156 views
in Unit 3 by
Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

1 Answer

0 votes
by
 
Best answer

Hysteresis loss:

Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss and heat and insulation damage. The figure shows the hysteresis loop. if the loop is fat then hysteresis losses will be more and if the hysteresis loop is thin then hysteresis losses will be less. If the coercive force is high hysteresis loop will be fat and if the coercive force is low hysteresis loop will be thin. Hysteresis loss reduces the efficiency. Hysteresis loss cannot be completely removed but it can be reduced by choosing the material with less hysteresis loop area. Because less hysteresis loop area material will have low hysteresis loss.


Hysteresis loss in transformer is given by,

W= Kf (Bm)1.6 watts


image


Eddy current loss:

Eddy current also increases heat in the circuit. The loss due to eddy current is known as eddy current loss. Eddy current is caused due to the alternating current which induced emf and that induced emf produce current this current is called eddy current. 

Suppose a coil is wound on a core. An alternating current is applied to the coil. This alternating current to the coil will produce alternating flux. Now according to Faraday's law of electromagnetic induction, this changing flux will generate induced emf in the core. This induced emf will cause current to flow in the core. This flow of current is called eddy current and the losses due to eddy current are called eddy current loss. Eddy current causes I2R losses means heat. If there is a solid core with less resistance then eddy current will be high. Eddy current reduces the efficiency. Complete removal of eddy current is not possible but it can be reduced.

image

Eddy current can be reduced by using laminated core and by using the material with the high resistivity magnetic material. High resistivity magnetic material like silicon.


Eddy current loss in transformer is given by,

We=Kef2Kf2Bm2watts


Skin effect limitations:


Related questions

1 answer 35 views

In a magnetic material hysteresis loss takes place primarily due to?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 320 views

What is the difference between eddy current and hysteresis loss?

asked Mar 15, 2018 in Electrical Engineering by Quiz
1 answer 84 views

The skin effect in conductors is due to non uniform distribution of current in it and major portion of current is near the _______ of conductor.  (1) Surface (2) Center (3) Complete cross section area (4) Axis

asked Apr 30, 2018 in Power system by Shimroz123
1 answer 32 views

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 36 views

A ferrite core has less eddy current loss than an iron core because?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 31 views

explain skin effect in copper interconnects. what are the various ways of reducing this effect?

asked Dec 13, 2017 in VLSI Design by Quiz
1 answer 25 views

Skin effect occurs when a conductor carries current at_____ frequencies.

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 85 views

Skin effect is absent in which of the following transmission systems? A) Extra High Voltage (EHV) AC B) High Voltage Direct Current (HVDC) C) Both A and B D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 41 views

when the skin effect occurs ?

asked Aug 18, 2017 in Electric Power Transmission by Zeeshan
2 answers 105 views

what is skin effect?

asked Aug 6, 2017 in Electrical Engineering by Zeeshan
1 answer 11 views

State the factors affecting hysteresis loss.

asked Sep 4, 2018 by Shimroz123
1 answer 4 views

Explain magnetic effect employed in measuring instrument.

asked Sep 6, 2018 by Shimroz123
1 answer 32 views

Classify magnetic materials and explain in brief.

asked Sep 4, 2018 by Shimroz123
1 answer 6 views

What is magnetic hysteresis? What is the cause of hysteresis?

asked Sep 4, 2018 by Shimroz123
2 answers 60 views

Explain the hysteresis loop of a magnetic material with neat diagram.

asked Aug 8, 2018 by Quiz
1 answer 8 views

What is piezoelectric effect? Name two piezoelectric material.

asked Sep 8, 2018 by Shimroz123
1 answer 66 views

The magnetic susceptibility of paramagnetic material is: A) Less than zero B) Less than one but positive C) Greater than one D) Equal to zero

asked Jun 18, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

The property of a material which opposes the creation of magnetic flux in it is known as?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

A material for good magnetic memory should have?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 195 views
0 answers 8 views

How eddy current can be minimized?

asked Mar 15, 2018 in Electrical Engineering by Quiz
0 answers 62 views

How eddy current is produced in a transformer?

asked Mar 15, 2018 in Electrical Engineering by Quiz
1 answer 49 views

what is eddy current ?

