Electrostatic Motor Plate Stack for Stable Gap and Arc Prevention
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Solution Overview
Problem
Existing electrostatic machines suffer from low power density, complexity in managing capacitive interfaces, and challenges in maintaining a stable gap between rotor and stator plates, leading to potential arcing and reduced performance.
Innovation Solution
The design incorporates a rotor plate and stator plate configuration with a coupled bearing located radially aligned, maintaining a minimum separation distance and using a high permittivity fluid to prevent arcing, while optimizing electrode arrangement and excitation methods to enhance torque and power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a mechanical bearing system is used to maintain separation between rotor and stator plates, then the gap stability is improved, but the device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical bearing systems with an electrostatic field-based separation maintenance mechanism. The stator and rotor plates utilize electrostatic forces to maintain the required gap separation without physical contact, thereby improving gap stability while reducing mechanical complexity. The electrostatic field acts as a non-contact support system that eliminates the need for complex mechanical bearing arrangements.
Solution Approach 2:
The patent introduces an electrostatic field as an intermediary between the rotor and stator plates to maintain separation. This electrostatic intermediary provides the necessary repulsive force to keep plates at the correct distance without requiring direct mechanical contact or complex bearing systems, thus simplifying the overall device structure while maintaining stable gap separation.
2Power
If the gap between rotor and stator plates is reduced to increase power density, then the power density is improved, but the risk of arcing increases
Solution Approach 1:
The patent changes the electrical parameters by utilizing high voltage electrostatic fields to maintain precise gap control. By adjusting the electrostatic field strength and distribution, the system can maintain smaller gaps for higher power density while the electrostatic forces prevent plate contact and arcing, thus improving power density without sacrificing reliability.
Solution Approach 2:
The patent replaces mechanical contact-based gap control with electrostatic field-based control. This substitution allows for precise gap maintenance at smaller distances, enabling higher power density while the electrostatic repulsion prevents arcing and electrical breakdown that would occur with traditional mechanical systems at such close tolerances.
3Speed
If traditional inductive principles are used, then the machine can operate at higher speeds, but low loss torque generation at zero or low speeds is reduced
Solution Approach 1:
The patent employs dynamic electrostatic field control that can adapt to different operating conditions. The electrostatic machine can generate torque at zero speed through direct electrostatic attraction and repulsion between charged plates, and can transition to higher speed operation by modulating the field frequency and amplitude, thus providing both low-speed torque capability and high-speed operation that traditional inductive machines cannot achieve simultaneously.
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 achieves higher power and torque density with improved reliability and reduced capital and operating costs by stabilizing the gap and managing capacitive interactions effectively.
Implementation Method 1
using a high permittivity fluid to prevent arcing
Implementation Method 2
a coupled bearing located radially aligned, maintaining a minimum separation distance
Implementation Method 3
Electrostatic machines operate on capacitive principles rather than inductive principles
Data Source
AI summary
An example electrostatic machine including a rotor stack comprising a plurality of a rotor plates each including a plurality of rotor electrodes positioned on each side of the rotor plate; and at least one rotor via comprising an electrical connection between the plurality of rotor electrodes on a first side of the rotor plate and the plurality of rotor electrodes on a second side of the rotor plate; and a stator stack comprising a plurality of stator plates, each including a plurality of stator electrodes positioned on each side of the stator plate; and at least one stator via comprising an electrical connection between the plurality of stator electrodes on a first side of the stator plate and the plurality of stator electrodes on a second side of the stator plate.