NDLI: Improved V-shaped interior permanent magnet rotor topology with inward-extended bridges for reduced torque ripple

Content Provider	IET Digital Library
Author	Gao, Peng Sun, Xibin Gerada, David Gerada, Chris Wang, Xiaoyuan
Abstract	Interior permanent magnet synchronous machines (IPMSMs) with V-shaped permanent magnet (PM) rotors are widely used as traction motors in electric vehicles because of their high torque density and high efficiency. However, the V-shape IPMSMs have the disadvantages of inevitable torque ripple due to the non-sinusoidal air-gap flux density distribution and the utilisation of the reluctance torque. In this study, with the aim of improving the torque ripple characteristics, a modified V-shaped IPMSM rotor configuration with bridges extended inwards towards the pole centre is proposed to generate a more sinusoidal air-gap flux density waveform. The proposed topology, referred to as ‘Type C’ within this study, is compared with baseline rotor configuration references, namely ‘Type A’ which is a conventional V-shaped PM rotor, as well as ‘Type B’ which is a related configuration with a mechanically non-uniform air gap. The analysis results show that the rotor ‘Type C’ exhibits significant advantages in terms of reducing cogging torque, torque ripple and radial force, without incurring additional air-gap friction losses. Finally, a prototype of the IPMSM with the proposed rotor configuration is manufactured and tested, verifying the predicted benefits experimentally.
Starting Page	2404
Ending Page	2411
Page Count	8
ISSN	17518660
Volume Number	14
e-ISSN	17518679
Issue Number	Issue 12, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/14/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2019.0850
Journal	IET Electric Power Applications
Publisher Date	2020-08-20
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Air Gap D.C. Machines Electric Vehicle Interior Permanent Magnet Synchronous Machine Inward-extended Bridges Nonsinusoidal Air-gap Flux Density Distribution Permanent Magnet Motors Radial Force Reduced Torque Ripple Rotors Sinusoidal Air-gap Flux Density Waveform Synchronous Machine Torque Traction Motors Transportation V-shaped Interior Permanent Magnet Rotor Topology
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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