Analysis of 37-kW Converter-Fed Induction Motor Losses

Abstract

Abstract-This paper presents an energy efficiency analysis of a 37 kW standard squirrel-cage induction motor under sinusoidal and non-sinusoidal supply. The motor losses are analyzed using the conventional IEC loss segregation method and also numerically modeled using finite element simulations. The measured and simulated loss components are compared with three different modulation methods. The overall simulated losses are in good agreement with the measured ones, but there exist differences in the loss components.

Iron Loss Minimization Strategy for Predictive Torque Control of Induction Motor

“…Induction motor losses are usually divided into five categories: stator winding losses, rotor winding losses, iron losses, mechanical losses, and additional losses [1,2]. In this paper, iron losses were of interest.…”

“…Mechanical losses are usually calculated from four or more constant loss points between 30% and 60% of the rated motor voltage by developing a curve against no-load voltage squared and then performing linear extrapolation to zero voltage [1,2]. The intersection of the extrapolation curve with the vertical axis then corresponds to the mechanical losses.…”

“…The intersection of the extrapolation curve with the vertical axis then corresponds to the mechanical losses. However, mechanical losses are speed and temperature-dependent [2]. Therefore, to obtain the dependence of the losses on speed, several tests with a variable harmonic supply voltage created by an SG were performed.…”

“…Since electric motors consume a considerable part of the world's electric energy, energy savings of electric motor drives are a hot topic amongst researchers. Using a voltage-source inverter (VSI) as a power supply for the induction motor (IM) drive introduces additional losses compared to a sinusoidal supply [1,2] since the total harmonic distortion (THD) of the motor supply voltage directly contributes to the loss increase [3].…”

Induction cage machine thermal transients under lowered voltage quality

“…The effect of lowered voltage quality on induction machines is the subject of numerous research works. For the most part, these works are focused on power losses, efficiency issues [15][16][17][18][19][20][21][22][23][24][25], torque and vibration [19,22,26,27], load-carrying capacity [4,12,14,16,20,21,23,28,29], and thermal loads [4, 5, 12-15, 17, 18, 21, 24, 27, 28, 30-35]. It should be stressed that the vast majority of the works are focused on thermal steady states.…”