Motor Rotor Bearing Temperature-Activated Stabilizers
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Solution Overview
Problem
Current electric motor systems, particularly submersible motors, face issues with relative vibrational movement between bearing assemblies and the stator, leading to detrimental vibrations that affect long-term reliability due to imbalance and unstable shaft orbits.
Innovation Solution
A temperature-activated stabilizer assembly with an extensible member, made from materials like PEEK plastic, which expands at elevated temperatures to contact the stator, restricting relative motion and stabilizing the bearing assembly within the stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bearing assemblies are placed with clearance fit within the stator, then the rotor assembly can slide into the stator easily, but relative vibrational movement between the bearing assembly and stator occurs
Solution Approach 1:
The stabilizer assembly transitions from a non-contact to contact state dynamically based on shaft orbit conditions. During normal operation with stable shaft orbits, the stabilizer remains retracted allowing clearance fit operation. When vibration or unstable shaft orbits occur, the stabilizer automatically extends to contact the stator, providing dynamic stabilization without interfering with normal operation.
Solution Approach 2:
The stabilizer assembly changes its physical state and position based on operating conditions. The stabilizer extends from a retracted position during normal operation to a contact position when vibration is detected, changing the parameter of contact force and position to address vibration issues while maintaining ease of installation during normal conditions.
2Stability of the object's composition
If the bearing assembly is secured firmly to prevent rotation, then rotational stability is improved, but the ability to accommodate thermal expansion and maintain clearance fit is reduced
Solution Approach 1:
The bearing assembly is segmented into a stationary collar portion that provides rotational stability and a movable stabilizer assembly that can extend and retract. This segmentation allows the collar to remain firmly secured for anti-rotation while the stabilizer can independently move to accommodate thermal expansion and maintain proper clearance fit during operation.
Solution Approach 2:
The stabilizer assembly provides dynamic adjustment capability that allows the bearing assembly to adapt to thermal changes. While the collar remains firmly secured for rotational stability, the stabilizer can move dynamically to maintain proper clearance and accommodate thermal expansion, combining firm securing with thermal adaptability.
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 solution effectively reduces vibrations and stabilizes the shaft orbit by preloading a lateral force on the shaft, enhancing the long-term reliability of submersible motor systems.
Implementation Method 1
Under a first temperature the extensible member has a first volume and under a second temperature the extensible member expands to a second volume that is larger than the first volume
Data Source
AI summary
A bearing assembly for use in an electric motor has a temperature-activated stabilizer to reduce vibration. The electric motor has a stator assembly and a rotor assembly and the bearing assembly includes a collar that has an outer diameter that is less than an inner diameter of the stator assembly. The bearing assembly further includes a temperature-activated stabilizer assembly that includes an extensible member positioned within the stabilizer recess. Under a first temperature the extensible member has a first volume and under a second temperature the extensible member expands to a second volume that is larger than the first volume. As the extensible member expands, the extensible member comes into contact with the stator assembly.