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  1. #11
    Quote Originally Posted by Jeff View Post
    Thanks guys, really great insights.

    I guess that the lazy ass part of me thought that 48v was good because I could get away with an off the shelf PSU instead of building a 70v 12A linear :)
    Jeff here is the stock answer

    https://www.rapidonline.com/50a-brid...al-case-519318

    https://www.rapidonline.com/samwha-h...acitor-11-3121

    https://www.rapidonline.com/lcr-ep08...-clamp-11-3004

    https://www.rapidonline.com/single-primary?attributes={%22Secondary%20Voltage%22:[%222%20x%2024V%22],%22Power%22:[%22500VA%22]}

    the above is 500va but 625Va will give you a bit more upth.
    Last edited by Clive S; 22-09-2017 at 09:34 PM.
    ..Clive
    The more you know, The better you know, How little you know

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  3. #12
    Jeff's Avatar
    Lives in Filey, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 0-1 years. Has a total post count of 19. Received thanks 2 times, giving thanks to others 3 times.
    Thanks Clive, ordered the 25v-25v 625Va... Bigger is always better :)
    Last edited by Jeff; 22-09-2017 at 10:55 PM.

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  5. #13
    Quote Originally Posted by Jeff View Post
    Thanks Clive, ordered the 25v-25v 625Va... Bigger is always better :)
    I take it you ordered three caps
    ..Clive
    The more you know, The better you know, How little you know

  6. The Following User Says Thank You to Clive S For This Useful Post:


  7. #14
    Jeff's Avatar
    Lives in Filey, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 0-1 years. Has a total post count of 19. Received thanks 2 times, giving thanks to others 3 times.
    yeah, I realised it would be 3 x 4700uF in parallel, thanks again.

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  9. #15
    "Selecting Supply Voltage

    The power MOSFETS inside the AM882 can actually operate within +20 ~ +80VDC, including
    power input fluctuation and back EMF voltage generated by motor coils during motor shaft
    deceleration. Higher supply voltage can increase motor torque at higher speeds, thus helpful for
    avoiding losing steps. However, higher voltage may cause bigger motor vibration at lower speed, and
    it may also cause over-voltage protection or even drive damage. Therefore, it is suggested to choose
    only sufficiently high supply voltage for intended applications
    , and it is suggested to use power
    supplies with theoretical output voltage of +20 ~ +72VDC, leaving room for power fluctuation and
    back-EMF."

    from the AM882 manual obviously check your stepper driver specs first.

    Personally I went with 68v on advice from the forums the PSU build was very easy with Clive S help and I spent longer worrying about it than it took to build which was about 2 hours with 1 hour of pottering, smoking cig and drinking tea.

    Good luck with your build ;)
    Last edited by Desertboy; 23-09-2017 at 11:20 AM.

  10. #16
    I'm using the same motors, am882 drivers and a 68v psu. Got the motors running at 12500mm/min at first testing.

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