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An Adjusted Current Control System for Signal Injection‐Based Position Sensorless Control and Parameter Identification
Author(s) -
Jung SukHwa,
Ohnuma Takumi,
Doki Shinji,
Okuma Shigeru,
Fujitsuna Masami
Publication year - 2014
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.22416
Subject(s) - control theory (sociology) , controller (irrigation) , signal (programming language) , transient (computer programming) , bandwidth (computing) , transient response , transient state , current (fluid) , control system , engineering , computer science , control (management) , telecommunications , electrical engineering , artificial intelligence , agronomy , biology , programming language , operating system
SUMMARY This paper proposes a current controller for signal injection‐based control schemes such as those for parameter identification and position sensorless control. In a conventional current control system with voltage signal injection, the separation of the injected frequency components from the current is carried out by using band stop filters. However, the separation is not accurate, especially when the system is in the transient state and/or when the current controller bandwidth is close to the injected signal frequency. This leads to distortion of the transient response and affects the stability of the current control system. The proposed controller estimates the injected frequency components in the current on the basis of a motor model by using the injected signal as the input. Therefore, accurate signal separation is accomplished even in the transient state. The current controller's stability and dynamic performance are improved significantly. Experimental results are presented to validate the proposed method. Factors that play an important role in the implementation of the controller, such as time delay and parameter variation, are discussed. © 2014 Wiley Periodicals, Inc. Electr Eng Jpn, 187(1): 58–66, 2014; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.22416