1/11/2024 0 Comments Magnetic flux solenoid formula![]() ![]() Inductance is a single number => it has no data of the magnetic vector field. Inductance is the total magnetic flux of a coil divided by the current. The following link points to one for tight short solenoids, so tight that the winding is more a multi turn wire loop with no axial length: There are some well known usable formulas for the inductances of some simple coils. Finite element analysis (FEA) is the general name of the practical numeric calculation methods. Only in some special cases the effect of the Iron can be expressed with formulas.Ĭalculate numerically = to solve the field differential equations in given geometry by dividing the space, wires and possible iron to small enough pieces and approximating the derivatives. How much? It's solvable only numerically. If there exists iron somewhere, it affects to the field. The magnetic field strength or flux density of a winding isn't one number, it's a complex spatial vector field, every point in the space has it's own vector direction and strength which aren't writable with any ready to use formulas, it's only possible to calculate them numerically. Note: for the sake of simplicity assume air core in the solenoid.Įdit: if my second question seems to spill into a larger area of expertise please disregard it and simply suggest the answer to the main question as it is important for finding if the range of the field stays below the saturation point. How to adjust that formula to include the width/diameter of the coil?Īlso, a bit aside from the main question, please give me a hint How to calculate the attracting force developed in such a wide solenoid in Newtons, knowing field intensity and, say, attracting an iron cylinder of known mass and permeability?.How to reflect this fact in the calculation of the field?.Imagine the flux lines getting thinner as the coil loops get wider. Wider coil surely weakens the intensity of the field inside the coil. Those are often more wider coil diameter and of short coil length. I am considering a single electromagnet as a model for a BLDC motor' stator coil. Apparently it is based on assumption that diameter is smaller than the length and hence does not significantly impact this calculation. This formula does not take into consideration the width (or diameter) of the coil. L is length between the coil poles (along the axis of the field flux) H magnetic field intensity in ampere-turns ![]() Textbook formula for field intensity in solenoid coil is H = (N * I) / l ![]()
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