Search found 13567 matches

by John in CR
Aug 19 2019 11:47am
Forum: E-Bike Technical
Topic: Oil cooling your hub- NOT snake oil!
Replies: 606
Views: 105498

Re: Oil cooling your hub- NOT snake oil!

At those power levels it's probably just getting warm not hot. For some extra cooling add an air deflector on each side to direct more airflow toward the side covers. Less than 5$ of oil 3$ of silicon caulk and my friend's drill would still be cheaper and more effective. :lol: Owning an EV that dri...
by John in CR
Aug 18 2019 2:54pm
Forum: E-Bike Technical
Topic: Oil cooling your hub- NOT snake oil!
Replies: 606
Views: 105498

Re: Oil cooling your hub- NOT snake oil!

At those power levels it's probably just getting warm not hot. For some extra cooling add an air deflector on each side to direct more airflow toward the side covers.
by John in CR
Aug 17 2019 4:58pm
Forum: E-Bike Technical
Topic: Regenerative braking + fully charged battery
Replies: 12
Views: 284

Re: Regenerative braking + fully charged battery

Yes exactly my concern. Heavy loads and long descents demand as much attention be paid to stopping & drag braking as propulsion, with mission-critical reliability required, including redundancy. I am hoping collective wisdom here can reduce the trial and error aspect. I'd look at Nucular controller...
by John in CR
Aug 17 2019 4:53pm
Forum: E-Bike Technical
Topic: Question -n Using ebike pack to top up 12V trolling battery (AGM) via MPPT solar charge controller.
Replies: 4
Views: 73

Re: Question -n Using ebike pack to top up 12V trolling battery (AGM) via MPPT solar charge controller.

I do have a bunch of old Headways that I could reconfigure for 12V pack as a winter project, but then I need a 12V BMS and a new charger, also a reasonable proposition. Or I could just buy a big lithium 12V LiFP04 (100amp hours) made for this purpose I suppose. A 4s pack like that needs no BMS. You...
by John in CR
Aug 17 2019 4:45pm
Forum: E-Bike Technical
Topic: Oil cooling your hub- NOT snake oil!
Replies: 606
Views: 105498

Re: Oil cooling your hub- NOT snake oil!

...high RPM where the cooling will be most necessary. Extra cooling is most needed at low rpm with high load, which equates to high torque needs (high current) and low power output (power = torque X rpm), so it is low efficiency (lots of heat). At high rpm the motor runs lower current and has bette...
by John in CR
Aug 16 2019 11:18pm
Forum: E-Bike Technical
Topic: Oil cooling your hub- NOT snake oil!
Replies: 606
Views: 105498

Re: Oil cooling your hub- NOT snake oil!

If you can seal the motor cover well and use just enough oil fill the magnet gap when it’s running it might work out ok. With a direct drive motor you don’t need to use too much oil. It will spread out when the motor runs sort of like ferrofluid. What I'm really interested in is the liquid fill of ...
by John in CR
Aug 16 2019 11:06pm
Forum: E-Bike Technical
Topic: Regenerative braking + fully charged battery
Replies: 12
Views: 284

Re: Regenerative braking + fully charged battery

Be sure to know the capabilities of the controller regarding regen. Some have "plug braking" in combination with regen, where electric braking will continue at low rpm and/or max charge voltage is reached. These along with controllers where regen works down to zero have issues with heat dissipation....
by John in CR
Aug 16 2019 10:40pm
Forum: E-Bike Technical
Topic: Question -n Using ebike pack to top up 12V trolling battery (AGM) via MPPT solar charge controller.
Replies: 4
Views: 73

Re: Question -n Using ebike pack to top up 12V trolling battery (AGM) via MPPT solar charge controller.

Sounds like a bad idea to me. First, isn't the 100V solar charge controller meant to charge a higher voltage bank of lead acid than a single 12V battery? Second, the voltage of the lithium pack doesn't seem like a good match. Third, what limits the current, since the ebike pack can deliver enough cu...
by John in CR
Aug 11 2019 6:29pm
Forum: E-Bike Technical
Topic: Carbon fiber cranks: made sense in ebikes?
Replies: 6
Views: 242

Re: Carbon fiber cranks: made sense in ebikes?

A trip to the bathroom makes more difference, except the effect on your wallet.
by John in CR
Aug 09 2019 9:56am
Forum: E-Bike General Discussion
Topic: Help me develop the perfect throttle
Replies: 63
Views: 1233

Re: Help me develop the perfect throttle

Waterproof Durable (metal not plastic) Tube only so can install own grips Long turn (or adjustable turn length if possible) Adjustable min and max voltage output (to tune to match controller) Adjustable shape of throttle curve (or just make slope shallower for first 10-20% of response Slightly stron...
by John in CR
Aug 07 2019 6:01pm
Forum: E-Bike General Discussion
Topic: Maximum normal regen? Is CA V3 correct?
Replies: 17
Views: 279

Re: Maximum normal regen? Is CA V3 correct?

I've seen as high as 25% regen on flat terrain. That's with lots of stop-n-go, no pedaling and ebraking as much as possible. 22% regen in the city with lots of pedaling seems quite reasonable to me in city riding where cruising at a constant speed is almost non-existent.
by John in CR
Aug 07 2019 5:44pm
Forum: E-Bike General Discussion
Topic: what kind of electric bicycles do you like?
Replies: 27
Views: 772

Re: what kind of electric bicycles do you like?

