scholarly journals General Design Method of Flywheel Rotor for Energy Storage System

2012 ◽  
Vol 16 ◽  
pp. 359-364 ◽  
Author(s):  
Yongjie Han ◽  
Zhengyi Ren ◽  
Yongxiang Tong
Keyword(s):  
Energy Storage ◽  
Design Method ◽  
Storage System ◽  
Energy Storage System ◽  
General Design ◽  
Flywheel Rotor

scholarly journals A trial manufacturing of 0.2kWh class flywheel rotor supported by superconducting magnetic bearing for energy storage system

1997 ◽  
Vol 117 (9) ◽  
pp. 1132-1138 ◽  
Author(s):  
Ryoichi Takahata ◽  
Hiromasa Higasa ◽  
Hirochika Ueyama ◽  
Yasukata Miyagawa ◽  
Hironori Kameno ◽  
...  
Keyword(s):  
Energy Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Magnetic Bearing ◽  
Flywheel Rotor ◽  
Superconducting Magnetic Bearing

Dimension Optimization and Theoretical Calculation of Flywheel Rotor for Vehicle Energy Storage System

2011 ◽  
Vol 121-126 ◽  
pp. 3234-3237 ◽  
Author(s):  
Xu Zhang ◽  
Wei Wei Cui ◽  
Li Wei Li ◽  
Ji Jun Cui ◽  
Yang Cao ◽  
...  
Keyword(s):  
Energy Storage ◽  
Theoretical Calculation ◽  
Radial Displacement ◽  
Storage System ◽  
Energy Storage System ◽  
High Energy ◽  
System Structure ◽  
Flywheel Energy Storage System ◽  
Energy Storage Efficiency ◽  
Flywheel Rotor

A novel kind of flywheel energy storage system structure for vehicle is put forward and studied. Flywheel rotor dimension optimization is achieved adopting genetic algorithm on MATLAB program, optimized dimension is helpful for the realization of high energy storage efficiency. Based on certain uniform ring simplification of flywheel rotor shape and applying elastic mechanics solution, theoretical calculation of radial displacement and stress is accomplished. Solved radial displacement, radial stress and hoop stress can be applied in practice for further precise design in the view of mechanical strength.

A Design of Flywheel Energy Storage System Discharge Circuit Based on PWM Technology

2014 ◽  
Vol 494-495 ◽  
pp. 1569-1572
Author(s):  
Ling Bo Zheng ◽  
Guang Jun Li
Keyword(s):  
Energy Storage ◽  
Design Method ◽  
Storage System ◽  
Energy Storage System ◽  
Discharge Circuit ◽  
Pwm Control ◽  
Flywheel Energy Storage ◽  
Discharge System ◽  
Flywheel Energy Storage System ◽  
Working Principle

This template explains and demonstrates how to prepare your camera-ready paper for a flywheel energy storage system discharge circuit based on PWM control technology is introduced. The main circuit structure is given and the working principle is analyzed. On that basis, the detailed design method of high-frequency transformer, PWM control circuit and the driving circuit is introduced. The discharge system with the output power of 480W and the output voltage of +48V is designed by applying the method and the experimental waveforms are provided.

scholarly journals Analysis of Standby Losses and Charging Cycles in Flywheel Energy Storage Systems

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4441
Author(s):  
Mustafa E. Amiryar ◽  
Keith R. Pullen
Keyword(s):  
Energy Storage ◽  
Aerodynamic Drag ◽  
Storage System ◽  
Technical Information ◽  
Energy Storage System ◽  
Molecular Flow ◽  
Flywheel Energy Storage ◽  
Loss Assessment ◽  
Flywheel Rotor ◽  
Bearing Friction

Aerodynamic drag and bearing friction are the main sources of standby losses in the flywheel rotor part of a flywheel energy storage system (FESS). Although these losses are typically small in a well-designed system, the energy losses can become significant due to the continuous operation of the flywheel over time. For aerodynamic drag, commonly known as windage, there is scarcity of information available for loss estimation since most of the publications do not cover the partial vacuum conditions as required in the design of low loss energy storage flywheels. These conditions cause the flow regime to fall between continuum and molecular flow. Bearings may be of mechanical or magnetic type and in this paper the former is considered, typically hybridized with a passive magnetic thrust bearing. Mechanical bearing loss calculations have been extensively addressed in the open literature, including technical information from manufacturers but this has not previously been presented clearly and simply with reference to this application. The purpose of this paper is therefore to provide a loss assessment methodology for flywheel windage losses and bearing friction losses using the latest available information. An assessment of windage losses based on various flow regimes is presented with two different methods for calculation of windage losses in FESS under rarefied vacuum conditions discussed and compared. The findings of the research show that both methods closely correlate with each other for vacuum conditions typically required for flywheels. The effect of the air gap between the flywheel rotor and containment is also considered and justified for both calculation methods. Estimation of the bearing losses and considerations for selection of a low maintenance, soft mounted, bearing system is also discussed and analysed for a flywheel of realistic dimensions. The effect of the number of charging cycles on the relative importance of flywheel standby losses has also been investigated and the system total losses and efficiency have been calculated accordingly.

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