Yazar "Aydemir, Mehmet Timur" seçeneğine göre listele

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  • Küçük Resim Yok
    Öğe
    A Hybrid-Excited Axial Transverse Flux Permanent Magnet Generator
    (Ieee, 2016) Aydın, Emrullah; Kim, Ju Hyung; Yıldırız, Emin; Aydemir, Mehmet Timur; Sarlıoğlu, Bülent
    This paper proposes a modular hybrid-excited axial transverse flux permanent magnet machine. The operational principles and performance characterization are presented. The toroidal excitation windings are placed on both teeth of the U-type core and are excited by a field current. The field current can either buck or boost the magnetic flux produced by the circular permanent magnets on the rotor disk. The finite element analysis is performed to quantify the change in flux linkage, back-EMF, and output power as a function of field current. This research contributes to the field weakening or intensifying feature of the axial transverse flux PM machine.
  • Küçük Resim
    Öğe
    Isolated High Step-Up DC-DC Converter With Low Voltage Stress
    (Ieee-Inst Electrical Electronics Engineers Inc, 2014) Evran, Fatih; Aydemir, Mehmet Timur
    Fuel cell stacks and photovoltaic panels generate rather low dc voltages and these voltages need to be boosted before converted to ac voltage. Therefore, high step-up ratio dc-dc converters are preferred in renewable energy systems. A new Z-source-based topology that can boost the input voltage to desired levels with low duty ratios is proposed in this paper. The topology utilizes coupled inductor. The leakage inductance energy can efficiently be discharged. Since the device stresses are low in this topology, low-voltage MOSFETs with small RDS (on) values can be selected to reduce the conduction loss. These features improve the converter efficiency. Also, the converter has a galvanic isolation between source and load. The operating principles and steady-state analysis of continuous and discontinuous conduction modes are discussed in detail. Finally, experimental results are given for a prototype converter that converts 25 V dc to 400 V dc at various power levels with over 90% efficiency to verify the effectiveness of the theoretical analysis.