Electric Machine Stator Mounting Bracket for Vibration Reduction

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Solution Overview

Problem

Rotary electric machines face substantial torsional reactive forces that can cause undesirable displacement, noise, and vibration due to inadequate securing of the motor stator, which existing technologies fail to effectively mitigate.

Innovation Solution

The design incorporates a substantially annular stator stack with laminations having peripherally outer protuberances forming apertures, allowing for the creation of a stator mounting boss and bracket mounting tabs that are angularly displaced, enabling secure fastening to a machine housing using threaded fasteners, with the bracket stacks providing flexibility to absorb reactive forces without deforming the stator back iron.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the stator is rigidly secured to prevent displacement, then mechanical stability is improved, but noise and vibration increase due to stress transfer to the stator

Engineering Contradiction:

Improvemechanical stabilityVSAvoidnoise and vibration

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The patent applies this principle by using a flexible bracket made of thin laminations (0.2mm to 0.4mm thickness) that can deform elastically under torsional loads. This flexible bracket interposed between the stator and housing absorbs reactive forces through elastic deformation, preventing stress transfer to the stator that would cause noise and vibration while maintaining mechanical stability.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent applies this principle by changing the physical state of the mounting structure from rigid to flexible. The bracket is designed with specific geometric parameters (lamination thickness, number of laminations between 3-20, overall thickness between 1.0mm to 4.0mm) that enable it to exhibit flexible behavior under load, allowing it to absorb torsional reactive forces without transferring stress to the stator.

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

If a flexible mounting structure is used to reduce stress on the stator, then noise and vibration are reduced, but mechanical stability deteriorates

Engineering Contradiction:

Improvenoise and vibrationVSAvoidmechanical stability

Core Design Contradiction:

Object-generated harmful factorsVSStability of the object's composition

Solution Approach 1:

The flexible bracket made of laminated steel sheets provides the necessary flexibility to reduce noise and vibration while maintaining adequate mechanical stability. The bracket's design with multiple thin laminations allows controlled elastic deformation under torsional loads, absorbing reactive forces without compromising the overall mechanical support of the stator.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent applies this principle by using a composite structure of multiple laminated sheets to form the flexible bracket. This composite construction provides both flexibility for absorbing torsional forces and sufficient structural integrity to maintain mechanical stability, achieving a balance between reducing noise/vibration and maintaining stable mounting.

Inventive Principle:

Principle #40Composite materials

3Strength

If the bracket stack includes many laminations to increase flexibility, then ability to absorb reactive forces is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveability to absorb reactive forcesVSAvoidmanufacturing complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent applies this principle by dividing the bracket into multiple separate lamination sheets (3 to 20 laminations) rather than using a single thick piece. This segmentation allows the bracket to be manufactured using standard punching and stacking processes, making it easier to produce while achieving the desired flexibility and force-absorbing capability through the cumulative effect of multiple thin layers.

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 configuration effectively secures the stator against torsional displacements, reducing noise and vibration by allowing flexible deformation of the bracket stacks while maintaining the structural integrity of the stator, thereby enhancing the mechanical coupling and reducing undesirable movements.

Implementation Method 1

allowing flexible deformation of the bracket stacks while maintaining the structural integrity of the stator

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS11482895B2Electric machine and method for manufacture

Publication Date: 2022.10.25 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

An electric machine may include a substantially annular stator stack having a plurality of laminations which include mounting ears. A fraction of the laminations may be oriented such that the mounting ears are angularly offset from the others. The stator may be secured to a housing at both mounting ear locations thus improving structural rigidity and enhancing performance.