No abstract

Demonstrated is a novel type of sigleended resonant inverter using a new Bipolar Darlington-Transistor that operates efficiently in the frequency range of 20kHz to about 50kHz. The inverter implementation for an induction-heating range includes a unique power control strategy. The analysis and performance eveluations for circuit design are carried out herein.

This paper presents the operating principle of the ultrasonic motor (USM) as a new actuator and its steady-state characteristics for application-specific servo motion systems. The latest developed inverter-drive traveling wave type ultrasonic motor (TUSM) is suitable for direct-drive motion systems. We describe a positioning servo motion system using the TUSM, which operates under a feasible fuzzy-reasoning controller with velocity and positional state-variable feedback schemes. Experimental verifications are given and their results are evaluated using a one-axis servo motion drive system. It is also proved that a new compact direct-drive servo motion system using inverter-fed USM which incorporates a microprocessor-based two-input and one-output fuzzy-reasoning controller is more acceptable for a specific direct-drive application.

Thispaper describes the schematicreview o f Travelling-wave type Ultrasonic Motor (T-USM) and a newly-proposed weigt-quality speed tracking controller of T-USM on the basics o f the computer software-based varia ble-gain adjustm en t stra tegy.Its speed tracking characteristics capable o f improving speed ripple, speed regulation and speed tracking characteristics are feasibly demonstrated i n experiment as compared with a previously-developed fuzzy-logic speed controller of T-USM actuated servo drive system. I t is proved that T-USMspeed control scheme developed herein i s practically acceptable for direct-drivespeed servo system.

The authors introduce a new con1iguration 01 resonant type high-1requency inverter which has inherent last-response Variable Voltage Variable Frequency (VVVF) strategy and high power adaptability.The two versions 01 this inverter which use voltage-vector and current-vector control have been investigated by means 01 extensive computer simulation show i ng the operating characteristics in terms of normalized variables.Two experimental set-ups using Static Induction Transistors lor induction heating application and A-SCRs lor DC/ AC wave10rm synthesis are also described.