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Adjustable speed motor

Discussion in 'Sensors and Actuators' started by Leonord, Jun 14, 2012.

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  1. Leonord

    Leonord

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    Jun 14, 2012
    Hello everybody,
    Im a total newbie in electronics but I have a cool project idea that needs a special motor.
    I need a motor with an adjustable speed.

    Any ideas or help to build one?

    Edit:
    Seems like I forgot a lot of details.
    I need a motor that can run all the time at a realy precise constant slow speed.
    The motor will run a mechanical clock. Is must move a 2 meters long belt.
    I want to be able to change the speed of the motor whenever I want because I dont know the final exact lenght of the belt or the dimensions of my clock.
     
    Last edited: Jun 14, 2012
  2. donkey

    donkey

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    Feb 26, 2011
    all motors can be adjusted in speed. using pwm.
    if you give us power requirements then we could possibly show you a circuit.

    oh and welcome to the forums
     
  3. duke37

    duke37

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    Jan 9, 2011
    There are many motor types which can be varied in speed, they go from cassette recorders to locomotives.

    You need to specify power, speed, speed regulation, torque, voltage supply etc.

    Building a motor would be very difficult.
     
  4. Leonord

    Leonord

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    Jun 14, 2012
    Is it possible to adjust precisely the motor with pwm? I need it for a mechanic clock.

    Edit: I mean building the circuit not the motor xD
     
  5. CocaCola

    CocaCola

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    Apr 7, 2012
    Better stated building a reliable, high performance and high quality one is difficult...

    I built one as a teen in high school for general shop, nothing to write home about I was just some hunks of steel and some winding wires, but it did spin...
     
  6. Leonord

    Leonord

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    Jun 14, 2012
    I just added the project details to the first post.
     
  7. CocaCola

    CocaCola

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    Apr 7, 2012
    You need a stepper motor and a controller to run it...
     
  8. donkey

    donkey

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    Feb 26, 2011
    if its for a clock then the simplest idea is to get a normal motor and gear down the speed, in most cases this increases torque as well.
    power requirements is still not added here
     
  9. donkey

    donkey

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    Feb 26, 2011
    you don't NEED a stepper motor, it is easier that way. but if you goto nearly any basic craft store they will have a cheap clock you can pull apart to get the basic concepts.
    anyway what sort of power you looking at running it on?
     
  10. Leonord

    Leonord

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    Jun 14, 2012
    I want to plug it to 220v
    I'll need a transformer of course.
     
  11. donkey

    donkey

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    Feb 26, 2011
    a plug pack would suffice. as coca cola said the easiest way is a stepper motor. to keep it accurate you could simply put an IC in to give digital time an when the second hand or minute ticks over inside the stepper motor will move an increment. this will provide an accurate timer. I would off course put in a secondary system in case you need to adjust the time. gear ratio and torque requirements I can't give you because of 2 very important factors
    a) you haven't told us size or weight yet
    and b) I wouldn't have the foggiest idea of how to calculate it unless i refer to the wise old google.

    also i understand you want a clock, and a belt. does the belt drive the clock or does the clock drive the belt? and if it is the latter. for what purpose?
     
    Last edited: Jun 14, 2012
  12. donkey

    donkey

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    Feb 26, 2011
    I also had an idea regarding keeping the motor speed in check is you could use something very simple like a magnet on the side of a gear and a reed switch, whenever the gear rotates it will close the reed switch. if you use the signal to calculate how fast it SHOULD spin you could adjust speed accordingly
     
  13. Leonord

    Leonord

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    Jun 14, 2012
    Thank you very much guys. So a steeper motor with an IC (no a idea what that is).

    I'll do some more research an come back when I have more details about the needed power.

    To start thinking about the control unit.. Should I get first the apropiate motor or the motor specifications don't matter?
     
  14. donkey

    donkey

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    Feb 26, 2011
    ok leonord just a quicken, an IC is an integrated chip. there are ones that are used for timing. for exmple the 555 timer. you can set these to output a signal every second (pretty precise too) and that will give the stepper motor the signal to move 1 increment.
    number 2 I may be a vip on the forums here but that in no way means I am the smartest, in fact I would say I just know a few words that sound good. My idea is sound, but putting it into practise is another issue.
     
  15. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    May 8, 2012
  16. donkey

    donkey

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    Feb 26, 2011
    very good observation. I meant all motors speed can be adjusted, and pwm is one way. gear ratio is another
     
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