Motor End Bracket Cutout Width Reduction for Structural Strength

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Solution Overview

Problem

Conventional motors with noise suppression elements require a wider cutout portion in the end bracket, which reduces strength, necessitating increased thickness to maintain structural integrity.

Innovation Solution

A motor design with a reduced-width cutout portion and an accommodation recess for noise suppression elements, where the feed members' accommodation recesses are wider than the cutout portion, allowing for stronger end brackets without thickness increases.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If noise suppression elements are located between the cutout portion corresponding portions of feed members, then the noise suppression elements can be accommodated, but the width of the cutout portion is increased and the strength of the end bracket is reduced

Engineering Contradiction:

Improveaccommodation of noise suppression elementsVSAvoidstrength of end bracket

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The invention moves the noise suppression elements from the radial direction (between cutout portions) to the axial direction (in the accommodation recess), utilizing a different spatial dimension to resolve the conflict between accommodation and structural strength

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The end bracket is segmented into distinct functional zones: the accommodation recess for noise suppression elements, the connector portion for electrical connections, and the reinforced circumferential wall for structural strength, allowing each zone to optimize its specific function

Inventive Principle:

Principle #1Segmentation

2Strength

If the thickness of the end bracket is increased in parts near the cutout portion, then the strength is ensured, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvestrength of end bracketVSAvoidcomplexity of end bracket structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

Instead of uniformly increasing thickness, the invention applies local reinforcement only where structurally necessary (at the cutout portion), while maintaining standard thickness in other areas, thus ensuring strength without excessive complexity

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The accommodation recess is designed in advance to accommodate noise suppression elements, preventing the need for later structural modifications or thickness increases to fit these components

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9035509B2Motor

Publication Date: 2015.05.19 DENSO CORP

AI summary

A yoke of a motor has a bottom and an open end and accommodates an armature. An end bracket substantially closes the open end of the yoke. A connector portion, which bulges outward of the yoke, and a cutout portion are formed in the circumferential wall of the end bracket. A pair of feed members is provided to extend from the interior of the end bracket to the connector portion through the cutout portion. The end bracket has an accommodation recess for accommodating the noise suppression element at a position corresponding to the cutout portion. Each feed member has an accommodation recess corresponding portion, which corresponds to the accommodation recess, and a cutout portion corresponding portion, which corresponds to the cutout portion. The distance between the accommodation recess corresponding portions of the feed members is greater than the distance between the cutout portion corresponding portions.