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Six-phase motors are widely used in industry, for they can be useful in increasing motor capacity with limit voltage level, and be more reliable in continuous operating and be more robust in performance controlling. Up to the present, there have been many researches on six-phase motors, and they are usually analyzed by analytical methods. However, most of six-phase motors are used with variable frequency...
Classical direct torque control (DTC) has advantage in absence of coordinate transform and voltage modulator block. However, it may have disadvantage in controlling electromagnetic torque. DTC produces high ripple in electromagnetic torque as it is not directly controlled. High torque ripple causes vibrations to the motor which may lead to component lose, bearing failure or resonance. Thus, Fuzzy...
Torque pulsations exist in ring permanent torque motors, which seriously degrade the drive performance of system at low speeds. In view of the periodic nature of torque ripple, adopt fuzzy iterative learning control (F-ILC) controller to minimize the torque ripple. It records the torque error and the compensating reference current of last cycle to update the compensating reference current of this...
Predictive direct torque control for a three-level neutral point clamped inverter is proposed. The main differences between standard direct torque control and the proposed approach are the flexibility and simple algorithm implementation, which does not require complex predefined switching tables nor logic to select among them, as standard direct torque control requires. The dynamic performance is...
In the traditional direct torque control (DTC) of induction motor, the low order harmonic component of stator current is very large when the motor is running at low speed. It leads to high torque ripple of motor in low speed. To solve this problem, a new control method has been proposed in this paper. Base on the traditional DTC method, electromagnetic torque and flux models have been analyzed. To...
It was very hard to determinate the accurate mathematical model of switched reluctance motor, which caused a big trouble to analyzing the Switched reluctance motor. For the above reasons, this paper presents a control model which use switched reluctance motor torque for the control volume. According to the variation of torque, control the stator voltage vector and the rotation speed of the stator...
This paper presents a fuzzy logic controller (FLC) based direct torque control (DTC) scheme for speed control of IM drive over a wide speed range. The FLC is used to adjust the bandwidth of torque hysteresis controller in order to reduce the torque ripple of developed torque and hence to improve motor dynamic response. The effects of torque hysteresis band amplitude on the torque ripple of IM are...
Fault-tolerant flux-switching permanent magnet (FT-FSPM) motor is a new class of stator-PM brushless motors, a potential candidate for many applications where reliability and power density are of importance. In this paper, a new method is proposed for torque ripple minimization, in which the key is to introduce harmonic currents to compensate for non-ideal sinusoidal back-EMF. Moreover, a fault-tolerant...
In this paper, we present a wireless instantaneous torque measurement system based on MEMS accelerometers and high frequency RF transmitter. We develop this system for instantaneous torque and speed measurement on machine rotary shafts. Real time data are transmitted to the DSP board that is used to implement traditional vector control of an induction motor. It can be applied to any rotating system...
This paper presents a Space-Vector Modulated (SVM) Direct-Torque-Control (DTC) scheme for a direct-drive permanent magnet synchronous generator (PMSG) and a gird converter for wind energy without any position sensor. Direct control of the rotating velocity and amplitude of the stator flux vector allows very fast torque response of the PMSG according to the generator speed. Fixed switching frequency...
This paper presents a control scheme combined with neural network, fuzzy controller and PI- controller for the brushless DC motor. The neural network control learned continuously and gradually becomes the main effective control. Performances of the proposed neural network are compared with the corresponding fuzzy PI controller and conventional PI controller. Matlab/simulink software was used to simulate...
High power density, high speed operation, high efficiency and wide speed range made the interior permanent magnet (IPM) synchronous motors an interesting choice for ac drive systems. Different control strategies have been proposed to reach a high performance drive system. Direct torque control (DTC) is one of these widely used methods which has fast torque dynamic and a simple structure. Different...
This work proposes an algorithm to control the torque of a switched reluctance machine (SRM). A 6/4 three phases SRM drive is controlled and simulated on PSCAD/EMTDC software. The machine is modeled using an analytical model that takes into consideration the non-linearity of the machine. The control is designed as a Model Predictive Control (MPC) using Discrete Space Vector Modulation (DSVM) with...
A sliding mode controller for permanent magnet synchronous machine (PMSM) is investigated in this paper, in which direct torque control (DTC) concept, variable structure control and space vector modulation (SVM) are integrated to achieve high performance. It features in very low flux and torque ripple, strong robustness and fixed switching frequency. Then, an FNN is investigated to optimize the control...
The predictions of the stator linkage and the torque are not only the important steps in Direct Torque Control (DTC) system, but also one of the input parameters to select the suitable space voltage vectors. In order to overcome the effect of calculation models and the stator resistance on the predictive precision of linkage, a new algorithm based on the predictive calculation to predict the stator...
A sliding mode controller for induction motor (IM) is investigated in this paper. It features in very low flux and torque ripple. In order to guarantee electromagnetic torque and stator flux to track its reference signal strictly, the electromagnetic torque sliding mode variable and stator flux sliding mode variable were selected separately. Furthermore, a robust stator flux observer is designed for...
In low-speed, direct torque control has such problems, like inevitable serious ripples in flux, disorder of the switching frequency, and else. Combined discrete space vector modulation (DSVM) with direct torque control (DTC) for bearingless induction motor torque control. Through the multi-torque hysteresis comparator to increase the number of target vectors, and reduce the torque ripple. Because...
Normal direct torque control have the problem of big electricity and torque ripple in low speed, a new control method was presented in this paper in order to solve this problem. We use discrete duty ratio control technology in high region while intelligent direct torque control is used for the low speed region control. Simulation and experiment result show that new method is more effective than traditional...
A novel direct torque control strategy, using genetic algorithm on-line to optimize the fuzzy PI controller, is proposed. In this approach, according to speed error and its first time derivative, the proportional coefficient Kp and integral coefficient Ki can be on-line adjusted by fuzzy adaptive PI speed regulation, and the fuzzy logic adapter parameters are optimized by genetic algorithm to improve...
It is very important to identify the electrical parameters accurately for the servo system of PM motor, that keep the fine torque response and the fine speed response. Generally, the electrical parameters of PM motor are identified by using the motor voltage and motor current. However, current sensor often has the offset value. In this case, the servo system of PM motor has the torque ripple and can...
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