![]() ![]() The useful flux when set up in the air gap, it tends to bulge outward at (b and b’) as shown in the above figure, because of this bulging, the effective area of the air gap increases, and the flux density of the air gap decreases. When magnetic flux lines pass through the air gap the lines of force repel each other & as a result, the flux density in the air-gap decreases. This variation in the magnetic reluctance causes the magnetic flux to bulge in the air gap area. The reluctance of the magnetic circuit changes when the flux travels from the magnetic circuit to air and again air to the magnetic circuit. The higher leakage coefficient shows that there is more leakage flux in the magnetic circuit. The leakage coefficient 1.01 shows that there is a 1% leakage flux. If the leakage flux coefficient is equal to unity, it shows that there is no leakage flux in the magnetic circuit. Example:įrom the above example, the leakage coefficient is ![]() Thus, the total flux( φ) in the magnetic circuit is the sum of the leakage flux( φ l) and the air-gap flux (φ g). The leakage flux that does not do any useful work in the magnetic circuit is the leakage flux( φ l). The more the flux in the air gap, the more useful flux. The flux in the air-gap is the useful flux(φ g). We can easily understand what is leakage flux & fringing by taking the example of the solenoid coil. In this post, we will discuss in detail what is leakage flux & fringing. It is practically not possible that whole the flux flows in the magnetic circuit without any leakage. All the magnetic flux produced does not flow in the magnetic circuit, and some part of the flux leaks from a magnetic core. Leakage flux is the flux that leaks from the magnetic circuit. ![]()
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