کنفرانس مهندسی برق ایران

صفحه اصلی / سی و چهارمین کنفرانس بین المللی مهندسی برق

Experimental Evaluation of the Impact of Magnetic Slot Wedges on Losses and Temperature Rise in a 250-kW, 6.6-kV TEFC Induction Motor

نویسندگان :

Mina Mohammadi Dogaheh¹ Esmaeil Keyvanloo Shahrestanaki² Amir Rashidi³

1- دانشکده برق و کامپیوتر، دانشگاه صنعتی اصفهان 2- دانشگاه صنعتی شاهرود 3- دانشگاه حکیم سبزواری

کلمات کلیدی :

Induction motor،medium-voltage،magnetic slot wedge،TEFC

چکیده :

This paper presents an industrial-scale experimental and numerical investigation on the effect of magnetic slot wedges (MSWs) on the electromagnetic and thermal performance of a 250 kW, 6.6 kV, totally enclosed fan-cooled (TEFC) induction motor. A two-dimensional finite element (FEM) model was developed in ANSYS Maxwell to evaluate the impact of MSWs on air-gap flux distribution, harmonic content, and iron-loss reduction. The simulation results were validated by full-load type testing according to IEC 60034-2-1, Method 2-1-1B, and subsequently used as input data for a three-dimensional Lumped-Parameter Thermal Network (LPTN) model to predict the motor’s temperature field. The results show that applying MSWs with a relative permeability of 2.5 and 3.5mm thickness significantly smooths the air-gap flux waveform, reducing the total harmonic distortion (THD) of the radial flux density by 25% and the overall core losses by about 55%, while the winding temperature under rated load decreases by over 20 °C. The calibrated LPTN model closely agrees with experimental measurements, showing less than 2 °C deviation in steady-state temperature. The combined experimental and simulation results demonstrate that the use of magnetic slot wedges provides a practical, cost-effective, and industrially feasible approach to reducing iron losses, improving efficiency, and enhancing the thermal reliability of medium-voltage TEFC induction motors.