Combined Solenoid

Discussion in 'General Electronics Chat' started by squatchy, Dec 27, 2012.

  1. squatchy

    Thread Starter Member

    Nov 21, 2012
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    Sorry if I'm asking too many questions about solenoids. I'm exploring a lot of options on developing a fast/accurate linear actuator and playing with different kinds of solenoids seems my best bet.

    The current attempt is shown below. Any flaws in this set up? Concerns? Obvious idiocy? Thanks.

    [​IMG]
     
  2. SPQR

    Member

    Nov 4, 2011
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    What is the behavior you are looking for in the "larger" solenoid?
    Total stroke length of "X" cm.
    Total pulling/pushing strenght of "Y" lbs/kg.
    Voltage you wish to use to control it?
     
  3. crutschow

    Expert

    Mar 14, 2008
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    What do you mean by "linear"? A standard solenoid does not have linear movement with current unless you have negative feedback using a position sensor.
     
  4. ramancini8

    Member

    Jul 18, 2012
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    There is a type of linear solenoid, and it was developed by Clinton Shepard of Mountain Home, Arkansas.
     
  5. squatchy

    Thread Starter Member

    Nov 21, 2012
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    The desired behavior is basically a solenoid that is not binary in nature. A basic solenoid is either "all in" or "all out". Extended or retracted.

    I want to build or find an actuator that moves in one dimension to a controllable degree, does it accurately and does it quickly... and I'm wondering if a modified solenoid could achieve this.
     
  6. shortbus

    AAC Fanatic!

    Sep 30, 2009
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  7. squatchy

    Thread Starter Member

    Nov 21, 2012
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    Pretty much what I'm looking for except these look really slow. I'd be using them for an animatronic application so it'd be ideal if the plunger could go be manipulated at a rapid pace.

    That said, I realize I'm asking for all the benefits of a variety of different devices without any of the sacrifices. I guess I'm just amazed there is nothing like this out there currently (a simple, cheap, fast, precise linear actuator component).
     
  8. John P

    AAC Fanatic!

    Oct 14, 2008
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    It's called a "voice coil drive". But it's only usable over a short stroke. How much travel do you need?
     
  9. squatchy

    Thread Starter Member

    Nov 21, 2012
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    A couple inches would work. I suppose this is not possible.
     
  10. Jaguarjoe

    Active Member

    Apr 7, 2010
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    Have you thought about pneumatics?
     
  11. SPQR

    Member

    Nov 4, 2011
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    Disney uses pneumatics (mentioned by Jaguarjoe) and hydraulics.
    But you can increase your speed significantly by using a lever, just like the heads on a hard drive.

    A fast stepper, a lever and a screw might be a way to go.

    Some of the original audioanamatronics (Tiki Room) were/are just solenoids.

    Newer technologies are out there such as this nano precision actuators - fast, long stroke.
    www.nanoactuator.com
     
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