Search found 43 matches

by bigchief
Sep 12 2016 9:23pm
Forum: E-Bike Non-hub Motor Drives
Topic: Would this pinion with rim-rack drive idea work?
Replies: 8
Views: 930

Would this pinion with rim-rack drive idea work?

I was thinking of ways to use a high-RPM RC motor on an ebike, and I had an idea to attach the motor to the fork, similar to the way you would attach a dynamo. Instead of engaging with the tire like a dynamo or a friction-drive motor would, instead I would attach a steel pinion to the head of the mo...
by bigchief
Jun 22 2016 1:50pm
Forum: Large EV General Discussion
Topic: Need help designing a multipurpose low-speed camper platform
Replies: 0
Views: 379

Need help designing a multipurpose low-speed camper platform

I've been working on a project where I was going to add motorcycle-grade in-hub motors to a ~2000lbs camper-trailer, so that it can help push itself while my small EV car (Smart Electric) pulls it. I'm realizing that the better idea might be to just skip the car and hub motors, and create a self-pro...
by bigchief
Mar 19 2011 12:57am
Forum: Motor Technology
Topic: Got a free AC motor, it is strong enough for EV conversion?
Replies: 12
Views: 1464

Re: Got a free AC motor, it is strong enough for EV conversi

Some Googling seems to suggest that this is a discontinued "Belt Drive Condenser" from 1989, whatever that means. Could 15 Horsepower take a very light car (like a Geo Metro) to highway speeds? Or would this be more of an "around town" thing if it works? Is this a three phase AC?
by bigchief
Mar 19 2011 12:38am
Forum: Motor Technology
Topic: Got a free AC motor, it is strong enough for EV conversion?
Replies: 12
Views: 1464

Got a free AC motor, it is strong enough for EV conversion?

Hey guys, I've been into EV's ever since I got my electric bike working about a year ago, thanks in no small part to all of you. Since then I've been dreaming of an electric car conversion. Now, seemingly out of nowhere, my boss asked me to toss out an old motor in the basement of our building. I to...
by bigchief
Jul 10 2010 12:21am
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1118

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

OK, so get a load of this: I completely desoldered the leg of the crimped shunt, leaving only the middle shunt in. I was expecting the bike to have it's speed and acceleration gimped. Turns out the bike is now performing *exactly* the same as when I had both shunts in, only without any blown fuses (...
by bigchief
Jul 09 2010 5:25pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1118

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

Sounds good, I just de-soldered a leg and I'll give it a try. Thanks for the help!
by bigchief
Jul 09 2010 4:19pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1118

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

I attached a picture of the controller opened up. Is it these thingies here? There's markings for three of these jumpers, but only two are mounted. the one in front is bigger and has ridges along the top, and the second one is a smooth looking jumper and is shorter. So I should try filing down one o...
by bigchief
Jul 09 2010 2:10pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1118

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

Oh, I might have thought of something. People here talk about shunting (making a solder pool?) on a controller to draw more amps, right? Could I wick away solder from that area or use a small gauge wire or something to limit the current?
by bigchief
Jul 09 2010 1:36pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1118

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

Does your controller have current limiting? Does the BMS on your LiFePO4 pack do current limiting? Preferably, the controller should be limiting the current, but BMS often includes a limiter to protect the batteries. Usually the BMS is a sharp cutoff, where the controller will just control the thro...
by bigchief
Jul 09 2010 12:26pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1118

Blowing 20 Amp fuses on a 500w Direct Drive Hub

I just finished my new E-Bike; I'm using a 36v, 10amp rated (20amp peak) 10AH LiFePo4 battery with a 20 amp fuse, a 500 watt Direct Drive hub, and a controller of indeterminate wattage. The setup works great and takes me to 20-25mph without pedaling; the only problem is if I floor the throttle at mi...
by bigchief
Jul 05 2010 7:51pm
Forum: E-Bike General Discussion
Topic: Need fast/cheap motor for 36v 10a LIFEPO4
Replies: 5
Views: 582

