Electromagnets details
I have been reading a very old book about electricity (from 1860´s: Treaty of experimental and applied Physics , by Ganot ) . I have found some really interesting ideas about the Ruhmkorff coil, which seems to be the base for the Clemente Figuera 1902 device:
"...but only after Ruhmkorff insulated completely the induction current with lac rubber he could use all the voltage of those currents, and recognized that those have both the properties of static electricity and dynamic"
In the 1902 patent Figuera just used 88 turns in the electromagnets and he showed us in the drawing that the insulation was really thick.
"Recently M. Ruhmkorff has applied his coil to recharge very energetic batteries....which are charged in some seconds..." (!!!!)
"The effects of a coil are much more energetic if inside the coil is introduced a bar of soft iron"
This is the same as stated in the book "Awesome Force" by Cater in Figure 21. The soft iron core enhance the strengt of the magnetization (exponentially) over a simple coreless coil. This is because the magnetization curve of some metals increase very rapidly (exponentially). Figuera just used 88 turns , I think to avoid reaching saturation of the soft iron core. If you work in the exponential zone of the curve with very little current you can get a strong electromagnet. Saturation happens around N·I/L = 780 Amp·Turns/meter ( in US units: 20 Amp·Turns/inch ) (N is turns, I is intensity , and L is length). Then a moderate number of turns must be used to design the electromagnets. If the electromagnets get saturated I think they won´t get unmagnetized as quickly during the switching off periods. I am designing a new electromagnets with few turns, thick insulation, iron core and also with higher diameters to have a great surface for the magnetic field.
Magnetization curves of 9 ferromagnetic materials, showing saturation. 1.Sheet steel, 2.Silicon steel, 3.Cast steel, 4.Tungsten steel, 5.Magnet steel, 6.Cast iron, 7.Nickel, 8.Cobalt, 9.Magnetite
Simplified comparison of permeabilities for: ferromagnets (μf), paramagnets(μp), free space(μ0) and diamagnets (μd)
Saturation (magnetic) - Wikipedia, the free encyclopedia
Magnetic Permeability
I have been reading a very old book about electricity (from 1860´s: Treaty of experimental and applied Physics , by Ganot ) . I have found some really interesting ideas about the Ruhmkorff coil, which seems to be the base for the Clemente Figuera 1902 device:
"...but only after Ruhmkorff insulated completely the induction current with lac rubber he could use all the voltage of those currents, and recognized that those have both the properties of static electricity and dynamic"
In the 1902 patent Figuera just used 88 turns in the electromagnets and he showed us in the drawing that the insulation was really thick.
"Recently M. Ruhmkorff has applied his coil to recharge very energetic batteries....which are charged in some seconds..." (!!!!)
"The effects of a coil are much more energetic if inside the coil is introduced a bar of soft iron"
This is the same as stated in the book "Awesome Force" by Cater in Figure 21. The soft iron core enhance the strengt of the magnetization (exponentially) over a simple coreless coil. This is because the magnetization curve of some metals increase very rapidly (exponentially). Figuera just used 88 turns , I think to avoid reaching saturation of the soft iron core. If you work in the exponential zone of the curve with very little current you can get a strong electromagnet. Saturation happens around N·I/L = 780 Amp·Turns/meter ( in US units: 20 Amp·Turns/inch ) (N is turns, I is intensity , and L is length). Then a moderate number of turns must be used to design the electromagnets. If the electromagnets get saturated I think they won´t get unmagnetized as quickly during the switching off periods. I am designing a new electromagnets with few turns, thick insulation, iron core and also with higher diameters to have a great surface for the magnetic field.
Magnetization curves of 9 ferromagnetic materials, showing saturation. 1.Sheet steel, 2.Silicon steel, 3.Cast steel, 4.Tungsten steel, 5.Magnet steel, 6.Cast iron, 7.Nickel, 8.Cobalt, 9.Magnetite
Simplified comparison of permeabilities for: ferromagnets (μf), paramagnets(μp), free space(μ0) and diamagnets (μd)
Saturation (magnetic) - Wikipedia, the free encyclopedia
Magnetic Permeability
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