Investigation of current vector control of synchronous servo drives

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Dr. Veszprémi Károly
Department of Electric Power Engineering

Nowadays there are growing use of the electrical machines in the world. This is partly due to the cost of power electronic components in the development of electronics decreased significantly compared to the old days. On the other hand, thanks to technolog-ical development they can be relatively simple and effectively managed, controlled. In my thesis I examine the control of a permanent magnet cylindrical rotor sinusoi-dal field synchronous motor with simulations. The simulations were performed in Matlab Simulink. The first chapter is a general introduction about the importance of electrical ma-chines nowadays. In the second chapter I present the construction of a general controlled electric drive. Separately I present the components of drive and I review their operations. I de-scribe the models of components and that what kind of simplifications I used compared to the real items. In the third chapter I examine the so called PWM (Pulse Width Modulation) current vector control. Among this I deal with 3 phase PWM current vector control and space vector PWM current vector control. In the models I used PI controllers. In both cases I compare that there is a difference, if the current controllers regulate currents in different coordinate systems. First I review the theoretical operation of the regulation by each con-trol, than present the structure and operation of the created model. In the fourth chapter I deal with Hysteresis current vector control (known as bang-bang control). After presentation of the theoretical operation I demonstrate the construc-tion and operation of the created model. In the fifth chapter I compare the examined controls based on different aspect.


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