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