Controlling Device Integrated Rotating Electric Machine Resin Sealing

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Solution Overview

Problem

Controlling device integrated rotating electric machines face issues with resin sealing, which can lead to the destruction of smoothing condensers due to trapped gases, reducing their lifespan and reliability in humid and vibrating environments.

Innovation Solution

The design includes a heat sink with a container portion that prevents resin from sealing the outside of smoothing condensers, allowing gas exhaustion and enhancing the device's resistance to humidity and vibration by using power supply and grounding wirings to join the smoothing condenser with the case, ensuring it is contained within the heat sink's container portion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If resins are injected into the room to seal the controlling device, then resistance to humidity is improved, but smoothing condensers are sealed and gases cannot be exhausted leading to destruction

Engineering Contradiction:

Improveresistance to humidityVSAvoidgas accumulation inside smoothing condenser

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The heat sink is divided into a sealing portion and a container portion. The container portion specifically houses the smoothing condensers and is designed with gas exhaustion holes, while the sealing portion is sealed with resin. This segmentation allows different functional requirements to be met simultaneously: humidity protection through sealing and gas exhaustion through dedicated holes in the container portion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The container portion of the heat sink acts as an intermediary structure between the sealing resin and the smoothing condensers. It provides a protected environment for the condensers while maintaining gas exhaustion pathways, mediating between the need for resin sealing and the need for gas venting.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Duration of action of stationary object

If resins are used to seal the controlling device, then lifetime to vibration is improved, but smoothing condensers are sealed and gases cannot be exhausted

Engineering Contradiction:

Improvelifetime to vibrationVSAvoidgas accumulation inside smoothing condenser

Core Design Contradiction:

Duration of action of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The heat sink is divided into a sealing portion and a container portion. The container portion specifically houses the smoothing condensers and is designed with gas exhaustion holes, while the sealing portion is sealed with resin. This segmentation allows different functional requirements to be met simultaneously: vibration protection through resin sealing and gas exhaustion through dedicated holes in the container portion.

Inventive Principle:

Principle #1Segmentation

3Reliability

If smoothing condensers are sealed with resin, then resistance to humidity is improved, but internal pressure increases and leads to condenser destruction

Engineering Contradiction:

Improveresistance to humidityVSAvoidinternal pressure of smoothing condenser

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The gas exhaustion function is extracted from the general sealing structure and implemented through dedicated gas exhaustion holes in the container portion. This allows the smoothing condensers to be protected from humidity by the resin-sealed environment while providing a specific pathway for gas extraction to prevent pressure buildup.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The container portion incorporates gas exhaustion holes that create a controlled porous pathway for gas escape. This allows the structure to maintain its sealed, humidity-resistant properties while providing selective permeability for gas molecules to escape, preventing pressure accumulation.

Inventive Principle:

Principle #31Porous materials

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 improves the reliability of the controlling device to humidity and vibration by preventing resin intrusion into the smoothing condensers, thus extending their lifespan and maintaining performance in challenging environmental conditions.

Implementation Method 1

electrolysis materials inside thereof produce a gas while in use

Methodology Applied

Scientific EffectElectrolysis: Electrolysis

Data Source

PatentUS10170957B2Controlling device integrated rotating electric machine

Publication Date: 2019.01.01 MITSUBISHI ELECTRIC CORP

AI summary

A controlling device integrated rotating electric machine including a rotating electric machine's main body having a rotor winding and a stator winding, a power converter circuit connected to the rotor winding and the stator winding and having a control board and a power module and a smoothing condenser, a heat sink having a container portion swelling out towards a front side and attached to a rear side of the rotating electric machine's main body, a case, containing the control board and the power module, formed of a power supply wiring and a grounding wiring connected to a battery placed outside, and fixed to a rear side of the heat sink, and a sealing resin body sealing the control board and the power module contained in the case, wherein the smoothing condenser is joined with the power supply wiring and the grounding wiring, and is contained in the container portion.