Browsing by Author "Ocak C."

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Investigation of the effect of magnet thickness on output power and torque of PM BLDC machines using parametric approach method
(2011-12-12) Bayindir R.; Ocak C.; Topaloǧlu I.
The main purpose of this paper is to describe the effect of magnet thickness on output power and torque of a 500 Watts PM BLDC motor using parametric approach method to reduce the amount of magnet material. Because the cost of magnet material is high compared with the cost of the other materials used in electric motors, required amount of magnet material are important considerations in motor selection. In the approach, the motor specifications, numerical optimization technique and solution method are effectively introduced. Additionally, the proposed approach provides the effective information to electrical machine designers. Finally, effects of magnet thickness to output parameters simulated and graphically represented. The proposed machine has 24 slot, 4 pole (surface mounted) and inner runner configuration. © 2011 IEEE.
Transient analysis with coupled field-circuit model and experimental assessment of a PMSG used in small-scale wind turbine for water heating purpose
(2019-12-01) Cetinceviz Y.; Sehirli E.; Uygun D.; Ocak C.; Demirel H.
This paper introduces the detailed coupled field-circuit analysis including performance characteristics of a 4-kW in-running rotor permanent magnet synchronous generator (PMSG) used in rural-type small-scale wind turbines for water heating purpose. The content of the work consists of design, analysis, optimization, production and testing processes and validation studies. An integrated 2D electromagnetic field and circuit model are used in the design and analysis processes. The electrical machine design involves complex and time-consuming processes. This model provides comprehensive information on machine behavior under different conditions and is an effective to demonstrate compliance with real load conditions prior to the manufacture. The goal of the optimization process is to find a design that offers cost, manufacturability and efficiency as well as generator output values. For this, a multiobjective optimization approach has been used. Typical design and simulation principles are applied to the designed PMSG, respectively, including calculation and evaluation of various output parameters for different simulated wind speed rates and varying load conditions. Furthermore, the analytical studies related to finite element methods and parametric approaches are presented in collaboration with experimental studies carried out for different load rates.