Search found 14381 matches

by John in CR
Oct 01 2020 12:19pm
Forum: E-Bike Technical
Topic: Do cooler motors run quicker?
Replies: 14
Views: 353

Re: Do cooler motors run quicker?

Cooler runs a bit faster and less efficiently. Here's a graph of a nice cool motor vs a hot one.
Cool vs hot motor.JPG
Cool vs hot motor.JPG (156.28 KiB) Viewed 11 times
by John in CR
Oct 01 2020 2:55am
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

What could be more of a fair, equal comparison than the same controller, same battery, and same motor with the only difference being winding? It's wrong because a controller appropriate for a slow wind motor isn't appropriate for a fast wind motor and vice versa, It’s the one that comes with the mo...
by John in CR
Oct 01 2020 1:01am
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

What could be more of a fair, equal comparison than the same controller, same battery, and same motor with the only difference being winding? Will you answer this simple question, please? It's wrong because a controller appropriate for a slow wind motor isn't appropriate for a fast wind motor and v...
by John in CR
Sep 30 2020 11:02pm
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

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 John in CR
Sep 30 2020 2:47am
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

Which failures you've been telling us are because of slow winds, because of their higher resistance. Almost every burned up motor on the forum. This resistance problem was apparently unknown to the people who set up the motor simulator profiles, because it doesn't show up there? Like I said early, ...
by John in CR
Sep 30 2020 1:13am
Forum: Alternative Energy
Topic: Don't we all wish we had this on our property
Replies: 10
Views: 794

Re: Don't we all wish we had this on our property

It's been a while since I did the research to confirm his estimate of 6kw continuous as a fairly conservative estimate, but it was more than enough to offset the $1k/mo electric bill for his dairy farm. Note that our 98% green electricity is nationalized, and despite being primarily hydro power, ou...
by John in CR
Sep 29 2020 11:19pm
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

Given a 26" rear wheel, doesn't it make sense, to use a slow wind on it? No, winding doesn't matter. If you're only coming close on the sims, then you're still not quite apples and apples. The real world differences are minuscule and related to things like tiny differences in end turn losses. What ...
by John in CR
Sep 29 2020 10:42pm
Forum: Alternative Energy
Topic: Don't we all wish we had this on our property
Replies: 10
Views: 794

Re: Don't we all wish we had this on our property

A new friend who want my help building a high powered ebike is also working on a hydroelectric project on his dairy farm that has an electric bill of over $1000/mo. It's up in the mountains at 4,000m of elevation and he has a small river with year-round flow and a whopping 200m of head :shock: . Ev...
by John in CR
Sep 29 2020 12:48pm
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

Guys, you are wasting everyone's time by using apples and oranges comparisons to support your erroneous conclusions, No, that's what you're doing when you prescribe a different controller and battery for every different application, along with wheel sizes no normal adult bike was designed to use. P...
by John in CR
Sep 29 2020 12:42pm
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

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't kno...
by John in CR
Sep 29 2020 12:23pm
Forum: E-Bike Technical
Topic: FEM Dropout analysis - max force ?
Replies: 18
Views: 374

Re: FEM Dropout analysis - max force ?

- So just adding a small clamping bolt increases torque handling from 35Nm to 60Nm - nearly double. "Nearly double" is not anywhere close to the real world benefit. There is never precision machining of the dropouts to the axle size, and a press fit would be impractical anyway, so there is always p...
by John in CR
Sep 29 2020 6:46am
Forum: E-Bike Technical
Topic: FEM Dropout analysis - max force ?
Replies: 18
Views: 374

Re: FEM Dropout analysis - max force ?

Newton meters in the dropout is crazy newtons of force at the small radius, so yes it's thousands of newtons of force in those dropouts.
by John in CR
Sep 29 2020 6:34am
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

[apples and oranges comparisons not worthy of quoting] [apples and oranges comparisons not worthy of quoting] Guys, you are wasting everyone's time by using apples and oranges comparisons to support your erroneous conclusions, and it is a disservice to the membership of the forum to propagate misle...
by John in CR
Sep 28 2020 6:50pm
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

Others have different speed objectives, but it's always beneficial to get the right kV for the job, rather than one that's faster. Yeah, it's beneficial - a long as you don't get too "wound up" over a couple percentage points that aren't going to make the kind of difference that anyone would notice...
by John in CR
Sep 28 2020 10:56am
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

