Drive Assembly Housing Grounding for Electromagnetic Compatibility

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Solution Overview

Problem

Existing electrical drive devices in hybrid motor vehicles face challenges in improving electromagnetic compatibility due to high-frequency electromagnetic fields interfering with radio signals and electronic control devices, and current grounding solutions are costly and labor-intensive.

Innovation Solution

The electrical drive device incorporates protrusions and complementary cut-outs on the housings of the machine unit and power electronics, which are electrically conductive and connected to ground, facilitating assembly and providing a cost-effective grounding solution to enhance electromagnetic compatibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If separate grounding cables with corrosion protection are used to improve electromagnetic compatibility, then electromagnetic compatibility is improved, but manufacturing effort and assembly effort increase significantly

Engineering Contradiction:

Improveelectromagnetic compatibilityVSAvoidmanufacturing effort

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent combines the grounding function with the housing structure by integrating conductive protrusions and cut-outs directly into the machine housing and electronics housing. This merging eliminates the need for separate grounding cables, reducing manufacturing and assembly effort while maintaining electromagnetic compatibility through the integrated conductive path between housings.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The housing structures serve dual functions: mechanical support/positioning and electromagnetic grounding. The protrusions and cut-outs simultaneously provide structural integrity and create electrically conductive connections to ground, allowing the housing to perform multiple functions without requiring additional dedicated grounding components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If separate grounding cables with corrosion protection are used to improve electromagnetic compatibility, then electromagnetic compatibility is improved, but assembly complexity increases

Engineering Contradiction:

Improveelectromagnetic compatibilityVSAvoidassembly complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The grounding function is merged into the housing structure itself through integrated conductive protrusions and cut-outs. This eliminates separate grounding cables and their associated corrosion protection requirements, simplifying the overall device structure and reducing assembly complexity while maintaining electromagnetic compatibility.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The housing structures provide their own grounding capability through the integrated conductive protrusions and cut-outs, eliminating the need for external grounding cables and corrosion protection measures. The housing serves itself by providing both mechanical support and electromagnetic grounding functions.

Inventive Principle:

Principle #25Self-service

3Ease of manufacture

If protrusions and cut-outs are integrated into housings for grounding, then manufacturing cost is reduced and assembly is simplified, but electromagnetic compatibility must be maintained

Engineering Contradiction:

Improvemanufacturing costVSAvoidelectromagnetic compatibility

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent merges the grounding function with the housing structure by integrating conductive protrusions and cut-outs directly into the machine housing and electronics housing. This eliminates the need for separate grounding cables, reducing manufacturing cost while maintaining electromagnetic compatibility through the integrated conductive path between housings.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 improves electromagnetic compatibility by grounding the power electronics and machine unit, reducing electromagnetic interference while being cost-effective and simplifying assembly processes.

Implementation Method 1

the material forming the protrusion and the cut-out is electrically conductive at least in sections and that the protrusion and the cut-out are electrically connected to a ground for the purpose of grounding the power electronics or the machine unit

Methodology Applied

Scientific EffectElectromagnetic field dissipation through grounding: Conduction (electrical)

Data Source

PatentUS12301070B2Electrical drive device and drive assembly

Publication Date: 2025.05.13 SCHAEFFLER TECHNOLOGIES AG & CO KG

AI summary

An electrical drive device includes a machine unit having a machine housing and power electronics having an electronics housing. At least one of the two housings having at least one protrusion for defined positioning of the machine unit and the power electronics against each other during and/or after assembly. The respective other housing having a complementary cut-out in shape and size for receiving the protrusion, wherein material forming the protrusion and the cut-out is electrically conductive at least in some sections. The protrusion and the cut-out are electrically connected to an earth for the purpose of earthing the power electronics or the machine unit.The electrical drive device and the drive assembly equipped therewith allow the electromagnetic compatibility to be optimized in a cost-effective manner.