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  1. #1
    Just planning a build of a PSU for a Warco WM18B mill conversion using Teknik Servo motors.

    According to their guide https://www.teknic.com/selecting-power-supply/ 75VDC is the sweet spot for their motors.

    AC is around 232v in my neck of the woods (Cardiff) so I came up with the following spreadsheet for available Airlink Transformers:

    Click image for larger version. 

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    Now my question is do I go for the 25+25 (in series) 750VA or do I go for the 55+55 (in parallel) 750VA

    The motors are good to 90VDC so even at 250VAC input the 55+55 would equal a no load of 86.8VDC

    Will Back EMF be a problem? will be using suitable bridge rectifier and capacitors of course.

    Thanks in advance
    Last edited by Baja-king; 01-04-2021 at 03:07 AM.

  2. #2
    Back EMF needs to be considered, I calculated it on my machine as about 7V - but it depends on the amount of energy in the machine and the size of your reservoir cap(s).

  3. #3
    Quote Originally Posted by Voicecoil View Post
    Back EMF needs to be considered, I calculated it on my machine as about 7V - but it depends on the amount of energy in the machine and the size of your reservoir cap(s).
    Thanks, how did you calculate it? theoretically or practically.

  4. #4
    Theoretically - I worked out the energy in the moving system then using U = 1/2*C*V2 calculated the voltage rise on the cap.

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  6. #5
    Thank you

  7. #6
    Decided to go with the CM0750255

    750VA 25 + 25 in series, I don't think the 2-3 volts are going to be noticeable and I'd rather have the headroom on the bus voltage.

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