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IndustryArena Forum > CNC Electronics > General CNC Machine Related Electronics > accurate single phase ac motor speed control
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  1. #13
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    I'm not sure. Is there simple way to tell from looking at the outside of the motor from a picture (equipment is not at my present location)?

  2. #14
    Community Moderator Al_The_Man's Avatar
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    Often the rpm it runs at will be an indicator, if (a lot) more than 3450 rpm then it will most likely be Universal, also if you can see commutator or brushes.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  3. #15
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    I think the motor is 3480 rpm. That's about all I really can tell.

    If it's not a Universal then are there options for accurately controlling the speed?

  4. #16
    Community Moderator Al_The_Man's Avatar
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    Then it is most likely induction, if so then the options are virtually none I'm afraid, at least with that motor.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  5. #17
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    Just finally found out from the supplier that it doesn't have brushes so that bumps me out unfortunately.

    Why doesn't one of you figure out how to control the speed of these motors with something cheap like an Arduino... make a million bucks

  6. #18
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    Hi, we all have this problem when it come to single phase motors........usually solved for speed control with a variety of mechanical devices like belt drive and/or gearboxes etc.

    I went to 3 phase specifically because the problem of single phase speed control was beyond me, but more because the whole spectrum of 3 ph motor availability for next to nothing was a fact of life.

    I invested in a 3/4 hp VFD that converted the 240 volt single phase mains to 3 phase and that has complete motor control from speed down to braking......all for about $200 on EBAY.

    Now motors that are considered scrap value are real gold.
    Ian.

  7. #19
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    Sounds like good advice, thanks handlewanker

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