Rotatory Device End Cap with Unpackaged Capacitor EMI Suppression
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Solution Overview
Problem
Conventional rotatory devices face challenges in effectively suppressing noise and electromagnetic interferences (EMI) due to the limitations of capacitors, which can be unstable at high temperatures and occupy valuable space, increasing manufacturing costs.
Innovation Solution
Incorporating unpackaged capacitors between the end cap and housing of the rotatory device, where the metallic components are electrically coupled to brushes and grounded to the housing, forming a capacitor element that reduces EMI without additional space or cost, utilizing a dielectric component between the metallic components for effective insulation and energy storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional packaged capacitors are used to suppress EMI, then noise and electromagnetic interferences are reduced, but the device occupies valuable space and increases manufacturing costs
Solution Approach 1:
The capacitor is extracted from its conventional packaged form and integrated directly into the end cap structure. The capacitor elements are formed as conductive traces or plates on the end cap itself, eliminating the need for separate packaged capacitor components and their mounting space.
Solution Approach 2:
The capacitor function is merged with the end cap structure. The end cap serves dual purposes: as a mechanical housing component and as an EMI suppression element through integrated capacitor traces. This combines structural and electrical functions into a single component.
2Object-affected harmful factors
If conventional packaged capacitors are used to suppress EMI, then noise and electromagnetic interferences are reduced, but manufacturing costs increase
Solution Approach 1:
The capacitor function is merged with the end cap structure. The end cap serves dual purposes: as a mechanical housing component and as an EMI suppression element through integrated capacitor traces. This combines structural and electrical functions into a single component, eliminating separate capacitor purchases and assembly steps.
Solution Approach 2:
The end cap structure itself provides the capacitor function through its conductive traces and dielectric layers. The structure serves itself by incorporating EMI suppression capabilities directly into its design, eliminating the need for external capacitor components.
3Object-affected harmful factors
If standard capacitors are used for EMI suppression, then noise reduction is achieved, but capacitance stability at high temperatures deteriorates
Solution Approach 1:
The dielectric material parameters are selected to maintain stable capacitance characteristics across high temperature ranges. The end cap structure uses materials with temperature-compensating properties to ensure capacitance stability under elevated operating conditions.
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 effectively suppresses EMI, maintains capacitance stability at elevated temperatures, and reduces the overall size of the device, thereby lowering production costs without compromising performance.
Implementation Method 1
at least one unpackaged capacitor including a first metallic component electrically coupled to the brush assembly, a second metallic component grounded to the housing, and a dielectric component at least a part of which is enclosed between the first metallic component and the second metallic component to form a capacitor element
Data Source
AI summary
A rotatory device (1) for energy conversion between electrical energy and mechanical energy includes an end cap (20) to which electric conduction and commutation components (30) are attached. The end cap (20) is electrically insulating and has a flange mating to an electric conductive housing (10) of the rotatory device (1). An unpackaged capacitor (40) is positioned between the housing (10) and the flange (20) without occupying other space inside the housing (10) of rotatory device (1). The unpackaged capacitor (40) is electrically coupled to the electric conduction and commutation component and grounded to the housing (10) of the rotatory device (1).