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| Recommendations for 60V 20+A DC power supply to test RC brushless motors? |
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| zrq:
What about mobile base station "rectifier module"s . In the part of world I was in few years ago, Emerson R48-2900U was very common in second-hand market and I clearly recall there was a tutorial about how to mod them to make them output 60V. The annoyance with this specific model is it have a soft start feature than ramps up the output to set point in a minute, not sure if it can be disabled or not. There should be some newer models can be modded without this problem and have even higher power density. |
| james_s:
Actually there are a lot of those telecom rectifiers out there, they're very similar to scaled up server PSUs and with a default of 48V they're pretty close. There might be enough range to just dial one up to 55V without hitting the OVP. |
| thm_w:
--- Quote from: james_s on October 28, 2022, 11:44:42 pm --- --- Quote from: thm_w on October 28, 2022, 10:58:28 pm ---Ah I see yes if the chassis is no longer grounded. I would not want to do that, if possible, keep the chassis grounded and just disconnect the output. In some cases this can be done. There is a plugpack that I use where they run a green earthing wire from the mains in to output, if you cut that the output is now floating safely. --- End quote --- Huh? Says who? I lift the DC ground from the chassis, I don't lift the earth ground. The chassis stays safely grounded, only the output is now floating. --- End quote --- Above, as I said, I would do as you recommend, keep the chassis earthed. --- Quote from: nctnico on October 28, 2022, 11:23:14 pm ---I'd look for a brand called 'Gophert'. They make a whole range of switching power supplies that are low cost, are of reasonable quality and should cover this application. Likely the (ab)use of old telecom / server power supplies is even more expensive. --- End quote --- Two of these: https://www.aliexpress.us/item/3256803507137876.html $450. Don't know where the spec for o/p to ground max voltage is. |
| nctnico:
--- Quote from: thm_w on October 29, 2022, 12:41:36 am --- --- Quote from: nctnico on October 28, 2022, 11:23:14 pm ---I'd look for a brand called 'Gophert'. They make a whole range of switching power supplies that are low cost, are of reasonable quality and should cover this application. Likely the (ab)use of old telecom / server power supplies is even more expensive. --- End quote --- Two of these: https://www.aliexpress.us/item/3256803507137876.html $450. Don't know where the spec for o/p to ground max voltage is. --- End quote --- 60V DC shouldn't be a problem. At least these PSUs are designed with floating outputs, current limiting and adjustable output voltage. This one looks closer to what the OP is looking for in a single box: https://aliexpress.com/item/4000352693776.html |
| LCA078:
You guys are great- I love the responses and bickering. Reminds me of my younger days when I repaired military avionics and listened to the Chiefs going back and forth with each other on how to troubleshoot aircraft. I miss having a well equipped bench like I did back then. Now it's just a folding table in my garage with DMM's. Not even a cheap scope. :palm: For this project I was hoping to find something like an older, but good name, power supply on ebay but no dice. And yes, I don't mind hacking something together but just prefer to buy off the shelf if easier. And also much safer than using 3 automotive batteries in series without fuses... :scared: --- Quote from: nctnico on October 29, 2022, 12:47:41 am --- This one looks closer to what the OP is looking for in a single box: https://aliexpress.com/item/4000352693776.html --- End quote --- Yes! That's what I was hoping for- a simple PSU. Hopefully it's fairly clean on the output. Looks pretty solid. --- Quote from: thm_w on October 28, 2022, 10:35:23 pm --- Heres a wanptek 60V 20A for $200: https://www.aliexpress.us/item/3256801282757612.html Quality unknown. This person never reviewed theirs: https://www.eevblog.com/forum/testgear/wanptek-kps-series-power-supplies/ --- End quote --- I saw this one in a video before I posted my first post. It looks like it's doing a decent job so I wondered if there are other PSU's out there for a bit more $ but much better on quality. The Gophert looks pretty nice with the extruded aluminum case. Hmmm... might be worth it to buy one of each and see how they do. |
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