Rotary Electric Machine Temperature Detection via Localized Resin

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Solution Overview

Problem

Existing rotary electric machines with temperature detection elements require complex and costly resin filling over the entire circumference of coil end portions to ensure accurate temperature measurement, which increases manufacturing costs.

Innovation Solution

A rotary electric machine design featuring concentric rotor and stator with first and second flow channels of different lengths, where a temperature detection element is placed in a high-temperature coil portion along one flow channel, allowing for reliable temperature detection with a simpler structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If resin is filled over the entire circumference of the coil end portion to ensure accurate temperature measurement, then temperature detection reliability is improved, but manufacturing cost increases

Engineering Contradiction:
Improvetemperature detection reliabilityVSAvoidmanufacturing cost
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies local quality by providing resin filling only in specific localized regions where temperature detection is critical, rather than filling the entire circumference. The temperature detection element is positioned in contact with the coil end portion at a specific location, and resin is applied only in that local area to ensure thermal contact and accurate measurement, thereby reducing material costs and manufacturing complexity while maintaining detection reliability.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent extracts the resin filling process from being a comprehensive circumferential operation and reduces it to only the necessary localized areas. By identifying and isolating the specific regions where temperature measurement is most critical, the invention removes unnecessary resin application from other areas, thus lowering manufacturing costs and simplifying the production process while preserving the essential function of accurate temperature detection.

Inventive Principle:
Principle #2Taking out (Extraction)

2Reliability

If resin filling is applied over the entire circumference of the coil end portion, then thermal contact is improved, but device complexity increases

Engineering Contradiction:
Improvethermal contact qualityVSAvoidstructure complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements local quality by concentrating resin filling only in the specific localized regions where the temperature detection element contacts the coil end portion. This localized approach ensures adequate thermal contact for accurate measurement without requiring complex circumferential filling structures, thereby reducing device complexity while maintaining necessary thermal contact quality.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent segments the resin filling operation from being a continuous circumferential process into discrete localized applications. By dividing the filling task into specific segments only where needed for temperature detection, the invention simplifies the overall structure and reduces manufacturing complexity while still achieving the required thermal contact performance in the critical measurement zones.

Inventive Principle:
Principle #1Segmentation

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 design enables reliable temperature detection of high-temperature coil portions with reduced manufacturing complexity and cost, while maintaining effective cooling efficiency through distinct flow channels.

Implementation Method 1

cooling water that cools the coil portions of the stator flows through the first flow channel and the second flow channel

Methodology Applied
Scientific EffectHeat transfer: Convection

Implementation Method 2

temperature detection element provided in a coil portion on a high temperature side among the coil portions positioned along the first flow channel and the coil portions positioned along the second flow channel

Methodology Applied
Scientific EffectTemperature detection: Thermocouple

Data Source

PatentUS10498199B2Rotary electric machine
Publication Date: 2019.12.03 MITSUBISHI ELECTRIC CORP
  • US10498199B2 patent drawing
  • US10498199B2 patent drawing

AI summary

A rotary electric machine of the present invention includes, inside a housing, a rotor and a stator that are concentric with each other. The stator has a plurality of coil portions in a circumferential direction. In the stator, a first flow channel and a second flow channel, through which cooling water flows, are provided along the plurality of coil portions, each of the channels having one end connected to a flow channel inlet and the other end connected to a flow channel outlet. The lengths of the first flow channel and the second flow channel are mutually different. A temperature detection element is provided in a coil portion on a high temperature side among the coil portions positioned along the first flow channel and the coil portions positioned along the second flow channel.