Canned Motor Support Ring Structure for Coolant-Tight Sealing
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Solution Overview
Problem
Canned electric motors face challenges in achieving reliable coolant leak-tightness and economical production while minimizing weight, with existing designs often struggling to effectively compensate for thermal and mechanical expansions during operation.
Innovation Solution
The design incorporates a support section with an exposed end section and a seal section that decouples the rotor space from the stator space, utilizing a support ring and can element to provide axial support and ensure coolant-tight sealing, with the support ring being made from fiber composite material to match thermal expansion coefficients and prevent detachment during temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a support ring is made from fiber composite material to match thermal expansion coefficients, then thermal expansion-related issues are prevented and reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The support ring is made from fiber composite material specifically selected to match the thermal expansion coefficient of the laminated core. This parameter matching prevents relative movement and detachment between components during thermal cycles, ensuring reliable coolant-tight sealing without requiring additional compensating mechanisms
Solution Approach 2:
A fiber composite material is used for the support ring to achieve tailored thermal expansion properties that match the laminated core. The composite structure allows precise control of thermal expansion characteristics while maintaining mechanical strength, resolving the contradiction between reliability and manufacturing complexity
2Weight of moving object
If the support section is exposed at its axial end, then weight is reduced and heat dissipation is improved, but mechanical strength and stability may be compromised
Solution Approach 1:
The end section of the support section is exposed by removing material from its axial end, eliminating unnecessary weight while maintaining the structural integrity required for support functionality. This extraction of excess material achieves weight reduction without compromising essential strength
Solution Approach 2:
The support section has different structural characteristics at different locations: the seal section maintains full thickness for sealing reliability, while the exposed end section has reduced material for weight reduction. This local differentiation optimizes both weight and strength where needed
3Reliability
If the support section decouples rotor space from stator space, then coolant-tight sealing is improved, but device complexity increases
Solution Approach 1:
The support section integrates multiple functions: it provides mechanical support for the rotor, creates the seal section for coolant-tight separation between rotor and stator spaces, and offers thermal expansion compensation. By merging these functions into a single component, the design achieves reliable sealing without proportionally increasing device complexity
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 configuration ensures reliable coolant-tight sealing, decouples thermal and mechanical stresses, and allows for straightforward and economical manufacturing, while maintaining low weight and preventing thermal expansion-related issues.
Implementation Method 1
the support ring being made from fiber composite material to match thermal expansion coefficients and prevent detachment during temperature changes
Data Source
AI summary
A canned motor includes a stator with a laminated core and a winding with winding heads, and including a rotor, which is mounted so as to be rotatable relative to the stator, and a can element, which is arranged between the stator and the rotor, and a support ring, which is coupled to the can element. The support ring on its own and/or together with the can element provides a support section which extends at least partially axially adjacent to the laminated core. The support section lies with a seal section against a seal device such that a rotor space is sealed off in coolant-tight fashion with respect to a stator space.