Abstract
In this study, 5.5-kW 1500 rpm IEC-60034-30-1:2014-IE4 super premium efficiency class Line Start Permanent Magnet Synchronous Motor (LS-PMSM) was presented with an innovative rotor design utilizing two different slot types have been used. The slots offered in two different geometries make a significant contribution to the motor in the form of a high starting torque thus increasing the synchronization ability. The prototype was manufactured for the optimal model obtained via analytical methods and Finite Element Software. Torque ripples that pose an important issue for permanent magnet motors were tried to be reduced by way of a skewed stator structure. In addition, motor frame and stator main dimensions were acquired from a standard IE2 induction motor design during the manufacturing of the prototype. Experimental studies for the suggested LS-PMSM topology put forth a 6 % higher efficiency in comparison with low efficiency IE2 standard induction motors with the same shaft power. Results for the starting performance, torque ripples and back-EMF were presented for the prototype motor under a constant load of 0-1.25 p.u. It was verified as a result of the study that LS-PMSMs can be used as an alternative to induction motors in pump and fan industrial applications.
Highlights
Testing the performance of electrical motors and determining their efficiency are quite sensitive issues
A total of 16 NEMA D class slots with high performance at motor start were placed on the sides of the PM taking into consideration the Line Start Permanent Magnet Synchronous Motor (LS-PMSM) speeding characteristic of the rotor taken as JOURNAL OF MECHATRONICS AND ARTIFICIAL INTELLIGENCE IN ENGINEERING
LS-PMSMs have to overcome the braking torque generated by the PMs in the rotor in addition to the motor load torque and motor inertia
Summary
Testing the performance of electrical motors and determining their efficiency are quite sensitive issues. The first LS-PMSM design was suggested in 1955 by Merril under the name of Permasyn motor [2] Researchers such as Dougles, Cahill and Adkins, and Yates carried out studies in later years suggesting different topologies. Previous research on LS-PMSM increased following studies by Binns but have not reached the desired level due to the high cost related with high-performance PMs [7,8]. Such PMs can be marketed at reasonable costs with today’s technology. The suggested design was prototyped in the present study [12] and performance assessment was carried out in accordance with IEC 60034-2-1 standard. Direct measurement method defined as Method A in IEC 60034-30-2-1 was used for determining motor efficiency [13]
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