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| Recommendations for 60V 20+A DC power supply to test RC brushless motors? |
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| LCA078:
Hello All- New guy here looking for an 'okay' adjustable DC power supply to provide 20+A at a min of 60V (55V continuously). More than likely I need to buy a new Brand X PSU unless someone here on the forum has a domestic one they need to get rid of quickly. I'm located in the US so 110V is best as I don't have 220V at my bench...yet. I'll be testing fairly large electric ducted fans (EDF) systems powered by brushless dc motors (BLDC's) common in the RC plane market like this one: https://hackermotors.us/product/stream-fan-120mm-kv700/ While these things are designed to handle monstrous power (5kW+!!!) for max thrust, I'll be testing them at the much lower power settings of 150-500w to test airflow efficiencies relative to battery pack power supplies. None of the manufacturers test outputs in this low range because basically it's just a fan at these low power settings and not a propulsion system. I'll use the DC power supply to mimic various arrays of lithium battery packs (12-50V) powering the motor's electronic speed controller (ESC) which produces the 3-phase power for the BLDC which means I'll primarily be in constant voltage mode only. Here's a typical ESC I'll be using https://hackermotors.us/product/mezon-evo-80-bec/. My intent is to produce low-power airflow efficiency curves (0-30% max motor power) to find the sweet spot of combinations for fan/motors and then perform VERY basic durability testing (ie- the fan/motor combo doesn't burn up after a few hours). More than likely I'll stay under 500W max for any motor because I can't handle that much continuous power draw from the final application. My sweet spot power draw will be 200-300W continuous for 4-8hours for optimum weight/power....but I digress. As you can tell, I don't need "precision" but would like a nice PSU if price is right. Duty cycle might be a problem but this is why I'm posting here for feedback. Trying to stay in the sub $300 range if possible but open to higher $$ for the quality as needed. And yes, I have a decent background in electronic/electrical engineering but just not in this range of power supplies. Thoughts? |
| Martin72:
Hi, On german websites I´ve found this here: https://www.metro.de/marktplatz/product/0cc4f732-c30b-4a0d-9921-2267ea7e5468 1200W output power, not bad... Should be also avaible outside europe, for searching here the full name: Stamos S-LS-41 |
| tautech:
--- Quote from: LCA078 on October 28, 2022, 07:47:26 pm ---Hello All- New guy here looking for an 'okay' adjustable DC power supply to provide 20+A at a min of 60V (55V continuously). More than likely I need to buy a new Brand X PSU unless someone here on the forum has a domestic one they need to get rid of quickly. Thoughts? --- End quote --- Welcome to the forum. 55V @ 20+A is a good ask especially with a $300 budget. Looking at Siglents lineup the SPS5082X meets your requirement but the darn lead time is 8 weeks :-- https://siglentna.com/product/sps5082x/ I have the 40V 60A SPS5042X and it's quite lightweight being SMPS and has a narrow but long footprint. Here's the whole range: https://siglentna.com/products/dc-power-supply/sps5000x-series-switch-mode-power-supplies/ |
| james_s:
A very cheap way of doing this is to modify 12V server PSUs by isolating the DC ground from earth ground and then connect them in series. You *may* have issues with insulation floating the output at such high voltage but I think there is a pretty good chance of it working. I routinely use a pair in series, I have run as many as 3 before for 36V and for 60V you only need 5 of them. They're so cheap on the surplus market that if it blows up it's not a huge loss, normally you can get them for little more than the cost of shipping. |
| Martin72:
This is very risky in multiple ways.... |
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