Search found 2006 matches

by Russell
Oct 09 2016 4:01am
Forum: Items for Sale - New
Topic: 26" Q100 motor and kit pieces
Replies: 1
Views: 383

Re: 26" Q100 motor and kit pieces

Silver or Black?
201 RPM? (at 36V)
7-speed freewheel?
Freewheel range? (i.e. 14-28)
Thumb or twist throttle?
Laced to rim?
by Russell
Oct 11 2015 5:17pm
Forum: E-Bike General Discussion
Topic: Copenhagen wheel
Replies: 229
Views: 31803

Re: Copenhagen wheel

Recent review; http://electricbikereview.com/superpedestrian/copenhagen-wheel/ That review is a year old, and the Copenhagen wheel still has not shipped. They've been holding onto buyers' money for nearly two years now... Apparently you didn't even bother to start the video since he clearly says "i...
by Russell
Sep 09 2015 6:35am
Forum: E-Bike General Discussion
Topic: Q100 and Q128 with 0.35mm laminations
Replies: 254
Views: 28577

Re: Q100 and Q128 with 0.35mm laminations

Very bad idea. The off-set in the rim is already on the limit of geting decent spoke tension on the cassette side. I don't think you'd be able to build the wheel like that because with maximum spoke tension, it still wouldn't pull the rim across far enough. This is a problem with most geared casset...
by Russell
Sep 09 2015 2:56am
Forum: E-Bike General Discussion
Topic: Q100 and Q128 with 0.35mm laminations
Replies: 254
Views: 28577

Re: Q100 and Q128 with 0.35mm laminations

Though I prefer a front motor a 260 RPM rear Q100H cassette version with a 132.5mm OLD would also work on the bike I have in mind.



-R
by Russell
Aug 26 2015 5:49pm
Forum: E-Bike General Discussion
Topic: Q100 and Q128 with 0.35mm laminations
Replies: 254
Views: 28577

Re: Q100 and Q128 with 0.35mm laminations

Who remembers this famous movie quote? Mongol General: Hao! Dai ye! We won again! This is good, but what is best in life? Mongol: The open steppe, fleet horse, falcons at your wrist, and the wind in your hair. Mongol General: Wrong! Conan! What is best in life? Conan: Crush your enemies. See them dr...
by Russell
Aug 25 2015 10:47pm
Forum: E-Bike General Discussion
Topic: NewB, Bagang 750 best option for me?
Replies: 6
Views: 433

Re: NewB, Bagang 750 best option for me?

There's a thread dedicated to them;

https://endless-sphere.com/forums/viewt ... 28&t=50104

Start reading...there's 174 pages! :o

-R
by Russell
Aug 24 2015 2:29am
Forum: E-Bike General Discussion
Topic: Q100 and Q128 with 0.35mm laminations
Replies: 254
Views: 28577

Re: Q100 and Q128 with 0.35mm laminations

340 RPM (at 36V) is pretty darn fast for a small geared motor in a large rim. That's 43km/h at 36v, or 57km/h at 48v, unloaded. That's not that fast, is it? Yes for most applications a Q100 running at 9.4 RPM/V is too fast for a 26 or 700C wheel. The 9.0 RPM/V MXUS and GM mini's I used with 700C wh...
by Russell
Aug 23 2015 11:26pm
Forum: E-Bike General Discussion
Topic: Q100 and Q128 with 0.35mm laminations
Replies: 254
Views: 28577

Re: Q100 and Q128 with 0.35mm laminations

My plan is to offer high efficiency/output Q100 and Q128 motors in rear drive form. Right now the possibilities are: 1) 340RPM Q100H 0.35mm freewheel version (currently on my carbon bike) If we can meet minimum order quantities, I'd like to offer: 2) 340 RPM Q128 CST 0.2mm 3) 340 RPM Q100H / Q100 C...
by Russell
Aug 20 2015 7:54pm
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3614

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

...The other way is to use an accurate wattmeter so you can keep tabs on the battery and turn for home before it gets too low. I would even suggest purposely riding until the pack is fully drained one time so you can get the capacity data for it. That will give you confidence on subsequent rides. -...
by Russell
Aug 18 2015 11:59am
Forum: Motor Technology
Topic: Best 48V 250W hub motor for hot rodding?
Replies: 7
Views: 2915

Re: Best 48V 250W hub motor for hot rodding?

so I won't do wrong if I go with this one- http://www.elifebike.com/peng/iview.asp?KeyID=dtpic-2012-8A-RK1S.8TKFU I would like it to be fairly lightweight too - maximum 3 kilos. And - do you I just order a controller for 48V 750W motor and run it with it and that's gonna do the trick? Thank you! Th...
by Russell
Aug 17 2015 10:04pm
Forum: E-Bike Technical
Topic: OK...noob q...where's the power go during hard coasting?
Replies: 36
Views: 3336

Re: OK...noob q...where's the power go during hard coasting?

My bikes are too fast now, but back when I had a 30mph bike I don't remember noticing any significant drag when coasting well above no load speed, and I also never noticed any voltage increase like I regularly see with regen braking. As I've been saying it has to be a slow bike. A "30mph bike" is l...
by Russell
Aug 17 2015 3:30pm
Forum: Motor Technology
Topic: Brushed controller as dc-dc converter?
Replies: 11
Views: 645

Re: Brushed controller as dc-dc converter?

