STEPLESS SPEED DRIVES &CONTINUOUSLY VARIABLE TRANSMISSION (CVT)
INTRODUCTION
A continuously variable transmission (CVT) is a transmission that can change steplessly through an infinite number of effective gear ratios between maximum and minimum values.
This contrasts with other mechanical transmissions that offer a fixed number of gear ratios.
The flexibility of a CVT allows the driving shaft to maintain a constant angular velocity over a range of output velocities.
ADVANTAGES
This can provide better ef ....etc

[:=Read Full Message Here=:]

pleasre give a ppt on speed control of ac drives using scr.. ....etc

[:=Read Full Message Here=:]

SPEED CONTROL OF SYNCHRONOUS MOTOR BY USING VARIABLE FREQUENCY DRIVES



ABSTRACT :

A novel open-loop speed control method for induction motors that provides high output torque and nearly zero steady-state speed error at any frequency is presented. The control scheme is based on the popular constant volts per hertz (V/f) method using low-cost open-loop current sensors. Only stator current measurements are needed to compensate for both stator resistance d ....etc

[:=Read Full Message Here=:]

difference between chopper fed drives and converter fed drives pdf ....etc

[:=Read Full Message Here=:]

Abstract
This paper presents a new technique for online identificationof an induction motor rotor time constant. The techniqueis designed for a shaft-sensorless indirect field-oriented controlinduction motor drive with a model reference adaptive system(MRAS)-based speed estimator. The MRAS estimator is sensitiveto the changes in the rotor time constant, and online identificationof that parameter is essential. If rotor parameter error exists, itdoes not only change the achieved rotor speed, but it also changesthe dynamic behavior of the ....etc

[:=Read Full Message Here=:]

Simona Coman1, V. Comnac1, Member IEEE, Cr. Boldisor1, D.C. Dumitrache2
1Automation Department, “Transilvania” University of Brasov, 5 M.Viteazu Str.,
500174 Brasov, Romania, phone/fax: +40 0268 418836,
2 Department of Automatic Control, Technical University of Cluj-Napoca,
26-28 Gh. Baritiu Str., 400027 Cluj-Napoca, Romania



Abstract –

The distributed control systems with communication
networks are used in many industrial applications. These systems
are often re ....etc

[:=Read Full Message Here=:]

Every kW of energy saved is as good as same amount of energy generated. Such is the scarcity of energy in India. Energy can be saved by using Variable Speed Drives (VSD) for applications like Pumps and Fans. Employing conventional techniques, which uses a motor running at full speed and flow pressure being created by throttle valve, a lot of energy is wasted due to electric, thermal and mechanical losses. By replacing conventional arrangement with AC drives, tremendous amount of energy can be saved. However, traditional approach to flow control ....etc

[:=Read Full Message Here=:]

SPEED CONTROL OF SYNCHRONOUS MOTOR BY USING VARIABLE FREQUENCY DRIVES



ABSTRACT :

A novel open-loop speed control method for induction motors that provides high output torque and nearly zero steady-state speed error at any frequency is presented. The control scheme is based on the popular constant volts per hertz (V/f) method using low-cost open-loop current sensors. Only stator current measurements are needed to compensate for both stator resista ....etc

[:=Read Full Message Here=:]

CHAIN DRIVES IN LOW TORQUE DRIVES AND REDUCING PULSATIONS
INTRODUCTION TO DRIVES

Mechanical components used for power transmission.It may be belt, chain or gear depending on engine design parameters like - Distance between crankshaft and camshaft, engine maximum speed, engine-torque and engine construction cost.- Power transmission is done from one shaft to another shaft which may or may not rotate at same spe ....etc

[:=Read Full Message Here=:]

i want ppt for z source inverter for adjustable speed drives ....etc

[:=Read Full Message Here=:]