Comparison of electromechanical characteristics of three phase induction motors with different pole and slot number combinations

Article type: Research Article

Authors: Marčič, Tine^{a; *} | Štumberger, Bojan^{a; b} | Štumberger, Gorazd^{a; b} | Hadiselimović, Miralem^{a; b} | Zagradišnik, Ivan^{a; b}

Affiliations: [a] TECES, Research and Development Centre for Electrical Machines, Maribor, Slovenia | [b] University of Maribor, Faculty of Electrical Engineering and Computer Science, Maribor, Slovenia

Correspondence: [*] Corresponding author: Tine Marčič, TECES, Pobreška cesta 20, SI-2000 Maribor, Slovenia. Tel.: +386 2 333 1354; Fax: +386 2 333 1351; E-mail: [email protected]

Abstract: The comparison of electromechanical characteristics of a 4-pole and a 6-pole induction motor with 36 stator slots in combination with 28, 33, 34, 44 and 46 rotor slots is presented. A comparative analysis is performed by evaluating: the iron losses at no-load, the shapes of torque-slip curves, the shapes of torque per unit current vs. slip curves, and the efficiencies and over-temperatures in thermal equilibrium at rated load. The paper evidently shows that motors which exhibited low values of iron losses at no-load also exhibited superior line-starting performance, high values of torque per unit stator current and superior efficiency at rated load. Moreover, the paper shows the feasibility of using the same stator and rotor slot combination for a mid-size 4-pole and 6-pole induction motor.

Keywords: Induction motors, drives, stator and rotor slot combinations, electromechanical characteristics, measurements

DOI: 10.3233/JAE-2009-1053

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 31, no. 3, pp. 161-169, 2009