Search found 14663 matches

by fechter
Sep 28 2020 9:18am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 425
Views: 26281

Re: C Cab Hot Rod Power Advice

If you had a bar that goes across both actuators and push on the middle of the bar with a pivot, the force would always be equal on both actuators. If the pivot was off center a little, you could have more force on one side than the other if you wanted that. In your case, I think equal will be good.
by fechter
Sep 28 2020 8:22am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 425
Views: 26281

Re: C Cab Hot Rod Power Advice

There might be a tendency for one cylinder to travel a bit further than the other resulting in uneven force. I guess cars with dual cylinder brakes are like this too and they work, but I was thinking you might want some kind of linkage that applies equal force to both cylinders. If there is some adj...
by fechter
Sep 25 2020 3:32pm
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD: I'm skeptical
Replies: 27
Views: 3815

Re: BBSHD: I'm skeptical

Some versions of BBSHD had spade connectors but I don't think those are better than Andersons. I haven't seen many Andersons melt either. I use them on one of my hub motors running 2.5kW and they barely get warm. Possibly yours were not properly assembled from the factory. Bullet connectors should w...
by fechter
Sep 24 2020 9:32am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Domino Throttle
Replies: 50
Views: 15054

Re: Domino Throttle

For a 5k pot, you would want to use 1.6k fixed resistors in series with the #1 and #3 wires to give a 1-4v output that resembles a hall effect throttle.
by fechter
Sep 24 2020 9:29am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 5164
Views: 553555

Re: Sur-Ron - New Mid drive Bike

XT150 connectors are horrible. Very hard to plug and unplug, at least the ones I have.
by fechter
Sep 23 2020 2:11pm
Forum: General Discussion
Topic: Eternal outskirts of Moscow and beyond (LOTS of pics!)
Replies: 307
Views: 17910

Re: Eternal outskirts of Moscow and beyond (LOTS of pics!)

Nice. Seems like you should be able to charge your bike there with all those power lines. :wink:
by fechter
Sep 23 2020 2:01pm
Forum: General Discussion
Topic: Just had an earthquake in Los Angeles
Replies: 124
Views: 14781

Re: Just had an earthquake in Los Angeles

M 3.2 - 11km NW of Rancho Cucamonga, CA
2020-09-23 12:24:27 (UTC) 2.4 km depth
3.2 probably wouldn't wake me up either.
by fechter
Sep 22 2020 1:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue
Replies: 142
Views: 35009

Re: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue

Glad that worked out. I still wonder why Bafang made it that way. My best guess is to comply with some silly regulation somewhere but it really doesn't make any sense to me. Luckily the hardware hack is fairly easy. After pandemic madness, heat waves, earthquakes and massive fires, I'm ready for som...
by fechter
Sep 21 2020 11:39pm
Forum: E-Bike Technical
Topic: Is regenerative braking really worth anything?
Replies: 104
Views: 2325

Re: Is regenerative braking really worth anything?

Actual number from a hilly 46 mile trip
Img_1708.jpg
Img_1708.jpg (83.88 KiB) Viewed 246 times
by fechter
Sep 19 2020 2:54pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1848
Views: 134634

Re: la Nina rears her ugly head

2old wrote:
Sep 18 2020 11:15am
Isn't your AQI exceedingly low now?
Yes, thank goodness. Had a wave of moderate air yesterday and they are predicting more smoke tomorrow but then clearing again.
30 straight Spare the Air days was enough.
by fechter
Sep 18 2020 10:23am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1848
Views: 134634

Re: la Nina rears her ugly head

AQI in San Francisco = 1, Marin County (Fairfax) = 2; our friend(s) there get out and ride. AQI in the 70's here today; think I'll stay home. Rode eMTB with KN95 mask at AQI 120, temperature 98 degrees yesterday. Riding with a KN95 masks sort of sucks but better than staying inside. It really does ...
by fechter
Sep 18 2020 10:18am
Forum: E-Bike Non-hub Motor Drives
Topic: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue
Replies: 142
Views: 35009

Re: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue

I don't know anything about the Grintech PAS unit, but on the BBSHD, the grey and white wires are both pedal RPM sensors that are in quadrature so the MCU knows the pedal direction.
by fechter
Sep 18 2020 10:12am
Forum: E-Bike Non-hub Motor Drives
Topic: SURRON LB: RESEARCH & DEVELOPEMENT
Replies: 235
Views: 33021

Re: SURRON LB: RESEARCH & DEVELOPEMENT

Geez, that's pretty tall. I'll be interested to see how it looks installed.
by fechter
Sep 17 2020 5:24pm
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 425
Views: 26281

Re: C Cab Hot Rod Power Advice

Sweet!

