Claw Pole Motor Core Structure for Low Vibration and Noise

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Solution Overview

Problem

Claw pole type motors experience vibration and noise due to air gaps formed between core components, leading to magnetic flux distortion and unbalanced current flow, which affects motor performance and stability.

Innovation Solution

The motor design includes a surrounding member to direct magnetic flux through a single gap, balancing magnetic resistance and flux density, and adjusting coil diameters and windings to equalize resistance values and ensure uniform current flow, while also optimizing claw pole arrangement and manufacturing techniques to minimize fabrication errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple air gaps are formed between core components, then magnetic flux can pass through multiple paths, but magnetic resistance increases and magnetic flux distortion occurs leading to vibration and noise

Engineering Contradiction:

Improvemotor stabilityVSAvoidvibration and noise

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and eliminates the harmful air gaps between core components by introducing a filling member that occupies the gap spaces. This removes the source of magnetic resistance and flux distortion that causes vibration and noise, while preserving the modular assembly structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The filling member acts as an intermediary substance introduced into the air gaps between core components. It mediates the magnetic flux path by providing a continuous magnetic conductive path, eliminating the harmful effect of air gaps while maintaining the modular assembly structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If coil diameters and windings are adjusted to equalize resistance values, then current flow becomes uniform, but device complexity increases

Engineering Contradiction:

Improvecurrent flow uniformityVSAvoidcoil configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by adjusting coil diameters and winding counts to equalize resistance values across different phases. This ensures uniform current flow and balanced magnetic field generation, improving motor reliability while managing the increased design complexity through systematic parameter optimization.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If fabrication errors occur during assembly, then gaps are formed between core components, but manufacturing precision can be improved by tighter tolerances

Engineering Contradiction:

Improveassembly toleranceVSAvoidassembly difficulty

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The filling member serves as a beforehand cushioning element that compensates for fabrication errors and assembly tolerances. By pre-filling the gaps between core components, it cushions against the harmful effects of dimensional variations, allowing for easier manufacturing while maintaining magnetic circuit integrity.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 reduces vibration and noise by minimizing magnetic flux reduction and torque ripple, stabilizing motor rotation and improving efficiency by ensuring balanced current flow and reduced cogging torque.

Implementation Method 1

If a magnetic flux is generated by current flowing through the U-phase coil, the V-phase coil, or the W-phase coil

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

the motor rotates the rotor using an attractive force and a repulsive force generated between the claw poles and the permanent magnets

Methodology Applied

Scientific EffectMagnetic attraction and repulsion: Magnetism

Data Source

PatentUS10714989B2Claw pole type motor and home appliance including same

Publication Date: 2020.07.14 SAMSUNG ELECTRONICS CO LTD

AI summary

Disclosed is a home appliance including a claw pole type motor, the claw pole type motor include a first core including a first core main body disposed on a rotary shaft, a first elongation portion disposed in the center portion of the first core main body and extending in the axial line direction of the rotary shaft, and a plurality of first claw poles disposed in the edge portion of the first core main body and extending in the axial line direction of the rotary shaft and a second core including a second core main body disposed on the rotary shaft, and a plurality of second claw poles disposed in the edge portion of the second core main body and extending in the axial line direction of the rotary shaft and a third core including a third core main body disposed on the rotary shaft, a second elongation portion disposed in the center portion of the third core main body and extending in the axial line direction of the rotary shaft, and a plurality of third claw poles disposed in the edge portion of the third core main body and extending in the axial line direction of the rotary shaft, wherein the second core further comprises a surrounding member disposed in the center portion of the second core main body and surrounding the first elongation portion and the second elongation portion.