PM machines with fractional slot concentrated winding are increasingly used in various industry applications owing to their many advantages. However, they are characterized by high content of space harmonics m the air-gap MMF distribution which generate undesirable effects and in some cases they limit the use of these winding types. To overcome the drawbacks of concentrated winding, this paper presents a novel solution for reduction of air-gap flux-density sub-harmonics for concentrated windings using magnetic flux barriers in specific stator teeth regions. Simultaneously, the new solutions increase the efficiency of the working harmonic and with this the power density of the electric machine. The new technique is used for designing a PM machine with 12-teeth/14-poles concentrated and single layer winding. Under the same electrical and geometrical constrains, the conventional stator and the new stator with flux barriers in stator teeth are consider and the obtained results are compared. It is shown here that the new stator structure improves enormously the performances of the PM machines with the concentrated windings. The electromagnetic torque is increased for about 16% however the rotor losses are reduced more than 50%. Therefore, considering the torque density and the efficiency of the new machine design, a reduction up to 20% in the material amount (rear earth magnets, copper, core) and in the machine volume and mass is possible compared with the conventional design. Thus, the application of presented new machine design for different industry applications would bring enormous economic and ecological benefits for the industry and the environment.
Low costs and high-efficiency electric machines
2012
7 Seiten, 10 Bilder, 1 Tabelle, 20 Quellen
Conference paper
English
Low costs and high-efficiency electric machines
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