Search found 1265 matches

by dumbass
Oct 16 2014 1:11pm
Forum: E-Bike Non-hub Motor Drives
Topic: Loud Currie Gear Reduction Motor
Replies: 98
Views: 15504

Re: Loud Currie Gear Reduction Motor

I would highly recommend using a sealed bearing on the outer side. It helps prevent water and dirt getting in and hot thinned grease from getting out.

Bob
by dumbass
Oct 15 2014 2:24pm
Forum: E-Bike Non-hub Motor Drives
Topic: Loud Currie Gear Reduction Motor
Replies: 98
Views: 15504

Re: Loud Currie Gear Reduction Motor

LeftieBiker wrote:Thanks for the info! Have you replaced the bearings on the bevel-geared motor, or just the straight-cut version?
My motors are all the old style srraight geared motors.
by dumbass
Oct 13 2014 10:58am
Forum: General Discussion
Topic: Can you recommend a translation service?
Replies: 7
Views: 543

Re: Can you recommend a translation service?

Hello, I'd enjoy hearing from those on this forum that have used a translation service or two and mention who they recommend. The service I am looking for doesn't involve voice communication. Thanks I can't recommend an actual service but I've used Google translator for years. Just cutting and past...
by dumbass
Oct 13 2014 10:45am
Forum: E-Bike Non-hub Motor Drives
Topic: Loud Currie Gear Reduction Motor
Replies: 98
Views: 15504

Re: Loud Currie Gear Reduction Motor

I have an appointment this morning but if I remember when I get home I'll look up the numbers of the bearings I bought. I have both the inner and outer gearbox bearings. While I have 5 450w Currie motors they are from 3 different manufactures. But the bears were the same in all of them. Note; a fail...
by dumbass
Oct 05 2014 7:09pm
Forum: E-Bike Non-hub Motor Drives
Topic: Loud Currie Gear Reduction Motor
Replies: 98
Views: 15504

Re: Loud Currie Gear Reduction Motor

I believe I have the clanking noise in both my motors diagnosed. I had noticed, when one of them was apart, that the shaft with the big gear on it let the gear move a *lot* from side to side (or up/down when on the bench). I just discovered that when I treat the bike like it has a failing freewheel...
by dumbass
Sep 17 2014 8:22am
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

Here's the data sheet for the P75NF75: http://www.st.com/web/en/resource/technical/document/datasheet/CD00002771.pdf 75 volts, 80 amps, 11 mOhm. There are much better choices out there these days. IPP034NE7N3 is one, 75V, 100A, 3.4mOhm and relatively cheap ($3.41ea on DigiKey). for a little more mo...
by dumbass
Sep 17 2014 8:15am
Forum: E-Bike Non-hub Motor Drives
Topic: New Bafang Crank-Drives
Replies: 4435
Views: 725019

Re: New Bafang Crank-drives

query for kepler if he's around or anyone in Oz who has bought from EM3ev. My order from Paul will come to around $1200 AUD. Now, any goods imported that cost over $1000 is subject to GST and import duties in Australia. Has anyone here had any experience of this in ordering gear?? Realised this and...
by dumbass
Sep 16 2014 4:49pm
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

I assume most or everyone is buying the P75NF75 FETs on EBay. As many including me have asked "is there a better quality that can be used?". I assume the number " P75NF75" is a general number that is used by all MOSFET manufactures use. If this is correct maybe is just the quality of the EBay seller...
by dumbass
Sep 16 2014 11:47am
Forum: E-Bike Non-hub Motor Drives
Topic: New Bafang Crank-Drives
Replies: 4435
Views: 725019

Re: New Bafang Crank-drives

The motor/controller hardly seem to get warm. You can certainly hold your hand on it. Excellent! That's really the result i am aiming for. kepler, thanks for the link to the CA3 thread. Having read through it, I suspect i will stay stock for a while and see how things go. Will be a while before i a...
by dumbass
Sep 16 2014 9:00am
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

A fuse of the right rating might work, but I've generally found the FET will blow faster than the fuse, so the fuse only prevents it from burning after it blows. It definitely sounds like some kind of design issue causing the problem. It may be difficult to tell exactly what without some fancy test...
by dumbass
Sep 16 2014 8:45am
Forum: E-Bike Non-hub Motor Drives
Topic: New Bafang Crank-Drives
Replies: 4435
Views: 725019

Re: New Bafang Crank-drives

astmacca, I have the 48v 500w kit on my old EZip steel frame and it has run great but I've only got about 160 miles on it. I am guessing it is tuned down a bit as well because the max I've ever seen it draw is about 825w to 850 (about 16.5a) and that's with a 48v 20ah pack. I've checked it many time...
by dumbass
Sep 15 2014 1:16pm
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

First off please forgive my electrical stupidity when I ask this question. If it's always the same FET (or even more then one) that blows would there be a way to creat a protection for the FET like a quick blow fuse, fuse link wire or even a breaker? Something that could be accessed from outside the...
by dumbass
Sep 12 2014 9:10pm
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

Nice repair job! If the FETs blow, I'd suggest replacing all of them with better ones. It sounds like the underlying issue is the software allows destructively high currents under some conditions. Using FETs with a lower Ron will reduce the heating somewhat. There are some pretty good choices out t...
by dumbass
Sep 12 2014 9:04pm
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

ac246 wrote:The one I have fixed is a 9 fet controller.
Stand corrected. But I think most are the older 6 models. Did you or seller alter the factor setting before it blew? Just wondering.

