IJE TRANSACTIONS B: Applications Vol. 32, No. 5 (May 2019) 693-700   

PDF URL: http://www.ije.ir/Vol32/No5/B/11-3072.pdf  
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M. Niaz Azari
( Received: February 21, 2019 – Accepted in Revised Form: April 05, 2019 )

Abstract    This paper analyzes an induction motor with high temperature superconducter (HTS) coated slotted solid rotor. By slotting the solid rotor, the electromagnetic torque near synchronous speed will increase but the starting torque will decrease. To improve starting torque, rotor slots are coated with HTS materials. Using HTS material vary the rotor resistance to great extends in starting step and this means the starting torque will be maximized. Also the torque near synchronous speed will be higher than before because of the resistance of the HTS is completely zero in this period. This would help the torque become more than the case without any coating. It is concluded that, HTS coating of slotted solid rotor will increase the starting torque by 42 and 74% than smooth type rotor and slotted one, respectively. For case-study motor, the torque near synchronous speed these improvements were 75% and 33%, respectively. The performance of the proposed motor is simulated using finite element method (FEM).


Keywords    Bi-2223/Ag Super Conductor; Critical Current; Slotted Solid Rotor; Starting Torque



در این مقاله به بررسی موتور القایی با روتور شیاردار پوشیده شده از ابررسانای HTS پرداخته می‌شود. با شیاردار کردن روتور گشتاور الکترومغناطیسی در نزدیک سرعت سنکرون افزایش می‌یابد ولی گشتاور راه‌اندازی کاهش می‌یابد. برای بهبود گشتاور راه‌اندازی شیارها با روکش ابررسانا پوشیده شده‌اند. این کار باعث افزایش مقاومت روتور می‌شود که موجب افزایش گشتاور راه‌اندازی خواهد شد. همچنین این پدیده موجب می‌شود گشتاور نزدیک سرعت سنکرون نیز افزایش‌یابد زیرا مقاومت روتور در این حالت تقریباً صفر می‌شود. با پوشش ابررسانای روتور، گشتاور راه‌اندازی برای موتور با روتور یکپارچه بدون شیار 42 درصد و برای روتور با شیار 74 درصد افزایش می‌یابد. همچنین گشتاور نزدیک سنکرون برای موتور با روتور یکپارچه بدون شیار 75 درصد و برای روتور با شیار 33 درصد برای موتور نمونه زیاد خواهد شد. عملکرد روش پیشنهادی با استفاده از روش اجزای محدود مورد شبیه‌سازی قرار گرفته است.


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