Search found 13384 matches

by John in CR
Jun 06 2008 10:33pm
Forum: E-Bike General Discussion
Topic: Arguement thread!!!
Replies: 58
Views: 3719

Re: Arguement thread!!!

Seem like there're more insults than arguments. Agreed. Let me try to get something going. Apple sucks, and was saved only by the Ipod, which also sucks, along with Apple's inordinate amount of free press. Since when does a company that was in at the beginning, but now holds only a 2% market share,...
by John in CR
Jun 06 2008 7:33pm
Forum: E-Bike Non-hub Motor Drives
Topic: Using RC motors on E-bikes [Archive]
Replies: 1244
Views: 140962

Re: Using RC motors on E-bikes

... in fact I can say with near certainty that this is the next motor I'm buying. For the price per watt it will be difficult to resist. I even have some aluminum housing wheelchair gearboxes that are 24:1 reductions that would be very simple to mate with the output shaft of the motor. Too bad the ...
by John in CR
Jun 05 2008 8:49pm
Forum: E-Bike Non-hub Motor Drives
Topic: Using RC motors on E-bikes [Archive]
Replies: 1244
Views: 140962

Re: Using RC motors on E-bikes

I'm just waiting for a shared diy project describing the build of these types of motors, but meant for our type of use. Forgive my ignorance, but wouldn't it only take an extra couple of turns on the windings and better bearings? Here's a good example of how easy a high power high efficiency motor c...
by John in CR
Jun 05 2008 8:23am
Forum: E-Bike Technical
Topic: How To Ice Up Your Motor? (Cooling Ideas)
Replies: 391
Views: 50025

Re: How To Ice Up Your Motor? (Cooling Ideas)

Safe, Interesting results. What surprises me most is the difference in resistance. How and at what points did you measure it? The reason I ask is that the temperature coefficient of resistance for copper is only 0.004041 per degree C, http://www.allaboutcircuits.com/vol_1/chpt_12/6.html . My guess i...
by John in CR
Jun 04 2008 10:58pm
Forum: E-Bike Technical
Topic: How To Ice Up Your Motor? (Cooling Ideas)
Replies: 391
Views: 50025

Re: How To Ice Up Your Motor? (Cooling Ideas)

Quite a discussion you guys have been having in this thread, and at a minimum you've reinvented the terminology used in thermodynamics, if not attempted to bend some of its laws. I too started my electric bike pursuits with an MY1020 motor, but a 750W 24V model. I even entertained the idea of buying...
by John in CR
May 30 2008 9:36pm
Forum: E-Bike Technical
Topic: 2kw 2 speed brushless hub motor
Replies: 20
Views: 4325

Re: Erato 2kw brushless hub motor help needed

USA Tracy, Thank you so much. I found that site before, but didn't bookmark it and couldn't find it again. 7, I know I'm a noob, but isn't a 20pole 3 phase motor impossible? Looking at the speed switch connections, I think the low speed / high torque setting causes each phase wire to connect to 6 of...
by John in CR
May 30 2008 1:34am
Forum: E-Bike Technical
Topic: 2kw 2 speed brushless hub motor
Replies: 20
Views: 4325

2kw 2 speed brushless hub motor

I picked up an interest hub motor that I'm having trouble getting running. The interesting part (at least for me) is that it has dual windings with a mechanical switch, to creating a high torque low gear and high speed gear. Below are 2 pics of the phase wire connector end with the switch in it's tw...
by John in CR
May 29 2008 8:31am
Forum: E-Bike General Discussion
Topic: Things I learned about ebiking AFTER my first project
Replies: 22
Views: 1903

Re: Things I learned about ebiking AFTER my first project

Unless you're in the 95th percentile of actual construction ability and tooling, going cheap will be more expensive. Just because you might be able to input 200W of effort with your legs doesn't mean a 500W motor is sufficient. Bicycle brakes should have a different name such as "gradual slowing dev...
by John in CR
May 25 2008 10:24pm
Forum: Battery Technology
Topic: Duct Tape E-Bay Lifepo4s???
Replies: 1038
Views: 91750

Re: Duct Tape E-Bay Lifepo4s - 2

Anyone correspond with Ping recently? I've been trying to arrange a couple more packs from him for over a week, but no response. BTW my 2 packs, 36V-15ah ea, are working great. I've had no trouble running them in parallel (no more over-current BMS shutdowns), though Ping recommends against it. How c...