Magnetic Bearing Shielding in ESP Motors Against Field Interference
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Solution Overview
Problem
Intense magnetic fields generated by electric motor rotors and stators interfere with magnetic bearings in ESP assemblies, degrading their performance and reducing the operational life of the ESP assembly.
Innovation Solution
Magnetic shielding using high magnetic permeability materials is implemented proximate to the magnetic bearings to reroute the magnetic fields away from the bearings, thereby reducing interference and enhancing their performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic shielding is added to protect magnetic bearings from motor field interference, then bearing performance and ESP assembly reliability are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The magnetic shield is nested within the motor structure, positioned between the rotor/stator and the magnetic bearing. This nested configuration allows the shield to protect the bearing from motor field interference while being integrated into the existing motor assembly, minimizing additional space requirements and structural complexity
Solution Approach 2:
The magnetic shield acts as an intermediary component that blocks or redirects the motor's magnetic field, preventing it from directly interfering with the magnetic bearing. This intermediary structure resolves the contradiction by introducing a dedicated protective element that isolates the bearing from harmful electromagnetic effects
2Object-affected harmful factors
If magnetic shielding materials are placed proximate to magnetic bearings, then interference from motor magnetic fields is reduced, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The magnetic shield is implemented only in the specific region where magnetic field interference occurs - between the motor components and the magnetic bearing. This localized approach applies magnetic shielding materials or structures only where needed, rather than throughout the entire assembly, thereby reducing manufacturing complexity while still effectively addressing the harmful magnetic field interference
Solution Approach 2:
The magnetic shield may be divided into multiple segments or sections that can be separately manufactured and then assembled around the magnetic bearing. This segmentation allows for easier fabrication of individual shield components and simplifies the assembly process, as the shield can be installed in parts rather than requiring a single complex piece
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 magnetic shielding improves the performance and extends the operating life of the ESP assembly, reducing maintenance costs and production downtime while increasing hydrocarbon production.
Implementation Method 1
Magnetic shielding using high magnetic permeability materials is implemented proximate to the magnetic bearings to reroute the magnetic fields away from the bearings
Data Source
AI summary
An electric submersible pump (ESP) assembly. The ESP assembly comprises a centrifugal pump, an electric motor mechanically coupled by a drive shaft to the centrifugal pump, wherein the electric motor comprises a stator and a rotor, a bearing, wherein the bearing is disposed inside the electric motor, and a magnetic shield disposed in the electric motor between bearing and the rotor and stator.