Influence of rotor slot number on rotor bar current waveform and performance in induction machines

Optimal Selection of Rotor Bar Number for Minimizing Torque and Current Pulsations Due to Rotor Slot Harmonics in Three-Phase Cage Induction Motors

“…By comparing Table XIV with a similar table given in [5] and reproduced here for convenience (Table XV; skewed rotor bars only), it can be concluded that some of the numbers of rotor bars identified in this paper can be found in [3] but most of them do not appear in Table XV. Table XV from [3] also gives some odd numbers of rotor bars as preferred.…”

“…The influence of rotor bar number on the rotor bar current waveform and other key performance aspects, including rotor cage copper loss, rotor bar current density, average torque, torque ripple, efficiency, etc., has been investigated in detail in [3]. Further, it has been shown that the magnetic saturation of rotor teeth, causing a significant increase in the rotor slot leakage flux, plays a key role in determining the rotor bar current distortion [4].…”

Influence of stator and rotor geometric parameters on rotor bar current waveform and performance of IMs

“…16 a ), the rotor bar current waveform becomes non‐sinusoidal for the values of h r 1 lower than 30 mm (see Fig. 16 b ) since the third harmonic, which is responsible for the flat‐topped curves as explained in [5–8], reduces sharply. As illustrated in Fig.…”

“…Nevertheless, it has been revealed that the bar currents can be non‐sinusoidal under a very low slip rate or excessively high electrical loading operations [4] or in the IMs whose air‐gap length is remarkably short [5]. It has also been shown that the bar current distortion level and the electromagnetic performance of the conventional squirrel‐cage IM deeply depend on the stator slot/pole number combinations [6] and the number of rotor slot [7]. Furthermore, the reason behind the non‐sinusoidal bar current phenomenon is investigated in depth, and it is concluded that due to the heavily saturated rotor tooth parts, the bar currents become non‐sinusoidal [8].…”

Analysis of coil pitch in induction machines for electric vehicle applications

“…6. Note that the rotor slot numbers have been determined empirically by using the rules presented in [48]. During the design stage, the same stator outer diameter and stack length have been assigned for all the IMs.…”