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  • Users: Hol
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  1. Hol

    back EMF?

    I have built an electromagnet that is capable of attracting ferromagnets, from a small distance. When this electromagnet attract's small pieces of iron or steel, I assume the magnetic field of the electromagnet "changes" it increases due to the piece of iron. But what is the iron's B = to?
  2. Hol

    Powerful magnetic force from an electromagnet,

    Is it possible to produce over 1000 lb of magnetic force over a distance of 4 inches, using an electromagnet? How difficult would it be? Explaining the general spec's of such an electromagnet? And most importantly, the most expensive part of all the power input... How much power would this...
  3. Hol

    How can I expand the magnetic field to apply over larger distances?

    An electromagnet can pull with 100N on ferromagnets 0.5cm away, when r is near zero the force increases significantly, what are the possible methods of keeping that same rate of force (100N) applied over large distances over 0.5cm? Increasing the size of the electromagnet? Or applying more voltage?
  4. Hol

    Manipulating this kind of electromagnet?

    This is an electromagnet that has both poles on it's surface. Example . When it's surface is in direct contact to a ferromagnet it generates forces up to 480 lb. Now it's manufacture states that it's not possible to create a repulsive force... I would disagree and would ask you if this is true...
  5. Hol

    Feeding more current to a motor using a Step down transformer?

    A motor under no load uses 10 Amps, however at max load draws 120 Amps at 12 Volts. Usually, I would apply more voltage to the motor(without load) to increase the current. If the total input power is 1440W, and the power source is 1500W, why can't I use a step down transformer to force the...
  6. Hol

    Powerful electromagnet

    Im trying to build a powerful electromagnet with a field strength of a 1 Tesla or neat it. While planning... one concern to me is the input power required. What could be the range from? I'll be using a high permeability core that saturates beyond 1 Tesla. Is it possible? An electromagnet that...

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