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Suppression control of speed variation in an induction motor with fluctuating load by repetitive learning control
Author(s) -
Ishda Muneaki,
Hori Takamasa,
Ohno Masaharu
Publication year - 1993
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.4391130511
Subject(s) - feed forward , control theory (sociology) , induction motor , electronic speed control , rotational speed , torque , direct torque control , compensation (psychology) , repetitive control , inverter , vibration , noise (video) , engineering , control system , computer science , control engineering , control (management) , physics , acoustics , voltage , electrical engineering , mechanical engineering , psychology , artificial intelligence , psychoanalysis , image (mathematics) , thermodynamics
Induction motors are robust and inexpensive machines and are used widely for variable speed control because of the recent development of electronic technique. In the case where loads of the motors are compressors, pumps, and so on, the constant V/F control of the induction motors usually is employed because it is difficult to install speed sensors and accurate speed control is not required. In such loads, the rotational speed of the motors fluctuates considerably because the load torque is pulsated. When the frequency of the torque pulsation is close to the resonant frequency of the mechanical system, large vibration and acoustic noise are produced especially in the low‐frequency region. This paper proposes a method to suppress the variation of the rotational speed of the V/F controlled induction motor with a fluctuated load by feedforward compensation using a timing sensor of 1 pulse/rev, considering that the load torque varies periodically. The feedforward data by a period for the compensation is obtained by the learning control based on the repetitive control in which the motor speed is controlled by periodically reflecting the past speed error on the present V/F input to the inverter. Effectiveness of the proposed method is confirmed by approximate analysis, simulations and experiments.