Harold in CR wrote:Did we lose a bunch of photos with the latest Site updates ??? I find many "File does not exist any longer" notices when I click on a download to see a photo ????????
John in CR wrote:My main hubbies, comparable to the new Xlytes, but with a 40mm stator and a higher Kv at 16rpm/V even blew the super Methods controller, 18 by 4110fets and beefed up everything, the 2 days after LFP left last year. It's the current limiting that kills them staring down the barrel of the low resistance windings that need almost 30mph in a 20" rim before BEMF gets strong enough to help control things.
I don't know what's wrong with Hubmonster's factory controller. I thought I could get away with doubling the current with a 200lb lighter vehicle and the controller much more exposed to the wind, but it couldn't handle it and I wasn't even riding it near max performance.
Everyone seems to have trouble once you cross the 100A barrier, and further evidence is the Chinese going to monster size motors so they don't have to cross it. Arlo1 has had the best luck pushing them well beyond that, but that's with an X5304 which is a far easier load. I have an X5304 that was running fairly conservatively, and I took the controller off of it to run on one of my main hubbies in a 20". It took off way stronger than the X5 was running, but the controller blew the first time I gave it full throttle, a result that still baffles me.
The Sevcon's Luke has for brushless are apparently up to the task, but the setup is a mountain I don't have the tools to cross.
I've had luck with my Lyen 24fet 4110 controller...realiable since Sep of last year, but I did tone the settings down to 80A after running at 110A for a little while to make sure it stayed reliable. I beefed up the traces, doubled up the 10ga phase wires, and halved the shunt resistance to double the regen current. I was planning to add to blowers to bring in fresh air and keep the insides cool as well as almost double the surface area for FET cooling, all with plans to run Hubmonster with it, but now I need to put it back on my daily rider since I'm out of controllers. Blue is down for a quick overhaul (better batts, new wiring harness and bearings, and some beautification) while we're in the meat of rainy season, but I'll keep it conservative until I get another bike going.
I thought I was done with controller problems after learning hard lessons about current limiting, partial throttle, and hills. A year of zero problems really spoiled me, but now that I'm reaching for more performance controller popping is back and it sucks.
John in CR wrote:Beautiful info Arlo1. I haven't been following your work on inductance as closely as I should. Did you measure inductance or was it easily calculated. So it's the inductance that's been killing my controllers, since I'm sure mine are even lower than the HS motors. Have you been able to source any big cores to wind our own toroidal choke coils?
I've got enough magnetite for a few, and it's easy and fun for the kids to collect with a magnet at the beach. I was thinking epoxy+magnetite doughnuts to wrap my phase wires through could be a cool DIY low loss, low force solution. What do you think...worth a try?
The Mighty Volt wrote:John, just curious, why is there a need for 150Amps???? Are you just pushing the limits for the hell of it, or is there a need to run those suckers at those amps, or do they just draw that sort of amperage of their own accord once you apply a pertinent voltage at WOT?
John in CR wrote:The Mighty Volt wrote:John, just curious, why is there a need for 150Amps???? Are you just pushing the limits for the hell of it, or is there a need to run those suckers at those amps, or do they just draw that sort of amperage of their own accord once you apply a pertinent voltage at WOT?
More acceleration of course. I'm not pushing the limits like LFP and Arlo1 do. This motor can handle it no problem. The controller can handle it and more too, as long as there's enough inductance. You'll understand better once you get your motor going. It makes you want more. After I get my cargo bike daily rider back on the road after the overhaul, then all other bikes are for fun. Fun for me is turning the throttle and getting exhilarating near silent acceleration from a vehicle I built myself and that runs on pennies. You like amusement park rides don't you? Ebikes can do that. I've only had a taste, but have the equipment to pull it off.
John in CR wrote:I don't think it's a good choice for a rickshaw unless you did it as a mid-drive, but I assume that rim is permanently attached. That motor wants more rpms, and appears to either be the same as my main motors or a knockoff. Are there raised chinese symbols in the motor cover? If the winding is the same, then you're looking at 16rpm/volt, and for planning purposes on hills or with a heavy load you want to get to and maintain close to half of no-load rpm for that voltage. For a rickshaw with hubbies, I'd recommend dual motors and slow speed wind motors, but mid-drive I believe is the way to go, since room under the rear seat is plentiful, and you can tune the gearing to suit your needs. Maybe you can get away with it as a rickshaw hubbie with the lowest profile tire you can find for that rim.
E-bike4life wrote:Is this the same motor you used? http://www.alibaba.com/product-gs/46266 ... oters.html
The Mighty Volt wrote:I'm just bumping this thread for the benefit of Beavinator who requested more information on these motors.
John in CR wrote:The Mighty Volt wrote:I'm just bumping this thread for the benefit of Beavinator who requested more information on these motors.
The Beave needs to learn to be a man and stand on his own 2 feet a lot more, which would include learning to use the search function. He's just lazy, impossible to please, and has money to burn. Whoever thinks the Beave should just buy a Stealth Bomber and be done with it, raise your hand.
RallySTX wrote:It is, the parts are bigger, and there's more of them. So there's more places for you to hide a mistake. Make a boo boo on one of these and there is no way to hide it. I drove my v8 S10 for two years in WI. That thing had more mistakes than I care to mention, but it still would spank a Camaro. Mess up on a harness, or Tourqe reenforcement, and you got problems baby!
ohzee wrote:That Sucks.. ;(
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