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Motor for back and forth

Discussion in 'Sensors and Actuators' started by lowyrpc, Oct 16, 2017.

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  1. lowyrpc

    lowyrpc

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    Oct 16, 2017
    I'm building a business sign, and I want it to wave it's hand back and forth. How can I accomplish this? Is there a particular type of motor? If so, I'd prefer it to be DC.
     
  2. kellys_eye

    kellys_eye

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    Jun 25, 2010
    Wind screen wiper.
     
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  3. lowyrpc

    lowyrpc

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    Oct 16, 2017
    That's what I was thinking. Do I need the arms as well, or just the motor?
     
  4. kellys_eye

    kellys_eye

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    Jun 25, 2010
    Depends on the motor - some come with the movement 'inside' (single wiper cars) others rely on external linkages (dual wipers).
     
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  5. Minder

    Minder

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    Apr 24, 2015
    Try and find an auto wrecker where you can strip your own, this way you can use whatever you need or adapt.
    The other option is a linear actuator, but not as cheap, maybe!
    M.
     
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  6. lowyrpc

    lowyrpc

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    Oct 16, 2017
    Thanks for the answers. I have a friend that runs a scrap yard I was gonna talk to him. I could probably use a rear wiper because it's single.
     
  7. lowyrpc

    lowyrpc

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    Oct 16, 2017
    I'm working on getting the parts now. My next question is: Is it possible to power this by solar? Say have a 12v batter that a panel charges. Will that work?
     
  8. Minder

    Minder

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    Apr 24, 2015
    If the system has the capacity, but if the sign is running 24/7, or for long periods at a time, you may have a problem.
    M.
     
  9. lowyrpc

    lowyrpc

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    Oct 16, 2017
    What would you recommend? Where I intend to place the sign really has no power to plug in to. My concern with solar is the battery getting drained and can't recharge
     
  10. Minder

    Minder

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    Apr 24, 2015
    You would need to monitor and document the mean current when the mechanism is in proper operation under different conditions , for e.g. will it be exposed to wind resistance etc.
    M.
     
  11. lowyrpc

    lowyrpc

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    Oct 16, 2017
    Ok, I gotcha...I think lol
     
  12. kellys_eye

    kellys_eye

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    Jun 25, 2010
    ...expanding... the motor power consumption depends on the load place upon it. Heavy 'hands' and/or wind resistance working against the 'hands' will increase the demand on any battery.

    Measure the 'off load' current (nothing fixed to the drive shaft) and you can work out how long a specific battery (if you know its ampere-hour rating) will last - best case.

    Thereafter you will NOT get 'best case' and may need to adjust your thinking/solution depending on how you implement the final design.
     
  13. lowyrpc

    lowyrpc

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    Oct 16, 2017
    Thanks for the help everyone!
     
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