scholarly journals Flux-Modulated Permanent Magnet Machines: Challenges and Opportunities

2021 ◽  
Vol 12 (1) ◽  
pp. 13
Author(s):  
Qingsong Wang ◽  
Xing Zhao ◽  
Shuangxia Niu
Keyword(s):  
Permanent Magnet ◽  
Electric Vehicle ◽  
Hybrid Electric Vehicle ◽  
Permanent Magnet Machines ◽  
Torque Density ◽  
Rotating Speed ◽  
Current State ◽  
Desirable Feature ◽  
Challenges And Opportunities ◽  
High Torque

High torque density is a desirable feature of electrical machines used in traction applications, such as electric vehicle (EV)/hybrid electric vehicle (HEV) propulsion, wind turbines, more electric aircrafts, etc. The flux-modulated permanent magnet (FMPM) machine is considered as one of the most promising candidates to achieve high torque density. The incorporated gearing effect is ideal in reducing the rotating speed and amplifying the output torque of the FMPM machines. This paper aims at a comprehensive review of the topology evolution of the FMPM machines. Based on different structures, the FMPM machines are grouped into four categories: surface-type FMPM machines, spoke-type FMPM machines, partitioned stator FMPM machines, and bidirectional FMPM machines. The operating principles, advantages, drawbacks, and major applications of the FMPM machines are discussed in detail. In the end, the current state of the art, opportunities, challenges, and future trends of the FMPM machines are discussed. Therefore, this paper offers a systematic guidance on the selection and design of the FMPM machines.

scholarly journals Design studies of inner and outer embedded Permanent Magnet for hybrid electric vehicles

2018 ◽  
Vol 159 ◽  
pp. 02003
Author(s):  
Aravind CV ◽  
Ramani Kannan ◽  
Heng Jing Lei ◽  
Joga Dharma Setiawan
Keyword(s):  
Performance Analysis ◽  
Permanent Magnet ◽  
Numerical Study ◽  
Permanent Magnet Machines ◽  
Flux Flow ◽  
Torque Density ◽  
Wide Range ◽  
Interior Permanent Magnet ◽  
High Torque ◽  
Hybrid Electric

Hybrid vehicles require high torque for propel, hence permanent Magnet machines are highly suiting for the improvement in the torque density. The paper focus on designing built-in interior permanent magnet (IPM) synchronous machine for hybrid electric drive. With the permanent magnet switched from rotor to stator and the characteristics over a wide range of speed operation is studied. The results obtained though performance analysis shows that at 130 rpm high torque with power peaking at around 900 rpm. Both the inner and outer machine are studied using numerical study tool for performance analysis for the application mentioned above. The inner magnet rotor design has provide a better magnetic flux flow due to the larger flux linkage between the permanent magnet and stator pole. Both type of machines are evaluated for torque where the machine with inner magnet provide a higher torque density of 4.94% as compared to the outer magnet machines.

A High-Torque-Density Permanent-Magnet Free Motor for in-Wheel Electric Vehicle Application

2012 ◽  
Vol 48 (6) ◽  
pp. 2287-2295 ◽  
Author(s):  
Saurabh P. Nikam ◽  
Vandana Rallabandi ◽  
B. G. Fernandes
Keyword(s):  
Permanent Magnet ◽  
Electric Vehicle ◽  
Torque Density ◽  
High Torque

Influence of unequal stator tooth width on the performance of outer-rotor permanent magnet machines

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 432-438
Author(s):  
Aimeng Wang ◽  
Dashuang Li
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Machines ◽  
Efficiency Improvement ◽  
Machine Model ◽  
Element Analysis ◽  
Torque Density ◽  
Output Torque ◽  
Tooth Width ◽  
Outer Rotor ◽  
High Torque

AbstractOuter-rotor permanent magnet machines for low-speed and high-torque applications have been used due to their high moment of inertia and torque density. In this paper, the 12-slot/10-pole outer-rotor fractional-slot permanent magnet machine model is established by finite element analysis, the influence of unequal stator tooth width and tooth tip width is investigated for the PM machine, and five different schemes of stator tooth and tip width are designed and analyzed. Detailed comparisons of the performance characteristics of the machines are presented including important issues such as output torque, magnetic field distribution, and tooth flux density. It is shown that the torque density and cogging torque and efficiency can be effectively improved by choosing reasonable tooth and tip width, which lays a foundation for further optimum design and efficiency improvement of the machine.

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