VI.Reluctance R=Ni=s (length) Dd (permeability)(cross-sectionalarea) [Reluctance,analogous to resistance] 中 N turns H41 1= 41a1D =M Contour for ←52→2■ 2 Series evaluating Ampere's law H2d2D 交=NM=中绿1+见2】 Depth D a 中=雪网+92) 2=2D N turns 乎=Ni 41a1D Paths for evaluation of Ampere's circuital Parallel Depth D law which give us that Hy=H2 Ni/s (b) Figure 6-11 Magnetic circuits are most easily analyzed from a circuit approach where (a)reluctances in series add and()permeances in parallel add. A.Reluctances In Series 41aD' R2=5 42a2D Ni Φ=双+风 ∮H.d=Hs,+H252=Ni 6.641,Electromagnetic Fields,Forces,and Motion Lecture 8 Prof.Markus Zahn Page 10 of 136.641, Electromagnetic Fields, Forces, and Motion Lecture 8 Prof. Markus Zahn Page 10 of 13 VI. Reluctance [Reluctance, analogous to resistance] R ( ) Φ µ ( ) ( ) − 0 Ni s length == = Dd permeability cross sec tional area A. Reluctances In Series R1 µ 1 1 1 s = , a D R2 µ 2 2 2 s = a D Φ + 1 2 Ni = R R + ∫ i v 11 22 C H dl = H s H s = Ni Series Parallel