Hydrogen-Impermeable Coating for Permanent Magnets in Electric Motors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Permanent magnets in electric vehicles exposed to automatic transmission fluid undergo rapid thermal aging due to hydrogen exposure, leading to degradation of magnetic properties, which existing surface coatings fail to mitigate effectively.
Innovation Solution
Applying a hydrogen-impermeable coating or using low-permeability polymers to protect the magnetic particles, such as metals or metal-containing compounds, or incorporating hydrogen-absorbing compounds within the binder material to prevent hydrogen diffusion and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If binder materials with standard permeability are used in compression molded magnets, then ease of manufacture is improved, but hydrogen absorption leads to accelerated thermal aging
Solution Approach 1:
The patent modifies the permeability parameter of the binder material by selecting polymers with specifically low hydrogen permeability. This allows the magnet to maintain ease of manufacture through standard compression molding while achieving improved thermal stability by preventing hydrogen absorption.
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 solution significantly reduces thermal aging of magnets by impeding hydrogen diffusion, thereby preserving the magnetic properties and protecting against environmental degradation agents.
Implementation Method 1
Applying a hydrogen-impermeable coating or using low-permeability polymers to protect the magnetic particles
Implementation Method 2
The barrier material is not selected on the basis of its low permeability to hydrogen
Implementation Method 3
incorporating hydrogen-absorbing compounds within the binder material to prevent hydrogen diffusion and absorption
Data Source
AI summary
An electric motor is provided for use in an electromechanical transmission that utilizes automatic transmission fluid. The electric motor includes a stator and a rotor. The rotor includes a plurality of permanent magnets can include magnetic particles coated with hydrogen impermeable material. According to an alternative embodiment, the entire permanent magnet or the rotor itself can be coated with hydrogen impermeable material. According to a further alternative embodiment, the permanent magnet particles can be secured by a binder that includes a hydrogen storage compound that prevents hydrogen from affecting magnetic properties of the permanent magnet.