Will upgrade from 36V to 42V PSU help?

[Joey Legaspi]

Hi Brian!

I have the 305 oz-in motors and 36V 14A switching PSU. My gantry is on the heavy side. Even with two motors I can drive it only to a maximum velocity of 60 mm/s. I go faster than that the one of the motors stalls.

I’m thinking of purchasing a 42V PSU. Will it help improve the gantry speed? Thanks!

[BrianV]

Short answer: Yes.
Longer answer: By how much, I don’t know.

I wonder just how well/quickly a switching regulator can adapt to changes in current demand and absorbing the regenerated power from the motors. As a GENERAL rule, switchers have smaller output capacitors as too much capacitance will interfere with ability of the switcher to respond quickly to voltage/current changes. I have zero proof to back up my thoughts, and I’m not going to experiment to find out.

http://www.elmomc.com/applications/Power-Supply-for-Servo-Applications.htm#11

Just be cautious with super-cheap, no name, chinese, eBay power supplies. They are inexpensive for a reason. Check my blog post The lowest price DIY CNC electronics isn’t always the best value.

Let me know how it works out.

BrianV

[Author]

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