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