Stator and rotor flux based deadbeat direct torque control of induction machines

Stator and rotor flux based deadbeat direct torque control of induction machines by Barbara H. Kenny Download PDF EPUB FB2

An alternative method of DTC is based on the deadbeat (in-verse) solution to the machine equations [4]–[7]. The deadbeat solution is similar to theclassical DTC methodin that it controls torque and stator flux directly, without an intermediate current loop. It is different, however, in the calculation of the voltage vector to be applied to the machine.

Abstrac_--A new, Stator and rotor flux based deadbeat direct torque control of induction machines book type of direct torque control is proposed, analyzed and experimentally verified in this paper. The control is based on stator and rotor flux as state variables. This choice of state variables allows a graphical representation which is transparent and insightful.

The graphical solution shows the effects of realistic considerations such as voltage and current limits. Stator- and rotor-flux-based deadbeat direct Stator and rotor flux based deadbeat direct torque control of induction machines book control of induction machines Abstract: A new deadbeat type of direct torque control (DTC) is proposed, analyzed, and experimentally verified in this paper.

The control is based on stator and rotor flux as state by: A new deadbeat type of direct torque control is proposed, analyzed and experimentally verified in this paper. The control is based on stator and rotor flux as state variables.

This choice of state. Stator-Flux-Based Vector Control of Induction Machines in Magnetic Saturation Heath Hofmann, Student Member, IEEE, Seth R. Sanders, Member, IEEE, and Charles R. Sullivan, Member, IEEE Abstract— In many variable-torque applications of induction machines, it is desirable to operate the machine at high Stator and rotor flux based deadbeat direct torque control of induction machines book Size: KB.

This paper presents a discrete time deadbeat-direct torque and flux controller (DB-DTFC) for interior permanent magnet synchronous machines (IPMSMs). A Gopinath-style discrete time flux linkage observer is developed which contains two different flux estimation methods based on current and voltage models for flux Stator and rotor flux based deadbeat direct torque control of induction machines book.

This observer produces correctly estimated flux linkages needed for. direct torque control method based on the stator flux correction.

The method is extension of our previous work presented in [11, 12]. The method reveals all characteristics of the basic DTC method but it insures stable and reliable operation in the whole speed region, including start-up from stand-still. The modification of the stator flux is madeAuthor: Dubravko Krušelj, Josip Ungarov, Vladimir Siladi.

Abstract: Dead-beat, direct torque (and flux) control of an induction machine is experimentally achieved at a 10 kHz sampling frequency.

The inverse solution utilized lends itself to a very insightful graphical representation. This allows for an objective experimental evaluation of voltage vector choices in the operational voltage limits. An improved method and prior methods of deadbeat direct torque control involve the use of pulse-width modulation (PWM) of applied voltages.

The prior methods are based on the use of stator flux and stator current as state variables, leading to mathematical solutions of control equations in forms that do not lend themselves to clear. When a load is applied to the rotor of an induction motor, the rotor speed decreases and as a result, the induced currents in the rotor and the torque produced increases due to the relative speed difference between the rotor and the rotating field within the stator.

A new, deadbeat type of direct torque control is proposed, analyzed and experimentally verified in this paper. The control is based on stator and rotor flux as state variables. This choice of state variables allows a graphical representation which is transparent and : Barbara H.

Kenny and Robert D. Lorenz. A stator flux oriented induction motor (IM) drives with deadbeat torque and flux control is proposed in this paper as high performances IM drives.

This algorithm calculates the voltage vector necessary to be generated to the converter in order to eliminate the flux and the torque errors with the advantage of unnecessary intermediate current Cited by: 1. Get this from a library. Stator and rotor flux based deadbeat direct torque control of induction machines.

[Barbara H Kenny; Robert D Lorenz; NASA Glenn Research Center.]. This paper proposes a deadbeat controller applied to direct torque control strategy for a three-phase induction motor.

The deadbeat control method uses the discretized dynamic model of the machine to calculate the theoretical stator voltage vector required to reach the references of torque and flux in a single switching by: 1.

The main objective of the control strategy proposed for DFIG [] in this chapter is to eliminate the necessity of the crowbar protection [] when low voltage dipsby using Direct Torque Control (DTC), with a proper rotor flux generation control strategy, during the fault it is possible to maintain the machine connected to the grid [3, 4], generating power from the wind, reducing Author: Gopala Venu Madhav, Y.

Obulesu. The transient analysis of both three-phase and single-phase induction motors as well as that of the double-cage motors are developed. The principles of such modern control methods as Fiel-Oriented Control, Direct Torque Control and Computed Charges Cited by: measured torque and stator flux values.

The variation in speed and according to flux and torque controllers hysteresis bandwidth, the inverter switching frequency is changed [4]. The DTC aims to choose the best voltage vector in order to control both stator flux and electromagnetic torque of machine : Hayder S.

Hameed, Hanan Mikhael Dawood, J. Alwash. possible to control directly the stator flux and the torque by selecting the appropriate inverter state [46, 54]. DTC main features are direct control of flux and torque, indirect control of stator currents and voltages, approximately sinusoidal stator fluxes and stator currents, and High dynamic performance even at stand still [53, 54].File Size: KB.

The control scheme of the proposed drive system is a stator-flux-oriented control system [10]. The stator-flux-oriented con-trol of an induction motor is used more in industrial variable-speed drive systems because stator-flux estimation accuracy is dependent only on the stator File Size: KB.

