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Many online calculators we've seen determine pull force based on a theoretical calculation of the flux density. With a few assumptions, flux density (in Gauss) can be related to the expected pull force. Unfortunately, this simplification often fails to match experimentally measured data.
This page calculates expected pull forces based on extensive product testing. The Surface Field data is only valid for points along the center axis of the magnet, and assumes a single magnet in free space.
All dimensions and distances must be in decimal format. Fractional inches will not calculate correctly.
This calculator only considers discs, cylinders and rings that are magnetized along the clyindrical axis. While K&J Magnetics offers diametrically magnetized discs, this calculator does not apply to them.
This calculator is currently a beta version and is intended only for reference. K&J Magnetics, Inc. will not be held liable for its use. All calculations are approximations and should not be used as the sole source of design data. The factors of your application may change these values considerably. Be sure to test magnets in your configuration.
Analyze your electromagnet to determine its dimensions and the amount of current you will be running through it. For example, imagine you have a magnet with 1,000 turns and a cross-sectional area of 0.5 neters that you will operate with 10 amperes of current, 1.5 meters from a piece of metal.
Many online calculators we've seen determine pull force based on a theoretical calculation of the flux density. With a few assumptions, flux density (in Gauss) can be related to the expected pull force. Unfortunately, this simplification often fails to match experimentally measured data.
This page calculates expected pull forces based on extensive product testing. The Surface Field data is only valid for points along the center axis of the magnet, and assumes a single magnet in free space.
All dimensions and distances must be in decimal format. Fractional inches will not calculate correctly.
This calculator only considers discs, cylinders and rings that are magnetized along the clyindrical axis. While K&J Magnetics offers diametrically magnetized discs, this calculator does not apply to them.
This calculator is currently a beta version and is intended only for reference. K&J Magnetics, Inc. will not be held liable for its use. All calculations are approximations and should not be used as the sole source of design data. The factors of your application may change these values considerably. Be sure to test magnets in your configuration.
Please report any troubles, concerns or suggestions about this calculator to: [email protected].
•••FactoryTh/iStock/GettyImages
By Timothy Banas
Engineers make solenoids – electromagnets – by twisting lengths of metal in a spiral fashion around a cylindrical template. You can determine the magnitude of that force by plugging the dimensions and other properties of the magnet based into a simple equation: F = (n X i)2 X magnetic constant X a / (2 X g2). Passing an electrical current through the solenoid results in a magnetic field that exerts force on nearby ferromagnetic objects, such as pieces of iron or steel. The joining together of magnetic and electric forces on a charged item is called the Lorentz force.
Calculate the force by writing the equation:
Where, F = force, i = current, g = length of the gap between the solenoid and a piece of metal, a = Area, n = number of turns in the solenoid, and the magnetic constant = 4 x PI x 10-7.
Analyze your electromagnet to determine its dimensions and the amount of current you will be running through it. For example, imagine you have a magnet with 1,000 turns and a cross-sectional area of 0.5 neters that you will operate with 10 amperes of current, 1.5 meters from a piece of metal. Therefore:
Plug the numbers into the equation to compute the force that will act on the piece of metal.
Force = ((1,000 x 10)2 x 4 x pi x 10-7 x 0.5) / (2 x 1.52) = 14 Newtons (N).