Journal ArticleDOI
Optimization Design of Power Factor for an In-Wheel Vernier PM Machine From the Perspective of Air-Gap Harmonic Modulation
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TLDR
An optimization design method of power factor is proposed for vernier permanent magnet (VPM) machine, in which the key is to analyze and investigate the power factor from the perspective of air-gap flux harmonic modulation.Abstract:
In this article, an optimization design method of power factor is proposed for vernier permanent magnet (VPM) machine, in which the key is to analyze and investigate the power factor from the perspective of air-gap flux harmonic modulation. To improve the design efficiency, air-gap harmonics are analyzed and serve as the crucial bridge between power factor and machine geometry. It is noted that, during the operation of the VPM machine, more attention is required for the power factor of low-speed operation area. Based on the popular new European driving cycle of the electric vehicles, three low-speed driving conditions are chosen for the optimization design. For the systematic investigation, a V-shape VPM machine is selected as an optimization example. In order to evaluate conveniently, the comprehensive power factor is defined and sensitive air-gap flux harmonics of different conditions are selected as the optimization objectives, for improving the power factor characteristics in low-speed conditions. In addition, power factor and machine performances are evaluated to validate the proposed method. Finally, the prototype machine is built and tested. Both the simulation and experimental results reveal the feasibility and effectiveness of the proposed method and investigated VPM machine.read more
Citations
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Machine Learning for Design Optimization of Electromagnetic Devices: Recent Developments and Future Directions
TL;DR: To meet modern requirements of high manufacturing/production quality and lifetime reliability, several promising topics, including the application of cloud services and digital twin, are discussed as future directions for design optimization of electromagnetic devices.
Journal ArticleDOI
Research on Magnetic Coupling Characteristic of a Double Rotor Flux-Switching PM Machine From the Perspective of Air-Gap Harmonic Groups
TL;DR: In this article , a double-rotor flux-switching PM machine was used to investigate the magnetic coupling in the perspective of air-gap harmonic groups, where the novelty is to propose the concept of positive coupling harmonics and the negative one.
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Partitioned Stator Hybrid Excited Machine With DC-Biased Sinusoidal Current
TL;DR: In this article , a new partitioned stator hybrid excited (PS-HE) machine with dc-biased sinusoidal current was proposed, where the rotor composed of segmented iron cores is sandwiched between two stators.
Journal ArticleDOI
Design and Optimization of a High-Torque-Density Low-Torque-Ripple Vernier Machine Using Ferrite Magnets for Direct-Drive Applications
TL;DR: In this paper , a split-tooth, concentrated-winding Vernier machine using ferrite magnets is proposed for high-torque, low-speed direct-drive applications in home appliance industry.
Journal ArticleDOI
Critical Review of Direct-Drive Electrical Machine Systems for Electric and Hybrid Electric Vehicles
TL;DR: In this article , the authors provide an overview of automobile direct-drive techniques and recent electrical machine developments for direct drive propulsion systems, and compare them with typical industrial products and discuss the opportunities, challenges, and future development trends.
References
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Journal ArticleDOI
Operation and Design Principles of a PM Vernier Motor
Byung-Taek Kim,Thomas A. Lipo +1 more
TL;DR: In this paper, the back electromotive force and power equations of a PM vernier motor are accurately derived considering an air-gap permeance function expressed in terms of practical machine dimensions.
Journal ArticleDOI
Analysis of Torque Capability and Quality in Vernier Permanent-Magnet Machines
TL;DR: In this paper, a general instantaneous torque equation of VPM machines is proposed to analyze torque features and the effect of parameters on the torque performance of a VPM machine, and based on the general torque equation and a finite-element algorithm, it is verified that torque smoothness is the inherent characteristic of VTM machines, and the torque ripple of VMTs can be below 0.2%.
Journal ArticleDOI
Analysis of Air-Gap Field Modulation and Magnetic Gearing Effect in Fractional-Slot Concentrated-Winding Permanent-Magnet Synchronous Machines
Zi-Qiang Zhu,Yue Liu +1 more
TL;DR: In this paper, the torque production of fractional-slot concentrated-winding (FSCW) permanent-magnet synchronous machines (PMSMs) is analyzed from the perspective of the air-gap field harmonics modulation accounting for slotting effect and it is found that the average torque is produced by both the principle of conventional PMSM and the magnetic gearing effect.
Journal ArticleDOI
Design and Multicondition Comparison of Two Outer-Rotor Flux-Switching Permanent-Magnet Motors for In-Wheel Traction Applications
TL;DR: This paper designs and compares two outer-rotor flux switching permanent-magnet (FSPM) motors, in which the two different PM topologies of the V- shape magnet and I-shape magnet are adopted respectively in their stator structures, which reveals that both of the two motors can be interesting and potential candidates for the in-wheel traction applications.
Journal ArticleDOI
A Quantitative Comparative Analysis of a Novel Flux-Modulated Permanent-Magnet Motor for Low-Speed Drive
Weinong Fu,S.L. Ho +1 more
TL;DR: In this article, a low-speed flux-modulated permanent magnet motor with iron segments in the air gap to modulate the magnetic field has been proposed, and the free space between adjacent stationary iron segments also acts as ventilating ducts.