Title :
Digital PLL technique for precise speed control of SR drive
Author :
Ahn, Jin-Woo ; Oh, Seok-Gyu ; Pyo, Sung-Young ; Kim, Cheul-U ; Hwang, Young-Moon
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA
Abstract :
The switched reluctance drive is known to provide good adjustable speed characteristics. However, higher torque ripple and lack of the precise speed control are drawbacks. These problems lie in the fact that SR drive is not operated with an MMF current specified for dwell angle and input voltage. To reduce torque ripple and to have precise speed control, the SR drive has to control the dwell angle and input voltage instantaneously. In the paper, a PLL (phase locked loop) technique is adopted to regulate the dwell angle and input voltage. A PLL control technique in conjunction with a dynamic dwell angle control scheme has good speed regulation characteristics. The DSP based control system is used to realize this drive system. Test results show that the system has the ability to achieve good dynamic and precise speed control
Keywords :
angular velocity control; digital control; digital phase locked loops; digital signal processing chips; machine control; reluctance motor drives; voltage control; DSP based control system; MMF current; SR drive; adjustable speed characteristics; digital PLL technique; dwell angle control; higher torque ripple; input voltage control; precise speed control; speed regulation; torque ripple reduction; Control systems; Inductance; Magnetic circuits; Phase locked loops; Reluctance machines; Reluctance motors; Strontium; Torque control; Velocity control; Voltage control;
Conference_Titel :
Power Electronics Specialists Conference, 1999. PESC 99. 30th Annual IEEE
Conference_Location :
Charleston, SC
Print_ISBN :
0-7803-5421-4
DOI :
10.1109/PESC.1999.785604