Rotational Coupling Device Torsional Vibration
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Solution Overview
Problem
Conventional rotational coupling devices, such as clutches and brakes, suffer from inefficient magnetic circuits, wear issues, and suboptimal mounting of conductors, leading to poor performance and structural weaknesses.
Innovation Solution
The rotational coupling device improves magnetic efficiency and structural integrity by securing the conduction assembly at the outer diameter of the field shell, optimizing the placement of inner and outer poles, and using permanent magnets to enhance wear resistance and magnetic circuit efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the conduction assembly is mounted proximate the inner diameter of the field shell, then the device structure is simpler, but the resistance to torsional vibration is insufficient
Solution Approach 1:
The conduction assembly is relocated from the inner diameter region to the outer diameter region of the field shell, representing a spatial dimension change in the mounting arrangement. This dimensional shift allows the assembly to be positioned at a larger radial distance from the rotation axis, thereby increasing resistance to torsional vibration while maintaining structural simplicity through the extended flange configuration.
2Use of energy by moving object
If the inner pole of the rotor is positioned radially inwardly, then the magnetic circuit path is shorter, but the magnetic efficiency is reduced
Solution Approach 1:
The inner pole of the rotor is positioned radially outwardly relative to the inner pole of the field shell, creating a localized optimization in the magnetic circuit configuration. This positional adjustment improves magnetic efficiency by optimizing the flux distribution and reducing leakage, while the overall path length increase is compensated by the enhanced magnetic coupling in the localized region.
3Strength
If the conduction assembly is secured with fewer connection points, then the manufacturing process is simpler, but the structural integrity is compromised
Solution Approach 1:
The shell of the conduction assembly is provided with a radially outwardly extending flange that is pre-configured with connection points for affixing to the field shell. This preliminary structural preparation enables straightforward attachment at multiple points around the outer diameter, achieving both high structural integrity and ease of manufacture through the integrated flange design.
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 enhances magnetic efficiency, reduces wear, and improves structural strength, enabling better torque transfer and braking performance while minimizing torsional vibrations.
Implementation Method 1
Energizing the conductor produces a magnetic circuit in the field shell, rotor and armature that draws the armature into engagement with the rotor
Implementation Method 2
Permanent magnets coupled to the brake plate are also used to create another magnetic circuit between the brake plate, the field shell and the armature to assist the leaf springs in braking the armature and output member
Data Source
Figure 1
Figure 2~7
Figure 3~6
AI summary
A rotational coupling device (20) for use as a clutch and/or brake is provided having improved magnetic efficiency and structural integrity. An electrical conduction assembly (32) is disposed within a field shell (30) between radially spaced inner (68) and outer (72) poles of the field shell. The assembly includes a conductor (84) disposed within a shell (86) having a radially extending flange (92) that is disposed proximate the outer pole (72) of the field shell and that is affixed to the field shell at a plurality of points .