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Vector control methods have made accurate and fast control of induction machines possible. The success of indirect rotor-flux-oriented-control (RFOC) depends greatly on the accuracy of the machine parameters, especially the rotor time constant. In this paper, rotor resistance data is extracted from standard current-slip tests and analyzed. The data show that the rotor resistance appears to change...
In this paper a fast flux search controller based on the Neuro-fuzzy systems is proposed to achieve the best efficiency of a direct torque controlled induction motor at light load. In this method the reference flux value is determined through a minimization algorithm with stator current as objective function. This paper discusses and demonstrates the application of Neurofuzzy filtering to stator current...
This paper presents the robust speed and parameters control of induction motors (IM) without speed sensors. The reactive power Model Reference Adaptive System was used to estimate the speed. The method is independent from stator resistance and pure integrator in reference model. Furthermore, parameters, used in the speed approximation, are not affected by temperature change. A squirrel-cage induction...
In this paper, an improved direct torque control (DTC) scheme for surface permanent magnet synchronous machine (SPM) is investigated, which features in very low flux and torque ripple and almost fixed switching frequency. It is based on the deadbeat control of the flux and torque. Simulation and experimental results show that the flux and torque ripples are greatly reduced when compared with those...
The purpose of this study is to propose a new pole position estimation method of interior permanent magnet synchronous motors, IPMSMs. This new method uses both back EMF and saliency effects without high frequency component injection. Only standard current sensors, which are inherently used for fundamental current control, are used to estimate pole position. The proposed method enables to estimate...
The objective of this work is to compare and analyze brushed DC, induction, brushless DC, and synchronous reluctance machines and drives in reciprocating applications. In particular, this work is focused on wave energy generator applications. In contrast to wind energy, the ocean environment can require bidirectional operation of the generator. For this study, the efficiency of a set of small induction,...
Multiphase motor drives have many advantages over the traditional three-phase motor drives. In this paper we firstly deduce the mathematic modeling for a dual-three-phase permanent magnet synchronous motor (PMSM) according to vector space decomposition theory. Then, a sensorless vector control based on the model reference adaptive system (MRAS) is developed for a dual-three-phase PMSM and the system...
In this paper, an uniform mathematic model of three-level inverters feed induction motor drives system has been constructed. Based on the application of the discrete space vector modulation (DSVM), a DTC strategy of three-level inverters induction motor drives system is proposed. With DSVM-DTC algorithm, the neutral-point (NP) voltage balancing problem and high dv/dt of output voltage is restrained...
One time radial vibration, mostly caused by rotary eccentric load, may reduce the reliability and operating life of motors. In order to mitigate the one time radial vibration in permanent magnet motors, a real time detection method for rotary eccentric load based on the theoretical analysis of the motor vibration and the mechanical analysis was given, and a novel control strategy based on FOC (field...
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