Direct torque control, induction motor vector control without an encoder

In this paper, a new vector control strategy is proposed to reduce torque ripples and harmonic currents represented in switching table-based direct torque control (ST-DTC) of a six-phase induction motor (6PIM). For this purpose, a new set of inputs is provided for the switching table (ST). These inputs are based on the decoupled current components in the synchronous reference frame. Indeed, using both field-oriented control (FOC) and direct torque control (DTC) concepts, precise inputs are applied to the ST in order to achieve better steady-state torque response. By applying the duty cycle control strategy, the loss subspace components are eliminated through a suitable selection of virtual voltage vectors. Each virtual voltage vector is based on a combination of a large and a medium vector to make the average volt-seconds in loss subspace near to zero. Therefore, the proposed strategy not only notably reduces the torque ripples, but also suppresses the low frequency current harmonics, simultaneously. Simulation and experimental results clarify the high performance of the proposed scheme.

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Comparison of indirect vector control and direct torque control applied to Induction Motor drive

2014 IEEE International Conference on Advanced Communications, Control and Computing Technologies ◽

10.1109/icaccct.2014.7019427 ◽

2014 ◽

Cited By ~ 3

Author(s):

K. Hemavathy ◽

N. Pappa ◽

S. Kumar

Keyword(s):

Vector Control ◽

Induction Motor ◽

Direct Torque Control ◽

Torque Control ◽

Motor Drive ◽

Induction Motor Drive

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Mathematical Modeling and Analysis of Different Vector Controlled CSI Fed 3-Phase Induction Motor Drive

Journal of Applied Mathematics ◽

10.1155/2014/623982 ◽

2014 ◽

Vol 2014 ◽

pp. 1-13 ◽

Cited By ~ 3

Author(s):

Arul Prasanna Mark ◽

Rajasekaran Vairamani ◽

Gerald Christopher Raj Irudayaraj

Keyword(s):

Mathematical Modeling ◽

Vector Control ◽

Induction Motor ◽

Control Method ◽

Direct Torque Control ◽

Torque Control ◽

Motor Drive ◽

Control Methods ◽

Matlab Simulink ◽

Dynamic Performances

The main objective of this paper is to build a simple mathematical competent model that describes the circuits and interconnections of a 3-phase squirrel cage induction motor used for industrial applications. This paper presents the detailed analysis of theoretical concepts used in mathematical modeling, simulation’ and hardware implementation. The objective of this work is to compare the dynamic performances of the vector control methods for CSI fed IM drives. Based on the results, dynamic performances of the proposed drives are individually analysed using the sensitivity tests. The tests that are chosen for the comparison are step changes in the reference speed and torque of the motor drive. Here the IM is mathematically modeled in different reference frames for input output linearization (IOL) control, field oriented control (FOC), and direct torque control method (DTC) which are designed using hardware equivalent mathematical equations. The most important contributions in this paper are mathematical simulation structure of IM model in rotor flux frame using current and speed that were developed and implemented in MATLAB-Simulink. The operation and performance of the different vector control methods are verified by simulation using MATLAB/SIMULINK and experimental results.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.313-314.55 ◽

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.

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