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Due to the harmonic content of the distorted supply voltage, the iron losses of PWM inverter fed induction motors are greater than the iron losses measured with sinusoidal supply. The prediction of this loss increase has been the subject of many studies, but it can be still considered as an open research field, in particular when fast and reliable estimation methods are requested. In the paper a previously...
In the paper the no-load operations of PWM inverter fed induction motors are discussed and analyzed, with particular reference to the core and additional losses in presence of a distorted voltage supply. Starting from a previously developed method to predict the iron losses with PWM supply in magnetic laminations and special induction prototypes, the authors want to introduce the problems concerning...
This paper presents an investigation into the impact that PWM harmonics have on iron losses in an induction motor. In order to isolate the effect on iron losses, a special test motor is used, with a plastic rotor cage. The special motor is operated at standstill and input power is measured and allocated as stator copper loss or iron loss. Using sinusoidal and PWM supply conditions, the influence of...
In induction motors with closed rotor slots the enclosure upper part of the rotor slot saturates during the machine operations, involving an additional non-linearity in the machines behavior. A simple locked rotor test gives prominence to this phenomenon. In fact, in this test the supply voltage versus adsorbed current characteristics are not linear. In the paper a single-phase induction motor equivalent...
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