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Thread: Ball Bearing Motor Proposal HELP!

  1. #1 Ball Bearing Motor Proposal HELP! 
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    Hello,

    So I am wondering how long I can short out a battery until it explodes? I need to know how I can short out a battery for brief periods of time. For the ball bearing motor to work I need to short the battery to heat the ball bearings up. Can the battery attach to something first to prevent battery damage, but if so will it still produce the effect of the electrical shortage? So basically what I am asking is what do I need to protect my battery from self produced electrical shortage?


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  3. #2  
    Forum Professor jrmonroe's Avatar
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    Yes, what you describe is potentially dangerous. It is definitely not clear how shorting a battery will heat ball bearings. Could you give us a better explanation of why and how you want heat the ball bearings?


    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  4. #3  
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    Here are some links to explain what I want to build.
    I would be most appreciative if someone could explain to me how I would keep the power source, in my case it would be a motorcycle battery, from becoming damaged from the virtual short circuit.

    http://www.electricstuff.co.uk/bbmotor.html
    http://en.wikipedia.org/wiki/Ball_bearing_motor
    http://www.fdscience.org/uneko/bbmotor.html
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  5. #4  
    Forum Professor jrmonroe's Avatar
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    I can't see how it works, and I don't recommend using a battery due to the danger involved. The third link describes a battery as a current source, which technically, it's not.

    What kind of current do you what to achieve?
    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  6. #5  
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    the amount of current needed would be around 200 amps possibly even 300. My knowledge of electrical propeties is slim so I am only estimating. I was hopingthis would be a simple project but It has a few complications such as the power source, which needs high current out put but also be of little weight.
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  7. #6  
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    To begin with, when you're talking 200 to 300 amps out of a motorcycle battery, you're talking under — probably well under — 5 minutes of use. To limit the current, use a current limiting resistor.
    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  8. #7  
    Forum Professor jrmonroe's Avatar
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    To begin with, when you're talking 200 to 300 amps out of a motorcycle battery, you're talking under probably well under 5 minutes of use. To limit the current, use a current limiting resistor.
    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  9. #8  
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    i only need to use it for a few seconds at a time in the first place. the motor would only be connecred to the battery for short bursts.
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  10. #9 Ball Bearing Motor Proposal HELP! 
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    Use headlamp bulbs as current limiters. They give a high inrush current till hot, then tend to stabilize the current as other loads vary. If you use small bearings for your trials you'll never need 200A. Headlamp bulbs can give you 6A or more each, so you can use lots in parallel.
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  11. #10 torque 
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    so i asked my friend about some equations i found on ball bearing motors and he said the torque generated by this is mininmal. is this true about ball bearing motors and if so how do i increase the torque. my initial plan was to use these motors to propel myself but perhaps not if they do not produce enough torque.
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  12. #11  
    1 Ugly MoFo warthog213's Avatar
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    Quote Originally Posted by JorEveUSA View Post
    so i asked my friend about some equations i found on ball bearing motors and he said the torque generated by this is mininmal. is this true about ball bearing motors and if so how do i increase the torque. my initial plan was to use these motors to propel myself but perhaps not if they do not produce enough torque.
    What I read says that the ball bearing motor needs a push to start rotating which means this type of motor has very little power....
    (warthog) an ugly little animal in Africa that is hunted, killed and eaten by lions.

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