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Design of a Fuzzy-Tuning High Gain Observer for Speed-Sensorless Control of an AC Servo Motor  

Kim, Sang-Hoon ((주)아이노메드 연구소)
Kim, Lark-Kyo (건국대학교 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers D / v.54, no.12, 2005 , pp. 705-712 More about this Journal
Abstract
This paper deals with speed-sensorless control of an AC servo motor using Fuzzy-Tuning High Gain Observer(FTHGO). Resolver or encoder can be used to measure a rotor speed, but it has a limit to detect motor speed precisely. To solve this problem, it is studied to measure a speed of an AC servo motor without sensor. In this paper, the gain of an observer to estimate motor speed is properly set up and designed using the fuzzy control theory. It calculates the differentiation of the rotor current of the AC motor and estimates the rotor speed using it. Proposed speed sensorless control is performed using the estimated speed as the control variable. Designed FTHGO is applied to AC servo motor to verify the feasibility of the proposed observer. Feasibility of the FTHGO proposed in this paper is proven comparing the experimental results with/without the speed sensor.
Keywords
Speed-sensorless Control; Fuzzy Reasoning; Fuzzy-tuning; AC Servo Motor; High Gain Observer;
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