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In order to reduce energy cost, the use of renewable energy sources have been attracted worldwide. Therefore, wind energy conversion systems (WECS) have gained importance among renewable energy methods. Permanent magnet synchronous generators (PMSG) are widely used in wind power system in order to generated electrical power from low speed of wind and can be operated in the variable wind speed. Variation...
The permanent magnet synchronous generator (PMSG) is widely used in wind power generation due to its high energy efficiency and controllability. Unbalance load conditions or different load conditions effects PMSG operation system. Furthermore, these conditions occur in problematic operation and distorted converter currents. The operation condition of the PMSG system to the effects of variation load...
Travelling wave ultrasonic motors (TWUSM) experiences a growing interest due to features such as the high holding torque, high torque at low speeds and quiet operation for industrial applications. The speed control of TWUSM is carried out using techniques based on changing the frequency, amplitude and phase difference of the applied voltage. The dynamic speed characteristics of TWUSM vary depending...
Due to the rapid development of technology, the new applications are occurring into presence which request high efficient speed control and high efficient position control. So, travelling wave ultrasonic motors (TWUSM) have been drawn attention as important actuators for position control and speed control applications of late years. The relationship between rotor speed and different load behaviours...
The relation between rotor speed of the Travelling wave ultrasonic motor (TWUSM) and current drawn by TWUSM is not linear for the TWUSM under different loads. In order to solve this nonlinearities and variation problems of TWUSM, PI controller, current controller, frequency controller and phase difference controller are proposed and implemented. The proposed system evaluates the steady-state performance...
Travelling wave ultrasonic motors (TWUSM) are recently being used in industrial applications. The rotor velocity of TWUSM is controlled by three quantities. These are amplitude, the phase difference and frequency of applied voltages. In this study, in order to investigate the speed response of a travelling wave ultrasonic motor under dual-mode operation, a micro controller based digitally controlled...
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