I have a little subsecret R&D going on and i realized that I need to find a suitable motor with the following target specs: operating voltage: any, can go as high as ~60-100V with modern ESC's.... but I would prefer to keep it below 30V if possible. Speed under load: 9500RPM Power under load (electrical input) 1000W-1300W any ideas on available hobby motors people?
National Electric Code used to limit you to 48 VDC. But even at that you feel it at anything above 40 VDC. Why so high a target? Most Red Chinese ESC's from Hobbyking can't go more than about 7 cells of LiPo (about 24 VDC), and they can in general be good for our use/abuse.
no real reason other than current consumption... my real needs are power and RPM... voltage is a variable but keeping it within the abilities of cheap chinese ESC's is good. I do want to avoid something like 6V at 216A... 24V at 54A is much more reasonable
Not certain an the wattage of these but they certainly look intriguing. I bet Carl buys some to play with. 3-PHASE BRUSHLESS DC MOTOR | All Electronics Corp.
Look at hobbyking. Turnigy 500 and 600 outrunners fit the bill. The red anodized ones with chromed cans. Some are even as high as 2.5 kilowatt peak power.
Go Big or go home Turnigy_RotoMax_150cc_Size_Brushless_Outrunner_Motor 9.8KW Put that one on your scooter.
Well, since I finished enough preliminary work to decide that I would not be taking the project any further, the motor was for a pump. A rediculously absurd pump that was a not so simple thought exercise on whether one could simply throw money at a pump and get a significant performance increase. The answer was yes. generally speaking it is a 3.3" diameter pump impeller translating into a ~4.5" diameter pump housing running at 8-12k rpm producing ~125psi total pressure rise at ~4 gallons per minute. It probably would have had a 1-2 season life due to blade erosion particularly with plastics, but that would get you ~4gpm out of a 1/8" orifice (maybe a bit more). power consumption looked to be a relatively miserly 800-1300W.... Batteries for ~1hr of operation would run about 500-1000$... use a similar design for a ~2gpm half unit pump
Realistically with any modern set of batteries it could have fit in most of the larger battleships.... sizing it out slightly smaller for the 1/2 unit orifice I think I could shoehorn it into a provence but it would again be a huge expendature of money to keep all the rest ofthe parts in the ship light enough to accomadate it... it was mostly a thought/numerical experiment to see what could be done if I followed the pump design laws coupled with some info I learned recently about low Ns pumps.... it will never be built for several reasons beyond cost... besides, I am more interested right now in an interrupterless, easy to build by hand cannon that works off my air compressor but needs further testing...
So you didn't really build it? Just math? I find that real would testing is the only way, math is just math not water.
well that and the utilization of some weekend training on some software packages that are intended for the purpose. I don't have a spare grand laying around to build and test something that I would never release.
I've seen enough of Greg's work to know that if he says the math works and the model in sim works then the real thing would work. Unfortunately this isnt something you can knock together on your workbench or run off on ye old FDM printer.
Nah, yes you can build a prototype and yes math helps but it does not equal a real test. I think I know how to build a pump.
