Stator Temperature Detection Clamp Positioning

Solution Overview

Problem

The existing stator design for rotary electric machines, which uses a metal heat transfer unit to cover temperature detection elements, faces issues with compression and thermal expansion, leading to reduced accuracy and potential damage to the temperature detection elements due to mechanical stress.

Innovation Solution

A stator design that incorporates a temperature detection unit with a protection member and a fixing member featuring a clamp portion that does not overlap the temperature detection element, along with an opposed portion to create an air gap, effectively suppressing mechanical effects of thermal expansion and contraction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a metal heat transfer unit covers the temperature detection element to improve heat transfer, then heat transfer efficiency is improved, but thermal expansion of the metal causes compression or gaps that affect detection accuracy

Engineering Contradiction:

Improveheat transfer efficiencyVSAvoidtemperature detection accuracy

Core Design Contradiction:

TemperatureVSMeasurement precision

Solution Approach 1:

The heat transfer unit is divided into multiple circumferential sections with radial gaps between them, allowing the structure to accommodate thermal expansion and contraction without creating continuous compressive or gap forces on the temperature detection element

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Resin layers are introduced as intermediary materials between the metal heat transfer unit and the temperature detection element, providing thermal conduction while isolating the detection element from mechanical stress caused by thermal expansion

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If a metal heat transfer unit covers the temperature detection element to improve heat transfer, then heat transfer efficiency is improved, but thermal contraction of metal causes compression damage to the temperature detection element

Engineering Contradiction:

Improveheat transfer efficiencyVSAvoidtemperature detection element reliability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The heat transfer unit is divided into multiple circumferential sections with radial gaps between them, allowing the structure to accommodate thermal expansion and contraction without creating continuous compressive or gap forces on the temperature detection element

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Resin layers are introduced as intermediary materials between the metal heat transfer unit and the temperature detection element, providing thermal conduction while isolating the detection element from mechanical stress caused by thermal expansion

Inventive Principle:

Principle #24Intermediary (Mediator)

3Temperature

If the temperature detection element is only covered by the heat transfer unit, then heat transfer is improved, but thermal expansion generates gaps causing the element to drop off

Engineering Contradiction:

Improveheat transfer efficiencyVSAvoidposition stability of temperature detection element

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The heat transfer unit is divided into multiple circumferential sections with radial gaps between them, allowing the structure to accommodate thermal expansion and contraction without creating continuous compressive or gap forces on the temperature detection element

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The resin layer and heat transfer unit are combined into a composite structure where the resin provides both thermal conduction and mechanical bonding, ensuring the temperature detection element remains securely positioned while maintaining heat transfer efficiency

Inventive Principle:

Principle #5Merging (Combining)

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 enhances the accuracy and reliability of temperature detection by minimizing mechanical stress and maintaining excellent heat conductivity between the stator windings and the temperature detector, preventing damage and ensuring precise temperature monitoring.

Implementation Method 1

thermal expansion and contraction of the fixing member on a temperature detection element can be suppressed

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

thermal expansion and contraction of the fixing member on a temperature detection element can be suppressed

Methodology Applied

Scientific EffectThermal contraction: Thermal Contraction

Implementation Method 3

a substantially cylindrical heat transfer unit made of metal and provided at the neutral terminal to cover a temperature detection element

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Data Source

PatentUS10971977B2Stator for rotary electric machine and rotary electric machine

Publication Date: 2021.04.06 ASTEMO LTD

AI summary

Provided is a stator for a rotary electric machine which can suppress the mechanical effects of thermal expansion and contraction of a fixing member for fixing a temperature detector, on a temperature detection element. The stator for a rotary electric machine includes a stator coil, a temperature detection unit including a temperature detection element, a protection member extending in a longitudinal direction to cover the temperature detection unit, and a fixing member serving as a positioning mechanism for the temperature detection unit with respect to a stator coil. The fixing member includes a clamp portion for fixing the protection member, and the clamp portion clamps the protection member at a position where the clamp portion does not overlap the temperature detection element in a longitudinal direction of the protection member.