Search found 683 matches

by donn
Oct 02 2020 1:18am
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

The last few paragraphs explains the myth well. https://endless-sphere.com/forums/viewtopic.php?f=2&t=64907&p=984783&hilit=motor+torque+myth#p984783 Now replace the controller on the Faster 3540 winding with one that has fatter gauge wire so that it's only 10mOhm of resistance, and you ...
by donn
Oct 01 2020 12:40am
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

There are several motors to choose from with multiple winding options - I've been using 9C+, but I don't care. Whatever standard issue controller and battery Fine, they can be made to equal out with controllers with exotic parameters - 24V x 70A? Since the difference is not all that large with norm...
by donn
Sep 30 2020 2:58pm
Forum: EBike Technical
Topic: match controller with rear hub motor
Replies: 15
Views: 436

Re: match controller with rear hub motor

Isn't there a certain amount of configuration to be done, to put a controller and motor together? I don't know, Hall sensor angle and so forth? Maybe it's all more or less standardized these days. I think especially if I were going to get tangled up with a torque sensor for PAS, I'd want to look int...
by donn
Sep 30 2020 2:17pm
Forum: EBike General Discussion
Topic: Phaserunner acceleration
Replies: 20
Views: 734

Re: Phaserunner acceleration

Then I agree with the big cheap controller route I get the impression he would have done just that and never posted the question in the first place, if he know of a big cheap controller with the small form factor. Does it exist? No one doubts that common inexpensive controllers can deliver more acc...
by donn
Sep 30 2020 11:46am
Forum: EBike General Discussion
Topic: Thinking Outside the Shark Battery
Replies: 20
Views: 823

Re: Thinking Outside the Shark Battery

Clearing both the pedals and the chain might be a problem with mounting it there. Chain likely closer than you may think. I'd bet money it won't go square in the middle, because of the chain, but slightly offset to the left, it might go. It's about the wettest dirtiest spot on the bicycle though, i...
by donn
Sep 30 2020 9:59am
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

...proving that the things I say are true. Maybe that proves it to you. What would prove it to me, would be if I could see it in the motor simulator. You say it's there. Tell us where. There are several motors to choose from with multiple winding options - I've been using 9C+, but I don't care. Wha...
by donn
Sep 30 2020 12:44am
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

You left out stronger off the line, and better range. Sure ... but - not to put too fine a point on it, but I'm not claiming these are really significant advantages in the larger scheme of things. Enough to tip me towards a slower wind, but not enough to make me think I'd be able to tell the differ...
by donn
Sep 30 2020 12:36am
Forum: EBike General Discussion
Topic: Thinking Outside the Shark Battery
Replies: 20
Views: 823

Re: Thinking Outside the Shark Battery

It's going to take some fabrication. Mine is scrap wood and baling wire. First time around I used fluted polypropylene ("coroplast"), which is very strong but not as esthetically pleasing as scrap wood and baling wire. If you go for something more upscale and need a couple of fancy clamps,...
by donn
Sep 30 2020 12:03am
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

It sounds like you still haven't accepted the simple fact that torque and power limits and efficiency of a motor aren't determined by the windings. ... Even before I understood this winding thing, it was forced upon me, because I wasn't suffering failures like the rest of the guys here, despite ste...
by donn
Sep 29 2020 11:52pm
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

My speed limit is set at 46kph. Looking at the chart torque and motor power start dropping off between 20-25mph. This is where my power drops off also due to health. I think the best watts/torque is around 24kph/15mph but I also can peddle hard at 24kph and the wind resistance is very low at that s...
by donn
Sep 29 2020 2:36pm
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

Have been reading a lot on here, playing with motor simulator and listening to Justin. What is sinking in is everyone is staring at efficiency numbers but not watts per km/mi. All motors have a sweet spot, where they make the most torque/watt. Does not matter what voltage, Kv, amps. "John in C...
by donn
Sep 29 2020 1:32pm
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

The EXACT same results (torque, efficiency, etc) he gets with his slow wind motor are easily achieved with a fast wind motor with the right combination of lower voltage and higher current for the same power input. I'd give you "close" - so far, the simulator comparisons I've seen have bee...
by donn
Sep 29 2020 9:53am
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

since slow wind motor versions are more easily pushed into heat failure. We should be able to see this in the simulator, with the right parameters. Various hub motors represented there in multiple windings. When I try it, the slow winds look good on a 26" wheel. That makes sense to me - I don'...
by donn
Sep 28 2020 11:58pm
Forum: EBike General Discussion
Topic: Why are geared motors worse than direct drive for climbing hills?
Replies: 58
Views: 3372

Re: Why are geared motors worse than direct drive for climbing hills?

