Search found 368 matches

by ferret
Jan 29, 2018 5:14 am
Forum: E-Bike Technical
Topic: battery / phase current ratio unanswered
Replies: 11
Views: 364

Re: battery / phase current ratio unanswered

Hi esust. I'm no electronics expert so this is not an accurate answer. From what I read, the controller and motor windings act like a buck converter (similar to a transformer) which causes the motor to get higher current at a lower voltage. The power (voltage X current) stay the same because of ener...
by ferret
Jan 08, 2018 9:38 am
Forum: E-Bike Non-hub Motor Drives
Topic: Fitting freewheels to splined freehub drivers
Replies: 639
Views: 48978

Re: Fitting freewheels to splined freehub drivers

Thud,
https://www.tartybikes.co.uk/complete_f ... s/c16.html

The shop offers several types of splined freewheels and cranks. The Bonez and Crewkerz brands have Shimano compatible splines while the others (Crewkerz among them) are proprietary patterns.

Avner.
by ferret
Jan 08, 2018 4:01 am
Forum: E-Bike Non-hub Motor Drives
Topic: Fitting freewheels to splined freehub drivers
Replies: 639
Views: 48978

Re: Fitting freewheels to splined freehub drivers

Nice find DanGT86!
This used to be a unicorn and now it's an off the shelf part.

Avner.
by ferret
Jan 02, 2018 4:32 pm
Forum: E-Bike Technical
Topic: Short throw thumb throttle?
Replies: 24
Views: 474

Re: Short throw thumb throttle?

Maybe combine a short "vertical" travel throttle with this product (or DIY somthing similar):

Image

http://www.wolftoothcomponents.com/products/remount

Avner.
by ferret
Jan 02, 2018 12:40 pm
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 716

Re: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency

Really you need to just try that individual motor and see how to does. It might double its useful RPM range only changing from 91% efficiency to 90% efficiency while it's at double speed. It might drop from 90% the 80%, but I've never seen any amount of 'field weakening' achieve a double digit effi...
by ferret
Jan 02, 2018 11:33 am
Forum: E-Bike Technical
Topic: Best Cushiony Rear Shock for Ebike
Replies: 16
Views: 601

Re: Best Cushiony Rear Shock for Ebike

I have the following suggestions: A coil shock will have better small bump sensitivity then an air shock. A shock with more adjustments (high speed compression, low speed compression, high speed rebound and low speed rebound) will potentially be better, but reaching that potential will take more tri...
by ferret
Jan 01, 2018 6:23 am
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 716

Re: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency

It only reaches the penalty of the % at that speed it achieves. So if your max field weakened no-load speed for your motor is 80mph or whatever, but you only have the power to achieve 50mph, you will never be penalized for what it would be doing at 80mph, because it only advances timing as much as ...
by ferret
Dec 30, 2017 4:29 am
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 716

Re: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency

https://endless-sphere.com/forums/viewtopic.php?f=30&t=63467 Thanks for pointing out this thread, I will check it out. For every RC car and ebike and EV I personally would max field weakening settings (this is also what OEMs all do). I would have guessed that at some point too much timing/field wea...
by ferret
Dec 29, 2017 9:22 am
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 716

Re: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency

Thanks, my applications are RC inrunner motors, my Astroflight 3215 (sensored) powered bike and actual RC race cars. On the bike I can either use the Phaserunner's field weakening or increase cell count for more top end power and in the RC cars advance timing, change gearing use a lower wind motor. ...
by ferret
Dec 28, 2017 10:46 am
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 716

Re: Higher top speed question for motor gurus

Dan, thanks for taking the time to write the detailed response. I guess I didn't title the topic correctly, because I'm not getting the type info I'm looking for. Something like a motor simulator that allows you the mess with the motor's timing. I'll try to steer the discussion to motor parameters' ...
by ferret
Dec 28, 2017 9:52 am
Forum: E-Bike Non-hub Motor Drives
Topic: Dave's 80:1 RC mid drive kit build log
Replies: 958
Views: 96704

Re: Dave's 80:1 RC mid drive kit build log

I'm using this type of throttle: https://www.aliexpress.com/item/WUXING-108X-Right-Left-Finger-Thumb-Throttle-Ergonomic-Design-20-22mm-DIA-Handlebar-Electric-Bicycle-Scooter/32836508457.html?spm=a2g0s.9042311.0.0.s9RlY0 Mounted on the left where a front shifter would normally go. Reasonably easy to ...
by ferret
Dec 28, 2017 7:42 am
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 716

Re: Higher top speed question for motor gurus

Thanks for all the responses. The reason I posted this question was to gain deeper understanding of the various methods and the differences between them, not to reach a specific top speed. Field weakening only has any penalty in efficiency while you're at the speed range that uses it. Of-course, but...
by ferret
Dec 27, 2017 7:01 pm
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 716

Discussion: Motor voltage, timing and gearing's effects on performance and efficiency

Hi. Rising a vehicle's performance can be achieved using several different methods: Increasing pack voltage Changing gearing or wheel size Field weakening Advanced timing, static Advanced timing, dynamic (only at high RPM) How do these methods compare to each other in terms of efficiency, torque and...
by ferret
Dec 10, 2017 3:48 am
Forum: E-Bike Technical
Topic: Is this a sine wave controller?
Replies: 5
Views: 433

Re: Is this a sine wave controller?

