Comparison between rare-earth and ferrite permanent magnet flux-switching generators for gearless wind turbines

Prakht, Vladimir; Dmitrievskii, Vladimir; Kazakbaev, Vadim; Ibrahim, Mohamed N.

doi:10.1016/j.egyr.2020.11.020

Cited by 19 publications

(7 citation statements)

References 10 publications

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“…Finally, the total cost is estimated by multiplying the weight by its corresponding material unit rate. From an economic standpoint, the total PM cost of ferrites is approximately seven times lower than rare earth, based on quotations in Table 3 [28]. At a closer look, it is observed that NRE-FRG requires at least two times the total active mass and 2.7 times (ferrite PM thickness is a little bit high) of the PM mass of RE-FRG in Table 4.…”

Section: Mass and Cost Estimationmentioning

confidence: 98%

Comparative Design and Performance Analysis of 10 kW Rare-Earth and Non-Rare Earth Flux Reversal Wind Generators

2022

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Generators are a key technological element of the wind energy generation system. Currently, there is an increasing interest in adopting non-conventional stator-mounted permanent magnet generators, e.g., flux reversal generators (FRGs), which is a good alternative to conventional synchronous generators for medium-speed wind turbine generator applications. The usage of FRG with rare-earth (RE) permanent magnets (PMs) is increasing due to their high efficiency and high power density factors. However, RE PMs are unattractive to wind generators in terms of their cost and unpredictable market supply. In this paper, an attempt is made to study the potential of FRG with non-rare earths (ferrite PMs) for wind generators. The three-phase, 6/8 pole FRG is designed and compared with RE and NRE PMs for wind generator application at 375 r/min, 10 kW. Using 2D FEA, both the generators are compared in terms of their power generating performance with excellent overload capability. It shows that the average efficiency of the generators is approximately similar, but the torque density of NRE-FRG is only 51% that of RE-FRG. The NRE-FRG design is heavier, with the total active mass being 2.6 times higher than the RE-FRG, but with the estimated total active material cost of both generators almost the same. Moreover, the toque ripple for RE-FRG is 64% higher than for NRE-FRG. The demagnetization risk analysis was performed, and it is found that at higher temperatures, RE-FRG structures are prone to higher demagnetization risks, while it is much lower in NRE-FRGs. In summary, it is found that NRE-FRG is a suitable alternative to RE-FRG for medium-speed wind turbine generator applications in the 10-kW power range.

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Section: Mass and Cost Estimationmentioning

confidence: 98%

Comparative Design and Performance Analysis of 10 kW Rare-Earth and Non-Rare Earth Flux Reversal Wind Generators

2022

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“…PM motors are widely used thanks to their merits such as high torque density, power factor and efficiency [18]. Hence, in this study, the surface mounted PM motor is used in the EMMS.…”

Section: B Optimal Design Of the Emmsmentioning

confidence: 99%

Design and Analysis of Electric Motor With Integrated Magnetic Spring for Cyclic Loads

Ibrahim

Sergeant

2023

IEEE Trans. Ind. Electron.

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Cyclic loads such as weaving looms have an oscillating load torque profile which negatively affects the motor size and power consumption. In this paper, a novel electric motor with an integrated magnetic spring (EMMS) is proposed for cyclic loads. The magnetic spring provides the majority of the oscillating part of the load torque in a passive way, thereby reducing the power consumption. Besides, the design and analysis of the proposed EMMS are investigated for a weaving loom application. Moreover, the optimal design of the EMMS is manufactured and various measurements are obtained to validate the principle of the EMMS. It is found that the EMMS can effectively deliver about 40% of the load torque in a passive way. Interestingly, the amount of the delivered torque by the magnetic spring depends on the design choice. For a given load torque, the higher the part of the torque delivered by the magnetic spring is, the lower the power consumption from the supply will be. However, this increases the manufacturing cost of the EMMS. Therefore, the torque of the magnetic spring is a design choice that is a compromise between the investment cost of the EMMS and the total cost of ownership.

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“…Thus, research and development focus on improving the capacities of existing magnets such as ferrite or aluminium-based magnets [64]. [66] found that ferrite magnets can be an attractive substitute to the REEs magnets, with higher average efficiency and a similar cost in the case of direct-drive wind turbines. The main strategy of the wind power industry is however to switch to alternatives to PMSG that already exist.…”

Section: Wind Power Sectormentioning

confidence: 99%

The Role and Challenges of Rare Earths in the Energy Transition

Depraiter,

Goutte

2023

SSRN Journal

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Comparison between rare-earth and ferrite permanent magnet flux-switching generators for gearless wind turbines

Cited by 19 publications

References 10 publications

Comparative Design and Performance Analysis of 10 kW Rare-Earth and Non-Rare Earth Flux Reversal Wind Generators

Comparative Design and Performance Analysis of 10 kW Rare-Earth and Non-Rare Earth Flux Reversal Wind Generators

Design and Analysis of Electric Motor With Integrated Magnetic Spring for Cyclic Loads

The Role and Challenges of Rare Earths in the Energy Transition

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