Centered Stator Pump-Motor Assembly for Precise Axial Alignment
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Solution Overview
Problem
Existing pump-motor units are difficult to assemble quickly and accurately on automated mounting machines due to the complexity of aligning and securing components like the stator relative to the rotor.
Innovation Solution
A pump-motor unit design featuring a housing structure with a centred stator, utilizing a stator centring structure and housing centring portion that allows for precise axial alignment and secure fitting, enabling easy assembly by minimizing tilting and requiring minimal force for insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional pump-motor unit assembly methods are used, then components can be assembled, but the assembly process is time-consuming and prone to misalignment
Solution Approach 1:
The stator is pre-centered in the housing using a centring structure before final assembly. This preliminary positioning ensures that when the stator is inserted into the housing, it is already correctly aligned with the rotor, eliminating the need for time-consuming alignment adjustments during assembly and ensuring precise component positioning from the start
Solution Approach 2:
A centring structure acts as an intermediary element between the stator and the housing. This intermediate component facilitates easy and accurate assembly by providing a guiding mechanism that automatically centers the stator relative to the rotor during the insertion process, reducing both assembly time and alignment errors
2Reliability
If additional fastening means are used to secure components, then component positioning is more secure, but assembly complexity increases
Solution Approach 1:
The centring structure is designed to automatically secure the stator in the correct position within the housing without requiring additional fastening means. The geometric design of the centring structure creates a self-locking effect that maintains reliable component positioning through the assembly's normal operation, eliminating the need for extra fasteners and reducing assembly complexity
Data Source
AI summary
A pump-motor unit includes: a housing structure; an impeller for delivering a fluid; an electric drive motor accommodated in the motor space and including a rotor coupled to the impeller in order to rotationally drive it and a stator with a stator centring structure. The housing structure includes a pump space portion, a motor space portion, a housing centring portion axially between the pump space portion and the motor space portion, and a motor space opening on an end-facing side, through which the rotor and the stator can be axially inserted into the motor space. The housing centring portion encloses the stator centring structure in order to centre the stator.