Analytical Investigation of the Magnetic-Field Distribution in an Axial Magnetic-Field-Modulated Brushless Double-Rotor Machine

Tong, Chengde; Song, Zhiyi; Bai, Jingang; Liu, Jiaqi; Zheng, Ping

doi:10.3390/en9080589

Cited by 7 publications

(4 citation statements)

References 22 publications

(24 reference statements)

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“…The goal of the study on electromagnetic torque is to find the largest torque with the same outer diameter. As shown in (5), the electromagnetic torque is related to the inner diameter in addition to the depth of the air gap, but the relationship is not monotonous. Hence, the electromagnetic torque at different inner diameters is calculated.…”

Section: Study Of Electromagnetic Torquementioning

confidence: 99%

“…The development of the RFPM machines is very mature. However, in many applications, mechanical gears are necessary to improve the torque, while they increase the manufacture and maintenance cost, as well as the system volume [4][5][6]. In order to avoid the mechanical gears, the axial flux permanent magnet (AFPM) machine has recently attracted much attention from scholars [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

et al. 2021

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Electric machines with high torque density are needed in many applications, such as electric vehicles, electric robotics, electric ships, electric aircraft, etc. and they can avoid planetary gears thus reducing manufacturing costs. This paper presents a novel axial-radial flux permanent magnet (ARFPM) machine with high torque density. The proposed ARFPM machine integrates both axial-flux and radial-flux machine topologies in a compact space, which effectively improves the copper utilization of the machine. First, the radial rotor can balance the large axial forces on axial rotors and prevent them from deforming due to the forces. On the other hand, the machine adopts Halbach-array permanent magnets (PMs) on the rotors to suppress air-gap flux density harmonics. Also, the Halbach-array PMs can reduce the total attracted force on axial rotors. The operational principle of the ARFPM machine was investigated and analyzed. Then, 3D finite-element analysis (FEA) was conducted to show the merits of the ARFPM machine. Demonstration results with different parameters are compared to obtain an optimal structure. These indicated that the proposed ARFPM machine with Halbach-array PMs can achieve a more sinusoidal back electromotive force (EMF). In addition, a comparative analysis was conducted for the proposed ARFPM machine. The machine was compared with a conventional axial-flux permanent magnet (AFPM) machine and a radial-flux permanent magnet (RFPM) machine based on the same dimensions. This showed that the proposed ARFPM machine had the highest torque density and relatively small torque ripple.

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Section: Study Of Electromagnetic Torquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

et al. 2021

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“…Stator slotting effect on the magnetic-field distribution is important that it induces motor's eddy current core loss [17,18]. To investigate effect of the suggested slot opening shape on the slotting effect, we calculated airgap magnetic flux density around a single slot of Ref., Case 1, and Case 2 of Table 1.…”

Section: Slotting Effectmentioning

confidence: 99%

Modified Slot Opening for Reducing Shaft-to-Frame Voltage of AC Motors

Yea

Han

2020

Energies

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This paper presents a method to reduce the winding-to-rotor capacitance of electrical machines for the purpose of suppressing shaft-to-frame voltage, which causes reliability issues, such as electromagnetic interference (EMI) and bearing current. The proposed method is based on the modification of slot opening shape of the stator core, including the variation of slot opening width and the use of oblique slot opening. For the verification of the suggested method, six different slot opening shapes, including a reference design, are analyzed and compared using finite element analysis, and the results show that the proposed method can reduce the shaft-to-frame voltage by 98%, compared to the reference design.

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“…Based on the research status, the methods for establishing the FMPMM model can be divided into three categories: the analytical model method [20][21][22], the finite element analysis (FEA) [17][18][19]23,24] and the equivalent magnetic network (EMN) [25,26]. In [27], an analytical model of the FMPMM was established by the subdomain method.…”

Section: Introductionmentioning

confidence: 99%

Demagnetization Modeling and Analysis for a Six-Phase Surface-Mounted Field-Modulated Permanent-Magnet Machine Based on Equivalent Magnetic Network

Li,

Tan,

Yan

et al. 2023

Energies

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Based on the magnetic gear effect, the field-modulated permanent-magnet machine (FMPMM) can realize the unequal pole design of the rotor PM field and the stator armature magnetic field. With the advantages of high torque density and high efficiency, the FMPMM has been widely studied in low-speed direct-drive applications. As a kind of machine excited by PMs, the performance of the FMPMM was affected by the demagnetization state. However, the method for establishing the FMPMM demagnetization model based on a finite element analysis (FEA) presented some problems, including tedious repeated modeling work and long calculation time-consuming under fine subdivision. Therefore, in this paper, a six-phase surface-mounted FMPMM was taken as an example, and an equivalent magnetic network (EMN) model was proposed for evaluating the machine performance under demagnetization. In order to realize the rapid establishing EMN models under diverse demagnetization types, the variable coercivity of PM was introduced. Furthermore, for the purpose of improving the calculation accuracy and shortening the calculation time, the least square method was used in fitting and analyzing the discrete results. Then, in order to verify the validity of the proposed EMN model, a prototype was fabricated and a testing platform was built. The air-gap flux density and the no-load back EMF obtained by the FEA, the proposed EMN model, and the experimental testing were compared. The results showed that the proposed EMN model can realize the rapid modeling and accurate analysis of the six-phase surface-mounted FMPMM under diverse demagnetization types.

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Analytical Investigation of the Magnetic-Field Distribution in an Axial Magnetic-Field-Modulated Brushless Double-Rotor Machine

Cited by 7 publications

References 22 publications

Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

Modified Slot Opening for Reducing Shaft-to-Frame Voltage of AC Motors

Demagnetization Modeling and Analysis for a Six-Phase Surface-Mounted Field-Modulated Permanent-Magnet Machine Based on Equivalent Magnetic Network

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