Axially Displaceable Rotor Control via Lubrication Oil Pressure
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Solution Overview
Problem
Dynamoelectric machines of the permanent magnet type face challenges in adjusting rotor-stator magnetic flux interaction effectively, particularly at high rotational velocities, where existing systems struggle to optimize torque and back electromagnetic force (EMF) generation.
Innovation Solution
A control system that regulates lubrication oil pressure through a hydraulic pump and solenoid-operated flow control valve to adjust axial displacement of rotor components, allowing for dynamic control of rotor-stator magnetic flux interaction by varying lubrication oil flow and pressure, thereby optimizing torque and EMF at different rotational velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If rotor magnets are axially displaced from the stator to reduce back EMF generation at high rotational velocities, then high-velocity motor torque is improved, but the mechanism for controlling rotor displacement adds device complexity
Solution Approach 1:
The lubrication oil pressure control system serves multiple functions: it not only provides necessary lubrication for bearing operation but also simultaneously controls the axial displacement of rotor magnets. This multi-functionality eliminates the need for a separate control system, thereby improving motor torque through rotor-stator flux interaction control without adding device complexity.
Solution Approach 2:
The system uses the machine's own lubrication oil pressure to control rotor magnet displacement, rather than requiring an external or separate control mechanism. The lubrication system serves itself by providing dual functionality: both lubrication and actuation of rotor position, thus achieving torque optimization without increasing overall system complexity.
2Power
If lubrication oil pressure is increased to control rotor magnet displacement, then rotor-stator magnetic flux interaction is optimized, but energy consumption increases
Solution Approach 1:
The system utilizes the existing lubrication oil pressure that would be generated during normal machine operation to control rotor magnet displacement. By doing so, it converts a necessary operational requirement (lubrication) into a useful control mechanism, optimizing magnetic flux interaction without requiring additional energy input or separate actuation systems.
Solution Approach 2:
The lubrication oil pressure control system performs dual functions: providing essential lubrication for bearing operation and simultaneously controlling rotor magnet axial displacement to optimize magnetic flux interaction. This multi-functionality allows the system to achieve optimized power output without the energy consumption penalty of dedicated control systems.
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 system effectively maintains high torque at low rotational velocities and reduces back EMF at high rotational velocities, enabling efficient power transmission by dynamically adjusting rotor-stator magnetic flux interaction.
Implementation Method 1
a hydraulic pump for generating a flow of lubrication oil; and means for regulating the flow of lubrication oil to the machine to develop a corresponding lubrication oil pressure that controls axial displacement
Implementation Method 2
solenoid-operated flow control valve to adjust axial displacement of rotor components, allowing for dynamic control of rotor-stator magnetic flux interaction
Implementation Method 3
rotor magnets that are axially displaceable from a corresponding stator assembly to vary rotor-stator magnetic flux interaction
Implementation Method 4
reduce back electromagnetic force (emf) generation in motor operation at high rotational velocities
Data Source
AI summary
A dynamoelectric machine that has at least one rotor component proximate a stator that is axially displaceable from the stator in response to pressure of lubrication oil delivered to its lubrication system has a system for changing axial displacement of each axially displaceable rotor component from the stator to cause a corresponding change in rotor-stator magnetic flux interaction, comprising: a hydraulic pump for generating a flow of lubrication oil; and means for regulating the flow of lubrication oil to the machine to develop a corresponding lubrication oil pressure that controls axial displacement of each axially displaceable rotor component.