Variable-reluctance (VR) or switched-reluctance (SR) motors also can operate as brushless dc motors. VR motors have salient poles on a soft-iron rotor. Motor action results from interaction between the rotor poles and a rotating field set up by the stator windings. The construction yields high torque-to-inertia ratios.

VR motors cost less than corresponding permanent-magnet brushless types. And because VR types call for unidirectional current, amplifiers for them cost less than those for conventional types. The motors are increasingly used ....etc

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related topics for basics of pmdc motor ....etc

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ULTRA SONIC motor is a newly developed motor, and it has excellent performance and many useful features, e.g.: high-torque density, low speed, compactness in size, no electromagnetic interferences, and so on. USM is a kind of piezo motor. The proposed speed control scheme is assumed for these applications because they require quick and precise speed control of actuators for various load conditions. A speed control method of USM using adaptive control is proposed.
Artificial Neural Network (ANN), which follows the biological neural cells in bra ....etc

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related topics for pmdc motor ....etc

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Today, home appliance applications require more and more features such as motor speed adaptations to multipurpose accessories, user-friendly interfaces, and security features. Such new requirements can be achieved through a low-end microcontroller-based electronic control using the fuzzy logic approach. Now a days, most of fuzzy logic-based controls are only limited to a complicated ranking management of user interfaces, sensors, and actuators, corresponding to slow software speed operation. This paper proposes a totally different use of fuzzy ....etc

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Electronic motor speed controllers first appeared during the 1980s and many were based on dedicated integrated circuits originally designed as a servo controllers. However, with suitable circuit modifications, these ICs could also be used as the basis for a simple electronic speed controller. Since that time a number of significant events have occurred:- ? The workhorses of many older electronic motor speed controller designs, the tried and tested ZN409 and ZN419 servo amplifier ICs, have been made obsolete. ? MOSFET technology has developed an ....etc

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INTRODUCTION
Man is an ambitious creator. He has conquered the world of science and has reached to this 21ST century. In pre-cuts of perfection. He has cared much for automation and product quality which is directly co related to electronics.
In this fact developing society, electronic has come to stay as the most important branch of Engineering. Electronic devices are being used in almost all the industries for quality control and automation. They have become a fast replacement of present workers army which is engage ....etc

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This project explains how to control and run a stepper motor through computer interfacing. The circuit incorporates a small high quality stepper motor combined with a series of driver IC to enable AT89C51 microcontroller of the stepper motor. stepper motor comes together with LCD indication for change in speed and direction of rotation.
This is the project report which will help you in making this project. Its presentation will be published soon. so Keep visiting

http://ziddudownload/4463450/MOTORCONTROL.doc.html
http://slidesharepawan200 ....etc

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1. The Sardar Sarovar project is located in
(A)Gujarat(B) Uttar Pradesh
(C ) Orissa(D) Madhya Pradesh

2. Which ministry conducts the decennial census in India?
(A)Ministry of Rural Development
(B)Ministry of Human Resource Development
(C )Ministry of Home Affairs
(D)Ministry of External Affairs

3. Who was the President of Indian National Congress when ‘Poorna Swaraj’ resolution was passed? 
(A) Motilal Nehru(B)Subash Chandra BoseSubash Chandra Bose
(C ) Gandhiji(D)Jawaharlal Nehru

4.Kolar mines in Karnat ....etc

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A special type of brushless motor is called a limited-angle torquer (LAT). LATs are constrained to produce torque through a rotation angle of less than 180 degree, But they are widely used to operate servovalves, direct laser mirrors, position missile-guidance radar antennas, open shutters for heat-seeking sensors, and power other systems that rotate through small angles.

The rotor in a limited-angle torquer carries field magnets, and the stator supports armature windings (similar to the construction of conventional brushless motors). LATs, ....etc

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