Elastic Rubber Pot for Precise Rotor Shaft Alignment
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Solution Overview
Problem
The alignment and positioning of the rotor shaft to the bearing block in electric motors is problematic due to limited installation space and tight tolerances, requiring a simple and cost-effective solution.
Innovation Solution
A positioning device made of elastic material, such as rubber, is used to precisely align and position the rotor shaft within the bearing block, incorporating features like a fixing device for the rotor shaft and a holding device for the Hall effect board, with a dust cap to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional rigid positioning structures are used for rotor shaft alignment, then positioning precision can be achieved, but device complexity and assembly cost increase
Solution Approach 1:
The patent changes the physical state of the positioning material from rigid to elastic. The elastic material can deform under compression to accommodate the rotor shaft, then maintains precise positioning through elastic recovery. This allows achieving alignment precision without complex rigid structures, as the elastic material adapts to dimensional variations through deformation rather than requiring precision-machined rigid components.
Solution Approach 2:
The patent employs elastic material (such as rubber or elastomer) as the positioning element, representing a composite material approach. This elastic material combines flexibility for accommodation with sufficient structural integrity for precise positioning, replacing traditional rigid metallic positioning structures and thereby reducing overall device complexity while maintaining positioning accuracy.
2Manufacturing precision
If tight tolerances are maintained for rotor shaft positioning, then alignment precision is achieved, but assembly difficulty and cost increase
Solution Approach 1:
The elastic material's ability to deform changes the tolerance requirements. Instead of requiring tight tolerances in rigid components, the elastic material accommodates dimensional variations through elastic deformation. This allows for looser manufacturing tolerances in associated components while still achieving precise final positioning, significantly easing manufacturing and assembly processes.
Solution Approach 2:
The elastic material acts as a cushioning element that anticipates and absorbs dimensional variations and misalignments before they affect the final positioning. By pre-compressing the elastic material during assembly, the system compensates for tolerance variations in advance, ensuring precise positioning without requiring extremely tight manufacturing tolerances.
3Manufacturing precision
If multiple separate components are used for positioning and fixing, then positioning precision can be maintained, but assembly effort increases
Solution Approach 1:
The patent merges multiple functions (positioning, fixing, and alignment) into a single integrated elastic positioning element. This elastic component simultaneously performs all three functions through its deformation characteristics, eliminating the need for multiple separate components and significantly reducing assembly steps while maintaining positioning accuracy.
Solution Approach 2:
The elastic positioning element is designed to perform multiple functions: it positions the rotor shaft axially, provides radial alignment, and acts as a fixing element. This multi-functional design replaces what would traditionally require several separate components, streamlining the assembly process and improving productivity without sacrificing positioning precision.
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
The solution ensures precise alignment and protection against contamination, maintaining tight tolerances while reducing assembly complexity and cost.
Implementation Method 1
The positioning device (7) is made of an elastic material and is essentially pot-shaped with an interior space (IR)
Implementation Method 2
Furthermore, a dust cap is included at one end of the positioning device. This easily prevents dust or other contaminants from entering the interior of the electric motor.
Data Source
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AI summary
The invention relates to a positioning device for an electric motor and bearing block, wherein the electric motor comprises a rotor, a rotor shaft and a stator. The positioning device is at least partially made of a resilient material and is substantially designed in the shape of a crucible with an interior and is positionable in a central recess of the bearing block for at least partially receiving a first end of the rotor shaft.