Skip to main content

Posts

STEADY STATE MODEL OF AN INDUCTION MACHINE

 
Post a Comment
Read more

AC SERVO MOTOR

 AC SERVO MOTOR WHAT IS A SERVO MOTOR ? Servo Motor is also known as a Control Motor. They are used in Feedback Control Systems but not used for continuous energy conversion. The Principle of Servo Motor is similar to that of other electromagnetic Motors but the Construction and Operation are different. Power rating varies from fraction of watt to hundreds of watts. BLOCK DIAGRAM OF AC SERVO MOTOR Like wise in all other control systems,the input is passed through the Amplifier and then through the Servo Motor and if the output obtained is desirable the there is not use of the feedback loop. If the output Obtained is not desirable then the error in the output is fed back to the error detector and then through the Amplifier,as the error is very minute it is to be amplified and the given to the Servo motor. CLASSIFICATION OF SERVO MOTORS AC SERVO MOTOR CONSTRUCTION                (i)Stator (ii) Rotor Stator has two Distributed Windings with a di...
Post a Comment
Read more

RECTIFIER CIRCUIT FOR LED APPLICATIONS

LED DRIVER CIRCUIT Light Emitting Diode is a special kind of diode that emits energy in the visible band of the electromagnetic spectrum. However, it conducts in forward bias the same as the p-n junction diode. It is used as an  optoelectronic  device.  Now let me ask you a simple question. At our home we get 230 volts AC supply, can we give this directly to an LED? The answer should be Of course not. This is because an LED needs a constant current input. Thus to serve this purpose, we need a driver circuit.  what is OPTOELECTRONICS ? It is a branch of Technology which deals with the combined use of Electronics and Light DESIGN OF LED DRIVER CIRCUIT To the main supply, an AC capacitor is connected in a line with the mains supply. Then, a resistor of 390k ohm is connected in parallel with this capacitor. This is to discharge the capacitor in the absence of supply. One more resistor of 10Ω is connected between the mains supply and the rectifier which can be called fuse...
Post a Comment
Read more

WHAT'S INSIDE A CABLE🤔

Cable: Cables are generally used for the Transmission and Distribution of Electric Power inspite of its numerous Advantages.The type of cable used will depend upon the Voltage and Service requirements.                    The Underground cable used for Transmission of power at high voltage consists of on central core or a number of cores(two,three or four) of tinned stranded copper conductors(sometimes use of Aluminium conductors is also made) insulated from each other by paper or varnished Cambric or vulcanised Bitumen or impregnated paper. Cable A Metallic sheath of lead or alloy of Aluminium is provided around the insulation to protect it against ingress of moisture.For the protection of metallic sheath against corrosion and from mechanical injury from the armouring a layer of bedding consisting of paper tape compounded with a fibrous material is provided over the metallic sheath.Also sometimes jute strands or hessian tape ...
Post a Comment
Read more

CORONA

Corona: When an Alternating Potential Difference is applied across two conductors,whose spacing is large in comparison with the diameter,then the atmospheric air surrounding the conductors is subjected to electrostatic stresses.At low voltage there is no change in the condition of atmospheric air around the conductor.However,when the potential difference is gradually increased,a stage arrives when a faint luminous glow is violet colour appears together with a hissing noise.This phenomenon is called VISUAL CORONA and is accompanied by the production of OZONE which is readily detected because of its characteristic odour.The glow is due to the fact that the atmospheric air around the conductor becomes conducting due to electrostatic stresses. DISCHARGE OF CORONA                      If the potential difference is raised still further,the glow and the noise will increase in intensity until eventually a spark over will take pla...
Post a Comment
Read more