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A fully coreless Multi-Stator Multi-Rotor (MSMR) AFPM generator with combination of conventional and Halbach magnet arrays
Alexandria Engineering Journal ( IF 6.8 ) Pub Date : 2020-02-21 , DOI: 10.1016/j.aej.2020.01.039
Asiful Habib , Hang Seng Che , Nasrudin Abd Rahim , Mahdi Tousizadeh , Erwan Sulaiman

An axial flux permanent magnet (AFPM) generator is known to be a good candidate for both low and high-speed application. In this paper, a new design of fully coreless multi-stator multi-rotor (MSMR) AFPM generator has been presented with conventional and Halbach magnet arrangement combined with an ironless (epoxy) rotor. For MSMR topology of AFPM machine, back iron is still present in the middle rotor and to maintain the same distribution of magnetic flux, magnets are using on both side of the middle rotor. This paper suggests replacing the middle iron rotors with a single epoxy rotor which reduces the weight of the machine, hence increase power density. On the other hand, for the elimination of iron and magnets in the middle rotor, conventional magnet arrays are used to maintain a continuous flux path. In addition, Halbach array is adopted on the external epoxy rotor to reduce flux leakage on the external sides of the machine. The performance of the proposed generator is investigated in terms of voltage, current, power, power density, and torque ripple. The analytical design approach is first presented and subsequently validated using ANSYS Maxwell® electromagnetic finite element analysis (FEA) software. It is found that a fully coreless MSMR AFPM generator with conventional and Halbach magnet arrays gives higher power density and lower torque ripple with a reduced axial length which is favorable in wind power and pico-hydro applications.



中文翻译:

完全无芯的多定子多转子(MSMR)AFPM发生器,结合了常规磁体和Halbach磁体阵列

众所周知,轴向磁通永磁体(AFPM)发电机是低速和高速应用的理想选择。在本文中,提出了一种新型设计的完全无铁芯多定子多转子(MSMR)AFPM发电机,该发电机具有常规和Halbach磁体布置以及无铁(环氧树脂)转子。对于AFPM机器的MSMR拓扑,中间转子中仍然存在反铁,并且为了保持相同的磁通量分布,中间转子的两侧都使用了磁铁。本文建议用单个环氧树脂转子代替中间铁转子,从而减轻机器的重量,从而提高功率密度。另一方面,为了消除中间转子中的铁和磁体,使用常规的磁体阵列来保持连续的磁通路径。此外,外部环氧转子上采用Halbach阵列,以减少机器外部的磁通泄漏。根据电压,电流,功率,功率密度和转矩脉动研究了拟议发电机的性能。首先介绍了分析设计方法,随后使用ANSYSMaxwell®电磁有限元分析(FEA)软件进行了验证。已经发现,具有常规磁体和Halbach磁体阵列的完全无芯MSMR AFPM发电机可提供更高的功率密度和更低的转矩脉动,并具有减小的轴向长度,这在风力发电和微型水力发电应用中是有利的。首先介绍了分析设计方法,随后使用ANSYSMaxwell®电磁有限元分析(FEA)软件进行了验证。已经发现,具有常规磁体和Halbach磁体阵列的完全无芯MSMR AFPM发电机可提供更高的功率密度和更低的转矩脉动,并具有减小的轴向长度,这在风力发电和微型水力发电应用中是有利的。首先介绍了分析设计方法,随后使用ANSYSMaxwell®电磁有限元分析(FEA)软件进行了验证。已经发现,具有常规磁体和Halbach磁体阵列的完全无芯MSMR AFPM发电机可提供更高的功率密度和更低的转矩脉动,并具有减小的轴向长度,这在风力发电和微型水力发电应用中是有利的。

更新日期:2020-02-21
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