Electrostatic Motor Fluid Sealing for Stable Dielectric Gaps
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Solution Overview
Problem
Electrostatic machines face challenges with low power density, complexity in managing capacitive interfaces, and sensitivity of fluids to operating conditions, leading to harsh environments for components.
Innovation Solution
An electrostatic machine design incorporating a plurality of stator and rotor plates with a dielectric fluid and seals compatible with the operating temperature, using materials like fluorinated ethylene propylene and polytetrafluoroethylene, and additives such as free radical scavengers and water scavengers to enhance performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If dielectric fluid is used to increase permittivity in capacitive gap, then capacitive energy storage is improved, but fluid sensitivity to operating conditions and harsh environment for components worsens
Solution Approach 1:
The patent modifies the chemical composition parameters of the dielectric fluid by incorporating specific additives (free radical scavengers, water scavengers, contamination scavengers) to change the fluid's stability characteristics while maintaining its high permittivity property, thus resolving the contradiction between energy storage capability and operational stability
Solution Approach 2:
The dielectric fluid is formulated as a composite material combining base fluid with multiple functional additives, where each additive addresses specific degradation mechanisms, creating a synergistic composition that simultaneously achieves high energy storage and enhanced reliability under operating conditions
2Ease of operation
If seals are exposed to dielectric fluid environment, then fluid management is achieved, but seal material degradation due to chemical compatibility issues worsens
Solution Approach 1:
The patent applies different material properties to different components in contact with the dielectric fluid, selecting seal materials with specific chemical compatibility characteristics for each sealing location, thereby maintaining fluid management effectiveness while preventing material degradation through localized material optimization
3Power
If operating temperature increases, then power density improves, but seal material compatibility and fluid stability deteriorate
Solution Approach 1:
The patent selects seal materials and fluid compositions with specific thermal stability parameters that maintain chemical compatibility across the operating temperature range, allowing the system to operate at elevated temperatures for improved power density without sacrificing material integrity or fluid stability
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 design achieves higher power/torque density, greater reliability, and reduced capital and operating costs by maintaining a stable dielectric fluid environment and preventing plate contact, thus improving the overall performance and longevity of the electrostatic machine.
Implementation Method 1
a dielectric fluid disposed in the housing, and that fills a gap between the plurality of stator plates and the plurality of rotor plates
Implementation Method 2
the at least one seal includes a material compatible with the dielectric fluid
Implementation Method 3
The at least one additive includes a free radical scavenger
Implementation Method 4
The at least one additive includes a water scavenger
Implementation Method 5
Electrostatic machines operate on capacitive principles rather than inductive principles
Data Source
AI summary
An example electrostatic machine includes a number of stator plates, each having a stator electrode and rotationally fixed to a housing, a shaft at least partially defined within the housing and configured to rotate about an axis, and a number of rotor plates, each having a rotor electrode and rotational fixed to the shaft. The electrostatic machine includes a dielectric fluid disposed in the housing, and that fills a gap between the stator plates and the rotor plates. The electrostatic machine includes a seal associated with the shaft, where the seal includes a material compatible with the dielectric fluid.