A servo system of AC motor based on voltage modulation fitting for FPGA and consideration of voltage saturation

This paper proposes a space voltage vector modulation (SVM) method for a speed servo system to obtain a quick current response. The proposed SVM method shortens the control lag time of the conventional SVM inverter. In addition, this proposed method is easily implemented in hardware using an FPGA (Field Programmable Gate Array) because the proposed SVM equations are transformed into expressions that hardly need multiplication. By using the proposed SVM method, the servo system realizes quick and stable current control with wide bandwidth. Moreover, by using PI controllers considering the voltage saturation and the torque limiter to the speed servo system, the servo system carries out stable speed control on voltage saturation. Both the proposed SVM method and the PI controllers considering voltage saturation are applied to the speed servo system of a vector controlled induction motor. The effectiveness of both the proposed SVM method and the PI controllers considering voltage saturation is verified by the experimental results. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 173(1): 60–68, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20989

[1]  T. Yokoyama,et al.  Experimental result of multirate deadbeat control for PWM inverter using FPGA based hardware controller , 2003, The 25th International Telecommunications Energy Conference, 2003. INTELEC '03..

[2]  Kiyoshi Ohishi,et al.  Design Method of Digital Robust Speed Servo System Considering Output Saturation , 1999 .

[3]  Kazuhiro Ohyama,et al.  Application of FPGA to Rotor Position Detection of SR Motor Using Rotary Encoder , 2005 .

[4]  K. Ohishi,et al.  New field-weakening control considering voltage saturation for vector control system of induction motor , 2005, 2005 European Conference on Power Electronics and Applications.

[5]  Kiyoshi Ohishi,et al.  High-performance speed servo system considering Voltage saturation of a vector-controlled induction motor , 2006, IEEE Transactions on Industrial Electronics.

[6]  Patrick Wheeler,et al.  New Methods for the Active Compensation of Unbalanced Supply Voltages for Two-Stage Direct Power Converters , 2006 .

[7]  Ahmet M. Hava,et al.  Simple Analytical and Graphical Methods for Carrier-Based PWM-VSI Drives , 1999 .

[8]  Satoru Sone,et al.  New PWM Method for Three-Level Inverter Based on Voltage Space Vector Considering Suppression of Neutral Point Potential Variation , 1995 .

[9]  Takao Kawabata,et al.  High Efficiency and Low Acoustic Noise Drive System Using Open-Winding A. C. Motor and Two Space Vector Modulated Inverters , 2002 .

[10]  K. Ohishi,et al.  New Space Voltage Vector Modulation Inverter Considering Voltage Saturation for Speed Servo System of Induction Motor , 2006, 2006 IEEE International Conference on Industrial Technology.

[11]  N. Yadaiah,et al.  FPGA based Space Vector PWM Control IC for Three Phase Induction Motor Drive , 2006, 2006 IEEE International Conference on Industrial Technology.

[12]  Raymond Hanus,et al.  Anti-windup, bumpless, and conditioned transfer techniques for PID controllers , 1996 .