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  1. #1
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    Default motor variator

    Hello everyone,
    I come seeking help to find a drawing of an electronic speed. For a pin
    The spindle is a ripper, with 220 V 50HZ
    this device will work with EMC.
    This is mainly for starting and stopping of the spindle by the PWM instruction.
    I wish to make myself
    I find it very dificult to find what I want on the Web!
    Maybe one of you has it on his desk?
    Thank you for help
    JEAN

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  2. #2
    Community Moderator Al_The_Man's Avatar
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    Is this for a PWM motor control circuit? Is this a Universal AC series motor?
    If so do a search here for the SuperPID, it may not be worth building?
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

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


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    thank you AL
    It is for a PWM control and a universal motor I'm looking for this product.
    But I wish to make myself to learn electronics.
    Not all electronics, but still a bit!
    My job is precision mechanics, electricity has always made me a little scared.
    So the time has come to learn

    JEAN



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    Community Moderator Al_The_Man's Avatar
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    You ARE jumping in the deep end!
    Are you sure you want to control by PWM and not TRIAC?
    There is a Motorola IC that was intended for the purpose, see DXF file.
    The tricky thing is applying a Tach, which you really need anyway on a Universal motor to obtain accurate speed control.
    Al.

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    CNC, Mechatronics Integration and Custom Machine Design

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


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    thank you AL
    With these documents, I can get to work to finally understand how it works and why it works like this!
    As you said so well, I skip the "feet first" in a world still unknown to me.
    But even if my English is aproximation, thanks to the net all become possible.
    John



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    Hi Jigour, the problem with just using PWM to reduce the motor voltage is that universal motors respond poorly to voltage control, and the motor cannot be slowed down very much before the torque becomes very low. If you want to see an example you can buy a $35 "drill speed controller" from Harbour Freight or other hardware store and see that you can turn down the speed a bit, maybe to half speed, but not have much power at low speeds.

    Commercial manufacturers (that make routers with speed controllers built in) get around this by putting some closed loop system in the router usually they just measure current and compensate the control voltage based on current. That helps but still only allows good speed control down to about 10000 RPM.

    Some of the decent routers already have good speed controllers built in, like the Hitachi M12VC and some of the PorterCable (Colt) models. Kress makes good routers too in Europe.

    If you want really good speed control the SuperPID product uses a computer chip doing hundreds of measurements and calculations per second to keep the router running at the right speed with good power. It also allows connection to Mach3 so Mach3 can control the speed and start/stop. That's not something you can easily build yourself, even someone who is an expert with electronics and computer programming will still need a lot of work tuning the control system to work well and not be unstable.



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