It's not just hotrodders who burn up their hubbies. It's regular people just trying to get up a hill too, and the hill doesn't have to be that steep either. They just combined the wrong conditions with a wheel size that caused heat and less range from the start. You mean folks who use too fast a wi...
by John in CR
Sep 28 2020 3:30am
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

The motor can be ordered with an inexpensive controller, which is spec'ed for the motor. It also comes with your choice of winding at no charge. Why would any sane, not obsessed person choose to go on an exotic controller and battery quest rather than just choose the right winding for the job (purp...
by John in CR
Sep 28 2020 1:36am
Forum: E-Bike General Discussion
Topic: Temporary replacement controller
Replies: 3
Views: 122

Re: Temporary replacement controller

As long as you can get either with irfb4110 mosfets, I've had good luck with with both Greentime's 18fet controller and YYK YuYangKing's 18fet with the advantage going to the YYK due to android phone programmability (maybe they have an iPhone app now, but no idea since I'd never own an i-anything.) ...
by John in CR
Sep 28 2020 1:11am
Forum: E-Bike General Discussion
Topic: Sur Ron vs. DIY hub motor bike?? Which would you recommend?
Replies: 3
Views: 158

Re: Sur Ron vs. DIY hub motor bike?? Which would you recommend?

Have you ridden one? They seem too small for anyone above average size. Plus I'm too spoiled by silent hubmotors to put up with the sound of a high rpm motor unless high rpm is only at high speed...ie no small drive sprockets or pulleys for me. You'll learn more, can build something better (though l...
by John in CR
Sep 28 2020 12:59am
Forum: E-Bike General Discussion
Topic: Hall sensor repair..quick question
Replies: 11
Views: 246

Re: Hall sensor repair..quick question

Did you test to be sure that it's not a hall wire problem instead of the sensor? In 12 years of ebiking with many bikes I've never had a hall failure. In the early years I did heat a motor up enough to melt the halls wires up enough where they go thru the axle to melt the insulation a bit making it...
by John in CR
Sep 27 2020 5:20pm
Forum: E-Bike General Discussion
Topic: Hall sensor repair..quick question
Replies: 11
Views: 246

Re: Hall sensor repair..quick question

Did you test to be sure that it's not a hall wire problem instead of the sensor? In 12 years of ebiking with many bikes I've never had a hall failure. In the early years I did heat a motor up enough to melt the halls wires up enough where they go thru the axle to melt the insulation a bit making it ...
by John in CR
Sep 27 2020 11:58am
Forum: E-Bike Technical
Topic: Is regenerative braking really worth anything?
Replies: 104
Views: 2344

Re: Is regenerative braking really worth anything?

But cranks mounted on square tapers don't "budge", and neither do pedals that have been tightened upon mounting. But both can move enough under reversing torque to back the fasteners off, and then everything goes sideways. The remedy, if you must use fixed gearing, is to check and tighten these thi...
by John in CR
Sep 27 2020 3:16am
Forum: E-Bike Technical
Topic: Is regenerative braking really worth anything?
Replies: 104
Views: 2344

Re: Is regenerative braking really worth anything?

But when you spin the axle and it costs more to fix it than to get another motor, that feels not so good. Reversing torque does that to pedals, to cranks, and to the axle nuts of hub motors. Using a freewheel rather than a fixed gear prevents it for pedals and cranks, and using forward-only drive p...
by John in CR
Sep 26 2020 8:12pm
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

Hmmmm more torque myth....... AGAIN Two same motors of different wind counts do not have a) more torque or b) more speed, they both have the exact same torque and speed. Playing around with tire diameter, controller voltage and controller amps, gauge and length of battery cables and phase wires you...
by John in CR
Sep 26 2020 7:39pm
Forum: E-Bike Technical
Topic: Is regenerative braking really worth anything?
Replies: 104
Views: 2344

Re: Is regenerative braking really worth anything?

If it tested at 16.5Ah , you should be satisfied right?; meets expectations. How would you feel if it tested 15.3Ah ? How would you feel if it tested at 17.7Ah ? When I say regen is nice, I mean it feels like the latter. Sometimes it's really nice. But when you spin the axle and it costs more to fi...
by John in CR
Sep 26 2020 9:20am
Forum: E-Bike General Discussion
Topic: Leafmotor project
Replies: 55
Views: 937

Re: Leafmotor project

...They're only equal if 1) you drive them both to saturation, and... Wrong as usual. They are the same motor and are in no way the equivalent of changes in gearing. They simply require a different combination of voltage and current for the same result. I take my earlier statement back. You don't r...