Electrostatic Rotating Machine With Dielectric Fluid Gap
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Solution Overview
Problem
Macro-scale electrostatic rotating machines face manufacturing challenges due to the need for high voltages and tight tolerances between stator and rotor components, which require ultra-high vacuum containment and are difficult to manufacture efficiently.
Innovation Solution
The design incorporates thin electrodes on the outer walls of dielectric sleeves, reducing rotor weight and allowing for various manufacturing techniques, with optimized dimensions and separation ratios to enhance mechanical strength and electrical performance, while maintaining smooth surfaces for reduced drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage is applied to achieve useful torque in macro-scale electrostatic machines, then torque generation is improved, but arcing between stator and rotor components occurs requiring ultra high vacuum containment
Solution Approach 1:
A dielectric fluid fills the gap between stator and rotor components, serving as an intermediary medium that withstands high electric fields without breaking down. This prevents arcing while allowing high voltage operation for useful torque generation, eliminating the need for ultra high vacuum containment vessels.
Solution Approach 2:
The dielectric strength of the medium between electrodes is changed from vacuum to a high dielectric strength fluid, fundamentally altering the electrical breakdown characteristics and enabling high voltage operation without arcing.
2Power
If the gap between stator and rotor components is minimized to increase capacitance, then electrical performance is improved, but manufacturing precision requirements increase significantly
Solution Approach 1:
The dielectric fluid provides high dielectric strength that allows operation with larger gaps while maintaining electrical performance. This relaxes manufacturing precision requirements for gap tolerances while still achieving useful capacitance and torque.
3Power
If traditional electromagnetic rotating machines are used, then high power output is achieved, but weight from ferrous materials and rare earth magnets increases significantly
Solution Approach 1:
The electromagnetic system using ferrous materials and rare earth magnets is replaced with an electrostatic system using dielectric fluids and conductive electrodes, eliminating heavy materials while maintaining power output capability.
Solution Approach 2:
The system uses non-magnetic, lightweight dielectric materials and conductors instead of traditional electromagnetic components, creating a composite structure that achieves high power output with significantly reduced weight.
4Power
If peg-style construction with increased design flexibility is used, then capacitance variation with rotation is optimized, but device complexity increases
Solution Approach 1:
The system uses a continuous dielectric fluid medium instead of discrete pegs, simplifying the structure while maintaining optimized capacitance variation through controlled electrode geometry and spacing.
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
This design simplifies manufacturing, reduces rotor mass, and increases electrical performance by enhancing the tangential component of the electric field, achieving efficient torque generation with improved mechanical strength and reduced drag.
Implementation Method 1
provide an insulating support extending circumferentially about an axis... corresponding opposed surfaces maybe separated by substantially constant separation distance... filled with a dielectric fluid... which increases the dielectric constant in the gap between the rotor and stator
Implementation Method 2
Torque is generated in the reference patent by means of variable capacitance. As the shaft of the machine turns, the capacitance among the rotor and stator pegs varies. Applying voltage to specific pin sets will produce torque proportional to the derivative of the capacitance with respect to position.
Implementation Method 3
the physical gap between the stator and rotor may be one to three orders of magnitude larger than that for MEMS machines. This larger gap requires higher applied voltages typically in the thousands or even tens of thousands of volts for comparable shear stress (electric field strength) in the rotor/stator gap to attain useful amounts of torque.
Data Source
AI summary
An electrostatic rotating electrical machine employs axially extending electrically conductive electrodes on a rotor interacting with a corresponding set of axially extending electrodes on a stator, where the electrodes are supported at an outer surface of a dielectric sleeve which continues beneath the electrodes to provide a robust support and to minimize electrode weight.