Electromagnetic Brake Noise Reduction via Damping Rings and Spacers
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Solution Overview
Problem
Electromagnetically actuable brakes experience significant noise emissions during operation, particularly during release and application, which existing technologies have not adequately addressed.
Innovation Solution
The brake assembly incorporates an armature disk with damping rings and spacers, where the spacers are designed to prevent direct contact between the armature disk and the coil core, and are arranged to ensure a stable position, reducing noise emissions through their elastic properties and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the armature disk directly contacts the coil core during brake operation, then the braking function is achieved, but noise emissions increase due to direct impact and large-area contact
Solution Approach 1:
Damping rings are introduced as intermediary elements between the armature disk and the coil core. These rings absorb impact energy and reduce the intensity of contact during brake operation, thereby decreasing noise emissions while maintaining the braking function. The damping rings act as a mediator that allows controlled contact without the harmful direct impact of the original design.
Solution Approach 2:
Instead of allowing uniform large-area contact between the armature disk and coil core, the damping rings create localized contact points. This localizes the interaction to specific regions, reducing the overall noise generated by broad surface impacts while maintaining sufficient contact for effective braking.
2Object-affected harmful factors
If spacers are added to prevent direct contact between armature disk and coil core, then noise emissions are reduced, but device complexity increases
Solution Approach 1:
The spacers are integrated directly onto the armature disk, merging the spacer function with the armature disk structure. This combination reduces the number of separate components and simplifies assembly, thereby limiting the increase in device complexity while still achieving the noise reduction benefit of preventing direct contact.
Solution Approach 2:
The spacers serve multiple functions: they prevent direct contact between the armature disk and coil core to reduce noise, and they are elastically prestressed to provide stable positioning of the armature disk. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Ease of operation
If the armature disk is allowed to move freely during operation, then ease of operation is improved, but stability decreases due to wobbling vibrations and unstable stop position
Solution Approach 1:
The spacers are elastically prestressed to apply a counteracting force that stabilizes the armature disk during movement. This elastic prestress acts as a restoring force that counterbalances wobbling vibrations and maintains a stable stop position, thereby improving position stability while allowing the armature disk to move freely during operation.
Solution Approach 2:
The spacers are designed with elastic properties that allow them to dynamically adapt to the movement of the armature disk. The elastic prestress provides continuous stabilization during motion, allowing free movement while maintaining stability. This dynamic behavior enables the system to achieve both ease of operation and position stability.
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 effectively reduces noise emissions during brake operation by utilizing damping rings and spacers to prevent direct contact and stabilize the armature disk, achieving a quieter and more stable braking mechanism.
Implementation Method 1
the armature disk has damping rings on its side facing the coil core
Implementation Method 2
an improved, more stable position is achieved, even if the impact causes wobbling vibrations in the armature disk
Implementation Method 3
one or more spacers being arranged on the armature disk, in particular being connected to the armature disk in a form-fitting and/or non-positive manner
Data Source
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AI summary
Disclosed are an electromagnetically actuated brake assembly as well as an electric motor comprising a brake assembly that includes an armature disk, a shaft, a coil winding and a coil core. On the side facing the coil core, the armature disk is provided with damping rings, the outer diameter of which is smaller than the radial distance to the axis of the shaft that is to be decelerated by the brake assembly. One or more spacing means are arranged on the armature disk, being in particular form-locked and/or force-locked to the armature disk.