Electrical Engineering ⇒ Topic : Parallel Magnetic Circuit

Peter
 
Parallel Magnetic Circuit: A magnetic circuit which has more than one path for flux is called a parallel magnetic circuit. It can just be compared to a parallel electric circuit which has more than one path for electric current. The concept of parallel magnetic circuit is illustrated in Fig. (a). Here a coil of N turns wounded on limb AF carries a current of I amperes. The flux Φ_{1} set up by the coil divides at B into two paths, namely ;
figure (a) (1) flux Φ_{2} passes along the path BE (2) flux Φ_{3} follows the path BCDE Clearly,Φ_{1} = Φ_{2} + Φ_{3} The magnetic paths BE and BCDE are in parallel and form a parallel magnetic circuit. The AT required for this parallel circuit is equal to AT required for any *one of the paths. Let S_{1} = reluctance of path EFAB S_{2} = reluctance of path BE S_{3} = reluctance of path BCDE Total m.m.f. required = m.m.f. for path EFAB + m.m.f. for path BE or path BCDE or NI = Φ_{1}S_{1} + Φ_{2}S_{2} = Φ_{1}S_{1} + Φ_{3}S_{3} The reluctances S_{1}, S_{2} and S_{3} must be determined from a calculation of l/aμ_{0}μ_{r} for those paths of the magnetic circuit in which Φ_{1} + Φ_{2} + Φ_{3} exist respectively.  
 
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