asked Aug 6, 2017 in Electrical Engineering by Zeeshan
0 answers 11 views

Explain why potential difference is necessary to produce current in a circuit.

asked Jun 29 by Shimroz123
1 answer 41 views

How can a magnetic field be used to generate an electric current?

asked Mar 10, 2018 in Engineering electromagnetic by Quiz
1 answer 30 views

In a loss-free R-L-C circuit the transient current is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
0 answers 15 views

Explain the characteristics of inductor to be considered while designing it. What is the effect of over current and increase in temperature on inductor.

asked Mar 10, 2018 in Power Electronics by Quiz
0 answers 14 views

For heating a magnetic material using induction heating, the hysteresis and eddy current losses are respectively proportional to (a) f and f 2 (b) f 2 and f (c) f and f (d) none of the above 

asked May 25, 2018 in Utilization of electrical energy by Shimroz123
1 answer 5 views

List and state any four limitations of inter connected power station.

asked Sep 8, 2018 by Shimroz123
1 answer 6 views

State any two limitations of wind energy.

asked Sep 7, 2018 by Shimroz123
1 answer 10 views

What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.

asked Sep 6, 2018 by Shimroz123
1 answer 7 views

List four examples of insulating material and explain any two.

asked Sep 4, 2018 by Shimroz123
1 answer 24 views

A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and frequency are doubled, the new core losses are (A) 140 W (B) 180 W (C) 240 W (D) 480 W

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
0 answers 18 views

Hysteresis and eddy current loss are used in (1) Induction heating of steel (2) Dielectric heating (3) Induction heating of brass (4) Resistance heating 

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 10 views

The term hysteresis is associated with (A) On-Off control (B) P-I control (C) Feed forward control (D) Ratio control

asked Apr 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 61 views

State and explain Ohm's law for magnetic circuit.

asked Aug 10, 2018 in Basic concepts by Quiz
0 answers 30 views

Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.

asked Mar 10, 2018 in Power Electronics by Quiz
1 answer 30 views

With neat diagram explain calibration of energy meter by direct loading method.

asked Sep 6, 2018 by Shimroz123
1 answer 7 views

Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform

asked Sep 7, 2018 by Shimroz123
1 answer 152 views

The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

asked Apr 28, 2018 in Electrical Machine by Shimroz123

Welcome to electronics2electrical.com here you can ask questions related to electrical, electronics, mechanical, telecommunication, instrumentation, computer, mathematics, physics etc.
Be respectful to all the members. Do not copy and paste the answers from other websites which have copyright content. While asking question give full details about it.

Categories

Most popular tags

power motor dc circuit transformer voltage current used system phase resistance factor synchronous load ac energy induction electric generator series frequency between speed capacitor use electrical meter line difference control type mosfet transmission magnetic plant high single instrument bjt unit source advantages function diode and machine winding field define torque parallel amplifier supply shunt thyristor motors electricity arduino maximum time relay armature problem value on transformers types coil diagram state flow ratio material three formula starting direction theorem method emf operating efficiency digital wave microprocessor test instruments inductance loss measure operation connected signal low applications effect single-phase network temperature working constant losses different law wattmeter measuring compare controlled breaker drive device logic rc full switch flux wire resistivity disadvantages free of materials machines angle force converter conductor transistor gain open protection scr core measurement number bridge principle generators reactance circuits negative the friction iron loop short pole battery conservation steam resistors hysteresis computer using analog lines secondary station gate a rectifier inverter linear induced relays nuclear capacitance basic characteristics design direct work rotor electronics ammeter forces diesel damping rlc connection factors capacitors minimum insulation moving regulation running self systems air fault range main stability quality starter igbt eddy alternator ideal rl average 3-phase plants arc thermal error fuzzy biasing dielectric pressure balanced superposition errors copper rotation feedback impedance measured electronic electrons charge inductive transfer explain start off back curve over solar is three-phase tariff locomotive peak bias zener engineering commutator surge conductors rating universal potentiometer density permanent mechanical transducer capacity memory adc excitation two fuse pure harmonics application semiconductor inductor internal pmmc reaction welding resonance traction permeability breakers rms designed electromagnetic si generation brushes switching capacitive shaded rate 1 distribution resistor methods delta star oscillator reluctance simplification algebra 8085 boolean weston dynamometer insulating strength installation definition fuel heating earth units
...