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At present, vector control (VC) has been widely used in the interior permanent magnet synchronous motor (IPMSM). However, for the difference between direct and quadrature inductances and the difference of control characteristics between d-q axes current loop PI regulators, the dynamic decoupling can not be achieved, which affects the torque dynamic response and the quick startup of motor. For this...
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...
The big inertia torque will be produced, and the speed-adjusting system performance will become bad, when the brushless direct current motor (BLDCM) starts, speeds up and down with the greater inertia load. In order to solve this kind of problem, a fuzzy-PI control scheme combined fuzzy logic strategy and traditional PI control method was presented in this paper, and the simulation experiments of...
A Direct Stator Flux and Torque Control (DSFTC) scheme for asymmetrical six-phase induction motor drives is discussed in this paper. The induction machine has two sets of stator three-phase windings spatially shifted by 30 electrical degrees with isolated neutral points. The proposed control strategy is very simple and it is based on Proportional Integral (PI) regulators implemented in the stator...
Motor current decoupling control is of great importance for high dynamic performance of permanent magnet synchronous motor, especially when motor is at high speed range. Yet convention decoupling schemes do not perform well due to parameter sensitivity. In this paper, a PI type dynamic decoupling control scheme is proposed. Additional PI controllers are used to provide signals for motor d- and q-...
This paper describes the design of a new simple antiwindup control based on a PI control with an initial value of the integral state variable as a design parameter. It is combined a P controller and a PI controller. Before the changeover point, it uses a P controller. It is changed from the P controller to the PI controller after the changeover point. The changeover point is simply defined by using...
In this paper, a novel torque ripple minimization method, namely, sliding mode variable structure is proposed for switched reluctance motor (SRM). The total reference torque is calculated by the speed error via the sliding mode variable structure controller, and the expected phase torque will be got through the Torque Sharing Function. Then make margin calculations between the expected phase torque...
In this paper, a hybrid speed controller based on proportional integral (PI) controller and artificial neural network(ANN) is proposed as a speed controller for an indirect field oriented induction motor vector control system. The new controller has self-learning and self-organization capabilities. Its parameters are adjusted online according to back propagation (BP) algorithm. The weighting coefficients...
The maximum output torque developed by the machine is dependent on the allowable current rating and maximum voltage that the inverter can supply to the machine. Therefore, to use the inverter capacity fully, it is desirable to use the control scheme considering the voltage and current limit condition, which can yield the maximum torque per ampere over the entire speed range. This controller is controlled...
In this paper, a robust torque control method is proposed for a robot arm which is equipped with joint torque sensor. The proposed controller is used to control the joint torque and make it to be equal with the torque controller reference input torque. A flexible joint robot model will be introduced to model the robot arm system. The disturbance observer scheme is used to reduce the disturbance effects...
This paper presents a new approach to control the turn-off angle θoff used to excite the Switched Reluctance Motor (SRM) used in electric vehicles (EV). The controller selects the turn-off angle which will improve the performance of the electric drive system with turn-on angle constant. This control scheme consisting of classical current controller and speed controller depend on lookup table to choose...
In order to solve such problem as sensitivity to the load torque variations of PI speed controller for interior permanent magnet synchronous machine (IPMSM), and to reduce the overshoot of system speed, a sliding mode controller (SMC) for IPMSM speed control system is proposed in this paper. And the chattering problem of SMC is eliminated by applying the variable exponential reaching law and saturation...
Among all control methods for induction motor drives, Direct Torque Control (DTC) seems to be particularly interesting being independent of machine rotor parameters and requiring no speed or position sensors. The DTC scheme is characterized by the absence of PI regulators, coordinate transformations, current regulators and PWM signals generators. In spite of its simplicity, DTC allows a good torque...
A simple dynamic model of an industrial size synchronous generator operating in a nuclear power plant is developed in this paper based on first engineering principles. The constructed state-space model consists of a nonlinear state equation and a bi-linear output equation. It has been shown that the model is locally asymptotically stable with parameters obtained from the literature for a similar generator...
This paper presents a method for improving the speed profile of a three phase induction motor in direct torque control (DTC) drive system using a proposed fuzzy logic based speed controller. A complete simulation of the conventional DTC and closed-loop for speed control of three phase induction motor was tested using well known Matlab/Simulink software package. The speed control of the induction motor...
A nonparametric identification and control approach to active driveline control is investigated. A nonlinear model incorporating nonlinear clutch characteristics and driveline backlash is developed. An approach using short time Fourier transforms for nonparametric frequency response identification and smoothing is presented. The identification method is used to identify a driveline model both with...
Direct torque control (DTC) is considered as the best alternative for permanent magnet synchronous (PMSM) drives. Classic switching-table based DTC has high torque and flux ripple due to the implementation of hysteresis control. Switching frequency can be made constant by replacing hysteresis control with space vector PWM (SVM) and requires mathematical modification on SVM input. Propotional+integral...
This paper presents a direct torque control (DTC) scheme using space vector modulation (SVM) to achieve high performance speed control of a permanent magnet synchronous motor. Based on the concept of a field-oriented control principle, a Proportional-integral (PI) flux controller is first established to achieve fast direct flux control and then cascade schemes of PI torque and speed controllers are...
The purpose of this paper is to describe a new method for modulated hysteresis direct torque control algorithm for induction motor (IM) to minimize torque ripple and to obtain a constant switching frequency. The design methodology is based on space vector modulation of electrical machines with digital vector control. MATLAB simulations supported with experimental study under C++ are used. -The simulation...
Recently, interior permanent magnet synchronous motor (IPMSM) drives are getting more popular in many applications such as electrical vehicles. In order to achieve maximum torque per ampere (MTPA), knowledge of the motor parameters is necessary. Due to the saturation effect, variation of the motor parameters such as inductances is not avoidable. The main contribution of this paper is to use the well...
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