Bob
by dumbass
Sep 12 2014 3:52pm
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

Are these new 9FET controllers that are failing? I've got an old 6FET controller and bought the drive with the intent on running an external controller to remove a heat source from near the motor and increase the total thermal dissipation capacity of the drive ( therefore, i can either take increas...
by dumbass
Sep 12 2014 2:38pm
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

If there is anyone that has their dead 25a controller after being replaced under warranty I'd love to get my hands on the dead one. Why? Because the dead one I have is only a 20a controller. So if I'm going to rip into a controller anyway why not try to upgrade mine a little from 20a to 25a? The cos...
by dumbass
Sep 10 2014 6:47pm
Forum: E-Bike Non-hub Motor Drives
Topic: New Bafang Crank-Drives
Replies: 4435
Views: 725019

Re: New Bafang Crank-drives PEDAL RPM?

My understanding is that each electric motor system has some RPM that is optimum for maximum efficiency (range). Can anyone tell me what that would be in PEDAL RPM for the Barfang drives? And is it different for different Wattage/Voltage models? Thanks! Yes for the most part your correct. I used to...
by dumbass
Sep 10 2014 8:48am
Forum: E-Bike Technical
Topic: Possible to bulk charge in parallel with individual chargrs?
Replies: 25
Views: 1892

Re: Possible to bulk charge in parallel with individual char

http://www.szsmartec.com/EN/productsview.asp?PID=752 Sounds like they are working well Bob 8), 1.7A is a decent bleed current too. Are you leaving them permanently connected? They probably specify 18AWG for volt drop purposes, big for 1.7A, as the difference between fully charged and over charge vo...
by dumbass
Sep 09 2014 6:05pm
Forum: E-Bike Non-hub Motor Drives
Topic: New Bafang Crank-Drives
Replies: 4435
Views: 725019

Re: New Bafang Crank-drives

tahustvedt wrote:Anyone know how to splice wires in to control a headlight via the BBS display? According to the manual, pressing and holding "+" will activate the backlight and headlight (if installed). :roll:
I thought that was only an option (if equipped).

Bob
by dumbass
Sep 09 2014 11:25am
Forum: E-Bike Technical
Topic: Possible to bulk charge in parallel with individual chargrs?
Replies: 25
Views: 1892

Re: Possible to bulk charge in parallel with individual char

A quick update on the individual bleeders I bought (and finally received!). I did a very crude quick test on them this morning. First off let me explain they are actually built as a (2 pack). Meaning the board contains 2 individual units sitting side by side. Each having a pos + and a neg - . Convie...
by dumbass
Sep 09 2014 10:10am
Forum: E-Bike Non-hub Motor Drives
Topic: New Bafang Crank-Drives
Replies: 4435
Views: 725019

Re: New Bafang Crank-drives

Oh what a difference a charged battery makes! My first commute into work was an absolute disaster thanks to my very embarrassing charging mistake, but a few hours with a proper charge made all the difference in the world! I scaled some significant hills at over 10% on level 1 assist and the BBS02 d...
by dumbass
Sep 07 2014 9:12am
Forum: E-Bike Non-hub Motor Drives
Topic: New Bafang Crank-Drives
Replies: 4435
Views: 725019

Re: New Bafang Crank-drives

Here's a question I've been wondering about. ac246 wrote a thread called "BBS02 750 Controller Dead" He explains in the thread that he was only able to ride a short distance when the motor stopped functioning. But he heard a slight click when applying the throttle. As so many of us have reported th...
by dumbass
Sep 06 2014 3:16pm
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

Really appreciate this ac246. I've now had 2 controllers blow on me, both within the first 10 miles. The replacement one from EM3EV just blew a hour ago after 4 miles. I also think that my throttle is faulty - this seems to be a common issue. The bike was running fine in PAS mode so I didn't both t...
by dumbass
Sep 06 2014 11:00am
Forum: E-Bike Non-hub Motor Drives
Topic: New Bafang Crank-Drives
Replies: 4435
Views: 725019

Re: New Bafang Crank-drives

Here's a question I've been wondering about. ac246 wrote a thread called "BBS02 750 Controller Dead" He explains in the thread that he was only able to ride a short distance when the motor stopped functioning. But he heard a slight click when applying the throttle. As so many of us have reported thi...
by dumbass
Sep 05 2014 10:09pm
Forum: E-Bike Technical
Topic: BBS02 750W controller dead
Replies: 75
Views: 10107

Re: BBS02 750W controller dead

Great job and fantastic news for many of us. I too have the same problem but my bad kit was a freebie and I was just waiting for someone with more electronic knowledge to figure it out. Now I'll look into repairing my bad controller. Thanks for the fix.


Bob