Application of Fuzzy Logic in the Phase-Locked Loop Speed Control of Induction Motor Drive

Implementation of Fuzzy Logic with High Security Registration Plate (HSRP) for Vehicle Classification and Checking in Toll-Plaza

“…Fuzzy algorithms have been successfully applied to a variety of industrial applications, including automobiles, autonomous vehicles, chemical processes, and robotics [5,6]. In the loop/piezo detector, there is no exact mathematical relationship between the vehicle length and speed, or between the length and shape.…”

Modeling and bifurcation research of phase-locked loop speed control of induction motor drive

“…However, it is difficult to employ them directly due to the nonlinear function mod ( 8). If some approximations are made, it will be Ti Substituting (7) and (S) into (9) can get (9) (a) During frequency detection, the phase error changes periodically from 0 to 2n (OJi > roo ) or from -2n to 0 (roo > m).…”

“…Up to now, no mathematical expression easy for theoretical analysis is reported. Previous researches including stability analysis [6], transient performance [1] and insensitivity to disturbance [8] we re all based on the resumption that PLL systems operate near the equilibrium and a linear model is adopted Recent researches of electronic PLL have indicated that some special phenomena such as limit cycle, bifurcation and even chaos which were unique for nonlinear systems could be found in PLL circuits. However, such researches are still blanks for PLL motor drives.…”

“…It has been indicated that the transient response of motor torque can been omitted due to the large inertia of motor if the toque response is fast enough [8]. The model of induction motor can be represented by dJ.= -CJjTIIl -k2T /r,,,£« m I r,, , + k21i/r,1 I Reference [10] has studied the operation of VPPFD.…”

“…These two curves are accordant with each other. (b) During phase detection, as the assumption in references [1]-[8], system operates near the equilibrium, the phase error is small and varies slowly, i.e. frequency error is small .…”