|
|||||
|
|
Suppression control of speed variation in an induction motor with fluctuating load by repetitive learning control |
|
| Authors: | Muneaki Ishda Takamasa Hori Masaharu Ohno |
| Affiliation: | 1. Mie University Muneaki Ishida obtained a Dr. of Eng. degree in 1980 from Nagoya University. He became an Assistant in the Department of Electrical Engineering, Faculty of Engineering, of the same university in April of the Same year, and has been an Associate Professor in the Department of Electrical Engineering, Faculty of Engineering, Mie University since June 1987. He is engaged mainly in research on the development of new-type motors using power electronics and piezoelectric elements. He is a member of IEEE, Japan Society for Power Electronics;2. and the Society of Instrument and Control Engineers.;3. Mie University Masaharu Ohno obtained a Master's degree in Electrical Engineering from Mie University in March 1990. He has been with Mitsubishi Electric Corporation since April of the same year.;4. Mitsubishi Electric Corporation Takamasa Hori graduated in 1961 from the Department of Electrical Engineering, Osaka University. He joined the Hitachi Research Laboratory of Hitachi Ltd. in April of the same year. He has been a Professor in the Department of Electrical Engineering, Mie University. He was a chairman of the Technical Program Committee of IECON'91. a member of the Special Committee of Industrial Applications Society of the I.E.E., Japan, and a vice president (in charge of technology) of the IEEE/IES in fiscal year 1990. He is an IEEE Fellow and a member of Japan Society for Power Electronics;5. the Society of Instrument and Control Engineers of Japan;6. and Institute of Systems, Control and Information Engineers. |
| Abstract: | 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. |
| Keywords: | Induction motor fluctuating load repetitive learning control suppression of speed variation |
