scholarly journals Optimization of torque ripples in direct torque control drives

2021 ◽  
pp. 41-53
Author(s):  
Andrey Kromm ◽  
◽  
Gennady Simakov ◽  
Valery Topovsky ◽  
◽  
...  
Keyword(s):  
Hybrid Method ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Hybrid Control ◽  
Direct Torque Control ◽  
Torque Control ◽  
Drive Control ◽  
Electrical Motors ◽  
Torque Ripples

The article discusses the features of the synthesis of a hybrid method for commutation of a three-phase inverter in a classic version of drives with direct torque control (DTC), which involves the use of relay characteristics in the flux- and torque control blocks. It is proved that the output voltage of a converter based on a B6-inverter formed by only six basic vectors (excluding the zero vector) limits further optimization of flux- and torque ripples in the electrical motors. It has also been proven that with the classical drives with direct torque control, the torque ripples on the motor shaft are indeed higher than in systems with pulse width modulation. An analysis of the method was carried out which could allow reducing the amplitude of the torque ripples when drives with direct torque control are applied for motors supplied with only basic vectors of the inverter due to the modified (hybrid) method of inverter commutation. The conditions under which the hybrid control method of the inverter is really capable of reducing the amplitude of the motor flux- and torque ripples are considered. Based on the analysis of the proposed solution, the law of hybrid control of the inverter is presented by means of the formation of additional vectors of its output voltage via basic vectors of the inverter. The advantages of the method include the simplicity of drive control under development or in the existing drive control system, the implementation of which is carried out exclusively by a software product. With the absence of iterative methods of mathematics, the resources of microprocessor control units are reduced, which makes this method even more attractive in low-budget electrical drives that do not claim to be "high-end" of control blocks. The oscillograms are shown of a flux and current of motor with direct torque control motor application only with six base vectors of the output voltage of a semiconductor inverter and a drive with direct torque control by the hybrid method with additional voltage vectors based on the basic vectors of the inverter.

scholarly journals FLC-DTC METHOD FOR TORQUE RIPPLES MINIMIZATION OF 8/6 SWITCHED RELUCTANCE MOTORS DRIVE

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Hafeezul Haq ◽  
Halil Ibrahim Okumus
Keyword(s):  
Fuzzy Logic Controller ◽  
Control Method ◽  
Direct Torque Control ◽  
Switched Reluctance Motor ◽  
Torque Control ◽  
Switched Reluctance ◽  
Electric Drives ◽  
Reluctance Motor ◽  
High Torque ◽  
Torque Ripples

The switched reluctance motor gains a significant response in industries in the past decade because of its ruggedness, high torque to inertia ratio, simple structure, high reliability and inexpensive manufacturing capability. These features make it a suitable candidate for various applications and electric drives. However, In the field of electric drives a switched reluctance motor drive is having doubly salient structure thus it inherently produces high torque ripples and acoustic noise problems and its controlling difficulties that is an undesirable effect for vehicle applications, especially at low speed. The main objective of this paper is to minimize the torque ripples and to control its speed. In this paper a fuzzy logic controller based direct torque control method is used for speed controlling and for controlling of torque ripples of the 8/6 SRM drive. It’s modelling and application of fuzzy logic controller based direct torque control method is done in MATLAB/SIMULINK environment.

scholarly journals Modeling of Three Phase Induction Motor with Dtc Drive Fault Analysis using Fuzzy Logic

2020 ◽  
Vol 9 (1) ◽  
pp. 1196-1202 ◽  
Keyword(s):  
Induction Motor ◽  
Monitoring System ◽  
Control Method ◽  
Direct Torque Control ◽  
Fault Analysis ◽  
Torque Control ◽  
Motor Drive ◽  
Heavy Load ◽  
Three Phase ◽  
Torque Ripples

Three phase induction motor drives are the most widely used drives in heavy load industries Because of its wide usage in industry, a small fault occurring in the motor drive may cause huge damage and results in failure of heavy machinaries.Inorder to avoid these failures, all the possible faults that may occur in induction motors are analysed. Based on the analysis performed, the parameters that may cause faults in the drive system are monitored. Even a minute change in the parameters are monitored using an intelligent control method named Fuzzy based monitoring system. In this monitoring system, induction motor drive is adopted with a direct torque control method to avoid the usual torque ripples present in the system. Thisintelligent fault monitoring system is used to take corrective measures within a specified time when the drive is implemented in an electric vehicle applications.

High-Performance Computing Using FPGAs for Improving the DTC Performances of Induction Motors

2020 ◽  
pp. 133-153
Author(s):  
Saber Krim ◽  
Mohamed Faouzi Mimouni
Keyword(s):  
Digital Signal Processor ◽  
High Performance ◽  
Induction Motors ◽  
Control Method ◽  
Direct Torque Control ◽  
Digital Signal ◽  
Sampling Frequency ◽  
Torque Control ◽  
Field Programmable ◽  
Torque Ripples

The conventional direct torque control (DTC) of induction motors has become the most used control strategy. This control method is known by its simplicity, fast torque response, and its lack of dependence on machine parameters. Despite the cited advantages, the conventional DTC suffers from several limitations, like the torque ripples. This chapter aims to improve the conventional DTC performances by keeping its advantages. These ripples depend on the hysteresis bandwidth of the torque and the sampling frequency. The conventional DTC limitations can be prevented by increasing the sampling frequency. Nevertheless, the operation with higher sampling frequency is not possible with the software solutions, like the digital signal processor (DSP), due to the serial processing of the implemented algorithm. To overcome the DSP limitations, the field programmable gate array (FPGA) can be chosen as an alternative solution to implement the DTC algorithm with shorter execution time. In this chapter, the FPGA is chosen thanks to its parallel processing.

