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