Electrical Engineering ⇒ Topic : Calculation of Hysteresis Loss

Mason
 
Calculation of Hysteresis Loss We will now show that area of hysteresis loop represents the energy loss/m^{3}/cycle. Let l = length of the iron bar A = area of Xsection of bar N = No. of turns of wire of solenoid Suppose at any instant the current in the solenoid is i. Then, Suppose the current increases by di in a small time dt. This will cause the flux density to increase by dB [See Fig.(a)] and hence an increase in flux d (= AdB). This causes an e.m.f. e to be induced in the solenoid.
figure (a) By Lenz's law, this e.m.f. opposes the current i so that energy dW is spent in overcoming this opposing e.m.f.  
 
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