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Thread: Variable speed control.

  1. #21
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    Ok, I know nada about ac , dc and such so . Looks like its getting complicated for me . So , I am not sure if i am supposed to be encouraged by your response ? Are you saying , yes , you can use the variable control with this variable dc thing to make it all work and save money in the long run ?

  2. #22
    Razor Vulture sharptonn's Avatar
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    Well, DC motors and controls like this are quite expensive I am certain. To save money and get it done simply, an interchangable pulley setup to change speeds and a regular,common AC motor would be the way to go, I expect. This setup was salvaged by a friend and given to me and it works. In that regard, it is more efficient for me to use it. Otherwise, I would be going with the former!
    "Don't be stubborn. You are missing out".
    I rest my case.

  3. #23
    Senior Member blabbermouth 10Pups's Avatar
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    What I believe to be true from asking a billion times is,,,

    Direct Current motors can be variable. As said , it is because they are made to handle all levels of current on the inside. If the horse power is too low, then you may loose the torque needed to do the work at lower speeds.

    Alternating Current motors are made to handle 1 level of current on the inside. Changing that level creates heat in the motor. Enough heat to melt copper :<0)
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  4. #24
    Razor Vulture sharptonn's Avatar
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    Quote Originally Posted by 10Pups View Post
    What I believe to be true from asking a billion times is,,,

    Direct Current motors can be variable. As said , it is because they are made to handle all levels of current on the inside. If the horse power is too low, then you may loose the torque needed to do the work at lower speeds.

    Alternating Current motors are made to handle 1 level of current on the inside. Changing that level creates heat in the motor. Enough heat to melt copper :<0)
    Well-said, Pups!
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    "Don't be stubborn. You are missing out".
    I rest my case.

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    aka shooter74743 ScottGoodman's Avatar
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    Mine is AC and is variable speed...
    Southeastern Oklahoma/Northeastern Texas helper. Please don't hesitate to contact me.
    Thank you and God Bless, Scott

  7. #26
    Razor Vulture sharptonn's Avatar
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    Quote Originally Posted by shooter74743 View Post
    Mine is AC and is variable speed...
    Yes, this DC motor setup runs on AC current as well. I expect an AC motor which is variable has many differences than one which is a single speed. Brother-in -law will know. I shall ask!
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    "Don't be stubborn. You are missing out".
    I rest my case.

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    aka shooter74743 ScottGoodman's Avatar
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    Keep in mind that my motor is 3 phase though...
    Southeastern Oklahoma/Northeastern Texas helper. Please don't hesitate to contact me.
    Thank you and God Bless, Scott

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  10. #28
    Heat it and beat it Bruno's Avatar
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    Quote Originally Posted by sharptonn View Post
    Yes, this DC motor setup runs on AC current as well. I expect an AC motor which is variable has many differences than one which is a single speed. Brother-in -law will know. I shall ask!
    No. A variable speed AC motor and a fixed speed AC motor are the same. The difference is the drive needed.
    AC engines are controlled by changing the frequency of the input signal. For this, a frequency convertor is needed, and decent ones cost money. Sometimes as much or more than the motor itself.
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  12. #29
    Thread derailment specialist. Wullie's Avatar
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    Got TWO 1HP DC motors in my shop and no controller. :/ Found one on craigslist the other day for $200...... It was more than I needed as it had a tach and some other crud I don't need for a belt grinder so I passed.

    Tom, my motors came off bulk mail machines. Probably the same as the ones you refer to.
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    Str8Faced Gent. MikeB52's Avatar
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    I have a similar lesson drive controlling a variable speed sander I built.
    The input plugs into your wall @ 110 vac.
    The output will drive either a 90, or 180 vdc motor. You can wire the output either way as its a two wire output plus ground set up. It will run both directions depending on how you wire it, white to white, or white to black wire.
    You can get a used dc motor all over, just find the hp, and shaft size you want and you can build from there. Lots of threads from folks on ideas and such.
    Just need to verify input and output connections by removing the cover. Make sure any jumpers are set to the desired voltages and voila.. Now, if you are not comfortable wiring a household lamp, get a bud to help. Ideally with a multi meter to verify everything before you connect your motor.
    Cheers.
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