115Vac to 130Vdc diagram for gearmotor

Discussion in 'General Electronics Chat' started by hang glider, May 28, 2009.

  1. hang glider

    Thread Starter New Member

    May 27, 2009
    The newb is back...
    Thanks for the assistance so far. I think I'm really close here...
    Although the drawing is quite rough, can someone give it a glance and give me a thumbs up, down, suggestions? I viewed the related thread, but no indication of how to get down to 92V - so a little homework and this is what I've come up with. However, do I loop the R2 back to the other AC lead (or actually ground it?)

    sincerest thanks for any help!
  2. radiohead

    Distinguished Member

    May 28, 2009
    After the voltage passes through the bridge, there will be a drop because of the two forward biased diodes. At the DC output of the bridge, string about four or five diodes in series (forward bias) between the + and -. Adjust the number of diodes until you achieve the desired voltage. Use appropriately rated diodes. 1N4007 (1,000v) for example.
  3. Wendy


    Mar 24, 2008
    You will be much better off using some form of PWM to feed the DC to the motor. Be carefull, these voltages are deadly, and will take you out in a heartbeat (no pun intended). Basically those resistors are going to get hot Hot HOT!, so some other method is recomended.
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    Heee heee heeee. U are gonna go poooooooooof!! this time glider :D