Motor Jacket Stator Assembly via Elastic Adhesive
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Solution Overview
Problem
The shrink fit method for incorporating a stator into a motor jacket applies strong pressing stress, which can distort the stator's shape and affect motor quality.
Innovation Solution
A method involving the insertion of a stator into a jacket with a hole having varying diameters, followed by introducing an elastic adhesive between the stator and jacket surfaces, and then cooling the jacket to align the axes and reduce stress through radial pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If shrink fit method is used to incorporate stator into jacket, then stator can be firmly fixed in jacket, but strong pressing stress is applied to stator causing shape distortion
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the stator and the jacket. This resin layer absorbs and distributes the pressing stress from the jacket, preventing direct transmission of stress to the stator. The resin acts as a buffer that maintains both the fixing strength and the shape integrity of the stator simultaneously.
2Ease of manufacture
If jacket is thermally expanded to enlarge hole diameter for stator insertion, then stator can be easily inserted, but strong pressing stress is generated during cooling shrinkage
Solution Approach 1:
The resin layer serves as a stress-absorbing intermediary that decouples the thermal expansion-shrinkage mechanism from direct stress transmission to the stator. The resin's viscoelastic properties allow it to accommodate the jacket's dimensional changes while maintaining constant stress levels on the stator.
Solution Approach 2:
The resin's physical and mechanical parameters (viscosity, elasticity, curing characteristics) are carefully selected and controlled to optimize its stress-absorbing capability. By adjusting resin formulation and curing conditions, the material can accommodate thermal dimensional changes while maintaining appropriate stress levels.
3Strength
If stator is pressed strongly against hole surface during shrink fit, then stator is firmly incorporated in jacket, but axis alignment between stator and jacket becomes difficult
Solution Approach 1:
The resin layer provides a compliant interface that allows for self-alignment during the incorporation process. As the resin is injected and distributes itself between the stator and jacket, it naturally fills gaps and accommodates minor misalignments, enabling the stator to settle into proper axial alignment while still achieving firm incorporation.
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 method ensures the stator's axis aligns with the jacket's axis while minimizing stress, preventing distortion and ensuring reliable bonding, thus improving motor quality.
Implementation Method 1
introducing an elastic adhesive into between an outer circumferential surface of the stator and a surface of the hole
Implementation Method 2
cooling the jacket for a given time after the introduction step
Data Source
AI summary
A method of manufacturing a motor jacket incorporating a stator includes: the step of inserting the stator into a hole in the jacket that has a diameter larger than the outer diameter of the stator; the step of introducing an elastic adhesive into a gap between a surface of the hole and the stator; and the step of cooling the jacket for a given time after introducing the adhesive into the gap.