Rotating Electric Machine Housing Layout for Lightning Current Bypass

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Solution Overview

Problem

When a rotating electric machine system is struck by lightning, there is a risk of current flowing into the system, potentially damaging electrical components.

Innovation Solution

The system is designed with retaining members spaced apart in the circumferential direction of the rotating electric machine housing to direct current away from electrical components, and the internal combustion engine is supported by axially displaced retaining members to minimize heat transfer and vibration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the rotating electric machine system is installed in a structural body that may be struck by lightning, then the system can be deployed for practical use, but electrical components may be damaged by lightning-induced current flowing through support members

Engineering Contradiction:

Improvedeployability of rotating electric machine systemVSAvoidprotection of electrical components from lightning damage

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent extracts the electrical component from the direct current pathway by positioning it away from the portion between retaining members. The support members and retaining members form a current path that bypasses the electrical component, effectively separating the electrical component from the lightning-induced current flow path.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The retaining members and support members act as intermediary elements that intercept and redirect lightning-induced current away from the electrical component. The current flows through the retaining members and support members instead of through the electrical component, protecting it from damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If retaining members are provided on the outer circumferential portion of the rotating electric machine housing, then the system can be securely retained by the structural body, but the electrical component may be exposed to lightning-induced current flowing through the housing

Engineering Contradiction:

Improveretention strength of rotating electric machine housingVSAvoidexposure to lightning-induced current

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating a specific safe zone around the electrical component where lightning-induced current does not flow. The electrical component is positioned in a location away from the current path formed by the retaining members and support members, ensuring localized protection while maintaining overall structural integrity.

Inventive Principle:

Principle #3Local quality

3Strength

If the internal combustion engine is retained by support members, then the engine can be securely mounted, but heat and vibration from the engine may affect the rotating electric machine system

Engineering Contradiction:

Improvemounting security of internal combustion engineVSAvoidheat transfer from combustor to rotating electric machine system

Core Design Contradiction:

StrengthVSTemperature

Solution Approach 1:

The patent segments the mounting system by providing separate support members for the rotating electric machine system and the internal combustion engine. This segmentation allows independent optimization of each system's mounting while minimizing thermal and vibrational interference between them.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12580461B2Rotating electric machine system and combined power system

Publication Date: 2026.03.17 HONDA MOTOR CO LTD

AI summary

A combined power system includes a rotating electric machine system. The rotating electric machine system includes a rotating electric machine and a rotating electric machine housing. A first retaining member and a second retaining member are provided on an outer circumferential portion of the rotating electric machine housing in order to retain the rotating electric machine housing by a support member provided in a structural body in which the rotating electric machine system is installed. An electrical component is disposed at a position on the outer circumferential portion of the rotating electric machine housing, and the position is separated from the portion between the first retaining member and the second retaining member.