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Manual Speed Control

Discussion in 'Grinders' started by krash-bang, Mar 18, 2016.

  1. krash-bang

    krash-bang Active Member

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    Hi Everyone,

    I have a question.

    I kind of lucked out and I'm getting a 1hp AC electric motor from a guy I know for free. I was telling him about how I would like to be able to have variable speed, so he checked with his commercial electrician friend (I new a guy that new a guy kind of story)who said he would check into it. Any way, to make a long story longer, he suggested I used a manual speed control device. It's called a Phason MCS4 Manual Speed Control. He sent me the user manual in .pdf file but it really doesn't say how the speed is changed. Would this be considered a VFD system? I thought those things were in the very high hundreds. He told me it would be under $300. Would this be a good, efficient way of running an AC motor on a knife grinder?

    Thanks

    Serge
     
  2. dancom

    dancom Dust Maker

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    Hi Serge,

    This is a fan motor speed control for permanent split capacitor type motors. The MSC-4 is suitable for 1/2 horsepower motors @ 120 VAC or 1 horsepower motors @ 230 VAC.
    IMHO I wouldn't want to use this on a motor getting any serious work. The two stepped sheaves and belt is a better plan for variable speed.

    If you are interested in a single phase VFD, a good quality 2 horsepower drive can be had for around $250 CAD. You'd need a three phase motor to go with it though.

    Dan
     
  3. Yamroll

    Yamroll New Member

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    I agree with Dan. For speed control with that motor, the best bet would probably be to get a couple 3 step pulley sheaves and move the belt to increase or reduce the speed slightly. Not a lot of range and a bit of a pain in the butt to change, but, probably more reliable.
     
    dancom likes this.
  4. dancom

    dancom Dust Maker

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    So far, no one has made a good variable speed single phase motor option. Dimmers work great on lamps, but they are crap on inductive loads like motors.

    Calling all electrical engineers...something to aim for!

    Dan
     
  5. krash-bang

    krash-bang Active Member

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    Thanks guys. I agree with what you're saying. I'm going to go with the stepped sheaves. It's the simplest solution for now.

    I really appreciate your input guys.

    Thanks,

    Serge
     
  6. John Noon

    John Noon Well-Known Member

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    Look into variable speed belt drive, it has two cones with opposite taper.
    Technically a infinitely variable drive
     
  7. krash-bang

    krash-bang Active Member

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    Good idea. Thanks, I'll check into that as well.
     
  8. John Noon

    John Noon Well-Known Member

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    Hey this is Canada find a old snow machine clutch and drive assembly and you would be good to go
     
    krash-bang and Grizz Axxemann like this.

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