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Recent content by jared1313

  1. jared1313

    Stranded motor windings. What is the purpose?

    I have several BLDC motors used for the so called "Hoverboard" devices that children seem to love these days. I have taken a few of these apart and noticed that some of them use stranded magnet wire on the rotor teeth. For example, my particular motor uses a five strand 24 gauge wire arrangement...
  2. jared1313

    Determination of iron alloy used in motor or generator laminations

    Awesome! Thank you for that suggestion and for sharing the file as well as your knowledge. That is a great jump start! I would never have had any idea what they commonly use in their motors.
  3. jared1313

    Calculating torque applied to a drum by a rope or cable of some diameter

    No, this is not a homework problem but rather a personal project to accurately measure torque on a drum. Additionally, this is only considering a single layer of windings. So it seems that the effect of the torque arm not being equal to the diameter of the drum is usually negligible if the...
  4. jared1313

    Calculating torque applied to a drum by a rope or cable of some diameter

    Hi there, Lets say I have a drum of radius (R). Attached to the drum is a spool of rope or cable of diameter (D) with a weight attached to the end. I wish to calculate the torque applied to the drum. The strands of the rope (or cable) are under tension on the outside of the bend radius while...
  5. jared1313

    identify these machines

    I agree they they are a horizontal bandsaw and some sort of a metal brake or shear. Either way, do not be afraid to ask! If they don't like that you asking, then you really ought to find a better job! Like others have said, you better understand the machines well before you operate them and hurt...
  6. jared1313

    Determination of iron alloy used in motor or generator laminations

    Thank you jpts. I did stumble across the name epstein test while trying to google this, but I wasn't sure if there were other methods as well. I thought there might be a way to back out the permeability in a way similar to testing ferrite and toroidal cores and trying to match up to know...
  7. jared1313

    Determination of iron alloy used in motor or generator laminations

    Hi there, I have a BLDC that I would like to model as a generator. How might I determine the type of iron alloy used in the laminations so I can account for this in the model? I thought that maybe there would be an industry accepted method of determining the core material based on hysteresis...
  8. jared1313

    Torque needed to maintain a constant fall velocity

    BOTTOM LINE UP FRONT: I need to roughly approximate the torque required from a rotating eddy current braking device in order to maintain a constant fall velocity of a suspended object on a pulley or cable drum. LONGER DESCRIPTION: I am working on a project where I have cable spooled around a...
  9. jared1313

    need help designing yagi

    Ok, so I'm building a completely adjustable, lightweight, field portable yagi antenna. As of yet, I am not utilizing any baluns or matching devices in order to reduce weight and decrease the complexity of tuning. I am utilizing a straight dipole for the driven element (it is not folded) and...
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