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Adaptive control‐based high‐performance drive system implementation of traveling‐wave‐type ultrasonic motor
Author(s) -
Izuno Yuji,
Nakaoka Mutsuo
Publication year - 1992
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391120112
Subject(s) - ultrasonic motor , inverter , chopper , torque , control theory (sociology) , engineering , amplitude , ultrasonic sensor , power (physics) , automatic frequency control , voltage , acoustics , computer science , electrical engineering , control (management) , stator , physics , quantum mechanics , artificial intelligence , thermodynamics
In recent years, ultrasonic motors (USM) as new actuators have attracted special interest. Several kinds of constructions and characteristics of USMs have been reported so far. Of these USMs, a traveling wave‐type USM has many characteristics such as: high torque in the low‐speed range, large holding torque based upon frictional force, flexible free forms, compactness in size and low magnetic noise. In practice, an inherent mechanical resonant frequency and a velocity amplitude of USM are changed largely according to operating temperature due to frictional drive, load disturbance torque, and applied voltage levels. Therefore, it is necessary to develop a new control system which solves these items and always supplies the required power with high efficiency and high performance in the practical applications. This paper proposes mainly a new sensorless high‐performance control scheme of an inverter‐fed ultrasonic motor, which is based on a control system technology with two feedbacks incorporating automatic resonant frequency tracking and constant velocity amplitude control strategies. This control system is realized in terms of a high‐frequency chopper and a two‐phase series/parallel resonant inverter. The experimental results are demonstrated and discussed compared with the theoretical ones.