scholarly journals Design and Experimental Evaluation of a Low-Cost Test Rig for Flywheel Energy Storage Burst Containment Investigation

2018 ◽  
Vol 8 (12) ◽  
pp. 2622 ◽  
Author(s):  
Armin Buchroithner ◽  
Peter Haidl ◽  
Christof Birgel ◽  
Thomas Zarl ◽  
Hannes Wegleiter
Keyword(s):  
Energy Storage ◽  
High Speed ◽  
Low Cost ◽  
Ambient Pressure ◽  
Failure Mechanisms ◽  
Test Methods ◽  
Flywheel Energy Storage ◽  
Test Rig ◽  
Strategic Development ◽  
Development Tool

Data related to the performance of burst containments for high-speed rotating machines, such as flywheel energy storage systems (FESS), turbines or electric motors is scarce. However, development of optimized burst containment structures requires statistically significant data, which calls out for low-cost test methods as a strategic development tool. Consequently, a low-cost test rig (so called spin pit) for the investigation of burst containments was designed, with the goal to systematically investigate the performance of different containment structures and materials, in conjunction with the failure mechanisms of different rotors. The gathered data (e.g., burst speed, acceleration, temperature, ambient pressure, etc.) in combination with a post-mortem analysis was used to draw an energy balance and enabled the assessment of the effectiveness of various burst containments.

Lubricant Free Foil Bearings Pave Way to Highly Efficient and Reliable Flywheel Energy Storage System

2016 ◽  
Author(s):  
Hooshang Heshmat ◽  
James F. Walton
Keyword(s):  
Energy Storage ◽  
High Speed ◽  
Ambient Pressure ◽  
Storage System ◽  
High Surface ◽  
Mean Free Path ◽  
Energy Storage System ◽  
Flywheel Energy Storage ◽  
Flywheel Energy Storage System ◽  
Foil Bearings

Advanced compliant foil bearings capable of operating in low ambient pressures associated with soft vacuum are now paving the way to a new type of flywheel energy storage system. Many conventional flywheel energy storage system design approaches use active magnetic bearings with backup bearing technologies to meet the need for high speed operation in a low ambient pressure environment. Low ambient pressures are needed to overcome the power loss limitations associated with windage at high surface speeds. However, bearing technologies that rely on active control tend to be large, are dynamically soft which necessitates backup bearings and require a power supply which consumes some of the stored power to maintain rotor levitation. In this paper the authors will demonstrate both theoretically and experimentally the ability of advanced 5th generation compliant foil bearings to support large flywheel rotors weighing in excess of 900 N and which can operate to speeds in excess of 40,000 rpm. Testing conducted at pressures as low as 7 kPa demonstrates the ability of foil bearings to operate in low ambient pressures consistent with flywheel energy storage system needs for low windage loss. The authors will also present a hypothesis and the mechanisms involved in a hydrodynamic phenomenon that allows a foil bearing to operate successfully when the mean free path of the air molecules is exceedingly large due to low ambient pressures.

Strength Analysis of Energy Storage Flywheel Wrapped with Composite Material

2013 ◽  
Vol 577-578 ◽  
pp. 105-108
Author(s):  
Hong Li ◽  
Yi Meng Pang ◽  
Fang Fang Xu ◽  
Li Li
Keyword(s):  
Composite Material ◽  
Energy Storage ◽  
Power Systems ◽  
High Speed ◽  
Strength Analysis ◽  
Flywheel Energy Storage ◽  
Element Analysis ◽  
Rotating Speed ◽  
Energy Storage Efficiency ◽  
Design And Manufacture

The technology of flywheel energy storage is already widely used in motorcar, electric power systems, spaceflight and martial fields. Decreasing the weight, increasing rotating speed and strength of the flywheel rotor and improving the energy storage efficiency of the flywheel are always attention-getting. In this paper, the flywheel energy storage wrapped with composite material by interference fit to hub is designed and finite element analysis is done to obtain the stress distribution of it before being produced. The maximum and variety of stress are studied and the influence of composite material wrapped on flywheel rotating at a high speed is discussed. Then the action of composite material preload to the flywheel is thought about. The results of this analysis can prepare a valuable guide for flywheel energy storage at design and manufacture stage.

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