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Recent content by Hol

  1. Hol

    Powerful magnetic force from an electromagnet,

    There is more explanation from this link that makes me consider this to be reliable but not sure... Source.
  2. Hol

    Powerful magnetic force from an electromagnet,

    Could this calculator be reliable?
  3. Hol

    Powerful magnetic force from an electromagnet,

    @EdStainless, why is it not practical? Please do explain.
  4. Hol

    back EMF?

    @waross , How so? Why can't -V(emf) be induced to resist the change of an additional field generated by the alignment of the ferromagnet's domains? And if there is a decrease in field strength that "change" induces -V to resist the change, wouldn't it? I assumed that -V can be induced only...
  5. 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?
  6. Hol

    Powerful magnetic force from an electromagnet,

    @EdStainless, could you explain why it would be in detail? @IRstuff most of those electromagnet's forces are rated at 3000 lb + at direct contact, and 90% of that force is dropped with a gap that is 0.1"... Yet they don't consume a lot of power, I assume by increase P from 200W to 2000W the...
  7. 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...
  8. Hol

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

    As I increase the turns of the electromagnets, eventually more voltage is needed to maintain the same magnetic field. Thank you @IRstuff, eventually the field will become larger. But would the force change and become greater?
  9. 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?
  10. Hol

    Manipulating this kind of electromagnet?

    What is common is an attractive electromagnet that is able to produce forces above 5,000 lb easily. However, it more difficult to generate similar magnitude of force with a repulsive force. Is it practical to build a similar spec, similar input or close to it, and generate massive repulsive...
  11. Hol

    Manipulating this kind of electromagnet?

    Usually I'd find electromagnet's with the capacity of attracting(i.e holding) Fe in massive rates of force. Is it it possible to build an electromagnet that could repel( similar electromagnets) with large forces using the same materials however in a different designs?
  12. Hol

    Manipulating this kind of electromagnet?

    @IRstuff Is there a specific name to this configuration? That I can research more about? I'm imagining two poles on one side, I understand that point. However, why can't the repulsive force be achieved here using an identical product? Here is why I'm confused...there is a magnetic field, and...
  13. 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...
  14. Hol

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

    Sorry for my terrible misunderstanding, I'm not an expert in this field at all. Hence why I come here for help. This is a lift motor(i.e winch) that can carry objects over 1000 lb(load). This particular DC motor, has the potential to generate 4448 of force on objects that weight 1000 lb. Can...
  15. 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...
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