Micro-hydro generator schemes are an attractive choice for electricity generation in remote locations or underdeveloped communities where a grid supply is not available. Since such systems must be low cost, reliable, and robust to minimise maintenance requirements, the use of a standard squirrel cage induction motor is appealing – either three phase or single phase depending on power ratings an...

The conventional speed controllers for vector controlled induction motor drive(VC1MD) suffer from the problem of stability, besides, these controllers show either steady state error (PD controller) or sluggish response (Pi, PID) to the perturbation in reference setting or during load perturbation. This paper presents a fuzzy logic based speed controller and its design for vector controlled indu...

The squirrel cage induction motor direct torque control main problems due to and large stator flux pulsation. In this an improved model predictive algorithm considering multi-step delay compensation is proposed. At each sampling moment, predict the linkage at next moment under voltage vector. optimal vector deviation from reference value are selected as minimum objective function. Aiming proble...

This article presents a comparative analysis of the direct torque control with space vector modulation method for seven-phase squirrel-cage induction motor during encoder failure. The model reference adaptive system current and estimator system—flux based applied in loop speed have been analyzed. mathematical system-type estimators described. to voltage source inverter, controlled motor, has op...

Analysis of broken rotor bars in large induction motors Projeto acadêmico sem fins lucrativos desenvolvido no âmbito da iniciativa Acesso Aberto Artigos 407 A new technique to detect broken rotor bars, in large squirrel-cage induction motors is presented. In order to avoid problems in industrial applications, the electromagnetic behavior of induction machines with rotor faults was examined, by ...

Brushless Doubly-Fed Machine has attracted considerable attention in recent years due to its advantages. It has the robustness of the squirrel cage induction machine, and the speed and power factor controllability of the synchronous machine as well as the absence of brushes and slip rings, and using a fractionally rated frequency converter. Hence, there are considerable benefits over the conven...

Rotor and stator temperature are of concern in both shortterm machine protection and in longer term condition monitoring for large induction machines. Especially, when operating with overload cycles, it is necessary to monitor rotor bars and stator winding temperatures to make sure that the temperature remains below prescribed limits. The purpose of this paper is to present a thermal monitoring...