Effect of stator slots and poles on the design of rotating machine

Unsuitable combinations of stator and rotor slots with unsuitable number of poles generate high level of harmonic content and malfunctions of rotating machine when set into running operation. If this situation is not arrested, this could lead to the entire breakdown of machine. In rotating machine design, the stator slots must be able to run effectively with the suitable number of rotor slots so as to avoid cogging and winding vibrations. The manufacturer needs to know the level of harmonic contents of that machine to be wound in order to run a particular load. The rewinder should not rewind a stator with pole that will bring abnormal operation of that machine by considering the suitable stator slots and poles that will prevent the coil from undergoing heating effect. The winding may be symmetrical, unsymmetrical, balanced or unbalanced and these depend on the number of stator slots and the number of poles. This paper presents the effect of harmonic contents on the number of stator slots and poles of rotating machines.