Lid-Closure for Wound Capacitors with Tolerance Compensation

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Solution Overview

Problem

Existing cover closures for wound capacitors in cups are limited in accommodating capacitors with different diameters and heights, requiring separate encapsulation and lacking flexibility to compensate for manufacturing tolerances, while also not providing sufficient air and creepage distances in a compact design.

Innovation Solution

A cover closure with a plate-shaped plastic part featuring a centering pin, flexible arcuate elements for height compensation, and an insulating body with screw connections, allowing for standard prefabricated covers that can secure and center capacitor windings, provide large air and creepage distances, and maintain gas-tightness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a standard prefabricated cover closure is used, then manufacturing cost and complexity are reduced, but the ability to accommodate capacitors with different diameters and heights is limited

Engineering Contradiction:

Improvemanufacturing cost and complexityVSAvoidability to accommodate different capacitor dimensions

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The cup-shaped cover is designed with a deformable material that allows dynamic adaptation to different capacitor winding dimensions. The flexible material enables the cover to conform to various diameters and heights while maintaining sealing and mechanical support, thus accommodating different capacitor sizes with a single standardized cover design.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The cover closure system allows for parameter changes in capacitor dimensions (diameter and height) while maintaining a standardized cover design. The deformable material and flexible sealing elements enable the same cover structure to adapt to varying physical parameters of different capacitor windings.

Inventive Principle:

Principle #35Parameter changes

2Strength

If the cup rim is bent around to secure the winding, then mechanical fixation is achieved, but separate encapsulation is required and flexibility is reduced

Engineering Contradiction:

Improvemechanical fixationVSAvoidseparate encapsulation requirement

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The cup-shaped cover integrates multiple functions into a single component: it provides mechanical fixation of the capacitor winding through its deformable structure, ensures gas-tight sealing, and eliminates the need for separate encapsulation. The flanged connection with the cup rim combines structural support and sealing functions in one integrated solution.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The cup-shaped cover serves multiple functions simultaneously: it acts as a mechanical support structure, provides gas-tight sealing, secures the capacitor winding, and replaces the need for separate encapsulation. This multi-functional design simplifies the overall device complexity while maintaining strong mechanical fixation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Volume of moving object

If a compact design is used to reduce installation space, then air and creepage distances are reduced, but electrical safety is compromised

Engineering Contradiction:

Improveinstallation spaceVSAvoidair and creepage distances

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The plate-shaped plastic part is designed with locally optimized features including integrated insulation and structured geometry that provides adequate air and creepage distances in critical areas. The insulating body with screw connections and the deformable cover material create localized insulation barriers that maintain electrical safety requirements while keeping the overall design compact.

Inventive Principle:

Principle #3Local quality

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

Enables the assembly of different capacitor windings with improved mechanical and electrical properties, including secure fixation, tolerance compensation, and reduced self-inductance in a compact, gas-tight design without separate encapsulation.

Implementation Method 1

the underside of the plate-shaped plastic part has a plurality of flexible, tongue-like, arcuate elements having spring-elastic properties, which are used to fix the respective capacitor winding to compensate for tolerances

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

At least one seal (10) made of an electrically insulating material is present between the cover (9) and the connection fitting (1)

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentEP3432330B1Lid-closure for wound capacitors in a container

Publication Date: 2019.11.20 ELECTRONICSON KONDENSATOREN

Figure 1a~1b
Figure 1c
Figure 2a~2c

AI summary

The invention relates to a lid closure for wound capacitors that can be arranged in a cup, comprising at least one electrical connection fitting, designed as an insulated lid feedthrough and consisting of a plate-shaped plastic part to which the connection fitting is attached. According to the invention, a centering pin molded onto the underside of the plate-shaped plastic part extends towards the capacitor winding. Furthermore, the underside of the plate-shaped plastic part has several flexible, tongue-like, spring-elastic, arc-shaped elements for tolerance-compensating fixation of the respective capacitor winding.