I like the kind none of the big companies are building. :bigthumb: I like the one that my blood, sweat, and tears went into, with the goal of making a machine that has no parallel, and is perfect in my eyes. You can't sell me one of those. +1 Nothing beats the satisfaction of using something you bu...
by John in CR
Aug 07 2019 5:38pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 201
Views: 4437

Re: Hub motor industry dying?

$1000 isn't terrible considering what people have paid for low quality Craplyte motors over the years. Regarding QS I haven't heard about quality issues unlike so many others with their broken axles and unglued magnets, but QS run heavier, which really only matters off-road, on bad roads, or if you ...
by John in CR
Aug 07 2019 2:41pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 201
Views: 4437

Re: Hub motor industry dying?

The small DD hub motors I've looked at are really inefficient. Like 60-74%. I don't know if that is due to manufactures not caring or it is something intrinsic to the design... It's just a matter of going for as cheap as possible. They have too thick and low quality steel in the stator lams, and sp...
by John in CR
Aug 07 2019 9:07am
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 201
Views: 4437

Re: Hub motor industry dying?

Yes adding motor is better than adding multiple gears but a single-ratio reduction tends to make sense for the highest power to weight motors that spin very fast. You were just talking about multiple speed reductions right? Just multi-speed. Decreasing motor size for the same power requires higher ...
by John in CR
Aug 06 2019 9:27am
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 201
Views: 4437

Re: Hub motor industry dying?

DDs of today barely pass the 90% efficiency mark but IMHO we haven't seen a mid drive that can even peak at 90% yet - maybe some of the astro mid drives do? ( $$$$ ) Astro can do that driving a propeller but on a ebike the reduction eats that up to the point where you're back at a good hub motor. J...
by John in CR
Aug 06 2019 8:45am
Forum: E-Bike Technical
Topic: Known to Work Brushless Motor/Controller Wiring Diagrams
Replies: 140
Views: 54371

Re: Known to Work Brushless Motor/Controller Wiring Diagrams

I've read thru all the diagrams people have posted.& can't seem to find the diagram Im after. anyone running a q.s v3 motor with crystalytes 72v 60amp controller.. thanks in advance. So much time wasted on something I'd never trust anyway. With a few alligator clip jumper wires it's so easy to be c...
by John in CR
Aug 05 2019 3:29pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 201
Views: 4437

Re: Hub motor industry dying?

What if we not only kept the gears, we added more, but pulled them out of the motor body as a separate transmission component? Arguably the reason for DD weight and inefficiency and geared hub fragility is that they have to operate at suboptimal speeds, and hence the attraction of crank drives. A l...
by John in CR
Aug 05 2019 8:51am
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 201
Views: 4437

Re: Hub motor industry dying?

This is mostly been about over-price toys vs economical basic transportation. I do however take exception with with the preponderance of geared hubbies that have come to dominate the ebike market, because they can never be nearly as durable as a direct drive motor. If a western company wants to be i...
by John in CR
Aug 05 2019 8:35am
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 201
Views: 4437

Re: Hub motor industry dying?

spinningmagnets wrote:
Aug 04 2019 7:10pm
I have three cars...
We have to help you cure that illness.
by John in CR
Aug 04 2019 3:28pm
Forum: E-Bike Technical
Topic: How bad is motor groaning?
Replies: 2
Views: 136

Re: How bad is motor groaning?

Other than being an irritating sound, there's no issue at all. It's just the controller being unsure rotor position due to rpm being still too low, so it fires a few out of sequence pulses causing sound in the motor. A slightly slower turn of the throttle during the first revolution of the tire can ...
by John in CR
Aug 04 2019 3:11pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 201
Views: 4437

Re: Hub motor industry dying?

With the demise of BionX and now GoSwiss, is the hub motor industry dying. Are mid-drives the way of the future? I have two BionX systems purchased six months before they went out of business. Batteries and other parts are becoming very scarce. I do enjoy DIY projects, I also like the security of h...
by John in CR
Aug 03 2019 7:21am
Forum: E-Bike General Discussion
Topic: How to know the range of my bike?
Replies: 26
Views: 657

Re: How to know the range of my bike?

MadRhino is spot on. That motor needs a lot more battery or you're just carrying a bunch of motor weight for nothing. Your battery can't deliver enough current and with only 12ah you couldn't have fun for long even if it could. You also need a much higher power controller. As far as estimating range...
by John in CR
Aug 03 2019 7:08am
Forum: E-Bike General Discussion
Topic: FIRST DIY Build - Seeking advice please! - zero experience building
Replies: 5
Views: 314

Re: FIRST DIY Build - Seeking advice please! - zero experience building

How much do you weigh and do you plan to pedal along (though pedaling at 30mph and up is of questionable help)? I ask because the all up load and whether or not it's motor only during acceleration have a drastic affect of the system requirements in city riding. At least you don't have hills to speak...
by John in CR
Aug 02 2019 12:07am
Forum: E-Bike Technical
Topic: Some help please
Replies: 7
Views: 199

Re: Some help please

amberwolf wrote:
Aug 01 2019 1:13am
Swap any two of the three thick wires going to the motor--it's probably a geared hubmotor and running backwards. ;)
+1

Another simple answer may be that the controller has an ignition wire to turn the controller on, which needs to connect to battery positive.