EFFECTS OF SLOT CLOSURE AND MAGNETIC SATURATION ON INDUCTION MACHINE BEHAVIOR

Reduction of the permeance variations due to slot openings can be achi eved through the use of closed or semi-closed slots or magnetic slot w edges. A complete transient finite element model analyzes the effects of slot closure in an induction motor. The analysis of the air gap flu x density and magnetic force waves determined by the finite element mo del reveals two effects of stator slot closure: (a) a reduction Of tho se flux density and force waves generated by stator slotting, which wa s expected, and (b) an increase in the amplitude of the flux density a nd force waves originating from saturation.