Radial Slide Electromagnetic Brake for Silent Operation
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Solution Overview
Problem
Conventional electromagnetic brakes used in hoisting machines of elevators generate noise due to the abutment of the armature with the flange, which is undesirable for user experience.
Innovation Solution
An electromagnetic brake design featuring a slide that moves radially relative to a ring-shaped electromagnet, maintaining a constant perpendicular distance and avoiding direct contact, utilizing a magnetic field with projections and a permanent magnet to facilitate silent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a damper spring is provided to reduce noise, then noise is reduced, but the spring force increases requiring higher magnetic force
Solution Approach 1:
The harmful abutting action is extracted by separating the slide from the flange in the radial direction, maintaining a constant perpendicular distance through guided linear movement. This eliminates the noise-generating contact while preserving the magnetic braking function.
Solution Approach 2:
Guiding means act as an intermediary mechanism that constrains the slide to move only in the radial direction relative to the armature, preventing perpendicular contact with the flange. This mediator ensures silent operation while maintaining operational effectiveness.
2Force
If the armature abuts on the flange to provide braking force, then braking effectiveness is improved, but noise is generated
Solution Approach 1:
The braking function is segmented from the radial movement function. The slide provides radial adjustment while the friction member contacts the braking surface for force application. This segmentation allows force transmission without the harmful abutting noise.
Solution Approach 2:
The direct mechanical abutment between armature and flange is replaced with a magnetic field-based system. The electromagnet generates magnetic force to move the slide radially, and the friction member applies braking force to the braking surface, eliminating the noisy mechanical impact.
3Object-affected harmful factors
If the slide moves radially to maintain constant perpendicular distance, then noise is eliminated, but structural complexity increases
Solution Approach 1:
The guiding means are merged with the existing electromagnetic brake structure, integrating the noise-prevention function into the radial movement mechanism. This combination adds minimal complexity while achieving silent operation.
Solution Approach 2:
The guiding means serve multiple functions: they constrain radial movement, maintain constant perpendicular distance, and prevent contact between the slide and flange. This multi-functionality reduces the need for separate components, minimizing structural complexity.
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 design ensures silent operation by maintaining a consistent distance between the slide and electromagnet, reducing noise and allowing for efficient magnetic force application without the need for increased spring forces, thus providing a quieter braking mechanism.
Implementation Method 1
The electromagnet can provide an electromagnetic force when the coil 105 is excited so as to attract the armature 103
Implementation Method 2
the electromagnet comprises a coil wound about the central axis and adapted to generate a magnetic field upon excitation
Data Source
AI summary
An electromagnetic brake comprises an electromagnet arranged about a central axis SA; a slide movable with respect to the electromagnet in a slide actuation direction upon actuation of the electromagnet, and an air gap provided between the electromagnet and the slide through which a magnetic field passes when the electromagnet is actuated, wherein the slide is arranged radially inside or outside of the electromagnet with respect to the central axis SA. The electromagnetic brake is silent.