Question

DISCUSSION Transformer core characteristics can be observed by applying an AC excitation and observing signals representing flux density and field intensity on an oscilloscope. This is often referred to as a BH loop (B is the flux density and H is the magnetic field intensity). A typical BH curve, as shown in Figure 7-1, illustrates a hysteresis effect. The BH trace over one complete cycle takes different paths and is non-linear B Flux Density Saturation Remanence Coercivity -H HeHc Field Intensity B. In Opposite Direction Figure 7-1 Typical B-H hysteresis loop for a ferromagnetic material The value of B when H is zero is given by the symbol Br and is called residual (remnant) flux density. This is the value of flux density that would remain in the material if the excitation were removed from the material. The value of H when B is zero is given the symbol Hc and is called coercive magnetic field intensity (historically named coercive force). This value of magnetic field intensity is the value required to "coerce" the flux density in the material back to the flux density value of zero

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Answer 1