Re: Need fast/cheap motor for 36v 10a LIFEPO4

I'd imagine it's whatever comes with the http://www.raybenmotors.com/Conversion%20Kits 500watt kit. I'm not sure what the exact rating is but maybe someone else here has the Rayben kit?
by bigchief
Jul 05 2010 10:11am
Forum: E-Bike General Discussion
Topic: Need fast/cheap motor for 36v 10a LIFEPO4
Replies: 5
Views: 582

Re: Need fast/cheap motor for 36v 10a LIFEPO4

I just won a 36v 500w RayBen on Ebay (with controller, rim/tire, throttle and charger but no batteries) for $125 shipped, it says it's lightly used but sounds like I got it at a steal because it's apparently a BaFang motor. My Lifepo4 had a dead cell but I have a replacement; guess it's time to sold...
by bigchief
Jul 04 2010 2:20am
Forum: E-Bike General Discussion
Topic: Need fast/cheap motor for 36v 10a LIFEPO4
Replies: 5
Views: 582

Re: Need fast/cheap motor for 36v 10a LIFEPO4

Also, the Heinzmann I was using that ran so slow was a 36v, 500w, "n=164/min" (I assume this is RPM?). Online I found a Heinzmann that is 24v, 235w, "n=174/min". Do you think there would be a tremendous speed difference if I used that one instead?
by bigchief
Jul 04 2010 2:11am
Forum: E-Bike General Discussion
Topic: Need fast/cheap motor for 36v 10a LIFEPO4
Replies: 5
Views: 582

Need fast/cheap motor for 36v 10a LIFEPO4

So, a while back I bought a 36v, 10a continuous, 10AH LIFEPO4 pack, and a 500w Heinzmann Geared hub motor. The Heinzmann put out a tremendous amount of torque, but the max speed was maybe 10mph. Whatever it was, I could get off and run faster. So, I've still got this battery pack and I'd like to giv...
by bigchief
Jul 16 2009 9:24am
Forum: E-Bike Technical
Topic: My ebike is built! Now how do I get more speed...
Replies: 9
Views: 876

Re: My ebike is built! Now how do I get more speed...

That's interesting, you're both quoting much higher speeds than I'm getting. I'm using a Yi-Yun 36v 500w controller, so maybe that's the issue. On flat ground, I haven't seen the motor go any faster unassisted than I could get off the bike and sprint at, basically. There's a speed around 10mph where...
by bigchief
Jul 15 2009 6:44pm
Forum: E-Bike Technical
Topic: My ebike is built! Now how do I get more speed...
Replies: 9
Views: 876

My ebike is built! Now how do I get more speed...

I just completed building my own e-bike; I used a Mongoose Threshold for the frame, Kenda Kross Slick Tires, a Heinzmann 36v 500w rear hub, and a 36v 10ah LiFePo4 battery. I'm also using a $10 500w brushed controller I got on Ebay and a Hall Effect throttle. Now, I weight 180 and the bike weights ma...
by bigchief
Jun 23 2009 12:15pm
Forum: Battery Technology
Topic: What's the cheapest way to run a Heinzmann 400w 24/36v hub?
Replies: 3
Views: 525

What's the cheapest way to run a Heinzmann 400w 24/36v hub?

So I grabbed a Heinzmann 400w 24/36v motor hub of Ebay and it should be getting to me tomorrow. I'm a pretty epic cheapskate and was wondering what would be the cheapest way to run this thing over several years. I've got a 36v 10ah LiFePo4 battery back on the way, but apparently the BMS is only on t...
by bigchief
Jun 20 2009 12:45pm
Forum: Battery Technology
Topic: LiFePo4 Scam or Deal?
Replies: 2
Views: 446

LiFePo4 Scam or Deal?

Hi guys, I just purchased one of these on a split decision, since I had a 10% off sporting good Ebay coupon that was expiring soon: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250428217355 Now, I have a 24-36 volt, 400w Heinzmann hub wheel coming in the mail soon, and I was planning to power ...