I don't recommend doing this. In theory if you supply the electrical loads of the car with the E-bike battery the alternator load on the engine would be minimal. If the 60V battery output is regulated at around 14V then the alternator should not have much to do and won't load the engine...but what a...
by Russell
Aug 17 2015 2:27pm
Forum: Motor Technology
Topic: Best 48V 250W hub motor for hot rodding?
Replies: 7
Views: 2915

Re: Best 48V 250W hub motor for hot rodding?

Hi, so I am considering buying a street legal hub motor for my 48V 15Ah battery (capable of 100A maximum output). Which hub motors are best for "hot rodding" - would I be able to run some as high as at 750Watt and still maintain the appearance of a legal 250W motor? Thank you! David. I would not co...
by Russell
Aug 17 2015 1:58pm
Forum: Motor Technology
Topic: Brushed controller as dc-dc converter?
Replies: 11
Views: 645

Re: Brushed controller as dc-dc converter?

It's to improve mpg on my car. Reduce alternator load by keeping the battery full. Current spikes are not an issue at 20amps. The ebike battery is worthless so I am trying to find a use for it. Or for when I take my ebike on a road trip. Even if the battery is fully charged the alternator does stil...
by Russell
Aug 17 2015 1:05pm
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3614

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

I can't access the picture. That difference between Vrest and Vmin is of course not correct. My logs indicate an internal resistance of 0.184 ohms for a voltage sag of 0.184V per Amp or just over 4.0V at 22A peak load. This relationship holds until almost 90% capacity has been used. There are quite...
by Russell
Aug 17 2015 12:05am
Forum: Motor Technology
Topic: Brushed controller as dc-dc converter?
Replies: 11
Views: 645

Re: Brushed controller as dc-dc converter?

Why not just get a dc converter? The cheap ones don't allow fine tuning the output voltage from what I've seen. And brush controllers are cheap. I don't know about using a brushed controller but two winters ago I used my E-bike battery with a DC-DC converter to keep my car battery charged during an...
by Russell
Aug 16 2015 4:10pm
Forum: E-Bike Technical
Topic: OK...noob q...where's the power go during hard coasting?
Replies: 36
Views: 3336

Re: OK...noob q...where's the power go during hard coasting?

Except that the "bridge" is closed, because as Drunkskunk pointed out the switches are turned off. As I have mentioned a couple of times already you can easily verify the presence of the "regen" voltage yourself experimentally with a voltmeter or inline wattmeter and a spin of the wheel. To actuall...
by Russell
Aug 16 2015 12:46pm
Forum: E-Bike Technical
Topic: OK...noob q...where's the power go during hard coasting?
Replies: 36
Views: 3336

Re: OK...noob q...where's the power go during hard coasting?

Except that the "bridge" is closed, because as Drunkskunk pointed out the switches are turned off. As I have mentioned a couple of times already you can easily verify the presence of the "regen" voltage yourself experimentally with a voltmeter or inline wattmeter and a spin of the wheel. To actuall...
by Russell
Aug 15 2015 10:10pm
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3614

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

I'm using one of these https://drive.google.com/open?id=0B7ym9WvyF_P7ZTVpRG9uNE5SMWs It's wierd but the Vmin was only 0.5v below Vrest at the end of the ride. Maybe I viewed it wrong, will try again tomorrow. Really appreciate your other advice just now. The 48v is a bit of a revelation on hills. A...
by Russell
Aug 15 2015 8:56pm
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3614

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

My 11.6Ah downtube battery (w/Samsung 29E cells) performs better than I expected. The most I ever drained it was 10.9 Ah/497 Wh using a 15A controller. The minimum voltage was 37.85V with a resting voltage of 43.04V at the end of the ride. The Battery's BMS never did trip even though the pack was cl...
by Russell
Aug 15 2015 4:05pm
Forum: E-Bike Technical
Topic: OK...noob q...where's the power go during hard coasting?
Replies: 36
Views: 3336

Re: OK...noob q...where's the power go during hard coasting?

This notion of energy going back to the battery if coasting speed exceeds no-load speed sounds like hogwash to me. I would have seen it show up on the CA the same as regen current, but I never have seen it. It's not hogwash at all. The motor can also be a generator. As I said just spin it with a vo...
by Russell
Aug 15 2015 12:55pm
Forum: E-Bike Technical
Topic: OK...noob q...where's the power go during hard coasting?
Replies: 36
Views: 3336

Re: OK...noob q...where's the power go during hard coasting?

In reality, there is some leakage on the FETs, so you get a slightly closed circuit. This is what we call "Cogging." You can feel it on some motors when you try to pedal without power. A 9C 2807 for example, will generate 23 watts at 20mph. All of that power is lost as heat. Not all is lost to heat...
by Russell
Aug 15 2015 12:41pm
Forum: E-Bike Technical
Topic: Phase and hall connection with throttle problem
Replies: 11
Views: 746

Re: Phase and hall connection with throttle problem

http://www.aliexpress.com/item/Black-36V-1200W-Brushless-DC-Sine-Wave-Controller-48V-1500W-ebike-controller-Regenerative-Function/32333156665.html?tracelog=ae-app-ios-sharefor-shkmail This is happening under no load at all motor is hooked up to controller only That controller looks a lot like the S...
by Russell
Aug 15 2015 10:47am
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3614

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

The late model KU93 (the one with the 4-pin LED plug) is dual-voltage 36V/48V. The only problem you would run into is if you use the 810 display which is calibrated for either 36 or 48V. I don't use the display with mine so there was no problem going back and forth between my 36 and 48V batteries. Y...