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17 December 1998 Sliding mode controller for positioning servo systems with parameter perturbances
Kai Xu, Yan Lin, Yonghua Li
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Proceedings Volume 3518, Sensors and Controls for Intelligent Machining, Agile Manufacturing, and Mechatronics; (1998) https://doi.org/10.1117/12.332812
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States
Abstract
In general, the commuting voltage for a DC pulse width modulator (PWM) fluctuates along with the power supply voltage changes. Therefore, when we describe the mathematical model of a PWM by a first order inertia unit, the giant of PWM unit will vary, e.g. the parameter of current loop will be perturbed. Additionally, in order to raise the safety coefficient of the resist voltage capacity of a large power transistor, the DC supply voltage is usually designed on a low level. As a consequence it causes a low fullness coefficient of starting current in the transient interval. Particularly when the PWM system is in a high velocity setting, the fullness coefficient of starting current is even lower, thus the designed maximum acceleration of system can not be guaranteed, and the transient process slows down. Therefore, when the setting is changed the parameter perturbance of PWM can not be ignored. Using the system identification technique to establish the mathematical model of the PWM system, we also observed that when the load of the positioning servo-system is an eccentric rotating plant, the change of the loading moment along with the angle displacement causes the parameter variation of the PWM system.
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Kai Xu, Yan Lin, and Yonghua Li "Sliding mode controller for positioning servo systems with parameter perturbances", Proc. SPIE 3518, Sensors and Controls for Intelligent Machining, Agile Manufacturing, and Mechatronics, (17 December 1998); https://doi.org/10.1117/12.332812
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KEYWORDS
Servomechanisms
Mathematical modeling
Modulators
Power supplies
Safety
System identification
Transistors
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