The Research of Improved Scheme for Asynchronous Motor Direct Torque Control

2012 ◽  
Vol 466-467 ◽  
pp. 819-823
Author(s):  
Di Chen ◽  
Rui Juan Hou ◽  
Jie Li ◽  
Jin Niu Tao
Keyword(s):  
Digital Signal Processor ◽  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Asynchronous Motor ◽  
Direct Torque Control ◽  
Digital Signal ◽  
Torque Control ◽  
Space Vector

This paper proposed a kind of new control method for resolving the problem of the Direct Torque Control (DTC)'s greater torque pulsation problem at low speed, this method is based on Space Vector Pulse Width Modulation (SVPWM). SVPWM is a kind of excellent Pulse Width Modulation (PWM) scheme. It can not only improve the inverter DC voltage utilization, reduce harmonic losses, restrain torque pulsation, also easily generate high-precision real-time waveform by the high-speed digital signal processor. The simulation results of this system by Matlab/Simulink indicate that the space vector PWM direct torque control can efficiently reduce the pulse of motor torque and flux linkage.

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.

scholarly journals DTC Switching Strategy for Open-end Winding of Induction Machines Fed by a Dual-output Indirect Matrix Converter

2021 ◽  
Author(s):  
Abdelkader Beladel ◽  
Abdellah Kouzou ◽  
Mohamed Elbar ◽  
Ahmed Hafaifa
Keyword(s):  
Output Voltage ◽  
Pulse Width Modulation ◽  
Direct Torque Control ◽  
Matrix Converter ◽  
Drive System ◽  
Torque Control ◽  
Current Harmonics ◽  
Common Mode Voltage ◽  
Three Phase ◽  
Open End Winding

This paper deals with the Direct Torque Control (DTC) of Dual Indirect Matrix Converter (DIMC) feeding an open-end winding three-phase Induction Motor (IM). Indeed, the open-end winding topology allows overcoming the main problem of Common-Mode Voltage (CMV) which is responsible of presence of stresses in the motor winding in classical topologies, controlling separately the winding of the three-phases, reducing the voltage stress of the power electronics switches and to decreasing the voltage and current harmonics in each phase. The proposed Dual-output Indirect Matrix Converter generates 18 active voltage space vectors. Whereas, in the proposed algorithm presented in this paper to ensure the control of the proposed topology it is implemented only with two null vectors and six active voltage vectors for each output. It is based on same idea of the space vector pulse width modulation that is applied separately for both converters to ensure the control of their output voltages. Indeed, to ensure the required voltage at each winding the output voltage of the first matrix converter are generated normally and output voltage of the second matrix converter are generated with 180° phase shift. The obtained simulation results prove clearly the overall performance of the control of the studied drive system based on the proposed topology and its control algorithm which may be extended to other drive system application, especially in industrial application where more improved performances are required.

Study on Direct Suspension Force Control of Bearingless Permanent Magnetic Slice Motor

2014 ◽  
Vol 529 ◽  
pp. 529-533
Author(s):  
Ying Yue Gu ◽  
Huang Qiu Zhu ◽  
Run Zhang Zeng
Keyword(s):  
Control System ◽  
Force Control ◽  
Control Algorithm ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Force Control System ◽  
Torque Ripples

The theory of direct torque control of traditional permanent magnet synchronous motor is applied to the radial suspension force control of a BPMSM in this paper.With the integration of the space vector pulse width modulation, a novelty SVPWM direct suspension force control system for the BPMSM is constructed.On the basis of mathematical modeling,the detail control algorithm is deduced.Then the control system is simulated with Matalab/Simulink,and the results show that the control algorithm is simplified and the torque ripples are restrained，fine static and dynamic performance is brought to the motor.

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.

Study on Direct Torque Control Applied in the Electrical Propulsion Ship

2011 ◽  
Vol 354-355 ◽  
pp. 1252-1256
Author(s):  
You Tao Zhao ◽  
Yan Cheng Liu ◽  
Jun Jie Ren
Keyword(s):  
Electric Propulsion ◽  
Control Method ◽  
Direct Torque Control ◽  
Torque Control ◽  
Regulation System ◽  
Propulsion Systems ◽  
Speed Regulation ◽  
Imple Mentation ◽  
Electrical Propulsion ◽  
Simulation Results

With the development of AC (alternating current )technique, larger power PMSM ( permanent m- agnet synchronous motor ) has been applied in the marine electric propulsion systems. In this paper the imple- mentation of the DTC (direct torque control) systems for a variable-speed 4088kW PMSM in ship electric propulsion systems has been studied. A novel control method using SVPWM (space vector pulse width mo- dulation) was proposed and a SVPWM module was designed. Then a DTC – SVPWM simulation model of PMSM with the load of propeller was found. The simulation results shows that the variable frequency speed regulation system have good response performance in the process of the motor start or speedup and through comparing the simulation results with the experiment data of the PMSM, the validity of the model is verified.

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