Measurement of hysteresis loop at the tip of the teeth of an inverter-driven squirrel-cage induction motor

This study presents measurements of magnetic flux and hysteresis loops in a squirrel-cage induction motor using search coils located on the tip of the teeth. Results show maximum magnetic flux near the teeth which is decreased when the motor has the rated load. This is due to armature reaction caused by the current in the rotor conductor. Hysteresis loop results indicate that the iron loss beneath the teeth increases when the motor has a load.