Abstract
The phenomenon of cogging torque in permanent magnet synchronous generators with concentrated windings is considered in this work. Dependence of fluctuation amplitude of the torque on width of stator slot opening is researched. The method to reduce the cogging torque by skewing of stator slot and opening of stator slot width equal distance between magnet and tooth on the rotor is described. The construction of this generator is obtained on the basis of numerical simulation results.DOI: http://dx.doi.org/10.5755/j01.eee.19.1.3248
Highlights
Permanent magnet synchronous generators (PMSG) are used in low power wind turbines because of advantages of generators, such as high efficiency, simplicity and reliability of construction
Curves of the cogging torque for two cases are presented in Fig. 6: case of equality and case of different values of slot opening width and interpolar distance
Further we will consider possibilities to reduce pulsations of cogging torque by skewing of stator slots, if slot opening width is equal to interpolar distance (
Summary
Permanent magnet synchronous generators (PMSG) are used in low power wind turbines because of advantages of generators, such as high efficiency, simplicity and reliability of construction. Cogging torque is expressed in change of the torque on rotor in interaction of magnet flux and stator teeth. Magnets form poles of one polarity, and teeth form poles of opposite polarity, but with the same nominal flux (Fig. 2). This construction of generator allows to reduce costs of production and to simplify connection of magnets on the rotor. The advantage of this method: it allows solving problems in complicated geometry of tooth zone, taking into account non-linearity of environments
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