Motor Brush Holder Diffusion Stopper Abrasion Powder
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Solution Overview
Problem
The existing motor designs suffer from insulation defects due to abrasion powder generated from the slidable contact between the power supply brushes and the commutator, which can form conductive lines and lead to short-circuits.
Innovation Solution
The motor incorporates a brush holder with tangential collecting recesses and diffusion stoppers to collect and restrict the diffusion of abrasion powder, preventing it from forming conductive paths between the brushes and the rotation shaft or armature core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power supply brushes are used in slidable contact with the commutator, then power can be supplied to the rotating armature, but abrasion powder is generated that can cause insulation defects
Solution Approach 1:
The patent extracts the harmful abrasion powder from the general motor environment by providing a dedicated collection path through the brush holder structure. The brush holder includes a collection chamber that receives abrasion powder from the brush-commutator interface, separating it from the armature core and stator winding areas where it would cause insulation defects.
Solution Approach 2:
The brush holder structure acts as an intermediary element between the brush-commutator interface and the motor interior. It includes a collection chamber that intercepts abrasion powder before it can reach critical components, and may include ejection holes that actively remove the powder from the system, preventing insulation defects.
2Device complexity
If a simple brush holder structure is used, then device complexity is reduced, but abrasion powder diffusion cannot be limited
Solution Approach 1:
The brush holder is designed to perform multiple functions: holding the power supply brushes in position, collecting abrasion powder from the brush-commutator interface, and ejecting the collected powder through ejection holes. This multi-functional design limits abrasion powder diffusion without requiring separate dedicated components for each function.
Solution Approach 2:
The brush holder may include a dust cover that forms a enclosed or semi-enclosed collection chamber. This thin-walled structure contains abrasion powder within a limited space while allowing for compact integration into the motor assembly, preventing powder diffusion to surrounding components.
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 effectively limits insulation defects by efficiently collecting and containing abrasion powder, reducing the risk of short-circuits and maintaining motor insulation integrity.
Implementation Method 1
a diffusion stopper arranged in a portion of the opposing portion located toward an outer side in a radial direction from the bearing holder. The diffusion stopper limits diffusion of abrasion powder from the power supply brushes
Data Source
AI summary
A motor includes a rotation shaft, a commutator, power supply brushes, and a brush holder. The brush holder includes an opposing portion that faces an end face of the commutator in an axial direction, a bearing holder, and a diffusion stopper. The diffusion stopper is arranged in a portion of the opposing portion located toward the outer side in the radial direction from the bearing holder and limits the diffusion of abrasion powder of the power supply brushes. The diffusion stopper is projected toward the commutator in the axial direction or recessed in the axial direction.