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    Design Considerations on E-core for Modular and Scalable Permanent Magnet Synchronous Machine
    (Ieee, 2020) Ayaz, Murat; Bakbak, Ali; Canseven, Huseyin Tayyer; Altintas, Mert; Mese, Erkan; Akin, Ozkan; Boztepe, Mutlu
    In electrical machines, the modularity by making the stator in multiple parts brings many advantages. The ability to create machines of different power using the same E-cores,to be scalable, is very important in terms of production and transportation costs. In this study, E-core design for a modular and scalable PMSG is discussed. E-core dimensions are determined by considering magnetic and electrical loading, magnetic coupling, torque ripple, cogging torque, voltage harmonics, etc. apart from enabling the creation of different slot/pole combinations. Core and magnet sizes are determined analytically and FEM analysis of two selected models have been performed. Prototypes of machines with slot/pole combinations of 24/22 and 48/46 and rated power of 2.5kW and 5kW respectively have been manufactured with the same E-cores.
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    Determination and Functional Implementation of Operating Point of a Centrifugal Pump With BLDC Motor
    (Ieee Canada, 2022) Tarhan, Umit; Selim, Erman; Akin, Ozkan
    In the present study, a sensorless method is proposed to determine the operating point on pump curves in a BLDC-driven centrifugal pump, and certain functional implementations of the operating point are investigated. To develop a sensorless system, a calibration method is defined for the setup time. System variables such as head, flow, and power are determined at runtime based on the calibration data and the control algorithm of the BLDC motor. Thus, beneficial improvements are achieved for centrifugal pump systems, since only motor phase current sensors are required at runtime. These parameters are used to force the system into various modes such as minimum energy, maximum efficiency, or fastest, which could be selected by the user. The experimental results for an open-loop pump system setup as a part of the experiment are presented.
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    Face Recognition Based Multifunction Smart Mailbox
    (Ieee, 2020) Sokullu, Radosveta; Akin, Ozkan; Aslan, Erginay
    The abundance and variety of the Internet of Things (IoT) applications in the recent couple of years has reach a new record. From smart home, smart traffic, smart city, to industry, logistics and agriculture IoT applications are penetrating in every facet of our life and our society. A lot of simple and more complicated solutions benefit from the flexibility and diversity of connections that this new technology provides. In order to provide better management, better visualization, increase scale and reduce response times logistics and warehouse management are embracing new ways to improve upon the already old RFID technology. In this sense IoT provides an unprecedented technology to meet all these requirements in a uniform and easy to manage way. In this work a specific smart application - IoT mailbox with face recognition is discussed. Combining cellular connectivity with image processing it ensures the user that his valuable documents will be securely delivered. The developed prototype consists of a fingerprint reader, a camera, electromagnetic lock, a small LCD screen, a microphone and a loudspeaker all connected to an Arduino Uno which processes the data and establishes the network connectivity through a GSM module. Additionally, to perform face detection and recognition based on a prerecorded image set the camera is connected to Raspberry Pi and OpenCV and Python software is employed. The remotely controlled electromagnetic lock ensures that shipments are kept protected until the designated receiver takes possession of them.
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    PMSG-Based Dual-Port Wind-Energy Conversion System With Reduced Converter Size
    (Ieee-Inst Electrical Electronics Engineers Inc, 2021) Bakbak, Ali; Altintas, Mert; Ayaz, Murat; Canseven, Huseyin Tayyer; Boztepe, Mutlu; Akin, Ozkan; Mese, Erkan
    In this study, a dual-port wind-energy conversion system has been proposed. A double-fed permanent-magnet synchronous generator (DFPMSG) forms the central part of the system, where the concentrated single-layer winding configuration of the generator enables electric and magnetic isolation between the ports. DFPMSG has two three-phase terminals out of the stator; one is connected directly to the grid, whereas the other is tied to the grid through a back-to-back converter. This study investigates design issues caused by the DFPMSG port with a direct grid connection. The unique design issues of the proposed system include determining the slot/pole combination using wind data and determining the minimum reactive power requirement for the port with a direct grid connection. Next, the load-sharing capability among the ports of the proposed system is presented through a detailed investigation of three schemes. Experimental work is presented for a 5-kW prototype DFPMSG system to illustrate the isolation among the ports, minimized reactive power demand on the port with direct grid connection, and load-sharing ability among the ports for different control schemes.