Immersive Coolant Aging Simulation via Inductive Field Testing
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Solution Overview
Problem
Premature failure of immersive coolants used in electric motors due to electromagnetic field effects, which reduce viscosity over time, poses a challenge in maintaining efficient heat transfer and lubrication.
Innovation Solution
A test system that simulates the dynamic effects of electric motor operation on coolants by subjecting them to high-frequency switching electromagnetic fields, allowing for the evaluation of coolant characteristics and degradation over time, using a setup with programmable DC power, inductive current transfer, and temperature monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If immersive cooling is used to transfer heat away from the motor, then heat transfer efficiency is improved and motor size can be reduced, but the coolant experiences premature failure due to reduced viscosity from electromagnetic field effects
Solution Approach 1:
The patent applies preliminary action by pre-mixing viscosity index improvers into the dielectric coolant before the coolant is deployed in the motor system. This preventive measure ensures that the coolant maintains adequate viscosity levels even after prolonged exposure to electromagnetic fields, thereby extending coolant lifespan while preserving heat transfer efficiency throughout the operational period
2Speed
If the coolant viscosity is reduced by electromagnetic field effects, then the coolant can be pumped more easily, but the lubrication performance deteriorates leading to premature bearing failure
Solution Approach 1:
The patent applies parameter changes by incorporating viscosity index improvers that dynamically adjust the coolant's viscosity characteristics. These additives modify the viscosity-temperature relationship and provide viscosity stabilization under electromagnetic field exposure, ensuring that the coolant maintains sufficient viscosity for effective lubrication while still allowing for adequate flow rates through the motor system
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
Enables the assessment of coolant performance and aging under simulated motor conditions, providing insights into thermal and physical changes, thereby extending the life of both the coolant and motor components.
Implementation Method 1
A test system for testing immersive coolants in electric motors includes a DC power source, a first coil and a second coil that are immersed in the coolant. The DC power source is connected to the first coil and the first coil is inductively coupled to the second coil.
Implementation Method 2
The DC power source is connected to the first coil and the first coil is inductively coupled to the second coil.
Data Source
AI summary
A system for simulating the effects of use and aging on immersive coolants. Two conductive coils are immersed in a tank containing a sample of the coolant. The coils are spaced such that electrical activation of the first coil induces current in the second coil. A DC power source is provided to an inverter, which provides AC current for activating the first coil. The induced AC current in the second coil is delivered to a rectifier which converts the induced AC current to DC current. The DC current is then returned to the power source. The electromagnetic field between the coils simulates motor operation, so that the coolant's physical and chemical characteristics can be tested for the effects of use and aging.