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  1. ndsram

    Which is better material for One way clutch system casing SAE 8615 (8620) or 20CrMo

    I have 2 materials for one way clutch system, SAE 8615 (modified C% 0.1-0.14 or 8620 - Nickel Chromium Molybdenum Steel) and 20CrMo. This clutch is being used in starter motor. I could see failure of 20CrMo (Chromium Molybdenum Steel) like the casing getting crack in one particular variant...
  2. ndsram

    Measuring relatively high static and pulsed magnetic fields

    HI ROB Try using AD22151 or MLX90217 for linear output. These Hall sensor can measure a field upto 2T. kindly refer the datasheet
  3. ndsram

    What type of magnetic metal to use?

    Just for the moment, we'll keep the time entity away. So by 1., we will later consider this. By 2. its true that the magnetic metal will get attracted to the magnet and the pull force will decay as distance increases between magnet and the metal. Please clarify, if you've a flux return path or...
  4. ndsram

    What type of magnetic metal to use?

    Based on your dimension, I simulated and found the force to be -0.0643lbhttp://files.engineering.com/getfile.aspx?folder=5a73d2ac-9b3b-4c8f-a4e4-b3c139ab9e8e&file=Pull_force.pptx
  5. ndsram

    What type of magnetic metal to use?

    Try using Low carbon Steel like 1010 or 1008 or 1006. Use this as in soft case do not harden it. AS soft as it is, it will be soft magnetic and will not get magnetized over period of time
  6. ndsram

    Polymer suitable for maching thin walls

    HI try some Glass Filled Nylon material where it has good strength and machinability or Glass Filled Phenolic Material has good strength but machinability is little bit doubtful. Check if you can purchase some PEEK or PAEK if they are availablereadily Regards N D Senthil Ram
  7. ndsram

    Attraction/repulsion force between two equal magnets?

    Refer to this book Permanent Magnet And Electromechanical Devices by Edward P. Furlani , chapter 4 pg 268 and above, you'll find good explanation for force and calculation can you pl convert to mm and add the data
  8. ndsram

    Equal surface fields? Different pull forces?

    BY converging or diverging the flow of flux lines in a steel, the holding force may be determined. Try to see some example of holding magnet
  9. ndsram

    Attraction/repulsion force between two equal magnets?

    Can you please tell me your application So I could give you some input on the same Be assured that it ll take 20N of course no doubt, but have safety factor for consideration
  10. ndsram

    Attraction/repulsion force between two equal magnets?

    Yes the attraction force is the change in attribute which will directly influence the force. One of the main attribute is the distance between the two magnets. Reg N D Senthil Ram
  11. ndsram

    Equal surface fields? Different pull forces?

    Dear Vis99, It is not so, the way in which you perceive is more important. Consider what are the criteria will affect for of a magnet. Take a simple example and get into basic understanding.Lets take steel and magnet of area 10 mm^2 of both and volume be 1000 mm^3 Here are few Distance between...
  12. ndsram

    Equal surface fields? Different pull forces?

    One more thing, i would also like to mention in addtion to the reply in your other post. The magnetic force of attaction & repulsion will vary w.r.t the surface area of the magnet. If you have 2 different sized magnet with different volume or if same sized magnet with different magnetic...
  13. ndsram

    Attraction/repulsion force between two equal magnets?

    Dear Vis99, I'll cite an example to understand the force of the magnet. First, Let's have magnet with 1 mm away from a steel plate, the force of the magnet to the steel plate, say 10N. The steel plate have no remenant magnetism, so the magnet or the steel will move towards the other if you fix...
  14. ndsram

    How to test for good passivation/phosphating?

    Yes I agree that the A967 is for testing passivation on Stainless Steel, However, with No standard for testing passivation on NdFeB magnet is available, I thought I can use this standard, provided that a few test like, Salt Spray Test, Salth Water Immersion test & Humidity Test may be carried...
  15. ndsram

    Best common metal for "passing" permanent magnet's magnetic field

    Sorry for the wrond orientation of the table MDL Grade ALCOMAX III DIN 43/5 Br mT 1260 Gauss 12600 bHc KA/m 52 Oersted 650 jHc KA/m 53 Oersted 663 BHMax kJ/m3 43 MGO 5,4
  16. ndsram

    Best common metal for "passing" permanent magnet's magnetic field

    Kyldera, Please find the magnetic properties of E818 (Alcomax III) MDL Grade DIN Br bHc jHc BHMax mT Gauss KA/m Oersted KA/m Oersted kJ/m3 MGO ALCOMAX III 43/5 1260 12600 52 650 53 663 43 5,4 Yes if the magnetic field of electromagnet and the permanent magnet are identical, the flow of flux...
  17. ndsram

    How to test for good passivation/phosphating?

    THank you IRStuff I finally has to comply with A967 standard for passivation testing on metal surface
  18. ndsram

    Best common metal for "passing" permanent magnet's magnetic field

    Dear Kyldera, I have a suggestion here, if you can put a coil near to the crack and increase the current step by step going through the coil which will increase the flux flowing through the metal proportionately. For every step measure the change in the flux leakage. At one point you can...
  19. ndsram

    magnetize ferrite with rare earth PM - energy?

    You need not to worry about the longevity of the NdFeB Magnet (magnetic field). Because you need 3x times the Coercivity of the NdFeB magnet to demagnetize. Here the energy of the N52 magnet will also remain undisturbed. On the Ferrite magnet, the impact of the magnetic field of NdFeB magnet...
  20. ndsram

    Best common metal for "passing" permanent magnet's magnetic field

    Yes I regret for the typo error it is SS430. Thank you MagBen

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