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Changing magnetic field causes to produce eddy currents that are confind within the core of transformer. these are like circulating whirls inside the core. these can be eliminated by making the core of thin layers. "Eddy current losses occur whenever the core material is electrically conductive. Most ferromagnetic materials contain iron: a metal that has fairly low resistivity (roughly 10-7 Ω m). The problem is intuitively obvious if you consider that the magnetic field is contained within a 'circuit' or loop formed by the periphery of the core in the same way as it is contained within a turn on the windings. Around that periphery a current will be induced in the same way as it is in an ordinary turn which is shorted at its ends"
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoEddy current loss can be minimized by slotting the opening in the box used to allow the penetration of the cable, so that a current path can not be completed. Another way to do this is to run both, or all three, in the case of three phase power, conductors through the same opening.
The issue with the current path in a penetration is that, if you just run a single cable through a hole in a box, that constitutes a one turn transformer, where the one turn is shorted, causing high current, i.e. the eddy current. If you slot the penetration to the edge of the box, you reduce the current to near zero. Alternatively, if you run balanced conductors through the same penetration, there is no net current.
The same thing happens in Transformers. Care is taken to ensure that the stacked lamination's are insulated from each other, and that each lamination does not constitute a complete circuit. Often, the lamination's are made in the form of an "E", and they are stacked in alternate directions so as to maximize magnetic flux, but they are insulated from each other so as to not complete a shorted circuit.
Wiki User
∙ 12y agoEddy currents are minimised by choosing a core material which has relatively high resistance, and then manufacturing the magnetic circuit core from laminations of that material -with each lamination insulated from its neighbours.
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What are the advantages of shell type transformers?
this type of transformer used special low loss steel to minimize eddy current losses and reduced leakage flux.
What is the equation for calculating eddy current losses?
F^2into Bm^2
Eddy current in transformer?
Yes, a transformer has eddy currents.
Why are stator cores laminated?
Thin metal laminations are used to minimize the magnetic flux eddy current loss in the stator cores of high-speed, high-performance induction motors.
Why eddy current damping is not used in moving iron instruments?
because eddy current is produced by the heat produced in winding
How do you minimize core losses?
Hysteresis and eddy current loss constitute core loss. It can be reduced by replacing solid core by laminated core... by adeeb
What are the advantages of shell type transformers?
this type of transformer used special low loss steel to minimize eddy current losses and reduced leakage flux.
Why laminations are used for iron parts of a dc machine?
Laminations minimize eddy currents, or current flow across the iron parts. This is one method to minimze stray losses.
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
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 equation for calculating eddy current losses?
F^2into Bm^2
Core loss of an induction motor?
Just like a transformer, the core losses are a combination of eddy current losses and hysteresis losses.
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.
What are the different kinds of losses in machines?
stray losses,armature copper losses,iron losses(Hysteresis and eddy current losses),mechanical losses(friction and windage losses)
During core bulding process why crgo lemination are used?
Transformer cores are chosen to limit eddy currents, which cause heating and losses in the core. Very thin laminations minimize this overhead cost of running a transformer by reducing losses associated with eddy currents.
What are the Advantages of amorphous core for a transformer?
The following advantages are there: 1. Low hysteresis losses 2. Low eddy current losses 3. Skin-effect in core is low
