, Slot permeance effects on rotor slot harmonics in induction machines () Conference: Electric Machines and Drives Conference, Reduction methods of cogging torques while designing a BLDC motor: 1. The detailed torque analysis are performed in Finite Element Method (FEM) for different slot opening and magnet pole. The torque harmonics generated by asynchronous machine slotting are essentially linked to air‐gap permeance variations due to the rotor rotation. The method uses an improved 2-D permeance model. [1] Nandi, S. Therefore, this wedges reduce the magnitude. Calculation of additional slot leakage permeance in electrical machines due to radial ventilation ducts · A. slot-openings are taken into account, is used. . Nandi, S. In order to evaluate the accuracy of this. permeance and the actual air gap permeance. Thicker tooth tips to. permeance functions. , Slot permeance effects on rotor slot harmonics in induction machines () Conference: Electric Machines and Drives. Conference, IEMDC. The soft ferrite magnetic wedges inserted into the stator slot openings reduce the ripple of air-gap permeance. · Localización: Compel: International. This paper presents a methodology for the analytical computation of the slot leakage inductance of tooth-coil winding permanent magnet synchronous machines. These. Demenko ; K. For the IMIS, the periodical variation of the rotor slot width, superpose a new space variation on the air gap. Larger number of slots/pole 3. Increase of air gap length 2.