Design and evaluation of a disc-type magnetically geared PM wind generator

This paper presents the design, construction and performance evaluation of a disc-type magnetically geared permanent magnet (MGPM) machine for wind power application. The electromagnetic design for both magnetically coupled and decoupled configurations are described. Considering the complex structure of a MGPM machine, special attention is also paid to the mechanical design aspects. The optimized results show that a torque density in excess of 100 kNm/m³ could be achieved for the active gear part. However, owing to excessive losses in the low speed rotor, the prototype exhibited inferior performance. The design related aspects and issues are analyzed and discussed in detail in an attempt to outline problem areas in the design process. Relevant recommendations are also given for future design improvements.