Novel modular and retractable permanent magnet motor/generator for flywheel applications with reduced iron losses in stand‐by mode

García-Gracia, M.; Cova, Miguel Angel; Martínez, Maria Teresa Villén; Usón, Alfonso Aranda

doi:10.1049/iet-rpg.2013.0079

Cited by 16 publications

(7 citation statements)

References 30 publications

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“…Flywheel energy storage tends to use various active/passive magnetic and HTS bearings to reduce the losses caused by friction as well as extend the lifetime for maintenance-free operation. Retractable configurations, i.e., adjustable airgaps [34], [35], and slotless or coreless structures [36] have also been used to reduce the standby power losses. The heat dissipation and thermal analysis of electric machines are of significance if the motor/generators are included in the low-pressure containments considering the very low convective heat transfer in such conditions.…”

Section: B Research and Development Trendsmentioning

confidence: 99%

Overview of Flywheel Systems for Renewable Energy Storage with a Design Study for High-speed Axial-flux Permanent-magnet Machines

Kesgin

Han

Taran

et al. 2019

2019 8th International Conference on Renewable Energy Research and Applications (ICRERA)

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Flywheel energy storage is considered in this paper for grid integration of renewable energy sources due to its inherent advantages of fast response, long cycle life and flexibility in providing ancillary services to the grid, such as frequency regulation, voltage support, etc. The fundamentals of the technology and recent developments are reviewed, firstly with an emphasis on the design considerations and performance metrics. Then the progress and development trends in electric motor/generators employed in flywheel energy storage systems (FESS) are summarized, showing the potential of axial-flux permanent-magnet (AFPM) machines in such applications. Design examples of high-speed AFPM machines are provided and evaluated in terms of specific power, efficiency, and open-circuit losses in order to validate their suitability in FESS.

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Section: B Research and Development Trendsmentioning

confidence: 99%

Overview of Flywheel Systems for Renewable Energy Storage with a Design Study for High-speed Axial-flux Permanent-magnet Machines

Kesgin

Han

Taran

et al. 2019

2019 8th International Conference on Renewable Energy Research and Applications (ICRERA)

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“…In its most simple form, a flywheel is composed of a rotating disc that stores energy in kinetic form, an electric motor/generator (M/G) performing the interchange of electrical-to-mechanical energy and vice versa, and an outer vessel for both vacuum chamber and containment purposes. In order to tackle the three aforementioned challenges, flywheel producers are already focusing on several aspects, such as the design and control of the M/G [13][14][15][16], the disc's material [17], safety and containment [10], or the regulation of torque and force suspensions for longer bearings' life or bearingless solutions [18][19][20]. However, not much attention is being paid to the flywheels' architecture, which indeed has the potential for providing a key contribution in the bespoke scenario.…”

Section: Introductionmentioning

confidence: 99%

Design Trade-Offs and Feasibility Assessment of a Novel One-Body, Laminated-Rotor Flywheel Switched Reluctance Machine

et al. 2020

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In a bid to respond to the challenges being faced in the installation of flywheel-based electric energy storage systems (EESSs) in customer-side facilities, namely high safety, high energy/power densities and low cost, research work towards the development of a novel, one-body, laminated-rotor flywheel, based on a switched reluctance machine (OBOLAR-Fly SR machine) is presented, where the laminated rotor provides both the energy storage and motor/generator functions. The one-body architecture improves compactness and robustness. Besides, the rotor’s laminated body ensures inherently high safety. From the design perspective, the rotor’s dual purpose causes the traditional electrical machines design aspects, such as power development, cooling, losses, torque ripple, etc., to clash with the typical requirements of a flywheel, namely in-vacuum operation and moment of inertia. This results in six main trade-offs to be addressed during the design process: rotor material, speed ratio, number of drive phases, split ratio, optimal vacuum level, and controller hysteresis band. A 60 kW, 2.2 kWh OBOLAR-Fly SR system is developed with a twofold objective: (1) provide an in-depth description of the six bespoke design trade-offs and give some useful guidelines to tackle them; (2) prove the OBOLAR-Fly concept and compare the prototype’s performance with the current state of the art flywheels. Preliminary experimental results prove the viability of the OBOLAR idea and show its competitiveness in terms of efficiency and power density. On the other hand, a gap in energy density to be filled in future research works is highlighted.

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“…Its power density and power conversion efficiency is high and its maintenance cost is low. Consequently, PMSG can be implemented in various utilizations like electric vehicles (EV) and hybrid electric vehicles (HEV) [2,3], home appliances [4], wind generation systems [5], flywheel energy storage systems (FESS) [6] and ultrahigh-speed elevators [7]. The embedded type of the permanent magnet will affect the characteristics of a PMSG.…”

Section: Introductionmentioning

confidence: 99%

Current Control of the Permanent-Magnet Synchronous Generator Using Interval Type-2 T-S Fuzzy Systems

Chang

Tsai

2019

Energies

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The current control of the permanent-magnet synchronous generator (PMSG) using an interval type-2 (IT2) Takagi-Sugeno (T-S) fuzzy systems is designed and implemented. PMSG is an energy conversion unit widely used in wind energy generation systems and energy storage systems. Its performance is determined by the current control approach. IT2 T-S fuzzy systems are implemented to deal with the nonlinearity of a PMSG system in this paper. First, the IT2 T-S fuzzy model of a PMSG is obtained. Second, the IT2 T-S fuzzy controller is designed based on the concept of parallel distributed compensation (PDC). Next, the stability analysis can be conducted through the Lyapunov theorem. Accordingly, the stability conditions of the closed-loop system are expressed in Linear Matrix Inequality (LMI) form. The AC power from a PMSG is converted to DC power via a three-phase six-switch full bridge converter. The six-switch full bridge converter is controlled by the proposed IT2 T-S fuzzy controller. The analog-to-digital (ADC) conversion, rotor position calculation and duty ratio determination are digitally accomplished by the microcontroller. Finally, simulation and experimental results verify the performance of the proposed current control.

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Novel modular and retractable permanent magnet motor/generator for flywheel applications with reduced iron losses in stand‐by mode

Cited by 16 publications

References 30 publications

Overview of Flywheel Systems for Renewable Energy Storage with a Design Study for High-speed Axial-flux Permanent-magnet Machines

Overview of Flywheel Systems for Renewable Energy Storage with a Design Study for High-speed Axial-flux Permanent-magnet Machines

Design Trade-Offs and Feasibility Assessment of a Novel One-Body, Laminated-Rotor Flywheel Switched Reluctance Machine

Current Control of the Permanent-Magnet Synchronous Generator Using Interval Type-2 T-S Fuzzy Systems

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