Stator Tooth Shoulder Arc Chamfering for AC Traction Motor Noise

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Solution Overview

Problem

AC traction motors produce excessive electromagnetic noise during operation, limiting their application in certain fields and requiring further noise reduction methods beyond existing solutions.

Innovation Solution

A denoising optimization method for AC traction motors involves chamfering the stator tooth shoulder by determining optimal inscribed arc chamfering size and oblique height using finite-element analysis and a particle swarm optimization algorithm to reduce electromagnetic noise while improving efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If traditional stator tooth design is used, then manufacturing is simple, but electromagnetic noise is excessive

Engineering Contradiction:

Improveelectromagnetic noiseVSAvoidstator tooth structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies local quality by implementing chamfering with inscribed arc only at the stator tooth shoulder region rather than the entire stator structure. This localized modification reduces electromagnetic noise at the critical tooth shoulder area where noise is generated, while keeping the rest of the stator structure simple and unchanged.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses spheroidality by replacing the traditional sharp or linear chamfer at the stator tooth shoulder with an inscribed arc curvature. This curved transition reduces the abrupt geometric discontinuity that causes electromagnetic noise, smoothing the magnetic flux distribution at the tooth shoulder while maintaining structural integrity.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Object-affected harmful factors

If multiple existing noise reduction methods are applied, then some noise reduction effect is achieved, but noise reduction requirements are still not met and motor efficiency may deteriorate

Engineering Contradiction:

Improveelectromagnetic noiseVSAvoidmotor efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent applies parameter changes by optimizing specific geometric parameters of the chamfered stator tooth shoulder, including the inscribed arc radius, chamfer dimensions, and tooth shoulder angle. These parameter optimizations reduce electromagnetic noise while maintaining or improving motor efficiency, avoiding the efficiency deterioration that can occur with other noise reduction methods.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11799353B2Denoising optimization method for AC traction motor by chamfering stator tooth shoulder with inscribed arc

Publication Date: 2023.10.24 HUNAN UNIV OF SCI & TECH

AI summary

A denoising optimization method for an AC traction motor by chamfering a stator tooth shoulder includes taking an angular vertex of the stator tooth shoulder as an end point, obtaining two points equidistantly along two sides of a stator tooth shoulder angle from the end point; and using the two points as tangent points D1 and D2 of the inscribed arc; making the inscribed arc of the tooth shoulder angle through the two tangent points D1 and D2, cutting off the tooth shoulder angle along the inscribed arc, and adjusting an oblique height HS1 of a stator tooth pole shoe. The invention obtains optimal values of a chamfering size and oblique height of a stator tooth slot pole shoe by adjusting the oblique height of the stator tooth pole shoe and adopting a particle swarm optimization algorithm.