Electrical Engineering ⇒ Topic : Parallel Magnetic Circuit-
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 Φ1 set up by the coil divides at B into two paths, namely ;
(1) flux Φ2 passes along the path BE
(2) flux Φ3 follows the path BCDE
Clearly,Φ1 = Φ2 + Φ3
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 S1 = reluctance of path EFAB
S2 = reluctance of path BE
S3 = 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 = Φ1S1 + Φ2S2
= Φ1S1 + Φ3S3
The reluctances S1, S2 and S3 must be determined from a calculation of l/aμ0μr for those paths of the magnetic circuit in which Φ1 + Φ2 + Φ3 exist respectively.
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