SENSORLESS INDUCTION-MOTOR DRIVE - AN INNOVATIVE COMPONENT FOR ADVANCED MOTION CONTROL

This paper reports the basic concept and recent industrial application s of a sensorless vector-controlled speed-control system for an invert er-fed induction motor in Japan. The vector control artificially gives the linear torque controllability, which is inherent for a separately excited DC motor, to the induction motor drive. First, in this paper, the fundamental concept of vector control is introduced. Next, repres entative speed-sensorless vector-control systems will be related. Also , a method for the automatic measurement of the electrical parameters of the induction motor is introduced. To know the motor parameters pre cisely is especially important for a speed-sensorless vector-control s ystem. Finally, several examples of industrial applications of the sen sorless speed control are described. Copyright (C) 1997 Elsevier Scien ce Ltd.