Flywheel Energy Storage Vacuum Isolation Barrier
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Solution Overview
Problem
High-voltage flywheel energy storage systems face the risk of plasma formation and electric arc discharge due to ionization in partial vacuum environments, leading to potential equipment failure and power loss.
Innovation Solution
Incorporating an ionization avoidance barrier to isolate motor windings from the reduced interior pressure within the flywheel housing, and maintaining a deep vacuum in both the flywheel housing and motor/generator to prevent plasma formation and electric arc discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the flywheel housing operates in a partial vacuum environment, then windage losses are reduced and energy efficiency is improved, but plasma formation and electric arc discharge risk increases on motor windings
Solution Approach 1:
The motor/generator housing is segmented into a separate sealed enclosure that isolates the motor windings from the partial vacuum environment of the flywheel housing. This allows the flywheel chamber to maintain low pressure for reduced windage losses while the motor chamber maintains atmospheric pressure to prevent plasma formation on windings.
Solution Approach 2:
A sealed barrier or partition acts as an intermediary between the partial vacuum environment and the motor windings. This intermediate structure allows the system to benefit from the vacuum environment (reduced windage) while protecting the motor windings from direct exposure to conditions that cause plasma formation.
2Device complexity
If motor windings are exposed to partial vacuum, then system complexity is reduced, but reliability decreases due to electric arc discharge
Solution Approach 1:
The system is divided into separate sealed chambers - one for the flywheel operating in vacuum and another for the motor/generator operating at atmospheric pressure. This segmentation maintains operational reliability by preventing plasma formation while avoiding excessive complexity through a straightforward sealed partition design.
3Object-affected harmful factors
If atmospheric pressure is maintained in the flywheel housing, then plasma formation is prevented, but windage losses increase reducing energy efficiency
Solution Approach 1:
The housing is segmented into two separate pressure zones: the flywheel chamber operates in partial vacuum to minimize windage losses, while the motor/generator chamber operates at atmospheric pressure to prevent plasma formation. This dual-chamber design allows both conditions to coexist without compromising either energy efficiency or safety.
Solution Approach 2:
Different pressure conditions are applied to different parts of the system according to their specific requirements. The flywheel region maintains low pressure for aerodynamic efficiency, while the motor winding region maintains atmospheric pressure for electrical safety, optimizing local conditions for each component's performance.
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
Effectively prevents ionization, plasma formation, and electric arc discharge, ensuring reliable operation and extending the lifespan of high-voltage flywheel energy storage systems by maintaining the motor windings in a gas-free environment.
Implementation Method 1
A connected motor/generator accelerates the flywheel for storing inputted electrical energy
Implementation Method 2
decelerates the flywheel for retrieving this energy
Implementation Method 3
an ionization avoidance barrier that prevents plasma formation on the motor winding by isolating the motor winding from a reduced interior pressure of the flywheel housing
Implementation Method 4
the rotating flywheel and motor/generator rotor operate in at least a partial vacuum to reduce windage losses due to drag forces acting on the flywheel
Data Source
AI summary
A high-voltage flywheel energy storage system to prevent ionization, plasma formation, and electrical arc discharge and corresponding method are provided. The high-voltage flywheel energy storage system prevents ionization, plasma formation, and electrical arc discharge by isolating the motor windings and motor end windings from the partial vacuum environment existing in the flywheel housing.