Determination of Iron Loss Distribution in Inverter Fed Induction Motors

Abstract

An approach based on the temperature-time method was used to investigate the iron loss density distribution in a 4 kW, 415V, 3-phase, 4-pole induction motor under both sinusoidal and inverter fed conditions. A test rig was constructed to allow loss densities to be evaluated at discrete points within the machine. A model based on interpolate functions was constructed to give the full loss density distribution throughout the stator iron. It is shown that iron losses increase considerably towards the ends of the stator core stack, particularly for theinverter fed case. The results are verified with those obtained from established models based on an equivalent circuit representations.

Localised losses in stator laminations of an induction motor under PWM excitation

“…In these investigations, the Epstein square has primarily been used for assessing a magnetic material under PWM or similar voltage excitations. However, a small number of theoretical and experimental works have been reported on loss distribution in induction motor stator laminations under sinusoidal and PWM voltage excitation [4,5]. However, localised flux density and loss distributions under PWM voltage excitation in stator core laminations have * Corresponding author.…”