Electromagnetic Brake Armature Sheets for Faster Quiet Shaft Locking
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Solution Overview
Problem
Existing electromagnetic braking devices for mobility systems like elevators and forklifts are inefficient and noisy during transitions between braking and release configurations, and they take too long to switch between these states.
Innovation Solution
The device employs a configuration with independent magnetic sheets that deform under mechanical and electromagnetic actuation, allowing for faster transitions and reduced noise by using mechanical springs and electromagnetic forces to control the movement of the armature and sheets relative to the external part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a solid metal block armature is used in the electromagnetic braking device, then the structure is simple, but the switching time between braking and release configurations is too long and noise is generated during transitions
Solution Approach 1:
The solid metal block armature is segmented into multiple independent magnetic sheets that can move and deform independently. This segmentation allows the sheets to be sequentially actuated by the electromagnetic force, enabling faster transition from braking to release configuration without requiring the entire armature to move as a single mass.
Solution Approach 2:
The magnetic sheets are designed to be flexible and capable of dynamic deformation rather than rigid movement. The sheets can bend and flex under electromagnetic actuation, allowing for faster response time and smoother transitions between states, reducing both switching time and mechanical noise.
2Ease of manufacture
If a solid metal block armature is used in the electromagnetic braking device, then the manufacturing is simple, but noise is generated during transitions between braking and release configurations
Solution Approach 1:
The armature is divided into multiple thin magnetic sheets that can deform independently. This segmentation distributes the mechanical stress and movement across multiple smaller elements, reducing the impact noise generated during transitions while maintaining manufacturing feasibility through standard sheet metal fabrication processes.
Solution Approach 2:
The magnetic sheets are designed as flexible thin elements that can bend and deform under electromagnetic actuation. This flexibility allows for smoother, quieter transitions compared to rigid metal blocks, as the thin sheets can flex rather than slam against each other during state changes.
3Reliability
If mechanical springs are used to actuate the armature, then the braking force is reliable, but the transition time from braking to release configuration is prolonged
Solution Approach 1:
The armature is segmented into multiple magnetic sheets that can be sequentially actuated. The mechanical springs continue to provide reliable braking force by acting on the stacked sheets, while the electromagnetic force can rapidly release the sheets one by one, achieving fast transition without compromising braking reliability.
Solution Approach 2:
The device combines mechanical spring actuation for reliable braking with electromagnetic actuation for rapid release. The mechanical springs ensure consistent braking force during the held state, while the electromagnetic system enables quick transition to the release state, merging the advantages of both actuation methods.
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 configuration reduces the time taken to switch between braking and release configurations, minimizing noise and ensuring safe and efficient operation.
Implementation Method 1
an armature movable in a first direction under the action of an electromagnetic force generated by an electric coil housed in the body
Implementation Method 2
an armature movable in a first direction under the action of a force exerted by one or more compression springs also partially housed in the body
Implementation Method 3
the magnetic metal sheets which deform successively under the simultaneous action of the at least one mechanical actuating member
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to an electromagnetic braking device configured to block a rotating shaft (7), comprising a friction disc (15) mounted movably in translation and rotation and configured to be fixed to the rotating shaft, an external part (10) and an intermediate part (14) mounted movably in translation between the friction disc and the external part, at least one of the external or intermediate part being magnetic, at least one electromagnetic actuation member (22) and at least one mechanical actuation member which are housed in the other of the external or intermediate part, the intermediate part being configured to move in a first direction called braking towards the friction disc when it is under the action of at least one mechanical actuation member,and in a second direction opposite to the first direction towards the external part when the intermediate part is under the action of at least one electromagnetic actuating element, and a plurality of independent magnetic sheets (16) movable in translation between the intermediate part and the external part when they are under the action of at least one mechanical actuating element and/or under the action of at least one electromagnetic actuating element.