Title :
High resolution position control under 1 sec. of an induction motor with full digitized methods
Author :
Takahashi, Isao ; Iwata, Makoto
Author_Institution :
Dept. of Electr. & Electron. Syst. Eng., Nagaoka Univ. of Technol., Japan
Abstract :
A method of high resolution position control using an induction motor drive system is proposed. Two control methods are combined. One is an ultralow-speed control based on principles of impulsive torque drives and using a high-frequency dither signal which can compensate standstill frictions at low speed. The other is a linear control along an optimum sliding line which is decided by free-run characteristics of the mechanical load. The control circuit is composed of a high-resolution position sensor (1296 K pulses/rev), a controller using by a digital signal processor (DSP) and a pulse-width modulation (PWM) inverter having optimized PWM switching patterns. The accuracy of the position control obtained in the experiment is 1/1296000 (rev), which corresponds to one second of the mechanical angle.<>
Keywords :
digital signal processing chips; induction motors; invertors; machine control; position control; pulse width modulation; PWM; digital signal processor; high resolution position control; high-frequency dither signal; impulsive torque drives; induction motor; inverter; linear control; optimum sliding line; pulse-width modulation; ultralow-speed control; Friction; Induction motor drives; Induction motors; Mechanical sensors; Position control; Pulse circuits; Pulse inverters; Pulse width modulation inverters; Signal resolution; Torque control;
Conference_Titel :
Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/IAS.1989.96715
