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Friday, August 14, 2020 | History

2 edition of Enhanced direct torque control for high dynamic performance induction motor drives found in the catalog.

Enhanced direct torque control for high dynamic performance induction motor drives

Ian Gerard Bird

Enhanced direct torque control for high dynamic performance induction motor drives

by Ian Gerard Bird

  • 303 Want to read
  • 15 Currently reading

Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D) - University of Birmingham, School of Electronic and Electrical Engineering, Faculty of Engineering.

Statementby Ian Gerard Bird.
ID Numbers
Open LibraryOL18063455M

Direct torque control (DTC) is one in all the foremost wonderful management methods of torque control of the induction motor. The aim is to regulate effectively the torque and flux. Torque control of associate induction motor (IM) supported DTC strategy is a developed and a comprehensive study which is made during this project. 5 Direct Torque Control of AC Machines Preliminary Remarks Basic Concept and Principles of DTC Basic Concept Principle of DTC DTC of Induction Motor with Ideal Constant Machine Model Ideal Constant Parameter Model of Induction Motors Direct Torque Control Scheme

9 Direct Torque Control (DTC) and Encoderless Operation of Induction Motor Drives Introduction System Overview Principle of Encoderless DTC Operation Calculation of λs, λ r, Tem, and ωm Calculation of the Stator Flux λ s Calculation of the Rotor Flux λ r Direct torque control for induction motor and a power converter suitable for such application such as induction motor control are presented in this paper. Need for direct torque control and principle of DTC is explained in great details. For complete control of motor [6], software program and Simulation has done in Matlab Figure 3.

require higher dynamic performance than v/f control, the dc motor like control of IM, referred to as Field Oriented Control (FOC) is preferred. The main issue of FOC drive is how to obtain the decoupled control of machine flux and torque [4]. An indirect form of FOC is also used in IM drives, used in high performance applications. A new. methodologies for achieving precise speed and torque control of induction motors [17]. For electrical drives good dynamic performance is mandatory so as to respond to the changes in command speed and on of vecort control, revolutionized high performance control of ac drives. With this theory induction motor can be controlled like.


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Enhanced direct torque control for high dynamic performance induction motor drives by Ian Gerard Bird Download PDF EPUB FB2

This chapter presents two advanced control schemes, the field oriented control (FOC) and direct torque control (DTC), for high‐performance induction motor drives.

DTC is one of the advanced control schemes for AC drives. It is characterized by simple control algorithm, easy digital implementation and robust operation.

A sensorless induction motor drive is presented, in which the principles of sliding-mode control, direct torque control (DTC), and space-vector modulation are combined to ensure high-performance. Direct torque control (DTC) is one method used in variable-frequency drives to control the torque (and thus finally the speed) of three-phase AC electric involves calculating an estimate of the motor's magnetic flux and torque based on the measured voltage and current of the motor.

A novel high-performance indirect real and reactive power control (IRRPC) scheme for induction motor (IM) drives is proposed. The IRRPC consists in adjusting the instantaneous real and reactive. This chapter presents control methods for high-performance adjustable-speed drives with induction motors by direct selection of consecutive states of the inverter.

The chapter explains direct torque control (DTC) technique, direct self-control technique, and an enhanced version of the DTC scheme, employing the space-vector pulse width. Direct torque control (DTC) for motor drive applications has been well established in both academia and industry.

It offers a simple control structure, fast response, and robust operation [35].The torque and flux references are tracked using hysteresis controllers and a switching table implemented with LUT is used for selecting the optimum converter's output.

Abstract: Model predictive torque control (MPTC) is emerging as a high-performance control strategy for induction motor (IM) drives, due to its intuitive nature, flexibility to incorporate constraints and quick dynamic response. However, the implementation of MPTC requires high computational ability and the use of single voltage vector during one control period fails to reduce the torque.

10 Direct torque control | Technical guide No. 1 A DC machine is able to produce a torque that is: – Direct - the motor torque is proportional to the armture current: the torque can thus be controlled directly and accurately. – Rapid - torque control is fast; the drive system can have a very high dynamic speed response.

