Validation of Eddy Current Loss Models for Permanent Magnet Machines with Concentrated Windings

Acknowledgement Thanks to my parents. Without your spiritual and financial supports, I could not have got the chance to study in the Netherlands and finish my master programme at TU Delft. I feel very sorry that you must have been feeling alone without the only child at home. Thank you all the time for your understanding. Thanks to my supervisor Dr. Henk Polinder. You have given me great help and advice and you are so kind that I cannot complaint anything about working with you. I am very willing to go on studying electrical machines under your supervision. Thanks to Anoop Jassal who is my friend and my tutor. Thank you for giving me the opportunity to do the internship at XEMC Darwind B.V. and for offering me a very challenging but interesting graduation project. I was really enjoying when we fought together to fulfill this project. I was so lucky to meet you. Thanks to Prof. Ferreira who leads a very competitive research group. I have been growing rapidly in EPP group and I hope to learn more from you on the field of electromagnetics. Thanks to Domenico Lahaye for your guide of finite element methods which benefited me in the thesis project and will also be beneficial in the future. Thanks to Ren Yating and Venugopal Prasanth for studying together with me in the EPP student room. I would have been feeling alone if you were not there. Thanks to Kasper Zwetsloot and other laboratory staff who often helped me with the setups and instruments. Many thanks should also be given to my master classmates at TU Delft, my colleagues at XEMC Darwind B.V and all people who supplied power to me and made me going forward. Abstract Concentrated windings are considered to replace distributed windings for permanent magnet electrical machines as they save manufacture time and costs and even can be produced with automatic processes. Compared with distributed windings, however, concentrated windings lead to much more eddy current losses in the rotor of machines due to a great number of space harmonics of magnetic field. These losses result in much heat that could do harm to the machines. Investigating eddy current losses is therefore necessary in designing electrical machines with concentrated windings. Analytical and finite element models are proposed to predict these eddy current losses in magnets and rotor back-iron. The accuracy of such models must be …