DETERMINATION OF IRON AND STRAY LOAD LOSSES IN INDUCTION-MOTORS USINGA THERMOMETRIC METHOD

In an induction motor, losses in the magnetic materials account for 10 % to 20% of total losses. The iron loss effectively reduces both the o utput capability and possibly the life span of the machine. To limit t hese undesirable effects a prior requirement is to accurately assess t he iron losses, and understand their nature and, ideally, their spatia l location. An experimental method for determining the iron and stray load losses is presented. The test motor is a 3 phase, 4 pole: 4 KW in duction motor which was heavily instrumented with thermocouples to map the loss distribution.