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 Index Terms-Torque, finite element method, permanent magnet machines.
The purpose of the paper is to analyze the possibility to use a magnetic coupler instead of lever actuated friction clutch, which is used in the wind plants between the shaft from turbine and the shaft from motor. There are analysed the construction parameters of magnetic coupler to obtain the necessary coupler's mechanical torque. The paper includes the calculation of a mechanical torque, applying program QuickField. In QuickField there is calculated magnetic field using finite element method (FEM).
The authors present the results of tooth zone optimization for a double-fed induction generator able to operate at a low speed. The generator has a large number of pole pairs, all the windings are placed on the stator, with a winding-less toothed rotor. The optimization concerns the geometry of the tooth zone and is achieved by making the pole extension of trapezoidal shape instead of circular, which allows a 4% increase in the generated power.
-This paper posses the construction of induction generator, which has the ability to operate at a low rotation speed. This generator can be applied for directly driven turbine without using the gearbox. The generator is multi pole with all of the windings placed on the stator. Rotor is tooth-like and has no windings on it. Primary winding is three phase, secondary winding is two phase.
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