In the last decades piezoelectrically driven ultrasonic motors have become alternative actuators to the conventional electromagnetic motors especially for precise and accurate servo positioning applications. Different types of ultrasonic motors have been constructed and manufactured. Several drive systems have been designed, implemented and proposed for these motors. A variety of control techniques have been applied to them. The research given in this study covers bases of the ultrasonic motors. Theoretical background, modeling, drive systems, control techniques and applications of the ultrasonic motors have been introduced. Firstly, the general overview has been given. Then, modeling studies focused on performance estimation and analysis of ultrasonic motors have been examined. Afterwards, drive systems and control techniques of ultrasonic motors have been investigated. Furthermore, an example drive and control system has been presented. This drive system has been designed as to be controlled digitally. In addition, the important industrial and research applications of these motors have been included. The presented study has been arranged as a review of ultrasonic motors. The important points of specifications, models, drive systems and control methods of the ultrasonic motors have been emphasized.

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The global microgrid market is promptly flourishing as government and private sector willingly to support actively. Todays, many countries and government have encouraged installing renewable energy farms for example wind farms and solar farms etc., and huge research has started in various aspect of it at the university level. The energy market in the United States is the largest market which has already taken a clear lead and they have mainly focused on remote microgrid and military microgrid. In European Union region, microgrids have reached in mature technology to participate in utility grid. However, in Asia-Pacific and Far East region has huge potential to grow up renewable energy market in future due to emerging economies to overcome power shortages/power outages and low grid connectivity. This paper presents several distributed generation around the European Union region and we have tabled testbeds microgrid and insight perceiving the possible evolvement of future grid. The study has concluded emphasizing the remarkable findings and potential research areas that would enhance for microgrid facilities.

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