New direct torque control method considering voltage vector duty ratio used in PMSM drive

2013 ◽  
Author(s):  
Xiao Tang ◽  
Xiangyu Yang ◽  
Shiwei Zhao
Keyword(s):  
Control Method ◽  
Direct Torque Control ◽  
Torque Control ◽  
Duty Ratio ◽  
Voltage Vector

A Review of the DTC Controller and Estimation of Stator Resistance in IM Drives

2015 ◽  
Vol 6 (3) ◽  
pp. 554 ◽  
Author(s):  
Naveen Goel ◽  
Ram Narayan Patel ◽  
Saji Chacko
Keyword(s):  
Control Method ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Industrial Applications ◽  
Torque Control ◽  
Estimation Methods ◽  
Flux Linkage ◽  
Voltage Vector ◽  
Stator Flux ◽  
Stator Resistance

<span>In recent years an advanced control method called direct torque control (DTC) has gained importance due to its capability to produce fast torque control of induction motor. Although in these systems such variables as torque, flux modulus and flux sector are required, resulting DTC structure is particularly simplistic. Conventional DTC does not require any mechanical sensor or current regulator and coordinate transformation is not present, thus reducing the complexity. Fast and good dynamic performances and robustness has made DTC popular and is now used widely in all industrial applications. Despite these advantages it has some disadvantages such as high torque ripple and slow transient response to step changes during start up. Torque ripple in DTC is because of hysteresis controller for stator flux linkage and torque. The ripples can be reduced if the errors of the torque and the flux linkage and the angular region of the flux linkage are subdivided into several smaller subsections. Since the errors are divided into smaller sections different voltage vector is selected for small difference in error, thus a more accurate voltage vector is selected and hence the torque and flux linkage errors are reduced. The stator resistance changes due to change in temperature during the operation of machine. At high speeds, the stator resistance drop is small and can be neglected. At low speeds, this drop becomes dominant. Any change in stator resistance gives wrong estimation of stator flux and consequently of the torque and flux. Therefore, it is necessary to estimate the stator resistance correctly. This paper aims to review some of the control techniques of DTC drives and stator resistance estimation methods.</span>

The Influence of Moment of Inertia to Induction Motor Rotation in Sensorless Direct Torque Control and Duty Ratio

2013 ◽  
Vol 313-314 ◽  
pp. 55-60
Author(s):  
Ridwan Gunawan ◽  
Muhammad Luniara Siregar ◽  
Feri Yusivar
Keyword(s):  
Vector Control ◽  
Induction Motor ◽  
Control Method ◽  
Direct Torque Control ◽  
Moment Of Inertia ◽  
Torque Control ◽  
Duty Ratio ◽  
Motor Power ◽  
Three Phase ◽  
Torque Ripples

The vector control has become the first alternative in control of three phase induction motor. One of the vector control method which is commonly used is the direct torque control (DTC) method. However, this system has drawback due to the existence of torque ripples. The addition of the duty ratio control base on fuzzy logic can give better performance compared to conventional DTC. By doing an examination on DTC and duty ratio using small, medium and big capacities of three phase induction motors can be shown the influence from moment of inertia to rotor rotation. This paper uses MATLAB SIMULINK for the simulation study with three types of motor power, for example 1, 10 and 50 hp. It is shown that using the same parameters, a motor with a larger moment inertia gives a better performance in comparison to a motor with smaller moment of inertia.

Modified Look-Up Table for Enhancement of Torque Response in Direct Torque Controlled Induction Machine

2017 ◽  
Vol 8 (2) ◽  
pp. 522
Author(s):  
Goh Wee Yen ◽  
Nik Rumzi Nik Idris ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Direct Torque Control ◽  
Induction Machine ◽  
Drive System ◽  
Torque Control ◽  
Duty Ratio ◽  
Activation Time ◽  
Light Load ◽  
Look Up Table ◽  
Voltage Vector ◽  
Torque Response

Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.

Bus-Clamping Based Improved Discrete Duty Ratio Control Technology of Direct Torque Control for Induction Motors

2014 ◽  
Vol 541-542 ◽  
pp. 1177-1184
Author(s):  
Hong Xia Yu ◽  
Chuang Li
Keyword(s):  
Induction Motors ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Torque Control ◽  
Control Technique ◽  
Duty Ratio ◽  
Voltage Vector ◽  
Speed Range ◽  
Zero Voltage

One of the disadvantages of traditional direct torque control is high torque ripple, A method of reduce torque ripple was proposed basing bus-clamping and duty ratio control technique in this paper. Firstly, the switch vector table with bus-clamping technology was improved by analyzing the role of zero voltage vector to reduce torque ripple in different sector of voltage. Secondly, on the base of combing the improved bus-clamping direct torque control (BCDTC) and discrete duty ratio control (DDRC), a new switch vector table with discrete duty ratio and bus clamping was designed by analyzing the role of zero voltage vector to reduce torque ripple in different speed range. Finally, simulations are performed to verify the proposed strategies.

Minimum Voltage Vector Error Based Direct Torque Control for Induction Motors

2021 ◽  
Vol 9 (8) ◽  
pp. 2182-2188
Author(s):  
Hrushikesh V. Bihade
Keyword(s):  
Induction Motors ◽  
Direct Torque Control ◽  
Vector Current ◽  
Torque Control ◽  
Duty Ratio ◽  
Switching Frequency ◽  
Vector Error ◽  
Voltage Vector ◽  
Torque Response ◽  
Torque Ripples

Abstract: Traditional DTC popular because of its simplicity, Robustness, and first torque response. However, it is associated by high THD, large torque ripples and variable switching frequency. Which leads the way to scope of research in traditional DTC drive. thus, to further raise the performance, a method based on minimum voltage vector error is proposed in this dissertation. To cut down the error value between voltage vector imposed on the machine terminal and reference voltage vector, the value of Duty ratio is effectively optimized by propose method. The Optimization process does not increase the complexity of method. The proposed method is simulated in MATLAB environment. Keywords: TDTC, MVE DTC, Torque ripples, voltage-vector, current THD

The Implementation of Permanent Magnet Synchronous Motor Direct Torque Control

2013 ◽  
Vol 712-715 ◽  
pp. 2757-2760
Author(s):  
Jun Li Zhang ◽  
Yu Ren Li ◽  
Long Fei Fu ◽  
Fan Gao
Keyword(s):  
Coordinate System ◽  
Permanent Magnet ◽  
Control Method ◽  
Block Diagram ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Torque Control ◽  
Two Phase

In order to deeply understand the characteristics of the permanent magnet synchronous motor direct torque control method, its mathematical models were established in the two-phase stationary coordinate system, the two-phase synchronous rotating coordinate system, and x-y stator synchronous rotating coordinate system. The implementation process of direct torque control method in varied stator winding connection was analyzed in detail. In order to improve the speed and torque performance of the permanent magnet synchronous motor, the direct torque control block diagram and the space voltage vector selection table were given. Finally, the summary and outlook of reducing torque ripple in the permanent magnet synchronous motor direct torque control methods.

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