《用于风机的低速直驱永磁发电机设计(英语论文)》由会员分享，可在线阅读，更多相关《用于风机的低速直驱永磁发电机设计(英语论文)（62页珍藏版）》请在金锄头文库上搜索。
1、El 101 ACTA POLYTECHNICA SCANDINAVICA ELECTRICAL ENGINEERING SERIES No. 101 Directly Driven, Low-Speed Permanent-Magnet Generators for Wind Power Applications PETRI LAMPOLA Helsinki University of Technology Laboratory of Electromechanics P.O.Box 3000 FIN-02015 HUT Finland Dissertation for the degree
2、 of Doctor of Science in Technology to be presented with due permission of the Department of Electrical Engineering, for public examination and depate in Auditorium S4 at Helsinki University of Technology (Espoo, Finland) on the 29th of May, 2000, at 12 noon. ESPOO 2000 2 Lampola, P., Directly Drive
3、n, Low-Speed Permanent-Magnet Generators for Wind Power Applications. Acta Polytechnica Scandinavica, Electrical Engineering Series, No.101, Espoo, 2000, 62 p. (+106 p.). Published by the Finnish Academies of Technology. ISBN 951-666-539-X. ISSN 0001-6845. UDC 621.313.8/.12:621.311.245. Keywords: Pe
4、rmanent-magnet generator, gearless wind turbine, directly driven, low speed ABSTRACT The rotor of a typical wind turbine rotates at a speed of 20-200 rpm. In conventional wind power plants the generator is coupled to the turbine via a gear so that it can typically rotate at a speed of 1000 or 1500 r
5、pm. The wind power plant can be simplified by eliminating the gear and by using a low-speed generator, the rotor of which rotates at the same speed as the rotor of the turbine. The hypothesis in this work is that the typical generator-gear solution in the wind power plant can be replaced by a low-sp
6、eed PM synchronous generator. This thesis deals with the electromagnetic design and the optimisation of two types of low- speed generators for gearless wind turbines. The generators designed are radial-flux permanent- magnet synchronous machines excited by NdFeB magnets. The machines have different
7、kinds of stator windings. The first machine has a conventional three-phase, diamond winding. The second machine has a three-phase, unconventional single-coil winding consisting of coils which are placed in slots around every second tooth. The electromagnetic optimisation of the machine is done by th
8、e finite element method and by a genetic algorithm combined with the finite element method. The rated powers of the machines optimised are 500 kW, 10kW and 5.5kW. Two prototype machines were built and tested. The optimisation of the machines shows that the cost of active materials is smaller and the
9、 pull- out torque per the cost of active materials higher in the conventional machines than in the single- coil winding machines. The torque ripple can be reduced to a low level by choosing a suitable magnet and stator slot shape in both the designs. The demagnetisation of permanent magnets is easie
10、r to avoid in the single-coil winding machines than in the conventional designs. The investigation of various rotor designs shows that the rotor equipped with curved surface-mounted magnets has various advantages compared with the other rotor designs, for instance pole shoe versions. The analysis of
11、 the machines also shows that the load capacity of the machine is lower in a diode rectifier load than that when connected directly to a sinusoidal grid. According to the analysis, a typical generator-gear solution of the wind power plant can be replaced by a multipole radial-flux PM synchronous mac
12、hine. The conventional diamond winding machine is a better choice for the design of a directly driven wind turbine generator but the single- coil winding machine is also suitable because of its simplicity. All rights reserved. No part of the publication may be reproduced, stored in a retrieval syste
13、m, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the author. 3 PREFACE This research was accomplished in the Laboratory of Electromechanics, Helsinki University of Technology, Finland. The work is appli
14、ed to the design and the optimisation of directly driven, low-speed generators for wind power applications. I would like to express gratitude to my supervisor, Professor Tapani Jokinen, Head of the Laboratory of Electromechanics, Helsinki University of Technology, for his support and encouraging att
15、itude to my work. Special thanks are reserved for Professor Jorma Luomi. I am grateful that it has been possible to stay at the Department of Electrical Machines and Power Electronics, Chalmers University of Technology, Sweden, during the period February - July 1994. I would also like to thank him f
16、or his good advice on academic writing. Further I would like to thank Mr Jarmo Perho, Dr Juhani Tellinen, Dr Antero Arkkio, Dr Janne Vnnen, Dr Sakari Palko and Dr Juha Saari, for the interesting and successful co-operation in the field of computation, electrical machines and wind power plants. I would like to thank Mr Pertti Saransaari and Mr Jouko Virta from KCI Motors Corporation for interest in my project and for manufacturing the prototype machine. I also wish to thank the members of th
