No. 1326
	Current Situations and Future Issues of Adjustable-Speed AC Drive
	Investigating R&D Committee on Current Situations and Future Issues of Adjustable-Speed AC Drive
	Keyword : high-speed operation, low-speed sensorless control, large capacity inverter, high response and torque accuracy, downsizing and efficiency
	Adjustable-speed AC drive technology has been applied to wide range of fields, from industrial applications to consumer electronics, and so has become an indispensable technology in modern society. Adjustable-speed AC drives are used not only replacement of DC drives, but also new fields which take advantage of their characteristics such as hybrid cars, etc. In addition, adjustable-speed AC drives can dramatically improve performance and function than DC drives because of their characteristics, there are many cases which they are used in the existing fields and improving performance or function as downsizing, efficiency or high-performance. However, these improvements of adjustable-speed AC drive technologies have achieved for specific purpose, there aren't many documents which summarizing the entire technologies of adjustable-speed AC drives. Thus, this technical report summarizes investigating of adjustable-speed AC drive technologies from the point of view of high-speed operation, low-speed sensorless control, large capacity inverter, high response, torque accuracy, downsizing and efficiency.
	©2007. The Institute of Electrical Engineers of Japan