Voltage model is commonly used in direct torque control (DTC) for flux observing of asynchronous motor. In order to improve low-speed and dynamic performance of the voltage model, a modified low-pass filter (LPF) algorithm is proposed.

Firstly, the tracking differentiator is brought in to modulate the measured stator current, which suppresses the measurement noise, and then amplitude and phase Cited by: 5. The direct torque control system requires an estimate of the stator flux and the torque for the hysteresis comparators, and an estimate of rotor speed for the speed controller.

These are derived from a model based estimator using the motor currents and an estimate of the motor voltages from the switching table state and the inverter d.c.

input. This paper presents a new torque control algorithm for induction motors, based on the stator flux vector control. For each sampling period, the value of the stator voltage is calculated to keep the stator flux equal to the reference vector, while the stator flux reference vector is calculated to keep the rotor flux amplitude constant at all operating : Djordje Stojic, Slobodan Vukosavic.

An alternative method of direct torque control is based on the deadbeat (inverse) solution to the machine equations []. The deadbeat solution is similar to the classical direct torque control method in that it controls torque and stator flux directly, without an intermediate current loop.

It is different. Papers [4]-[6] present three different SFVC schemes, proving that the direct linear control of torque and stator flux vector enables fast torque dynamics, improved stator flux estimation at low speeds, and ripple free drive operation. The common drawback of these SFVC algorithms is that they rely on the calculation of the field.

precise and quick control of the motor flux and torque, and ii) reduction of the complexity of the algorithms involved in a FOC. A new technique for the torque control of induction motors was developed and presented by I. Takahashi as Direct Torque Control (DTC) [1–3], and by M.

Depenbrock as Direct Self Control (DSC) [4–6]. Ψr, ψs- rotor and stator flux vectors. Keywords: Induction motor, observer, predictive current control, predictive torque control, sensorless drive. Introduction The induction motor is the most widely used electrical motor in industrial applications.

The majority of induction machines are used in constant speed drives, but during the. 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 by: 4.

West and R. Lorenz, “Digital implementation of stator and rotor flux-linkage observers and a stator-current observer for deadbeat direct torque control of induction machines,” IEEE Transactions on Industry Applications, vol. 45, no. 2, pp. –, View at: Publisher Site | Google ScholarAuthor: Andrea Rossi, Carlo Concari.

DIRECT TORQUE CONTROL (DTC) abandons the stator current control philosophy, characteristic of field oriented control (FOC) and achieves bang bang torque and flux control by directly modifying the stator voltage in accordance with the torque and flux errors. So, it presents a good tracking for both electromagnetic torque and stator flux [1].

DTC is. Direct torque control based on space vector modulation (DTC-SVM) preserve DTC transient merits, furthermore, produce better quality steady-state performance in a wide speed range.

At each cycle period, SVM technique is used to obtain the reference voltage space vector to exactl y compensate the flux and torque errors.

A new, deadbeat type of direct torque control is proposed, analyzed, and experimentally verified in this paper. The control is based on stator and rotor flux as state variables. This choice of state variables allows a graphical representation which is transparent and : Robert D.

Lorenz and Barbara H. Kenny. 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.

Keywords: Direct torque control, Induction motor drive, Space vector modulation, Switching table. Introduction In early days dc machine played an important role in variable speed drives applications since the magnetic flux and torque can be easily controlled independently by the stator and rotor.

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 ripple to the Cited by: Rr and Rs: Rotor and stator resistance referred to the stator.

Lr and Ls: Rotor and stator inductance referred to the stator. Lm: Mutual inductance referred to the stator. J: Moment of inertia. B: Coefficient of frictions.

In vector control, the rotor flux in the q-axis is set equal to. [12] Barbara H. Kenny, Robert D. Lorenz, "Stator and Rotor Flux Based Deadbeat Direct Torque Control of Induction Machines", IEEE Transactions on Industrial Electronics, Vol, No.4, [13] Thomas G.

Habetler, Francesco Profumo, Michel Pastorelli: "Direct Torque Control of Induction Machines Over a Wide Speed Range", IEEE-IAS Annual. Direct torque control of three Phase induction motor using matlab Narender Kumar1, Direct Torque Control of induction motor has increasingly become the best alternative to Field-Oriented Control methods.

The performance of an induction motor under the classical Direct Torque Control method and between the stator and rotor flux vectors. -this field across the air gap between stator and rotor and cut the rotor conductors which as yet are stationary. -due to the relative speed between the rotating flux and stationary conductors, an E.m.f induced in the rotor according to Faraday's law.

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 Cited by: 4. Stator current has two components one is related to core magnetisation in order to create the rotating mmf and keeps constant along the whole cycle, the other is a straight conversion of rotor currents through the mutual inductance, initial rotor.

A pdf estimation scheme based on pdf particle swarm optimization algorithm flux observer is proposed for a sensorless rotor field direct orientation controlled induction motor drive. The stator current and rotor flux was used to establish both the rotor field direct orientation controlled induction motor drive and the rotor-flux : Yung-Chang Luo, Wei-An Huang.download pdf rotor flux observer based on the rotor flux dynamic equation.

In the second design method a steady-state solution of the torque-flux model is calculated as a feedforward part of the control. In comparison with the first method the scheme is simpler and has better robustness to the cur- rent noise.Ebook induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding.

An induction motor can therefore be made without electrical connections to the rotor.