Rotating electrical machine, manufacturing method therefor, compressor, blower, and refrigeration device equipped with rotating electrical machine

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Solution Overview

Problem

The concentration of stress on the elastically deformable member during winding of windings around the teeth in a stator iron core leads to potential breakage of the stator iron core due to axial reciprocating displacement, which is not effectively addressed by existing technologies.

Innovation Solution

The use of rigid insulators interposed between the teeth and windings, which overlap with the first and second core portions, reduces the axial displacement of the teeth during winding, thereby reducing stress concentration on the elastically deformable member and reinforcing the low-strength parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If windings are wound around the teeth of the stator iron core, then the electrical function is achieved, but stress concentrates on the elastically deformable member causing potential breakage

Engineering Contradiction:

Improvestator iron core integrityVSAvoidelastically deformable member strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

A rigid member is introduced as an intermediary component between the first core and the second core, positioned to overlap with the elastically deformable member. This rigid member serves as a mediator that bears the stress during winding operations, protecting the elastically deformable member from excessive stress concentration while maintaining the overall structural integrity of the stator iron core.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The stator iron core is constructed as a composite structure combining an elastically deformable member with a rigid member. The elastically deformable member provides vibration absorption functionality, while the rigid member provides structural support and stress resistance during winding operations. This composite structure allows both components to work together, with each addressing different aspects of the technical requirements.

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If the elastically deformable member is used to absorb vibrations, then vibration isolation is improved, but the member becomes a low-strength part susceptible to breakage

Engineering Contradiction:

Improvevibration isolationVSAvoidelastically deformable member strength

Core Design Contradiction:

Stability of the object's compositionVSStrength

Solution Approach 1:

The rigid member acts as a protective intermediary that shares the mechanical load during winding operations. While the elastically deformable member continues to perform its vibration absorption function, the rigid member intervenes to prevent excessive stress from concentrating on the weaker elastically deformable member, thereby protecting it from breakage while maintaining its vibration isolation capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Different regions of the stator iron core are given different mechanical properties: the elastically deformable member provides local flexibility and vibration absorption, while the rigid member provides local structural support and stress resistance. This local differentiation of material properties allows each component to optimize its specific function without compromising the other.

Inventive Principle:

Principle #3Local quality

3Strength

If the rigid member is added to reinforce the structure, then stress concentration is reduced, but the device complexity increases

Engineering Contradiction:

Improveoverall structure strengthVSAvoidstator iron core structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The rigid member is integrated into the existing stator iron core structure, merging its reinforcing function with the overall assembly. Rather than adding a completely separate component, the rigid member is positioned to overlap with and work together with the elastically deformable member, creating a unified composite structure that reduces stress concentration without requiring additional complex assembly steps or separate support systems.

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 configuration minimizes the risk of stator iron core breakage during winding by distributing stress evenly and reducing axial displacement, while also providing insulation, thus enhancing the structural integrity and reducing material costs.

Implementation Method 1

an elastically deformable member (753) is provided between the first core (751) and the second core (752) to absorb vibrations

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

the rigid member overlaps with the first core portion (751) and the second core portion (752) as viewed in the axial direction. As a result, the elastically deformable member (753) forming the low-strength part is covered with the rigid member so as to be reinforced

Methodology Applied

Scientific EffectMechanical support: Mechanical Force

Data Source

PatentEP4478585B1Rotating electrical machine, manufacturing method therefor, compressor, blower, and refrigeration device equipped with rotating electrical machine

Publication Date: 2026.04.01 DAIKIN INDUSTRIES LTD

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AI summary

A rotating electrical machine (30) is provided with a mechanism (72) configured to reduce an axial displacement of its tooth (77) during winding of a winding (73) around the tooth (77).