115Vac to 130Vdc diagram for gearmotor

Thread Starter

hang glider

Joined May 27, 2009
9
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!
 

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radiohead

Joined May 28, 2009
514
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.
 

Wendy

Joined Mar 24, 2008
23,421
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.
 
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