Auxiliary Core Fixing Protrusions for Stator Iron Loss Measurement

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Solution Overview

Problem

Existing methods for measuring iron loss in motor stator cores during manufacturing processes face accuracy issues due to misalignment and vibration caused by gaps between the C-shaped auxiliary core and stator teeth, leading to inaccurate magnetic field intensity measurements and increased iron loss.

Innovation Solution

The structure includes fixing protrusions on the C-shaped auxiliary core that fit into slots between stator teeth, ensuring stable assembly and preventing rotation, allowing for precise contact and accurate iron loss measurement across manufacturing processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a C-shaped auxiliary core is used to measure iron loss in motor stator cores, then measurement capability is provided, but misalignment and vibration occur due to gaps between the auxiliary core and stator teeth

Engineering Contradiction:

Improveiron loss measurement accuracyVSAvoidassembly stability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent introduces an intermediary component (auxiliary core with fixing protrusions) that mediates between the measurement system and the stator core. The fixing protrusions act as intermediaries that physically connect to the stator teeth, ensuring stable positioning and eliminating gaps that cause vibration and measurement errors.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The auxiliary core is segmented with fixing protrusions that can be independently positioned and fitted into slots between stator teeth. This segmentation allows each protrusion to independently secure the auxiliary core to specific stator teeth, ensuring stable contact and preventing misalignment during measurement.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If the auxiliary core is inserted without fixing protrusions, then assembly is simple, but rotation and misalignment occur leading to measurement errors

Engineering Contradiction:

Improveassembly simplicityVSAvoidalignment precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The auxiliary core features asymmetric fixing protrusions that correspond to specific slots between stator teeth. This asymmetric design ensures that the auxiliary core can only be assembled in the correct orientation, preventing rotation and misalignment while maintaining assembly simplicity through a straightforward insertion process.

Inventive Principle:

Principle #4Asymmetry

3Adaptability or versatility

If gaps exist between the auxiliary core and stator teeth, then assembly tolerance is accommodated, but magnetic field intensity measurements become inaccurate

Engineering Contradiction:

Improveassembly toleranceVSAvoidmagnetic field intensity accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The fixing protrusions are designed in advance to fit into specific slots between stator teeth, establishing predetermined contact points. This preliminary positioning action ensures that when the auxiliary core is assembled, the gaps are eliminated at critical measurement interfaces, ensuring accurate magnetic field intensity measurements while still accommodating overall assembly tolerance.

Inventive Principle:

Principle #10Preliminary action

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 measurement accuracy and stability, enabling quantitative assessment of iron loss in each manufacturing step, thereby improving motor efficiency by reducing iron loss and ensuring precise assembly.

Implementation Method 1

Two excitation windings 52 are wound around certain portions of the C-shaped auxiliary core 50 in a longitudinal direction

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a B-coil 54 is wound around a portion positioned inside any one excitation winding 52 of the two excitation windings 52

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS9476952B2Structure of measuring iron loss of motor stator core

Publication Date: 2016.10.25 HYUNDAI MOTOR CO LTD

AI summary

A structure for measuring iron loss of a motor stator core is provided. The structure includes an auxiliary core whose both end surfaces in a longitudinal direction come in contact with inner end surfaces of two adjacent stator teeth among a plurality of stator teeth in a radial direction in order to measure iron loss of a stator core in which a plurality of slots and the plurality of stator teeth are alternately formed on an inner circumferential surface of a stator yoke in a circumferential direction. A pair of excitation windings is provided at portions of the auxiliary core in the longitudinal direction spaced-apart from each other. A B-coil that is a sensor coil is provided at the auxiliary core so as to be positioned inside any one excitation winding of the pair of excitation windings. Fixing protrusions protrude from the both end surfaces of the auxiliary core to extend in the longitudinal direction, and inserted into the slot between the two adjacent stator teeth to be fitted and fixed in the circumferential direction. Accordingly, it is possible to quantitatively and accurately measure iron loss of the motor stator core for each manufacturing process.