Brush Holder Cover Layout for Insulation in Rotating Machines
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Solution Overview
Problem
Existing rotating electric machines face insulation property deterioration due to abrasion powder accumulation between the brush and the housing, which is not addressed by existing technologies.
Innovation Solution
The rotating electric machine incorporates a brush holder accommodating portion in the first cover, where the brush holder is positioned such that the distance between its lower surface and the inner peripheral wall is larger than other distances, creating a sufficient space for abrasion powder accumulation and maintaining insulation distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brush holder is positioned close to the inner peripheral wall of the brush holder accommodating portion, then the insulation distance is reduced, but the space for abrasion powder accumulation is insufficient
Solution Approach 1:
The brush holder is positioned asymmetrically within the accommodating portion, utilizing the axial dimension to create sufficient clearance. By making the distance from the lower surface to the inner peripheral wall larger than distances from other surfaces, the invention creates a dedicated space dimension for abrasion powder accumulation while maintaining adequate insulation distances in all directions.
Solution Approach 2:
The patent employs asymmetric positioning of the brush holder within the accommodating portion. The distance from the lower surface to the inner peripheral wall is intentionally made larger than distances from other surfaces, creating an asymmetric clearance distribution that provides both accumulation space and insulation protection.
Data Source
AI summary
A rotating electric machine has a brush holder that holds brushes. A first cover through which a rotor shaft passes is provided on one end side in an axial direction. A brush holder accommodating portion that accommodates the brush holder is recessed in the first cover in the axial direction from an outer side of the first cover. The brush holder is disposed in the brush holder accommodating portion such that a distance between a lower surface of the brush holder and an inner peripheral wall of the brush holder accommodating portion is larger than a distance between another portion of the brush holder and another inner peripheral wall of the brush holder accommodating portion.