Design of a Magnetic-Geared Outer-Rotor Permanent-Magnet Brushless Motor for Electric Vehicles

Chau, K. T.; Zhang, Dong; Jiang, J.Z.; Liu, Chunhua; Zhang, Yuejin

doi:10.1109/tmag.2007.893714

Cited by 357 publications

(136 citation statements)

References 3 publications

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“…Figure 14a shows the basic structure of a coaxial magnetic gear. By simply integrating the coaxial magnetic gear into a PM motor [50], as shown in Figure 14b, LSLT operation can be obtained. As compared to traditional PM motors, the magnetic-geared in-wheel motor offers higher torque density and less cogging torque [51], hence being more suitable for the in-wheel drive system than other motor topologies.…”

Section: Magnetic-geared In-wheel Drive Systemmentioning

confidence: 99%

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

et al. 2015

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Abstract:The paper presents a number of advanced solutions on electric machines and machine-based systems for the powertrain of electric vehicles (EVs). Two types of systems are considered, namely the drive systems designated to the EV propulsion and the power split devices utilized in the popular series-parallel hybrid electric vehicle architecture. After reviewing the main requirements for the electric drive systems, the paper illustrates advanced electric machine topologies, including a stator permanent magnet (stator-PM) motor, a hybrid-excitation motor, a flux memory motor and a redundant motor structure. Then, it illustrates advanced electric drive systems, such as the magnetic-geared in-wheel drive and the integrated starter generator (ISG). Finally, three machine-based implementations of the power split devices are expounded, built up around the dual-rotor PM machine, the dual-stator PM brushless machine and the magnetic-geared dual-rotor machine. As a conclusion, the development trends in the field of electric machines and machine-based systems for EVs are summarized.

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Section: Magnetic-geared In-wheel Drive Systemmentioning

confidence: 99%

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

et al. 2015

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“…According to the number of air gaps, the existing MGPM machines can be classified as three viable topologies as shown in Figure 12. Relatively speaking, the concept of the three-airgap MGPM machine (Figure 12(a)) is so straightforward that it was proposed first, and its characteristics have been extensively studied [46,47]. In essence, the three-airgap topology is a simple combination of an outer-rotor PM machine with a CMG, in which the interaction of magnetic field distributions between the embedded PM machine and the outer gear is insignificant.…”

Section: Viable Topologies Of Mgpm Machinesmentioning

confidence: 99%

“…For a fair comparison, the overall outside diameter, axial length and airgap length of the three MGPM machines are the same, which are actually the dimensions of the three-airgap MGPM machine designed in [46]. Meanwhile, the results presented in this section are based on the optimal design of individual MGPM machines by using the FEA.…”

Section: Performance Comparison Of Mgpm Machinesmentioning

confidence: 99%

Comparison of Magnetic-Geared Permanent-Magnet Machines

Li¹,

Chau²,

Cheng³

et al. 2013

PIER

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Abstract-With the advent of magnetic gears, researchers have developed a new breed of permanent-magnet machines. These magnetic-geared permanent-magnet machines artfully incorporate the concept of magnetic gearing into the permanent-magnet machines, leading to achieve low-speed high-torque direct-drive operation. In this paper, a quantitative comparison of three viable magnetic-geared permanent-magnet machines is firstly performed, hence revealing their key features, merits, demerits and applications.Initially, the development of the magnetic gears, including the converted topologies and field-modulated topologies, is reviewed. Then, three viable magnetic-geared permanent-magnet machines are identified and discussed. Consequently, the corresponding performances are analyzed and quantitatively compared. The results and discussions form an important foundation for research in low-speed high-torque direct-drive systems.

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“…1, due to low speed high torque characteristic. MG machines can be potentially applied to electric vehicles (EVs) [21], hybrid electric vehicles (HEVs) [22], and wind turbines [23], [24], as well as high performance motion control applications [25]. For the magnetic gear with two rotating PM bodies whilst the iron pieces are static as analyzed in [14] and [15], the MG machine analyzed in [18] can be obtained by displacing one rotating PM body using an equivalent armature winding stator, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Partitioned Stator Flux Reversal PM Machine and Magnetically Geared Machine Operating in Stator-PM and Rotor-PM Modes

Zhu

Zhan

2017

IEEE Trans. Energy Convers.

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A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription.For more information, please contact the WRAP Team at: wrap@warwick.ac.uk 1Abstract-In this paper, the partitioned stator flux reversal permanent magnet (PM) (PS-FRPM) machine and the conventional magnetically geared (MG) machine operating in both stator-PM (SPM) and rotor-PM (RPM) modes are comparatively analyzed in terms of electromagnetic performance to provide design guides for a MG machine regarding: (a) a SPM or RPM type machine and (b) a higher or lower gear ratio machine. It is found that a SPM type machine is recommended, since both PS-FRPM and MG machines operating in SPM modes have a higher phase back-EMF and hence torque than their RPM counterparts, respectively, as a result of a similar phase flux-linkage but a higher electric frequency since the iron piece number is larger than the PM pole-pair number. Moreover, a smaller gear ratio machine is preferred from the perspective of a higher power factor and hence a lower inverter power rating, as the conventional MG machines with higher gear ratios suffer from larger fluxleakage, higher synchronous reactance and hence lower power factors, as well as higher iron losses, than the PS-FRPM machines. However, higher gear ratio machines feature lower cogging torques and torque ripples due to the smaller difference between the PM pole-pair number and iron piece number. Both prototypes of PS-FRPM machine operating in SPM mode and MG machine operating in RPM mode are built and tested to verify the FE predicted results.Index Terms-Flux modulated machine, flux reversal, magnetically geared (MG) machine, partitioned stator, permanent magnet (PM), power factor, rotor-permanent magnet, stator-permanent magnet.

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Design of a Magnetic-Geared Outer-Rotor Permanent-Magnet Brushless Motor for Electric Vehicles

Cited by 357 publications

References 3 publications

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

Comparison of Magnetic-Geared Permanent-Magnet Machines

Comparative Analysis of Partitioned Stator Flux Reversal PM Machine and Magnetically Geared Machine Operating in Stator-PM and Rotor-PM Modes

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