Third Harmonic Utilization in Permanent Magnet Machines

This book investigates the utilization of harmonics in the permanent magnet (PM) or rotor shape to improve the torque density of PM brushless AC machines including three-phase inner rotor and outer rotor machines, five-phase machines, dual three-phase machines, linear machines, by means of analytical, finite element analyses, and as well as experimental validation. 

The torque density can be improved while the torque ripple remains low in PM shaping utilizing the 3rd harmonic. In this book, the analytical expression of output torque is derived for PM machines with rotor shape using the 3rd harmonic, and then the optimal 3rd harmonic for maximizing torque is analytically obtained. 

The book compares the PM shape in surface-mounted PM (SPM) machines and the rotor lamination shape in interior PM (IPM) machines utilizing the 3rd harmonic, and it becomes clear that their shaping methods and amount of torque improvement are different. 

In a five-phase PM machine, the 3rd harmonic can be utilized in both the current waveform and PM shapes to further improve the output torque. For the dual three-phase SPM machines without deteriorating the torque more than 30% when the optimal 3rd harmonic into both the current and PM shape are injected.

The harmonics in airgap flux density have significant influence on the cogging torque, stator iron flux distribution, and radial force between the rotor and stator. These effects has been investigated as well in this book.

2007-2009 Inverter and DSP controller for high speed sensorless control systems.

Technical support of MagneForce motor design software

2007.7-2007.9 Internship position of PM motor design in TECO 

2006-2007 Optimization and development of high-speed sensorless permanent magnet motors

PM machine design for high performance EPS applications

Serial DC motor design for electrical machine tools (Bosch Company)

2004-2005 Optimization design of high speed generator for micro-gas turbine

AWARDS AND ORGANIZATION

2014-present IEEE Senior member

2012 Best paper awards in international conference and exhibition on ecological vehicles and renewable energy

2009-2010 Excellent plan for Ph.D thesis of Zhejiang Univeristy Excellent graduate student of Zhejiang University

2007-2008 First-Class Scholarship for Excellent Student of Zhejiang University

“TECO” Enterprise Scholarship of Zhejiang University

“MPS” Enterprise Scholarship of Zhejiang University

“Wang Guosong” Scholarship of Zhejiang University

Award for paper published on Journal of Applied Physics

2000-2004 Excellent Graduate Student of China Jiliang University

First-Class Scholarship for Excellent Student of China Jiliang University (4 times)