TY - JOUR
T1 - Design and analysis of a novel axial-radial flux permanent magnet machine with Halbach-Array permanent magnets
AU - Huang, Rundong
AU - Liu, Chunhua
AU - Song, Zaixin
AU - Zhao, Hang
N1 - Funding Information:
Funding: This work was supported in part by a grant (Project No. 52077186 and 51677159) from the Natural Science Foundation of China (NSFC), China; in part by a grant (Project No. JCYJ20180307123918658) from the Science Technology and Innovation Committee of Shenzhen Municipality, Shenzhen, China; in part by a grant (Project No. ITP/027/19AP) from the Innovation and Technology Commission, Hong Kong SAR; and in part by Strategic Research Grant and Ap‐ plied Research Grant (Project No. CityU11218519, CityU11217520 and ARG9667214) from the City University of Hong Kong, Hong Kong SAR.
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/6/2
Y1 - 2021/6/2
N2 - 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 fi-nite-element analysis (FEA) was conducted to show the merits of the ARFPM machine. Demon-stration results with different parameters are compared to obtain an optimal structure. These in-dicated 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.
AB - 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 fi-nite-element analysis (FEA) was conducted to show the merits of the ARFPM machine. Demon-stration results with different parameters are compared to obtain an optimal structure. These in-dicated 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.
KW - 3D finite-element analysis (FEA)
KW - Axial-radial flux permanent magnet (ARFPM) machine
KW - Comparative analysis
KW - Halbach-array permanent magnets
KW - High torque density
KW - Permanent-magnet machine
UR - http://www.scopus.com/inward/record.url?scp=85108874241&partnerID=8YFLogxK
U2 - 10.3390/en14123639
DO - 10.3390/en14123639
M3 - Journal article
AN - SCOPUS:85108874241
SN - 1996-1073
VL - 14
JO - Energies
JF - Energies
IS - 12
M1 - 3639
ER -
