A Bearing System for an Energy Storage Flywheel

2000 ◽  
pp. 1667-1673
Author(s):  
T. A. Coombs ◽  
A. M. Campbell
Keyword(s):  
Energy Storage ◽  
Bearing System

Analysis and Testing of a Magnetic Bearing Energy Storage Flywheel With Gain-Scheduled, MIMO Control

2000 ◽  
Author(s):  
Lawrence A. Hawkins ◽  
Brian T. Murphy ◽  
John Kajs
Keyword(s):  
Energy Storage ◽  
Dynamic Test ◽  
Magnetic Bearing ◽  
System Stability ◽  
University Of Texas ◽  
Mimo Control ◽  
Cross Axis ◽  
Five Axis ◽  
Gain Scheduled ◽  
Bearing System

The design and initial testing of a five axis magnetic bearing system in an energy storage flywheel is presented. The flywheel is under development at the University of Texas Center for Electromechanics (UT-CEM) for application in a transit bus. The bearing system for the prototype features homopolar permanent magnet bias magnetic bearings. The system has been successfully tested to the maximum design speed of 42,000 rpm. A gain-scheduled, MIMO control algorithm was required to control the system modes affected by rotor gyroscopics. The implementation and basis for this control scheme is discussed. The cross-axis forces produced by this approach are described in terms of circumferential cross-coupled stiffness and damping to explain the effect on system stability. Dynamic test results are discussed relative to the rotordynamic and control system design.

Development and Testing of the Backup Bearing System for an AMB Energy Storage Flywheel

2007 ◽  
Author(s):  
Lawrence Hawkins ◽  
Patrick McMullen ◽  
Vinh Vuong
Keyword(s):  
Energy Storage ◽  
Power Conversion ◽  
Time History ◽  
Magnetic Bearing ◽  
High Fidelity ◽  
Active Magnetic Bearings ◽  
Full Speed ◽  
Key Issues ◽  
Efficient Power ◽  
Bearing System

A 140 kW energy storage flywheel has been developed to provide 15 seconds of ride-through power for industrial UPS applications. The flywheel, which operates in a vacuum, is supported by Active Magnetic Bearings (AMB) to minimize bearing losses, and has a high power motor/generator coupled to an efficient power conversion module. The backup bearing system was tested extensively due to the potential for very long spin down times in the event of a failure in or loss of power to the magnetic bearing system. Key issues encountered during testing are discussed and solutions identified. High fidelity orbit and time-history data from a full speed drop and spin down are presented and discussed in detail. The final backup bearing system is capable of three 2.75 hour spin downs from 36,000 rpm.

A superconducting thrust-bearing system for an energy storage flywheel

2002 ◽  
Vol 15 (5) ◽  
pp. 831-835 ◽  
Author(s):  
T A Coombs ◽  
A Cansiz ◽  
A M Campbell
Keyword(s):  
Energy Storage ◽  
Thrust Bearing ◽  
Bearing System

scholarly journals A double-superconducting axial bearing system for an energy storage flywheel model

2008 ◽  
Vol 97 ◽  
pp. 012283 ◽  
Author(s):  
Z Deng ◽  
Q Lin ◽  
G Ma ◽  
J Zheng ◽  
Y Zhang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Bearing System

scholarly journals Design of a Low-Loss, Low-Cost Rolling Element Bearing System for a 5 kWh/100 kW Flywheel Energy Storage System

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7195
Author(s):  
Peter Haidl ◽  
Armin Buchroithner
Keyword(s):  
Energy Storage ◽  
Low Cost ◽  
Storage System ◽  
Energy Storage System ◽  
Operating Conditions ◽  
Flywheel Energy Storage ◽  
Low Loss ◽  
Flywheel Energy Storage System ◽  
Bearing Loads ◽  
Bearing System

The bearings of a flywheel energy storage system (FESS) are critical machine elements, as they determine several important properties such as self-discharge, service life, maintenance intervals and most importantly cost. This paper describes the design of a low-cost, low-loss bearing system for a 5 kWh/100 kW FESS based on analytical, numerical and experimental methods. The special operating conditions of the FESS rotor (e.g., high rotational speeds, high rotor mass, vacuum) do not allow isolated consideration of the bearings alone, but require a systematic approach, taking into account aspects of rotor dynamics, thermal management, bearing loads and lubrication. The proposed design incorporates measures to mitigate both axial and radial bearing loads, by deploying resilient bearing seats and a lifting magnet for rotor weight compensation. As a consequence of minimized external loading, bearing kinematics also need to be considered during the design process. A generally valid, well-structured guideline for the design of such low-loss rolling bearing systems is presented and applied to the 5 kWh/100 kW FESS use case.

Progress and perspectives on halide lithium conductors for all-solid-state lithium batteries

2020 ◽  
Vol 13 (5) ◽  
pp. 1429-1461 ◽  
Author(s):  
Xiaona Li ◽  
Jianwen Liang ◽  
Xiaofei Yang ◽  
Keegan R. Adair ◽  
Changhong Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Solid State ◽  
Lithium Batteries ◽  
Electrochemical Stability ◽  
Superionic Conductors ◽  
Fundamental Understanding ◽  
Potential Applications ◽  
Synthesis Routes

This review focuses on fundamental understanding, various synthesis routes, chemical/electrochemical stability of halide-based lithium superionic conductors, and their potential applications in energy storage as well as related challenges.

An aqueous hybrid electrolyte for low-temperature zinc-based energy storage devices

2020 ◽  
Vol 13 (10) ◽  
pp. 3527-3535 ◽  
Author(s):  
Nana Chang ◽  
Tianyu Li ◽  
Rui Li ◽  
Shengnan Wang ◽  
Yanbin Yin ◽  
...  
Keyword(s):  
Energy Storage ◽  
Low Temperature ◽  
Energy Storage Devices ◽  
Storage Devices

A frigostable aqueous hybrid electrolyte enabled by the solvation interaction of Zn2+–EG is proposed for low-temperature zinc-based energy storage devices.

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