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What is difference between eddy current loss and hysterisis loss?
Wiki User
∙ 11y ago
Whenever rotor cuts the magnetic field, emf is induced it. Due to this emf, some current may flow in the rotor. This current is called Eddy current which is unnecessary and considered a loss called Eddy current loss.
When a magnetic material is energised it follows B-H curve and when de-energised, it does not follow B-H curve. This difference is considered a loss called Hysterisis loss.
Wiki User
∙ 11y ago
Wiki User
∙ 11y ago'Hysteresis' comes from a Greek word, meaning 'to lag'. In this context, it describes the way in which changes in the flux density (B) in a transformer's core lags behind changes in the magnetic field strength (H) that causes it. The cross-sectional area of what is known as a 'hysteresis loop' (a graph plotted of B against H, over a complete cycle of a.c.) represents the amount of energy required to magnetise and demagnetise the core. These hysteresis losses represent energy losses within the core, and is a function of the type of material used in the manufacture of the core.
'Eddy current' losses are energy losses (I2Rt) caused by circulating currents set up within the core due to voltages induced into that core. These can be minimised by manufacturing the transformer's core from insulated laminations, rather than a solid core.
Wiki User
∙ 11y ago'Eddy currents' are circulating currents within the core of a machine, such as a transformer, due to voltages induced into that core due to a fluctuating magnetic field. These currents act to raise the temperature of the core, causes energy losses to the surroundings by heat transfer.
'Hysteresis' losses are due to the energy required to alternately magnetise and demagnetise the core as the magnetising current alternates. This energy represents a loss.
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What is exciting current in transformer?
Excitation current is the current necessary to "turn on" the transformer so it can be used. It's energy that is lost in the use of the transformer. Most of this loss I believe is associated with the hysterisis loop, although some will be lost as eddy currents.
How eddy current losses andhysterious losses can be reduced?
eddy current can be reduced by using laminated cores. and also be reducing the thickness of the stampings. transformer iron loss is the combination of eddy current loss and hysterisis loss. both the losses depend on core of the transformer and iron loss is a constant loss.
What is eddi current?
An 'eddy' (not 'eddi'!) current is a current that flows in the magnetic circuit (core) of an electrical machine, due to a voltage induced into that core by a changing magnetic field. Eddy currents cause energy losses in electrical machines. To minimise eddy currents and, therefore, their losses, machines use laminated cores which restrict the paths through which eddy currents can flow.
Does a laminated iron core increase eddy current losses?
No, the purpose of laminating the core is to reduceeddy-current losses.
How is eddy current related to the thickness of the stampings of core?
A: Eddy currents are current losses if an iron bolt is used to hold the core lamination together that alone will cause losses. Usually a brass bolt is used to eliminate losses
What is exciting current in transformer?
Excitation current is the current necessary to "turn on" the transformer so it can be used. It's energy that is lost in the use of the transformer. Most of this loss I believe is associated with the hysterisis loop, although some will be lost as eddy currents.
How eddy current losses andhysterious losses can be reduced?
eddy current can be reduced by using laminated cores. and also be reducing the thickness of the stampings. transformer iron loss is the combination of eddy current loss and hysterisis loss. both the losses depend on core of the transformer and iron loss is a constant loss.
What is the difference between ideal transformer and practical transformer?
There are basically 4 major differences :- 1. The windings (both primary and secondary) of an ideal transformer are considered to have zero resistance, hence the transformer is lossless. 2. There is no leakage flux in an ideal transformer. 3. The permiability of the core material in ideal transformer is considered to be tending to infinity and hence the current needed to set up the flux in the transformer is negligible. 4. There is zero hysterisis and eddy current losses in an ideal transformer.
When was Eddy Current Suppression Ring created?
Eddy Current Suppression Ring was created in 2003.
Eddy current in transformer?
Yes, a transformer has eddy currents.
What is a metallic substance used in eddy current?
Alimunium is the best Element, that can be used for the production of eddy current.
What is a current of air?
An eddy.
Why the name eddy for eddy current?
That's from an analogy from eddy currents in water. Quoting from the Wikipedia, article "Eddy (fluid dynamics": "In fluid dynamics, an eddy is the swirling of a fluid and the reverse current created when the fluid flows past an obstacle."
Why eddy current damping is not used in moving iron instruments?
because eddy current is produced by the heat produced in winding
What is a four letter word for circular current that starts with e?
eddy
What is a current of air called?
An eddy.
Why armature core is laminated in dc machine?
to reduce the eddy current loss in the machine
