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Recommendations for 60V 20+A DC power supply to test RC brushless motors?

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ci11:
The 1.2 kW DCS and XFR models I use are 1U rackmounts with outputs at the rear. none at the front. These are stacked with other rackmount PSUs below the bench off to one side, leaving the bench for the DUT and often an AWG, a scope, an analyzer and a few DMMs. For my work, there are usually various DC and AC voltages required at the DUT at any one time so this is actually a necessity.

james_s:

--- Quote from: nctnico on October 29, 2022, 11:25:56 am ---Why bother with tinkering while you can get PSUs with adjustable output voltage AND current limit for a reasonable price? For testing purposes where you need different voltages / current limits a server or telecom PSU just isn't the right solution. These will only be worthwhile for a long term (several years) fixed test setup.

--- End quote ---

What is a "reasonable price"? He didn't say he wanted adjustable output voltage or current, if that's needed then it needs to be specified.

For what it's worth, I use a 12V server PSU for testing brushless RC motors on the bench. Almost all of my aircraft run on 3 cell 12V batteries so a 12V power supply is fine. I don't need variable voltage and I don't need variable current, thus my suggestions are based on my own use for the stated purpose.

nctnico:

--- Quote from: james_s on October 29, 2022, 06:59:36 pm ---
--- Quote from: nctnico on October 29, 2022, 11:25:56 am ---Why bother with tinkering while you can get PSUs with adjustable output voltage AND current limit for a reasonable price? For testing purposes where you need different voltages / current limits a server or telecom PSU just isn't the right solution. These will only be worthwhile for a long term (several years) fixed test setup.

--- End quote ---

What is a "reasonable price"? He didn't say he wanted adjustable output voltage or current, if that's needed then it needs to be specified.

--- End quote ---
It says right in the OP's first post. 12V to 50V. Current limiting is very useful for testing high power systems. If something goes wrong then at least the amount of power that can do damage is limited. I don't know if you have ever watched a 70A automotive relay burn out on your bench but I have. Current limiting in the PSU I used saved the day.

james_s:
I've had ESCs fail shorted on several occasions, the server PSU shuts down instantly. The don't have current limiting in the sense of a bench PSU but they have over-current shutdown, you can short the output wires directly and it barely sparks. It's actually annoying at times, if you try to use one to power a brushed motor directly the inrush will usually cause it to trip. On the other hand the LiPo batteries that are used to power these things in the field have no current limiting or protection at all, they tend to cause things to catch fire when something goes wrong.

nctnico:

--- Quote from: james_s on October 29, 2022, 09:30:02 pm ---I've had ESCs fail shorted on several occasions, the server PSU shuts down instantly. The don't have current limiting in the sense of a bench PSU but they have over-current shutdown,

--- End quote ---
The more feature rich bench PSUs have an electronic fuse function (typically called overcurrent protection aka OCP). So you can either have a complete shut-off or constant current as current limiting functions.

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