Effect of stator slotting on the performance of sheet-rotor induction motors

A method is described which allows calculation of the torque developed by a sheet-rotor machine when account is taken of parasitic drag torques arising from the stator slotting. Equations are developed for an example winding by Fourier-analysing the airgap permeance function. These equations may be solved digitially using a standard algorithm. Experimental data are included from sheet-rotor machines in support of the theory.