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Limit effects (heat loss) caused by eddy currents
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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.
What does the voltage across a inductor do?
voltage across inductor create a flux. because of variation current developes an opposite emf.
Why pole shoes are laminated in a dc machine?
they are used to protect windings to get down and spread the flux uniformly.
What is flux used for when soldering?
Flux is used to keep metals from oxidizing. Solder will not bond well with copper-oxides which are formed when copper is exposed to high temperatures (ie a soldering iron) the flux prevents the oxidation. If you were to solder without flux the solder joint would be weak and possibly completely nonconductive.
Why do you have variation in leakage reactance of induction motor?
leakage reactance in induction motor depends on the reluctance of the path in which the leakage flux is establishing. with the increase in stator current the leakage flux also increases but it cannot maintain linear relationship because of saturation of the leakage flux path, even though current is increasing the flux will not increase and it'll be constant after saturation. this leakage flux links with the stator winding and induces emf which will be opposite to the supply voltage causes drop in applied voltage , the drop in the applied voltage is represented with the leakage reactance. as flux is responsible for the induction of emf , the increase in current does not increase flux after saturation and therefore emf also doesnot increase so the leakage reactance is not constant throughout the machine operation...
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.
What is the need of lamination in transformer?
The laminated plates prevent eddy currents from forming and thus creating unwanted magnetic flux which would counter the flux needed to induce the electric current in the secondary coil
Why does a 3 phase transformer produce an alternating flux while a 3 phase induction machine produces rotating flux when fed through 3 phase supply?
In a 3-ph transformer the flux also rotates round the 3 cores but you don't see anything moving.
Is the unit of magnetic flux equal to Vs?
The SI unit for magnet flux is (Wb) weber. However, if the magnet flux variation in 1 second, produces 1 V of electromotive force in a coil, this flux will correspond to 1 Wb. Therefore, 1Wb = 1 Vs (voltage-second).
What does the voltage across a inductor do?
voltage across inductor create a flux. because of variation current developes an opposite emf.
Why pole shoes are laminated in a dc machine?
they are used to protect windings to get down and spread the flux uniformly.
What is flux used for when soldering?
Flux is used to keep metals from oxidizing. Solder will not bond well with copper-oxides which are formed when copper is exposed to high temperatures (ie a soldering iron) the flux prevents the oxidation. If you were to solder without flux the solder joint would be weak and possibly completely nonconductive.
Hetropolar field winding in dc machines?
a common magnetic flux crosses the air gab from stator to rotor cores causing in the production of north and south poles in the air gab between them
How the losses will reduce if you keep the flux density in high level in power transformer?
The flux density is set at the most the core material can stand, which for standard laminated transformer iron is around 1 Weber per square metre. Based on that and the cross-section area of the core, the volts per turn figure is calculated for both the primary and the secondary winding. If the operating voltage stays constant, so will the flux density and the iron losses.
What are the two american welding society abbreviations for the arc welding processes that melt a tubular electrode with alloys deoxidizers and slag formers in their cores?
One would be FCAW. Flux Cored Arc Welding.
Is the mutual inductance of a transformer is constant under all operating conditions?
The mutual inductance is defined as the voltage induced in one winding when the current in the other winding changes by one amp per second. In an AC system it is the open-circuit induced voltage in the secondary divided by 2 x pi x frequency times the current in the primary. The mutual inductance is determined by the size and shape of the transformer. However if the transformer is operated at more than the rated flux-density of the magnetic core material, the mutual inductance falls (for normal laminated iron cores the maximum flux density is 1 Weber per square metre).
Difference between flux linkage and flux leakage?
i) leakage flux is those flux which goes through the air and linkage flux is those flux whose go through the cell. ii)leakage flux is the loss at flux but linkage flu is warning flux. iii)leakage flux is cause of eddy current loss and linkage flux is case of copper loss.
