B = H = = = μ0 μr μr A number of co-ordinates are selected from the B-H curve and is calculated for each as shown in the μr following table. B (T) 0.10 0.35 0.55 0.72 1.03 1.24 1.37 H (A/m) 250 500 750 1000 1500 2000 2500 318 577 583 573 541 493 436 is plotted against H as shown below. μr (a) From the the value of when the magnetic field strength is 1200 A/m is around 560 - 565 μr (b) The value of the magnetic field strength when is 500 is around 400 A/m or 1900 A/m μr EXERCISE 60, Page 149 1. Part of a magnetic circuit is made from of length 120 mm, cross-sectional area 15 and relative permeability 800. Calculate (a) the reluctance and (b) the absolute permeability of the steel.
B = μ0 μr H μr = = = A number of co-ordinates are selected from the B-H curve and μr is calculated for each as shown in the following table. B (T) 0.10 0.35 0.55 0.72 1.03 1.24 1.37 H (A/m) 250 500 750 1000 1500 2000 2500 318 577 583 573 541 493 436 μr is plotted against H as shown below. (a) From the the value of μr when the magnetic field strength is 1200 A/m is around 560 - 565 (b) The value of the magnetic field strength when μr is 500 is around 400 A/m or 1900 A/m EXERCISE 60, Page 149 1. Part of a magnetic circuit is made from of length 120 mm, cross-sectional area 15 and relative permeability 800. Calculate (a) the reluctance and (b) the absolute permeability of the steel.
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