Title :
A motor speed control system using a hybrid of dual-loop PLL and feed-forward
Author :
Machida, Hidekazu ; Kambara, Michinobu ; Tanaka, Kouta ; Kobayashi, Fuminori
Author_Institution :
Maizuru Coll. of Technol., Kyoto, Japan
Abstract :
PLL speed control systems can completely reject speed error and steady-state phase error for constant-speed inputs. Though it does not usually handle inputs including acceleration, the dual-loop scheme improves, as a feed-forward control system, rising time and phase error for acceleration input. However, since it is fundamentally a third-order PLL, it cannot avoid over/undershoots when gain is set high for fast responses. Nonetheless, the first loop has no over/undershoot, since it is an ideal second-order PLL system. In this article, to solve the problem, we show a hybrid system of the dual-loop PLL and feed-forward. It has no overshoot thanks to the rising up characteristics of the first PLL, which cannot be achieved in traditional PLL systems.
Keywords :
acceleration control; electric motors; feedforward; machine control; phase locked loops; velocity control; PLL speed control systems; acceleration input; dual-loop PLL system; feedforward scheme; motor speed control system; phase error; phase locked loop; rising time; Acceleration; Control systems; Detectors; Error correction; Feedforward systems; Filters; Phase detection; Phase locked loops; Velocity control; Voltage-controlled oscillators;
Conference_Titel :
Advanced Motion Control, 2010 11th IEEE International Workshop on
Conference_Location :
Nagaoka, Niigata
Print_ISBN :
978-1-4244-6668-9
Electronic_ISBN :
1943-6572
DOI :
10.1109/AMC.2010.5464001