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A speed control method for a PM motor using a speed observer and a low‐resolution encoder
Author(s) -
Ohishi Kiyoshi,
Ogawa Yasuaki,
Dohmaki Hideo
Publication year - 2003
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.10121
Subject(s) - encoder , control theory (sociology) , observer (physics) , rotary encoder , electronic speed control , voltage , pulse width modulation , computer science , vector control , servomotor , servomechanism , servo control , induction motor , servo , engineering , control engineering , control (management) , physics , artificial intelligence , electrical engineering , quantum mechanics , operating system
This paper proposes a new speed control method for a PM motor using a low‐resolution encoder and a speed observer. The servo system should be economical and simple. For this purpose, this paper realizes the high‐performance speed control system using a low‐resolution encoder, whose performance is nearly equal to the performance of speed servo system using a conventional optical encoder. The speed observer uses the information of motor current and motor voltage. The rotor position is calculated by the estimated value of speed observer. This observer has the influence of electrical parameter variation. This paper proposes the correction algorithm of both the voltage error of PWM inverter and the electrical parameter variation. The experimental results and numerical simulation results point out that the proposed speed control system has the desired speed response with respect to parameter variations and load torque perturbation. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 143(1): 66–75, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10121