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The impact of squirrel-cage material on steady-state and dynamic performance of induction motors and line-start interior permanent magnet synchronous motors is evaluated based on experimental data. The performance of motors with equal squirrel-cages manufactured from aluminium and silumin is analyzed and discussed, thus an integral analysis of similarities and differences between both motor types in relation to the squirrel-cage material is performed. Source


Hadziselimovic M.,University of Maribor | Marcic T.,Research and Development Center for Electrical Machines | Stumberger B.,University of Maribor | Zagradisnik I.,University of Maribor
Przeglad Elektrotechniczny | Year: 2011

The article presents an analysis of the winding type influence on the efficiency of an induction motor. The aim of this work is to choose such a type of stator winding that the induction motor will have the best efficiency by employing minimum winding (copper) mass. Three types of stator windings were considered in the analysis: concentric single layer winding, concentric double layer winding and fractional concentric winding. The complete procedure for the calculation of winding data is performed. The analytical calculations of electromagnetic characteristics were performed with the software package emLook in order to select the best suited winding type and consequently ensuring the best efficiency and performance of the induction motor in question. The presented results are applicable for the industry of electric machines. Source


In the presented study, the influence of the split ratio in 12 slot-14 pole permanent magnet motor with interior rotor on the efficiency and torque capability over a wide-speed range is presented. Results for two motors with the same outer stator diameter and different split ratio are presented in order to demonstrate the influence of split ratio on the motor efficiency and torque capability. Source


Stumberger B.,University of Maribor | Marcic T.,Research and Development Center for Electrical Machines | Hadziselimovic M.,University of Maribor
IEEE Transactions on Industry Applications | Year: 2012

Motors in semi-hermetic compressor drives are mostly fed from line. Because of good cooling conditions, the motors are heavily loaded and employ a specific rotor structure with 'C' bore. In the field of semi-hermetic drives, the use of induction motors (IMs) is still dominant, although different motor types with line-starting capabilities, as for example line-start interior permanent magnet synchronous motors (LSIPMSMs), can be used. This work presents the direct performance comparison of a family of commercially available three-phase four-pole IMs for semi-hermetic compressor drives with the equal size prototypes of LSIPMSMs. The motors were rated as 1, 2.5, 3.8, 5.5, 7.5, and 20 hp. The presence of 'C' bore in rotor structure can degrade LSIPMSM steady-state performance; therefore, the LSIPMSM designs steady-state performances are evaluated by FEA as well by the experimental method. The motors' dynamic performance is experimentally evaluated as well. The ultimate goal of this study is to reveal the improvement of LSIPMSMs characteristics in comparison to IMs characteristics and to check the possibility for the immediate replacement of existent IMs with LSIPMSMs in the target semi-hermetic compressor application. © 1972-2012 IEEE. Source


Marcic T.,Research and Development Center for Electrical Machines | Stumberger B.,University of Maribor | Stumberger G.,University of Maribor
IEEE Transactions on Industry Applications | Year: 2012

This paper presents an in-depth comparative analysis of the variable speed drive (VSD) performance between an IEC frame size 90 four-pole three-phase induction motor (IM) and the equal line-start interior permanent magnet synchronous motor (LSIPMSM). Employing measurement data from no-load tests, load tests, and temperature-rise tests of the aforementioned motors and different cage materials as well, the motors' no-load and load characteristics are first examined in detail and then the drives' characteristics are analyzed in open-loop volts per hertz (V/f) control by using the same voltage-source inverter and the aforementioned IM or LSIPMSM in both constant torque and constant power operation. It has been established that particularly the motors' current and power factor characteristics have distinct impact on the consequent VSD performance in terms of loss and efficiency. Furthermore, it has been shown that the lower loss of the LSIPMSM enables a significant increase of the VSD's constant power range. © 1972-2012 IEEE. Source

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