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Thread: Would this variable speed controller work?

  1. #11
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    Looks like the motor is capacitor start, probably won't work.
    From another sales website:
    "NOTE: Will not work with soft start or variable speed routers. Will not work with "AC capacitor start induction" type motors."

    Glen

  2. #12
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    Chef Niloc's Avatar
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    Quote Originally Posted by GLE1952 View Post
    Looks like the motor is capacitor start, probably won't work.
    From another sales website:
    "NOTE: Will not work with soft start or variable speed routers. Will not work with "AC capacitor start induction" type motors.

    Glen
    Thank you!
    Yes the motor does have a start capacitor. I read the part that sad
    NOTE: Will not work with soft start or variable speed routers
    I did not know that is what a "slow start" motor was. I did not see or read anything that sad
    [quote]Will not work with "AC capacitor start induction" type motors.[quote/]
    I'm glad I posted this, think the fan controller will have the same trouble here. What does a motor need that has a start capacitor? Or are these types of motors not able to be run at all with V.S.C ?

  3. #13
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    From my limited experience 20 or so years ago it is not possible. Maybe some one has come up with something since then.
    I'd call a motor supply house or even a Graingers and ask.
    These motors work with a centrifugal switch that kicks the main winding in at 75% of rated speed.
    If you mess with the speed you can get a burnt start winding or blown capacitor.
    Not saying it's impossible, but I don't know of any way.

    Glen

  4. #14

    PierreRodrigue's Avatar
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    The best option is a VFD and a 3 phase motor, not a cheep option, but it wont let you down.


    Feel free to visit my website, http://www.rodrigueknives.com
    Email pierre@rodrigueknives.com

  5. #15

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    Colin, is your home/shop wired for 3 phase?

  6. #16

    PierreRodrigue's Avatar
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    The VFD's are phase converters, they convert residential 120 single phase into 220/230 3 phase. With this set up, you will get high torque from your motor across the spectrum of speeds


    Feel free to visit my website, http://www.rodrigueknives.com
    Email pierre@rodrigueknives.com

  7. #17
    Hobbyist Craftsman Hattorichop's Avatar
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    A variable frequency drive is actually a soft start starter.
    It will allow you to ramp up the speed of your motor at a safe rate. This makes the initial starting of the motor a lot smother on the mechanical side of things and also reduces the amount of inrush current drawn by the motor which reduces the arc on the contacts of the starter. And it also provides speed controll.

    A phase convertor is a totally different beast. It will utilize the 2 legs of your single phase power to create a third artificial phase. This is not true three phase power but it is sometimes the only option depending on the transmition line you are taped off of.

    I'm not saying you can not get a combination VFD/phase convertor but this a a very expensive way to try to obtain speed control of a fractional horsepower motor.

  8. #18

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    But variable frequency drives with single phase input always include a phase convertor.

  9. #19
    Hobbyist Craftsman Hattorichop's Avatar
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    Quote Originally Posted by Rottman View Post
    But variable frequency drives with single phase input always include a phase convertor.
    Ok, I've never came across this secenerio. I've always installed vfd's in an industrial setting.

  10. #20
    Mike Davis's Avatar
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    This is the stuff you need.
    http://www.waynecoeartistblacksmith....rs___VFDs.html
    You should grab me one while you are at it

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