ESP Motor Stator Lamination Axial Locking Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing submersible pump stators in downhole pumping systems face challenges in maintaining axial stability and preventing rotation, which can lead to inefficiencies and potential damage due to the residual forces from snap rings and lamination stacks.
Innovation Solution
The implementation of a locking coupling mechanism using a ring with tabs and a strip inserted into a longitudinally extending groove, combined with lock ring assemblies anchored within the housing, to securely lock the stator laminations in place and prevent axial rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If snap rings are used to compress and lock the lamination stack, then the laminations are secured in place, but the residual forces from the snap rings and lamination stacks can cause axial instability and rotation
Solution Approach 1:
The patent extracts the harmful residual forces by introducing a groove structure that allows the lamination stack to expand axially without generating rotational forces. The groove provides a controlled path for expansion, separating the stabilizing function from the harmful residual forces.
Solution Approach 2:
The groove acts as an intermediary element between the lamination stack and the housing. It mediates the expansion forces by providing a defined path, preventing these forces from causing rotation while still allowing the snap rings to secure the laminations.
2Reliability
If the lamination stack is compressed to lock it in place, then the laminations are secured, but the housing may be stretched and the locking mechanism may be insufficient
Solution Approach 1:
The patent segments the housing into regions with and without grooves. The grooved regions accommodate expansion and reduce stress concentration, while non-grooved regions maintain structural integrity. This segmentation allows the housing to withstand compression without excessive stretching.
Solution Approach 2:
The groove structure provides beforehand cushioning by accommodating the expansion of the lamination stack before it can cause harmful effects. The groove acts as a buffer that absorbs expansion forces, preventing them from stretching the housing excessively.
3Reliability
If a simple snap ring mechanism is used, then the device complexity is low, but the prevention of lamination spin is insufficient
Solution Approach 1:
The patent adds a dimensional element by introducing grooves that extend axially through the housing. This transforms the locking mechanism from a purely radial snap ring system to a combined radial-axial system, providing enhanced prevention of lamination spin without significantly increasing complexity.
Data Source
AI summary
A submersible pumping system for use downhole, wherein the system includes a pump and a pump motor for driving the pump. The pump motor includes a housing with corresponding stator and rotor lamination stacks disposed within the housing. Also included with the pump motor is an anchoring system for axially securing the stator lamination stack within the motor housing.