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This paper proposes a methodology for torque and efficiency estimation of in-service induction motors based on the Air-Gap Torque (AGT) method. The proposed methodology only relies on induction motor stator voltages, currents and nameplate data. A modified stator resistance is estimated including the mechanical losses effect. This modified stator resistance is estimated by using a Differential Evolution...
A method for estimating induction motor's rotor speed is proposed in this paper. The proposed rotor speed estimation method is based on model reference adaptive identification theory. By applying the proposed rotor speed estimation method, the induction motor control system can simultaneously estimate the stator resistance and the rotor speed of the induction motor. The proposed speed sensorless control...
This work proposes an air-gap torque (AGT) based method for efficiency and torque estimation of induction motors. A new concept of stator resistance including the mechanical losses effect is presented. This modified stator resistance is estimated through a Particle Swarm Optimization (PSO) approach. The proposed methodology only relies on line currents, line voltages and nameplate data, which is appropriate...
This work proposes a methodology for induction motor torque estimation based on the stator flux model. The presented methodology just relies on line voltages, line currents and nameplate data; and it adopts a modified stator resistance, which already comprises the mechanical losses effect. This modified stator resistance is estimated through a Particle Swarm Optimization (PSO) algorithm, which is...
In this paper, a detailed study of the performance of rotor flux and reactive power based MRAS rotor resistance estimators for Vector Controlled Induction Motor drive is presented. The rotor resistance changes significantly during operation of the drive due to temperature rise and saturation. This variation has a major influence on the performance of the field oriented control of induction motor drive...
Accuracy of flux amplitude and phase is critical to field-oriented control [1]. The estimation of rotor flux is easily affected by rotor time constant and compensation terms are difficult to realize. In this paper, a method based on stator flux oriented is proposed. The stator flux is estimated by integrating motor EMF. The phase voltage reconstruction is obtained from DC link and vector time, and...
An accurate estimation of stator resistance is very important especially during operation of an induction motor due to variation in the stator resistance and temperature of the working machine. This paper proposes a Neuro-fuzzy Technique (NFT) for an online estimation of the stator resistance under steady state operating conditions of an induction motor. The proposed technique is compared with the...
The stator inter-turn faults and stator electrical asymmetries such as stator resistance and inductance unbalance generate similar negative sequence current signatures in the induction machine. Hence the stator inter-turn fault is one of the most difficult faults to discriminate and detect in an induction machine. Discrimination of the stator inter-turn fault from stator electrical asymmetry essentially...
A new control strategy of induction motors with stator flux orientation (SFOC) that combines the advantages of both Vector Control and Direct Torque Control is presented. According to the dynamic model of induction motors, stator flux is controlled effectively. Based on the fuzzy logic control theory,the stator resistance estimator is designed to identify stator resistance and on-line compensate....
Direct torque control of induction motor is a kind of high performance of AC drive control method, the method of space vector analysis is the applied, The stator magnetic field, directly on the electromagnetic torque motor stator flux and control. But the change of the stator resistance will affect the performance of direct torque control system when the motor at the low speed This paper describes...
With the development of electrical machines in specific working conditions, the significant increase of power energy losses take place while their thermal capability is constantly decreased. The thermal overheating and cycling degrades the integrity of the materials used for stator winding insulation, resulting in acceleration of thermal aging. A new approach for induction motor temperature monitoring...
AC motors are the main workhorses in process industries. Their malfunction may not only lead to repair or replacement of the motor, but also cause significant financial losses due to unexpected process downtime. Reliable thermal protection of ac motors is crucial for reducing the motor failure rate and prolonging a motor's lifetime. In this paper, conventional thermal protection devices and state-of-the-art...
This paper presents application of adaptive neuro-fuzzy inference system (ANFIS) into a squirrel cage induction machine towards modeling, control and estimation. This paper contributes (i) Development of a simple and more realistic model of the induction motor using ANFIS. Using ANFIS, the parameter sets of the motor model are estimated. The simplified model contains eleven estimated parameters. In...
The paper deals with methods and algorithms for the estimation of the induction motor equivalent circuit parameters starting from the geometrical and electrical data generally available after an electromagnetic design. The main aim of the paper is to help the readers to pass from the theoretical analysis to numerical code suitable to be included in own design software. For this reason, the step-by-step...
This paper implements a new observer model in parallel with a sliding mode concept for a field oriented control drive system. The proposed system accounts for the problem of stator resistance variation. The use of feedback correction on the output of the observer eliminates the effect of stator resistance and makes the new observer robust in terms of motor parameter variation. A comparison between...
A lot of test methods to determine losses of induction motor have been proposed and standardized. Different countries around the world have been collected from those test method. In this paper, the differences among IEC 61972, 34-2 and IEEE 112-methodB are shown and testing results are also compared. The main discrepancies between the various standards are the way of quantification of the stray load...
A remote and sensorless stator winding resistance estimation method for thermal monitoring has been proposed for soft-starter-connected induction motors by the authors. As an continuation of the previous work, this paper specifically focuses on the practical implementation of the proposed method. In this paper, a compensation method for the measurement offsets is introduced to improve the performance...
In this paper, we present a Direct Torque and Flux Control (DTFC) scheme of an induction motor operating with a stator resistance PI estimator. The variation of stator resistance due to changes in temperature or frequency degrades the performance of this control strategy, and therefore is a big issue of DTFC. In order to solve this issue, a method of stator resistance estimation using a proportional-...
This paper presents a new adaptive scheme for online estimation of stator resistance in speed-sensorless induction motor drives. The method is based on the adaptive control theory of model reference adaptive system (MRAS) approach with Luenberger observer. And the stability of the observer with stator resistance estimation in sensorless vector control of induction motors is proved by the Lyapunov's...
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