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  1. #46
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    Default treadmill motor conversion


  2. #47
    Join Date
    Aug 2021
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    Default

    Quote Originally Posted by robyn2839 View Post
    That one has already been brought up. Problem is no feedback to regulate motor speed.

  3. #48
    BobL is online now Member: Blue and white apron brigade
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    Perth
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    Quote Originally Posted by robyn2839 View Post
    "Danger Will Robinson"
    Check out post #31 which links to a post that describes real power tests on that setup.
    As well as dangerous the power output at low speeds is rubbish.

  4. #49
    Join Date
    Sep 2012
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    York, North Yorkshire UK
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    Default

    Quote Originally Posted by BobL View Post
    "Danger Will Robinson"
    Check out post #31 which links to a post that describes real power tests on that setup.
    As well as dangerous the power output at low speeds is rubbish.
    Hi Bob, Guys,

    The major problem that a SCR/Triac controller has, is once the device is turned ON, that's it until the mains cycle reverses and allows the device to turn OFF.
    Best Regards:
    Baron J.

  5. #50
    Join Date
    Dec 2007
    Location
    Adelaide
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    574

    Default

    I recall that triac speed controllers have been discussed before, they are based on a basic lamp dimmer and while they do vary the speed of a treadmill motor they do not have any form of feedback from the motor to the controller - put some load on the motor - it slows down - the controller is not aware and so does not try to compensate for the speed drop. There may be situations where this is not an issue, but I'm guessing that probably for most metal working machinery it would be unacceptable.

    A 'universal ac/dc motor' ie the brush motor types found in mains operated drills and angle grinders are a different kettle of fish and do work acceptably well with SCR type speed controllers - the back emf voltage generated by of the motor is used as a feedback signal so the controller is able to compensate for load on the motor.

  6. #51
    Join Date
    Sep 2012
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    York, North Yorkshire UK
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    Default

    Hi Familyguy, Guys,

    Its all about the amount of energy under the curve and part of the reason why a large amount of capacitance is required with an SCR/Triac type controller when driving a large DC motor. A PWM type power supply using a DC source will always be superior.

    But you are right there is no controlling feedback to stabilise the motor power output unless it is specifically catered for.
    Best Regards:
    Baron J.

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