Thesis Defense - Seyit Yıldırım (MSEE)

Seyit Yıldırım - M.Sc.Electrical and Electronics Engineering

Asst. Prof. Ahmet Tekin – Advisor

Date: 25.08.2020

Time: 10:00

Location: This meeting will be held ONLINE. Please send an e-mail to gizem.bakir@ozyegin.edu.tr  to participate in this defense.

A High Power Factor Flux-Weakening Strategy for PMSMs without Electrolytic Capacitors 

Thesis Committee:

Asst. Prof. Ahmet Tekin, Ozyegin University

Asst. Prof. Göktürk Poyrazoğlu, Özyeğin University

Prof. Musa Alcı, Ege University 

Abstract:

Nowadays, large electrolytic capacitors are being replaced with small film capacitors in single phase to three-phase motor drive inverters. The inverter is easy to control as the large electrolytic capacitor keeps the dc bus voltage almost constant. However, this particular electrolytic capacitor is expensive, large and it is the device with the shortest lifetime in the overall inverter system. Also, the use of electrolytic capacitors requires additional PFC circuit and pre-charging circuit. If a small film capacity is to be used instead, cost and overall size are reduced, and the product life time is increased significantly. However, in the case of smaller capacitors the dc-link voltage fluctuates at a rate twice of the source frequency and this in return causes control difficulties. In order to handle this issue, many methods have been proposed in the literature. This paper introduces a somehow different flux-weakening strategy to solve the mentioned problem. Also the proposed method provides power factor improvement and input current harmonic reduction in comparison to available traditional methods.

Short-Bio: 

Seyit Yıldırım received his BSc. Degree in Electrical and Electronics Engineering from Ege University in 2017. Upon graduation, he continued to MSc. at Özyeğin University and in his Master’s thesis, he is working under the supervision of Ahmet Tekin. He is currently working as an Motor Control Software Engineer at Vestel R&D Department. His research interests are motor control systems, software design and power electronics.

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Kişisel Verilerin Korunması/Aydınlatma Metni

Özyeğin Üniversitesi Fen Bilimleri Enstitüsü bünyesindeki programlarda, izleyici olarak katılınan online platformlarda gerçekleştirilen aleni akademik faaliyetlerin sadece idari ve yasal yükümlülüklerin yerine getirilmesi amacıyla kayıt altına alındığı, söz konusu kayıt ile elde edilen kişisel verilerin ilgililer tarafından başka bir amaçla kullanılamayacağı hususunda şahsınızı aydınlatır, toplantıya gönüllü katılım ile bu hususu beyan ve taahhüt etmiş olduğunuzu belirtir, gereğini önemle rica ederiz. 

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