Analysis of On-Load Magnetization Characteristics in a Novel Partitioned Stator Hybrid Magnet Memory Machine

Yang, Hui; Zhu, Z. Q.; Lin, Heyun; Guo, Kun; Guo, Yujing; Fang, Shuhua; Huang, Yunkai

doi:10.1109/tmag.2017.2661757

Cited by 9 publications

(10 citation statements)

References 6 publications

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“…For the dc-type MMs, the switched flux (SF) structures were recently extended to MMs [15]- [19], which exhibit convenient online magnetization control, thermal management, and rotor robustness. Although the armature reaction and LCF PM fields are parallel, the possibility of unexpected demagnetization may still exist particularly under on-load operation [14], [19]. This is mainly attributed to the magnetic susceptibility of LCF PMs and severe localized magnetic saturation caused by hybrid magnets and armature reaction within the stator.…”

Section: Introductionmentioning

confidence: 99%

Influence of Design Parameters on On-Load Demagnetization Characteristics of Switched Flux Hybrid Magnet Memory Machine

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Influence of Design Parameters on On-Load Demagnetization Characteristics of Switched Flux Hybrid Magnet Memory Machine

et al. 2019

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“…As a viable solution to perform PM magnetization state (MS), the concept of "memory machine (MM)" is proposed and extensively investigated [4]- [17]. Due to the utilization of low coercive force (LCF) PMs, the flexible air-gap flux adjustment can be achieved by applying a temporary current pulse to magnetize LCF PMs.…”

Section: Introductionmentioning

confidence: 99%

“…Manuscript Generally, MMs can be categorized into ac-and dc-magnetized types according to the winding types supplying the current pulse. Compared to ac-magnetized MMs [4]- [8] resorting to a d-axis current pulse and relatively complicated flux control, dc-magnetized MMs [9]- [17] with auxiliary dc magnetizing coils benefit from more expedient online MS control. The structures of doubly salient [9]- [12] and switched flux [13]- [17] are extended to dc-magnetized MMs.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, two sets of magnets are used in order to improve the torque density, i.e., NdFeB and LCF PMs. Nevertheless, due to the crowded stator issue in single-stator dc-magnetized MMs [9]- [17], the torque density is inevitably compromised. In order to alleviate this issue, a partitioned stator switched-flux MM (PS-SFMM) is developed [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, high torque density and energy-efficient flux control capability can be simultaneously realized. However, the previous studies mainly focus on the new topology development [15], [16] and performance analysis [17] in individual cases. Nonetheless, the feasibility of possible magnetic circuits and the corresponding characteristic investigation for the PS-SFMMs remains unreported.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of Partitioned Stator Memory Machines With Series and Parallel Hybrid PM Configurations

et al. 2019

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orcid.org/0000-0001-7175-3307 et al. (3 more authors) (2019) Comparative study of partitioned stator memory machines with series and parallel hybrid PM configurations. IEEE Transactions on Magnetics. In this paper, the partitioned stator (PS) structure is extended to variable-flux memory machines, forming two newly emerged PS switched-flux memory machines (PS-SFMMs) with series and parallel hybrid magnet configurations. From the perspective of geometry, both two PS-SFMMs share identical outer stator and rotor segments, while two different types of permanent magnet (PM) arrangements are employed in the inner stationary part. Thus, the developed machines can inherent the geometric separation of the armature winding and PM excitations from the PS design, thus achieving acceptable torque capability, and excellent air-gap flux control. A comparative study between PS-SFMMs with series and parallel structures is established. First, the topologies and operating principle are introduced, respectively. In addition, the design tradeoffs and PM sizing of the two PS machines are revealed and optimized with a simplified magnetic circuit model. Then, the electromagnetic characteristics of PS-SFMMs with different magnetic circuits are investigated and compared with the finite-element (FE) method. The FE results are validated by the experiments on a parallel prototype. Index Terms-Hybrid permanent magnet (PM), memory machine (MM), parallel magnetic circuit, partitioned stator (PS), series magnetic circuit.

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Magnetic stability of low corrective force PM in series hybrid magnet memory machine under inverter open-circuit fault

et al. 2023

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Variable flux memory machine (VFMM) can dynamically adjust its air-gap magnetic field by changing the magnetization states of the employed low corrective force (LCF) permanent magnets (PMs). Due to the demagnetization risk of LCF PMs under armature current, it is necessary to analyze their magnetic stability in various operation states. The magnetic stability of LCF PMs in series hybrid magnet VFMM (SHM-VFMM) under inverter open-circuit (IOC) fault is studied in this article. Firstly, the topology of the investigated SHM-VFMM is introduced, and the field-circuit coupled model of the machine under IOC fault is established. Then, the magnetic stabilities of LCF PMs during the normal and fault operations are analyzed and compared by using the finite element method. The effects of LCF PM demagnetization and fault current on torque are also studied. Afterward, the influence mechanism of the fault armature magnetomotive force (MMF) on LCF PM demagnetization is revealed by using the synthetic MMF graphic method. Finally, the main factor affecting the LCF PM demagnetization under IOC fault is highlighted and an effective method for recovering the magnetic stability of LCF PM is proposed.

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Analysis of On-Load Magnetization Characteristics in a Novel Partitioned Stator Hybrid Magnet Memory Machine

Cited by 9 publications

References 6 publications

Influence of Design Parameters on On-Load Demagnetization Characteristics of Switched Flux Hybrid Magnet Memory Machine

Influence of Design Parameters on On-Load Demagnetization Characteristics of Switched Flux Hybrid Magnet Memory Machine

Comparative Study of Partitioned Stator Memory Machines With Series and Parallel Hybrid PM Configurations

Magnetic stability of low corrective force PM in series hybrid magnet memory machine under inverter open-circuit fault

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