A New Method for minimizing the Cogging Torque of Permanent Magnet Machine of Integral Slot Number for the Renewable Energy Plants Application.

Abstract

This paper proposes a new method how to minimizing the Cogging Torque by employing the slotting method of Two Steps of Slotting (TSS) in the magnet edge of the Permanent Magnet Machine (PMM). Also, the influence of a magnet pole cross-section area and the slot opening width on the cogging torque reduction for the PMM was investigated. The proposed machine has 6 poles and 48 slots with fixed slot opening width and modified magnet pole in the rotor. The software used to investigate and analyzed the core saturation induced in the stator and rotor of the PMM is the finite element method magnetics (FEMM 4.2), While for the magnet edge structure using the response surface method. The Simulation of the optimization results showed that the cogging torque of PMM with TSS in the magnet edge can minimize the Cogging Torque significantly. By applying the Numerical Computation based on the FEMM, it is found that the reduction of the cogging torque of the proposed one is 98.78%. With the low cogging torque and the high-speed of PMM, it might be used for the reference for the design and construction of the PMM for renewable energy plants as for the Geothermal  plant