Toshio Inaji

New Technology for Compact VTR: Sensorless Capstan Motor

Recent advances in VTR camcorders have been remarkable, and with the appearance of compact and lightweight models the market has grown rapidly. But in order to achieve further expansion of the market for camcorders, it will be necessary to develop models which are even smaller, lighter and more inexpensive. From the standpoint of electromechanical control, this im¬ plies a need to improve and reduce the size of driving motors. Among the motors used in camcorders, cyl¬ inder motors employing sensorless drive meth¬ ods which do not require rotor magnet position sensors have been put into practical use, and are contributing to reduce camcorder sizes and prices [1]. On the other hand, in order to

A control system for 3.5 inch 16MB floppy disk drives

We will report on a magnetic head positioning control system and a track following control method through which increased capacity and high speed has been achieved and in which a 3.5 inch 16 MB high density flexible disk drives (FDD) is employed.