Examination and implementation for direct torque controlled permanent magnet synchronous motor with space vector modulation

Abstract

This study investigates the direct torque control strategy of permanent magnet synchronous motor with the space vector modulation, on account of large torque fluctuation and varied switching frequency of classic direct torque control strategy. The relationship among the terminal control voltages and the torque and stator flux of the permanent magnet synchronous motor is derived through the dynamic model of motor. Accordingly, the torque and the flux closed-loop feedback control structure are established, where the error signals are regulated by the proportional and integral controllers to generate output voltages. Furthermore, the parameters of the controllers are designed through explicitly analyzing the frequency domain models of the torque control loop and the flux control loop. The accurate calculation formula of control parameters, which has both explicit setting target and definite physical meaning, is obtained. Therefore, the design of torque and flux controller parameters becomes easy in the direct torque control with space vector modulation technology, and satisfactory flux and torque control can be acquired. Finally, simulation and experimental tests are demonstrated in support of the validity of the investigated scheme and the feasibility of the proposed controller parameter design.

Design and Xilinx Virtex-field-programmable gate array for hardware in the loop of sensorless second-order sliding mode control and model reference adaptive system–sliding mode observer for direct torque control of induction motor drive

“…The combination between the space vector modulation (SVM) technique and the DTC (SVM-DTC) has been considered as a helpful solution for overcoming the conventional DTC 1 performance. 4,5 Unlike the conventional DTC, the SVM-DTC reduces the ripples and the harmonics distortions, and it ensures an operation with a fixed switching frequency. 6 Nevertheless, the SVM-DTC is usually based on a proportional integral (PI) controller for controlling the rotor speed of an induction motor (IM) drive.…”

Second-order sliding mode-direct torque control and load torque estimation for sensorless model reference adaptive system–based induction machine

“…The integration of the space vector modulation (SVM) instead of the use of a lookup switching table in the DTC control scheme was a very helpful solution. 2,3 SVM offers fixed switching frequency, higher DC voltage utilization ratio and lower harmonics distortion. 4 Therefore, it provides reduced ripples and lower switching losses, unlike conventional DTC.…”