4 research outputs found
Comparison of Average Current Controlled PFC SEPIC and CUK Converter Feeding Current Controlled SRM
In this paper, current control of 6/4 switched reluctance motor (SRM) fed by both power factor correction (PFC) SEPIC and CUK converter is realised and asymmetric bridge converter is used to drive SRM. Furthermore, SEPIC and CUK DC-DC converters are connected in series to diode bridge rectifier in order to build PFC converters. Average current control of PFC converters is carried out by PI algorithm and both converters are operated at continuous conduction mode (CCM). Besides, switching frequency of PFC and asymmetric bridge converters is 62, 9 kHz with 5750 W power. Studies are conducted by using MATLAB/Simulink software. Total harmonic distortions (THD)s of grid current, grid power factor (PF) and output voltages of the converters are compared. Also, THDs of grid current of each converter are compared by IEEE 519-2014 standard. In addition, current waveform and flux of SRM phases are shown. It is validated by simulations that PFC CUK converter gives better result with 9.08% THD, 0.998 PF than PFC SEPIC converter having 9.61% THD and 0.997 PF. Furthermore, both converters provide the limit defined by standards
Internet based wıreless data communıcatıon ın ındustrıal automatıon
Endüstriyel uygulamalarda kontrol sistemlerinin ağ gereksinimleri günden güne artmaktadır. Bu gereksinimleri gidermek için internet tabanlı kontrol ve çeşitli sahayolu sistemleri tasarlanmaktadır. Haberleşme sistemlerinin tasarımları yapılırken sistemin genişleyeceği göz önünde bulundurulmalıdır. Bu
çalışmada, sistemlerin ihtiyaçlarını karşılayabilecek kablolu/kablosuz melez sistem denilen yeni bir haberleşme yapısıyla internet destekli kontrol sistemi,
alan seviyesinde düzenlenmekte ve uygulanmaktadır. Sistem, bir programlanabilir denetleyici (PLC), bir haberleşme işlemci modülü (CP), iki endüstriyel kablosuz modülü (IWLAN), bir dağıtılmış giriş/çıkış modülü ve motor koruma paketiyle (MKP) tamamlanmaktadır. Dağıtılmış tüm giriş ve çıkışların görevlendirilmesi ve test edilmesi kablolu/kablosuz haberleşme yoluyla gerçekleştirilmektedir. Düzenlenen sistemin amacı Profinet ağ yapısının daha hızlı olan veri transfer özelliğini kullanarak imkânları zorlayan olumsuz ortama kullanışlı ve daha ucuz çözümler getirmek ve de dağıtık mimari için uygun maliyetli, esnek, ayarlanabilir ve güvenilir sistemler sağlamak için yeni fırsatlar sunmaktır.The network requirements of the control systems in the industrial applications increase day by day. The internet based control system and various fieldbus
systems have been designed in order to resolve these requirements. While the designs of the communication systems are prepared, it should be kept in mind
that the system will expand in future. In this paper, internet based control system that will be able to meet the system requirements with a novel communication structure is called wired/wireless hybrid system has been designed on field level and carried out. The system has been accomplished with
a programmable logic controller (PLC), a communication processor (CP) module, two industrial wireless (IWLAN) modules, and a distributed I/O module and Motor Protection Package. Commissioning and testing of all
distributed I/O has been implemented via wired/wireless communication. The aim of the designed system is to provide convenient and cheaper solution in
harsh environment by using higher speed data transfer feature of the Profinet network structure, and also to offer a new opportunity to realize cost-effective,
flexible, scalable and reliable systems for distributed architectures
Stator Configuration for Cogging Torque Minimization of Surface Mounted Permanent Magnet Synchronous Generators
In this study, we present the structural changes in the stator core to reduce the cogging torque in a surface-mounted permanent magnet synchronous generators. The effect of these structural changes on cogging torque and generator performance has been investigated, 2D-3D finite element analysis (FEA) and analytical results have been given comparatively. The magnetic equivalent circuit and the relative permeability models have been used to obtain the airgap flux density required for the calculation of cogging torque. Airgap and magnetic field in the magnet area have been firstly calculated as slotless effect and then re-expressed taking into account a relative permeability function (correction factor) obtained by appropriately adding slots. A 4-
kW, 24-pole, 72-slot radial-flux machine has been designed and optimized to implement the proposed structural change and analytical method
Optimal Design and Verification of a PM Synchronous Generator For Wind Turbines
This study reports the analytical computation including performance characteristics under no-load condition in combination with coupled 2D electromagnetic field-circuit analysis of a 4kW direct drive permanent magnet synchronous generator (PMSG) to be used in micro-scale wind turbine applications. The specifications such like stack length, skew and magnet offset of PMSG are optimized by using parametric approach including multi-objective design optimization. It describes the methodology to gain required output performance such as output power, load voltage and maximum efficiency of the wind generator. Based on the optimized design, the model has been exposed to some transient coupled-field circuit analyses based on variable wind flow speed under no-load conditions. In addition to these evaluations; the experimental results verified the effectiveness of the employed simulations model related to finite element methods and analytical studies showing that that the induced voltage at nominal speed and no-load condition is at desired level and results obtained under no-load condition are in good agreement with the analysis and analytical results