Electrostatic Motor Bearing Assembly for Safe Plate Separation
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Solution Overview
Problem
Existing electrostatic machines face challenges with low power density, complexity in managing capacitive interfaces, and the risk of arcing due to high electric fields, which can lead to reduced performance and potential damage from plate deflection and gas generation in dielectric fluids.
Innovation Solution
The design incorporates a rotor and stator plate configuration with a separation assembly, including bearings and magnetic elements, to maintain a minimum separation distance and prevent plate contact, while optimizing electrode placement and fluid management to enhance torque and power density, and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the separation distance between rotor plate and stator plate is reduced to increase power density, then power density is improved, but the risk of plate contact and arcing increases
Solution Approach 1:
A coupled bearing assembly is introduced as an intermediary mechanical element between the rotor plate and stator plate. The bearing includes a bearing member coupled to one plate and a race aligned with it on the other plate, creating a physical intermediary that maintains separation while allowing controlled interaction. This mediator prevents direct plate contact while enabling the plates to operate at minimal safe distances, thus increasing power density without sacrificing reliability.
2Power
If coupled bearings are positioned radially outward to maximize electrode area, then power density is improved, but the structural support and plate alignment become more difficult to maintain
Solution Approach 1:
The coupled bearing assembly is designed to perform multiple functions simultaneously: it provides mechanical support for the plates, maintains precise radial alignment, prevents plate contact, and allows radial positioning at optimal locations for maximizing electrode area. By consolidating these functions into a single integrated component, the design achieves high power density without proportionally increasing device complexity.
3Power
If the minimum separation distance is reduced to enhance torque density, then torque density is improved, but the mechanical integrity and stability of the dielectric environment are compromised
Solution Approach 1:
The coupled bearing assembly acts as a preventive cushioning mechanism that maintains a minimum safe separation distance between the rotor plate and stator plate. By providing this mechanical cushioning in advance, the system prevents conditions that would lead to plate contact, arcing, and disruption of the dielectric environment. This allows the plates to be positioned as close as possible without compromising the stability of the dielectric medium, thereby maximizing torque density while maintaining mechanical integrity.
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 configuration improves power and torque density, reduces capital and operating costs, and enhances the mechanical integrity of the electrostatic machine by preventing plate deflection and maintaining a stable dielectric environment, thus increasing reliability and performance consistency.
Implementation Method 1
The coupled bearing is sized to maintain a minimum separation distance between the rotor plate and the stator plate
Implementation Method 2
Electrostatic machines operate on capacitive principles rather than inductive principles
Implementation Method 3
Electrostatic machines operate on capacitive principles rather than inductive principles
Data Source
AI summary
An example apparatus including a rotor stage of an electrostatic machine, the rotor stage including a rotor plate, at least one rotor via, a rotor power distribution board including at least one rotor power distribution bus, at least one rotor power coupling perforation, and a rotor electrical coupling circuit; a stator stage of the electrostatic machine, the stator stage including a stator plate, at least one stator via, a stator power distribution board including at least one stator power distribution bus, at least one stator power coupling perforation; and a stator electrical coupling circuit structured to electrically couple the at least one stator power distribution bus to at least a portion of the plurality of stator electrodes, wherein the stator electrical coupling circuit extends through the at least one stator via and the at least one stator power coupling perforation.