The paper presents a synthesis of an extended Gopinath observer (EGO) and analyzes the asymptotic stability of a squirrel-cage induction motor vector control system with an EGO in its loop. The considered control system is based on the direct rotor flux orientation method (DFOC) and the study of stability is based upon the linearization theorem applied around the equilibrium points of the contr...

This paper presents a different technique for the online stator resistance estimation using particle swarm optimization (PSO) based algorithm rotor flux oriented control schemes of induction motor drives without speed sensor. First, conventional proportional-integral controller-based is used sensorless scheme with two model reference adaptive system (MRAS) concepts. Finally, novel method on PSO...

in this paper, the design and implementation of adaptive speed controller for a sensorless synchronous reluctance motor (synrm) drive system is proposed. a combination of well-known adaptive input-output feedback linearization (aiofl) and adaptive backstepping (abs) techniques are used for speed tracking control of synrm. the aiofl controller is capable of estimating motor two-axis inductances ...

In this paper, a novel rotor position estimation method for Brushless Permanent Magnet AC motors are described. The algorithm developed here relies on the phase voltages and the currents of the motor drive, which are both reconstructed from the measured DC link current and the switching control signals of the inverter. The paper reports the first phase of the research work, and provides various...

In general, the conventional techniques like loop impedance and nodal admittance methods are used to find the parameters of SEIG for finding performance under various conditions. In these approaches, long mathematical calculations are involved. With the recent development, ANN and fuzzy logic are used for finding various parameters for different values of machine parameters. By finding these pa...

The proportional relationships between the Charpy absorbed energy (CVN) and the KIC values have been established for a wide variety of steels. Several formulae have been proposed that predict KIC from CVN. The purpose of this study is to investigate, by means of compact testing fracture toughness specimens, the effective role of microstructure for estimation of the fractur...

Induction motors are the most commonly used in the traction industries and electric vehicles, due to their low primary cost, low maintenance costs, and good performance. Speed identification is needed for the induction motor drives. However, using of speed sensors in the induction motor drives is associated with problems such as, extra cost, reduced reliability, added mounting space, etc.. Ther...

Field winding temperature of the synchronous generator is one limiting factors shaping PQ capability curve. Therefore great operational importance to have information about this estimated with utmost accuracy. It can be measured directly using built-in sensors or determined indirectly. With increasing penetration renewable energy sources into high-voltage transmission system, fundamental change...

Inductance profile has an important bearing on the performance of a Switched Reluctance Motor (SRM) This paper presents the results of a frequency respolse method to estimate the inductance profde of SRMs. Stator winding is energized by a variable voltage variable Frequency supply. An approximate equivalent circuit incorporating stator resistance, winding inductance and loss component has been ...

This thesis presents a new method for the real-time estimation of the parameters and fluxes of induction motors. Such a procedure is useful for the design of self-commissioning drives, i.e., drives that can adjust controller parameters automatically for a wide range of motors and loads. Another potential application is for the diagnostic of failures. In their recursive form, the algorithms can ...