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The role of the transformer core
The actual work of the transformer is always in the exchange state, the power loss not only in the resistance of the coil, and alternating current is generated in the iron core under the magnetic. Usually the core of the power loss is called "iron loss", the iron loss caused by two reasons, one is "hysteresis loss", is a "eddy current loss."
Hysteresis loss is the core magnetization process, due to the presence of hysteresis produced iron loss, this loss is proportional to the size of the hysteresis loop size and material surrounded. Silicon narrow hysteresis loop, use it to do the transformer core hysteresis loss is small, it can greatly reduce the extent to generate heat.
Since silicon has the above advantages, why do not monolithic silicon steel core, but also it is processed into a sheet it?
This is because the sheet-iron iron loss can be reduced another - "eddy current losses." When the transformer coil in an alternating current, the magnetic flux it produces, of course, alternating. This change of the magnetic flux induced current in the core. Induced current generated in the core, in a plane perpendicular to the direction of circulation of the magnetic flux, so called vortex. Eddy current loss also makes the core heat. In order to reduce eddy current losses, the transformer core quartet built silicon steel insulated with each other, so that eddy currents in the narrow shape of the loop, through a smaller cross-section to increase the resistance of the eddy current path; at the same time, the silicon to make silicon the resistivity of the material increases, also play a role in reducing the vortex.
Used transformer core, generally used 0.35mm thick cold-rolled silicon steel sheet, according to the desired size of the core, it would cut the growth of shaped pieces, then overlap into a "day" shaped or "mouth" shape. Speaking from the truth, if it is to reduce the eddy current, the thickness of the silicon thin film strip splicing the more narrow, the better. This not only reduces the eddy current losses, reduce the temperature, but also save silicon materials used. But in fact when making silicon steel core. Not a single favorable factors from the side view, because that make the core, to greatly increase the hours of work, but also reduces the effective cross section of the iron core. Therefore, when using silicon steel transformer core production, from the specific conditions, on balance, to choose the best size.
According to the principle of electromagnetic induction transformer is made in the leg above the wound closed with two windings, a primary winding and a secondary winding. When the primary winding coupled with the AC voltage. Original spare set of streams have to pay alternating current, and the establishment of magnetic potential, they produce under the action of magnetic potential core in alternating main flux, the main magnetic flux in the core while passing through, {cross-linking] I. secondary winding is closed due to electromagnetic induction effects were induced electromotive force in a secondary winding, as to why it can boost and buck it? Lenz would need to explain, the magnetic flux generated by the induced current, the total flux of the original impede change, opposite induced current generated when the primary flux increases with the original flux and flux, that is secondary main flux induction flux generated with the primary winding winding arising contrary, so the secondary winding appeared low-grade alternating voltage so that the core is a magnetic circuit portion of the transformer, the transformer winding is a circuit part.
Hysteresis loss is the core magnetization process, due to the presence of hysteresis produced iron loss, this loss is proportional to the size of the hysteresis loop size and material surrounded. Silicon narrow hysteresis loop, use it to do the transformer core hysteresis loss is small, it can greatly reduce the extent to generate heat.
Since silicon has the above advantages, why do not monolithic silicon steel core, but also it is processed into a sheet it?
This is because the sheet-iron iron loss can be reduced another - "eddy current losses." When the transformer coil in an alternating current, the magnetic flux it produces, of course, alternating. This change of the magnetic flux induced current in the core. Induced current generated in the core, in a plane perpendicular to the direction of circulation of the magnetic flux, so called vortex. Eddy current loss also makes the core heat. In order to reduce eddy current losses, the transformer core quartet built silicon steel insulated with each other, so that eddy currents in the narrow shape of the loop, through a smaller cross-section to increase the resistance of the eddy current path; at the same time, the silicon to make silicon the resistivity of the material increases, also play a role in reducing the vortex.
Used transformer core, generally used 0.35mm thick cold-rolled silicon steel sheet, according to the desired size of the core, it would cut the growth of shaped pieces, then overlap into a "day" shaped or "mouth" shape. Speaking from the truth, if it is to reduce the eddy current, the thickness of the silicon thin film strip splicing the more narrow, the better. This not only reduces the eddy current losses, reduce the temperature, but also save silicon materials used. But in fact when making silicon steel core. Not a single favorable factors from the side view, because that make the core, to greatly increase the hours of work, but also reduces the effective cross section of the iron core. Therefore, when using silicon steel transformer core production, from the specific conditions, on balance, to choose the best size.
According to the principle of electromagnetic induction transformer is made in the leg above the wound closed with two windings, a primary winding and a secondary winding. When the primary winding coupled with the AC voltage. Original spare set of streams have to pay alternating current, and the establishment of magnetic potential, they produce under the action of magnetic potential core in alternating main flux, the main magnetic flux in the core while passing through, {cross-linking] I. secondary winding is closed due to electromagnetic induction effects were induced electromotive force in a secondary winding, as to why it can boost and buck it? Lenz would need to explain, the magnetic flux generated by the induced current, the total flux of the original impede change, opposite induced current generated when the primary flux increases with the original flux and flux, that is secondary main flux induction flux generated with the primary winding winding arising contrary, so the secondary winding appeared low-grade alternating voltage so that the core is a magnetic circuit portion of the transformer, the transformer winding is a circuit part.