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