2. The magnetic circuit of Fig 1.26 consists of rings of magnetic material in a stack of height h. The rings have inner radius R, and outer radius Ro. Assume that the iron is of infinite permeability ( u → 0 ) and neglecting the effects of magnetic leakage and fringing calculate; a) The mean core length lc and cross sectional area Ac b) The reluctance of the core Re and that of the air gap Rg c) For N =65 calculate the inductance L, and d) The current required to operate at an air gap flux density of B, = 1.35 T Ro R, = 3,4 cm R, = 4.0 cm h =2 cm 8 = 0.2 cm N turns
Ampere Circuital Law
Ampere's Law states that "for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop.”
Current Density
To design the electrical and electronic system, the current density is an important factor. The designer current level is the factor on which the circuit performance depends and with the help of the dimensions of the conducting current the current density is then determined. For instance, despite the lower current demanded by smaller devices as integrated circuits are reduced in size, there is a type of trend in achieving the higher device number in even smaller chip areas. The current density is increased in this region at higher frequencies because the conducting region in a wire becomes confined and this is known as the skin effect. The consequences increase as the current densities become higher.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
