a stator secured to be rotationally stationary relative to the rotor. One of the rotor and stator has an electrically conductive body and the other of the rotor and stator has a magnetic array including a plurality of magnets configured to generate a magnetic flux. An actuator is connected to at least one of the electrically conductive body and magnetic array to selectively effect a brake mode and a non-brake mode. In the brake mode, the magnetic array induces eddy currents in the electrically conductive body to generate a magnetic braking force when the rim rotates above a threshold speed and in the non-brake mode, the induced eddy currents cause a negligible or no magnetic braking force as the rim rotates above the threshold speed.