Electromagnetic Brake Unit Polymer Contact Surface Wear
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Solution Overview
Problem
Existing electromagnetic brake units in rotary input devices face issues with maintaining a good operation feeling during non-braking and ensuring reliable braking force, as the smooth and hard thin film layer on the contact surfaces wears out due to sliding and micro-vibration, leading to scratches and a caught feeling during operation.
Innovation Solution
The electromagnetic brake unit incorporates a polymer material section on at least one of the adsorbed and adsorbing surfaces, which reduces scratching and maintains a smooth operation by providing a softer interface that minimizes wear and prevents the feeling of being caught, even when the polymer material wears out, and includes a speed multiplication mechanism using a planetary gear system to enhance rotational speed and braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smooth and hard thin film layer is formed on the contact surface by PVD method, then braking force is maintained and operation feeling is improved, but the film layer wears out due to sliding and micro-vibration causing scratches and caught feeling
Solution Approach 1:
The patent applies a composite material structure consisting of a metal substrate (rotating plate or electromagnetic brake) combined with a polymer material layer on the contact surface. This composite structure combines the strength and magnetic properties of metal with the low wear and smooth surface properties of polymer, resolving the contradiction between maintaining braking force and extending service life.
Solution Approach 2:
The patent changes the material parameter of the contact surface from hard metal/PVD coating to a softer polymer material. This parameter change reduces the coefficient of friction and wear rate, preventing the formation of wear debris that causes scratches and caught feeling, thus extending the service life while maintaining adequate braking force.
2Force
If electromagnetic brake magnetically adsorbs rotating plate, then braking force is applied, but wear debris accelerates sliding wear and causes scratches
Solution Approach 1:
The patent changes the material parameter of the contact surface from hard metal to a softer polymer material. This parameter change reduces the coefficient of friction and wear rate, preventing the formation of wear debris that causes scratches and caught feeling, thus extending the service life while maintaining adequate braking force.
Solution Approach 2:
The patent converts the potential harm of polymer material wear into a benefit: the polymer wear debris is softer and less abrasive than metal wear debris, and the continuous contact between polymer surfaces creates a lubricating effect that reduces further wear and prevents scratch formation.
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 ensures a consistent good operation feeling and maintains a sufficient braking force by reducing wear and preventing scratches, while avoiding adsorption issues due to moisture interposition, and provides high durability against frictional heat, ensuring stable operation and braking performance.
Implementation Method 1
an electromagnetic brake that is placed to be in contact with the rotating plate and can magnetically adsorb the rotating plate
Implementation Method 2
a polymer material section is formed on at least one of the adsorbed surface and the adsorbing surface
Data Source
AI summary
A magnetic brake unit includes an operation unit, a rotating plate placed below the operation unit and coaxially rotating with the operation unit in conjunction with an operation of the operation unit, and an electromagnetic brake that is placed to be in contact with the rotating plate and can magnetically adsorb the rotating plate, in which the rotating plate includes an adsorbed surface in contact with the electromagnetic brake, the electromagnetic brake includes an adsorbing surface in contact with the rotating plate, the electromagnetic brake applies a braking force against a pivoting to the rotating plate when the electromagnetic brake magnetically adsorbs the rotating plate, the rotating plate is pivotable in a state of being in contact with the electromagnetic brake when the electromagnetic brake does not magnetically adsorb the rotating plate, and a polymer material section is formed at least one of the adsorbed surface and the adsorbing surface.