Torque can be. control is one form of the hysteresis or bang-bang control. Direct Torque Control of inverter-fed Induction Machine allows high dynamic performance by means of very simple control schemes.

Figure 1: Schematic for Direct Torque Control DTC might be preferred for high dynamic applications, but, on the other hand, shows higher current and torque.

All these control methods are termed as scalar control of an induction motor and with these the cage motor exhibits inferior dynamic performance as compared to the separately excited de motor. In their efforts to have a maintenance free, robust and high performance ac drive, the researcher wanted to realize separately excited dc motor.

Using VSDs with direct torque control increases motor torque response dramatically. The performance of asynchronous AC motors in today’s applications comes from modern electronic controls such as variable-speed drives (VSDs) and accurate motor models whose sophisticated control algorithms can be executed rapidly by high-performance digital signal processors.

Electric motors. When using an induction motor in industrial drives with high performance demands, the induction motors are non linear high order systems of considerable complexity [1]. The advancement of power electronics had made it possible to vary the frequency of the voltage or current relatively easy using various control techniques and thus.

Speed control of induction motor drives using direct torque control (DTC) method have become increasingly popular in the industrial drives due to the simplicity in control structure and high dynamic performance of instantaneous electromagnetic torque.

Since DTC. Conventional direct torque control (DTC) is one of the excellent control strategies available to control the torque of the induction machine (IM). However, the low switching frequency of the DTC causes high ripples in the flux and torque that leads to an acoustic noise which degrades the control performances, especially at low speeds.

Many direct torque control techniques were. DIRECT TORQUE CONTROL INDUCTION MOTOR DRIVES This method made the motor more accurate and fast torque control, high dynamic speed response and simple to control.

This report presents a principle of the DTC; switching table, and selection of the amplitude of the hysteresis band of torque and flux. The basic dynamic performance of DTC is. Abstract: Direct torque control (DTC) is an emerging technique for controlling PWM inverter-fed induction motor (IM) drives.

It allows the precise and quick control of the IM flux and torque without calling for complex control algorithms. In principle, moreover. Direct torque Control (DTC) and Field-oriented Control (FOC) are the two most widely used control techniques for induction motor drives for high performance applications.

Each control technique has its own advantages and drawbacks. In general, the choice between the two depends on the requirements of the applications. Description. The DTC Induction Motor Drive (AC4) block represents an improved scalar control drive for induction motors with direct torque and flux control.

This drive features closed-loop speed control using hysteresis-band torque and flux controllers. The speed control loop outputs the reference electromagnetic torque and stator flux of the machine.

Earlier dc motors were the only drives that were used in industries requiring - eration over a wide range of speed with step less variation, or requiring fine ac- racy of speed control. Such drives are known as high performance drives. AC - tors because of being highly coupled non-linear devices can not provide fast dynamic response with normal.

Direct Torque Control of inverter-fed Induction Machine allows high dynamic performance by means of very simple control schemes. In this paper various direct torque control methodologies as conventional DTC (C_DTC), modified DTC (M_DTC) and twelve.

Torque Ripple Reduction Based Direct Torque Control for Induction Motor Drive. Abstract—Direct Torque Control is a control technique used in AC drive systems to obtain high performance torque control.

In this paper, Proportional-Integral (PI) controller has been presented to improve the system performance which gives better.In this paper, a new efficiency-optimized space-vector-modulation direct torque control (DTC) scheme is proposed and implemented for induction motor drives.

Different from the traditional DTC, in which the flux linkage reference value is set as the rated value, the flux linkage reference value in the proposed DTC is online updated according to the instantaneous load torque and rotational speed.Direct torque control.

The torque generated in the rotor of a 3-phase induction motor is proportional to the flux generated by each stator pole, the rotor current and the power factor of the rotor. Direct torque control (DTC) is a technique used in variable frequency drives.

It comes from estimating the magnetic flux from the voltage and.