M.Sc. Tezi Görüntüleme

      In this study, the speed control methods for the slip-ring induction motors over the rings have been researched. The effects of the voltage applied the rotor windings on the instantaneous stator and rotor current waveforms and transient torque dynamics have been examined. The negative and dangerous effects of the voltage injection method are tried to reduce by the adaptive fuzzy logic based speed control system.

      For the experimental studies, 100A 1200V IGBT inverter is realized and TMS320F2812 Digital Signal Processor is used together with space vector pulse width modulation in order to control of magnitude and frequency of the injected voltage. The useful informations are given about the programming of the new family digital signal processor TMS320F812.

      The power flow between rotor windings and supply is analyzed and presented according to the different operation regions of the machine. A large range speed control system, which has the lost power recovery drive, is implemented under the negative or unexpected load torque that changes suddenly and regenerative braking region. The experimental results are compared with the computer simulations.

      It is determined that the proposed method can be used in which operation conditions according to the mechanical and physical restrictions of the system. Especially, the effects of the voltage injection are also discussed in conditions with super synchronous motor and around the synchronous speed.

      In the last chapter, the control system performance is analyzed with computer simulations on the four-quadrant of the slip-ring induction motor in case voltage having slip frequency, which is applied to rotor windings with adaptive fuzzy logic based control system, is exactly filtered sinus. The effects of voltages having exact sinus waveform and slip frequency are discussed with applications which are made with non-filtered inverter output voltages.

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