Girder,
unless a controller is specifically advertised as "Sine Wave", you can be 99.9% certain it is not.

If you describe what controller you are looking for, members will be happy to give recommendations. It will be faster than picking a controller and asking about it.

Avner.
by ferret
Dec 06, 2017 3:41 am
Forum: E-Bike Technical
Topic: need a recommendation for full suspension front fork and rare
Replies: 2
Views: 188

Re: need a recommendation for full suspension front fork and rare

-CrazyBiker- wrote:
Dec 05, 2017 6:27 pm
for a EBB frame, so what do u think? DNM? FOX? etc...

how important Is the coil / air spring?
Generally speaking:
Coil: Heavier, less adjustable, better small bump compliance.
Air: Lighter, more adjustable, less small bump compliance.

Avner.
by ferret
Dec 04, 2017 3:50 am
Forum: E-Bike Non-hub Motor Drives
Topic: Pesu TTium mid drive bike cheap on kickstarter
Replies: 4
Views: 314

Re: Pesu TTium mid drive bike cheap on kickstarter

"PESU - the world’s fastest electric mountain bikes" :lol:

And of-course "TTium" has nothing to do with Titanium.

Avner.
by ferret
Nov 20, 2017 4:26 am
Forum: E-Bike General Discussion
Topic: eRecumbent - clearance problem with calliper
Replies: 3
Views: 146

Re: eRecumbent - clearance problem with calliper

The picture isn't very clear, but it looks like if you remove the 6 disk bolts and flip the brake disk, you will move it a few mm closer to the centerline of the bike and may gain the required clearance.

Avner.
by ferret
Oct 17, 2017 3:43 am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 37
Views: 1558

Re: Using bicycle's frame as heatsink for the Phaserunner

Rubber is excellent for expanding the contact area, but rubber is heat insulator... In fact, every solid which is flexible is heat insulator. The last idea I've had, is to create an intermediate&sealed volume between the body of the Phaserunner and the frame, which would be filled with some sort of...
by ferret
Oct 11, 2017 12:05 pm
Forum: E-Bike Technical
Topic: SRAM IGH vs Derailleur
Replies: 4
Views: 268

Re: SRAM IGH vs Derailleur

Hubert, Although they have the advantages you mentioned, IGHs didn't take off in the MTB world mainly because they are inferior to a derailleur system in these aspects: Heavier. More expansive. In most case have a narrower gear range. Incompatible with modern mountain bikes rear axle standards. From...
by ferret
Oct 11, 2017 7:30 am
Forum: E-Bike Technical
Topic: SRAM IGH vs Derailleur
Replies: 4
Views: 268

Re: SRAM IGH vs Derailleur

1X drivetrains is a trend that has become popular in mountain bikes in the last few years. People want to eliminate the front derailleur to reduce complexity and weight. They are not intended for the same users as IGHs.
by ferret
Oct 06, 2017 5:13 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Astral Rune build thread
Replies: 16
Views: 1345

Re: Astral Rune build thread

As I mentioned, I already tried both frame mounted battery and backpack mounted battery and prefer the latter. Not trying to convince you or anyone, especially not knowing your riding style, I feel that a backpack is better for me for the following reasons: * More nimble handling. * Less impacts to ...
by ferret
Oct 06, 2017 4:13 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Astral Rune build thread
Replies: 16
Views: 1345

Re: Astral Rune build thread

You are pretty much spot on with your calculations. I mostly ride singletracks so I'm not too concerned with "powered" top speed. I reach my highest speeds using gravity by letting off the brakes going downhill without touching the throttle. With the Castle controller on 12S "hot off the charger", t...
by ferret
Oct 06, 2017 1:45 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Astral Rune build thread
Replies: 16
Views: 1345

Re: Astral Rune build thread

I did turn down part of the spindle by a few hundredth of a millimeter. The bearings I used for the freewheel adapter have the same dimensions as the BB bearings, which are pressed on the spindle. I wanted to be able to install and remove the freewheel adapter without using a puller or high temperat...