When I have had uses for scrap metal, it has involved some brazing, and no one likes to put a torch to galvanized.
by donn
Sep 28 2020 9:14pm
Forum: EBike General Discussion
Topic: Why are geared motors worse than direct drive for climbing hills?
Replies: 58
Views: 3372

Re: Why are geared motors worse than direct drive for climbing hills?

If you want free steel, you find some steel bases for temp fences which are usually found near temp fences that have been disarded and just laying around not connected to anything because the owners of the temp fence deemed that steel base defective and littered the ground so you do them a favor by...
by donn
Sep 28 2020 7:29pm
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

Slow wind motors are fine for those who are positive they never go faster, however, they are easier to push to heat failure on long hills because even relatively low power controllers can push enough current through their far higher resistance windings. OK, back to the simulator. Hm, it looks to me...
by donn
Sep 28 2020 3:49pm
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

Like most folks, I live in a city. Zero to 20mph is the range where my bike's performance matters. How it performs at higher speeds is unimportant, because I usually don't go at those speeds. Others have different speed objectives, but it's always beneficial to get the right kV for the job, rather ...
by donn
Sep 28 2020 12:27pm
Forum: EBike General Discussion
Topic: Leafmotor project
Replies: 60
Views: 1459

Re: Leafmotor project

Just looking at the simulator, with a pair of 9C+ motors, 2705 vs 2707, with a 20A controller. Torque is quite different at low RPM. 2505 tops out at 30nm up to 200rpm; 2507 tops out at 41nm up to 100rpm. Once the rpms are over 200, though, torque is roughly the same between the two. Top speed is of...
by donn
Sep 28 2020 10:24am
Forum: EBike General Discussion
Topic: Phaserunner acceleration
Replies: 20
Views: 734

Re: Phaserunner acceleration

I've read some posts where users complain about slow acceleration with the Phaserunner. I went looking for such a post here, and didn't see it. I'm curious what they said about it. I'm no expert on controllers, but I understand the Phaserunner has a "torque" throttle instead of a voltage/...
by donn
Sep 28 2020 9:59am
Forum: EBike Technical
Topic: Is regenerative braking really worth anything?
Replies: 104
Views: 3244

Re: Is regenerative braking really worth anything?

If for whatever reason you don't want to run e-brake and throttle controls through a Cycle Analyst computer, cruise control appears to be fairly common in run of the mill controllers, with the KH6xx infineon circuitry. Since controllers would mostly be Chinaware, it seems you will usually find them ...
by donn
Sep 24 2020 4:38pm
Forum: EBike General Discussion
Topic: a bike for my wife
Replies: 22
Views: 999

Re: a bike for my wife

I don't know anything about the specific models, but it's probably worth mentioning that bicycles have more or less the same fit issues whether they have motors or not. One that offers a more pleasant ride for her size and proportions, might make a bigger difference than battery integrated into the ...
by donn
Sep 21 2020 3:06am
Forum: EBike Technical
Topic: Is regenerative braking really worth anything?
Replies: 104
Views: 3244

Re: Is regenerative braking really worth anything?

I don't believe it because I can't envision a bike ride where I am hitting the brakes enough to recover 17% Suit yourself. I've never seen 17%, so maybe I shouldn't believe it either. Lies! How can he think he will get away with it!? [ for the humor impaired, that was written in jest. ] So, actuall...
by donn
Sep 19 2020 6:52pm
Forum: EBike Technical
Topic: Is regenerative braking really worth anything?
Replies: 104
Views: 3244

Re: Is regenerative braking really worth anything?

I saw some designs on the forum using small rc servo to engage the motor; I’ll rather go along this line, or add lever like for the fork lock. Interesting. I sometimes wonder why this isn't a feature with hub motors. The "have your cake and eat it, too" lever that you could push to turn a...
by donn
Sep 19 2020 3:06am
Forum: EBike General Discussion
Topic: Is DIY dying?
Replies: 40
Views: 1790

Re: Is DIY dying?

that's the Aden sports LH drive you elude to;).. search this forum you will find some video etc.. Yes, indeed, thank you. I'm glad to see they're still at it. One of the interesting characteristics of this design seems to be that you can choose from several ratios, by selecting from different rack ...
by donn
Sep 18 2020 4:19pm
Forum: EBike General Discussion
Topic: Is DIY dying?
Replies: 40
Views: 1790

Re: Is DIY dying?

No, not at all, I just happened across it this morning somewhere else. My DIY angle is that I'd rather ride a recumbent bicycle. Not real interested in PAS, either, for that matter, but I guess that's an anti-DIY aspect of this solution - if you must use their controller, you're stuck with whatever ...