what is Eddy current loss ? define || example of Eddy current loss

Eddy current loss

At the point when a rotating attractive field is applied to an attractive material, an emf is prompted in the actual material as indicated by Faraday's Law of Electromagnetic acceptance. Since the attractive material is a leading material, these EMFs flow current inside the body of the material.

As these flows are not answerable for accomplishing any helpful work, and it creates a misfortune (I2R misfortune) in the attractive material known as an Eddy Current Loss. Like hysteresis misfortune, swirl current misfortune additionally builds the temperature of the attractive material.

The hysteresis and the vortex current misfortunes in an attractive material are additionally known by the name iron misfortunes or center misfortunes or attractive misfortunes.

It is hard to decide the swirl current misfortune from the obstruction and current qualities, however by the analyses, the whirlpool current influence misfortune in an attractive material.

Ke – co-proficient of vortex current. Its worth relies on the idea of attractive material

Bm – greatest worth of motion thickness in wb/m2

T – thickness of cover in meters

F – recurrence of inversion of the attractive field in Hz

V – volume of attractive material in m3

This is about Eddy Current misfortune.

Comments

air preheater in thermal power plant - function , construction , working ,advantage , disadvantage

definition of air preheater air preheater increase the temperature of the air. It is most commonly used in thermal power plant. And it is increase the efficiency of the boiler. Working of air preheaters (APH) 1. The hot fuel gas from the economist first enters the air preheater. Then those gases go through the tube to the chimney. The air mass then enters the preheater through the air inlet. 2. Then both air and fuel gas flow in opposite directions. 3. baffles are provided in the air preheater to provide more time for exchanging heat from fuel gas to air 4. thus heat is absorbed by the air from the fuel gas. 5. this preheater air is supplied to the furnace. construction 1. A tubular type air preheater is a large number of tube . 2. the fuel gas pass through the tube. 3. air flows over the tube. 4. baffles are provided to pass the air b number of time over the tube. 5. a soot hopper is provided at the bottom to collect the soo...

Strain gauge || what is strain gauge ? || Working principle of strain gauge || Example-types of strain gauge

what is strain gauge ? A string gauge is a sensor which whose resistance varies with applied force.it converts force, pressure, tension weight e.t.c in to a Electrical resistance which can then be measured like pizo resistive transducer. Working principle of strain gauge : As we applied forced to extend the length of gauge it's cross section area must reduce becouse volume of material remain constant. Then strain gauge is connected to a balanced whiston bridge but as force is applied on gauge resistance change and bridge becomes unbalanced producing V0 Gauge factor Gf=1+2Y Y= paison ratio Using gauge factor we determined change in resistance to the modify resistance and then using Wheaton bridge V0 Examples : Gauge factor in semiconductor is 120 Gauge factor in Ni=12 Gauge factor in co=4.9 Gauge factor in pt=5.2 C=10 types of strain gauge 1. Straight strain checks. 2. Layer Rosette strain checks....

Construction of silicon control rectifier (SCR)

SCR- silicon control rectifier Construction 1. Anode and cathode region are highly drop where gate as moderately drop and drift layer are lightly drop. 2. SCR can be visualized as too BJT (PNP) and ( n p n) connected together 3. SCR is the minority carrier device and it has three p n junction . Disadvantage of SCR 1. Switching is very least while T-off highest 2. More switching loss 3. More conductivity modulation , least R-oN 4. Minimum oN state drop and minimum conductivity loss # SCR contains three p n junction J1 anode and drift - anode is highly drop , depletion low J2 drift and gate - lightly drop , depletion low J3 gate and cathode - highly drop , depletion low Since there is light dropping on both side of J2 So breakdown voltage is high for junction J2 Reverse blocking Let , Anode is connected to negative terminal of supply which cathode is connected to positive terminal of supply 1. J1 and J2 rev...

Electrical funda

Search This Blog