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The main purpose of this paper is to minimize the loss while reducing the flux and torque ripples in permanent magnet synchronous motors (PMSMs) under direct torque control (DTC). Offline method is used to minimize the loss and obtain the optimal flux. To reduce the amount of computation, the optimal flux table is produced according to the conditions in which the machine works. To reduce the flux...
In this study, direct torque control (DTC) of the permanent magnet synchronous motor has been analyzed, the stator flux and voltage space vectors are studied and a simulation of the direct torque control of a permanent magnet synchronous motor is realized. Afterwards, an additional LP filter is attached to the simulation setup in order to suppress harmonics on the current and voltage. Torque and flux,...
This paper presents a comprehensive comparison between two speed control techniques for permanent magnet synchronous machine using vector control (VC) and direct torque control (DTC). The main characteristics of vector control and direct torque control are studied by simulation emphasizing their advantages and disadvantages. The performances of the two control techniques are evaluated in terms of...
In this work a fuzzy inference system is employed for the control of a PWM based direct torque control (DTC), driving a dual three phase induction machine (DTPIM). DTPIM has two, three phase windings spatially phase shifted by gamma (=60deg in this research) electrical degrees. The proposed control scheme uses a Fuzzy inference system to modulate the phase of stator voltage vector applied to the DTPIM...
An online adaptive routine is presented for optimum direct torque control of Interior permanent magnet synchronous machines (IPMSM). Optimum control is provided by minimizing of a predefined particular cost function which causes proper selecting of the voltage vector to minimize electrical torque variations. In addition, the required parameters of cost function are estimated continuously. For this...
This paper provides analysis and evaluation of two main control methods: field orientation and direct torque control, for controlling a six phase induction motor under normal and open phase fault conditions. The machine has two three phase windings spatially phase shifted by 60 electrical degrees with one common neutral point. The dynamic model of the machine is based on the transformation to orthogonal...
In this paper, a new direct torque control (DTC) algorithm for six phase induction machines (6PIM) when one phase is lost will be introduced. The machine has two sets of three phase windings spatially shifted by 60deg electrical degrees. A general decoupled model of the induction machine with up to four open phases is given. Fixed switching frequency and low torque ripple are obtained using this method...
The mathematical models of five-phase permanent magnet synchronous motor (PMSM) in abc frame and alphabeta frame are established, and the relationships between the torque and fundamental components, loss and harmonic components are revealed. To suppress the high third harmonic current appeared in five-phase machine especially, a novel space vector pulse width modulation (SVPWM) method which has a...
This paper presents the direct torque control (DTC) of an interior permanent magnet synchronous motor (IPMSM) based on sliding mode technique. Two adaptive cascade sliding mode controllers (ASMC) are designed; one for regulating the motor speed and the other is dedicated for controlling the electromagnetic torque. Consequently, the demerits of classical DTC (large torque and current ripples due to...
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