Have you been able to test drive it yet? Looks like the brakes are mounted.
by fechter
Sep 17 2020 12:16am
Forum: Motor Technology
Topic: Yasa/Makani controller teardown
Replies: 15
Views: 486

Re: Yasa/Makani controller teardown

Great stuff. How about some pics of the motors. Sounds like they might be a bit too big for a motorcycle.
by fechter
Sep 16 2020 6:42pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1848
Views: 134634

Re: la Nina rears her ugly head

The marine layer to the rescue! Finally can breathe again, at least for now. Wind direction could change any time, so not sure how long this will last but I'm sure happy about it now.
by fechter
Sep 15 2020 2:49pm
Forum: E-Bike Technical
Topic: Controller Throttle Problems
Replies: 7
Views: 155

Re: Controller Throttle Problems

That's very strange. One possibility is something is pulling down the 5v supply going to the throttle. Could be any number of things including the MCU in the controller, the motor halls, or a bad voltage regulator. If you had a way to measure the 5v line while running the motor you could test for th...
by fechter
Sep 15 2020 8:39am
Forum: E-Bike Technical
Topic: Controller Throttle Problems
Replies: 7
Views: 155

Re: Controller Throttle Problems

It would almost have to be the throttle itself. You could test by using a voltmeter on the throttle signal line.

You could replace the throttle or if you are cheap like me, take it apart and put something in there to stop the travel at the maximum speed point.
by fechter
Sep 15 2020 8:36am
Forum: E-Bike General Discussion
Topic: 52 volt batteries proceed with caution
Replies: 26
Views: 810

Re: 52 volt batteries proceed with caution

Luna is selling them now, as well as Bafang USA Direct. None of those sellers make these packs, they buy them like this. Luna now makes their own packs which are some of the best designed on the market. I don't think they even sell the Hailong packs anymore for the exact reasons you are pointing out.
by fechter
Sep 15 2020 8:25am
Forum: E-Bike Technical
Topic: Is regenerative braking really worth anything?
Replies: 104
Views: 2325

Re: Is regenerative braking really worth anything?

There is a pretty long topic about this somewhere with actual measurements. On fairly typical riding I might get around 4% regen which isn't huge but it really helps with the braking. On rides in steep hilly areas I've gotten up to 15%, which is pretty significant. If most of your riding is in relat...
by fechter
Sep 15 2020 8:19am
Forum: Electric Aircraft
Topic: Exhaust fan on velomobile doubling as propulsion
Replies: 18
Views: 570

Re: Exhaust fan on velomobile doubling as propulsion

The exhaust velocity has to be much higher than the vehicle speed in order to get any thrust. I don't think the efficiency will be very good compared to driving the wheels. You could use something that looks like an electric ducted fan they use on RC model aircraft and probably get as much as you ca...
by fechter
Sep 14 2020 2:25pm
Forum: Motor Technology
Topic: Ferrite as a stator material?
Replies: 22
Views: 3684

Re: Ferrite as a stator material?

You might want to check out this thread: https://endless-sphere.com/forums/viewtopic.php?f=30&t=97860 He built a very nice motor using powdered iron cores. Ferrite is not good for motor (or alternator) cores since it saturates at a much lower flux than iron. If you really want lower core losses go f...
by fechter
Sep 14 2020 2:05pm
Forum: Large EV General Discussion
Topic: Electric kart
Replies: 162
Views: 40700

Re: Electric kart

nuxland wrote:
Sep 14 2020 1:45pm
accelerator wire got stuck
:shock: That could be pretty exciting.
by fechter
Sep 12 2020 11:52am
Forum: E-Bike Non-hub Motor Drives
Topic: SURRON LB: RESEARCH & DEVELOPEMENT
Replies: 235
Views: 33021

Re: SURRON LB: RESEARCH & DEVELOPEMENT

thoroughbred wrote:
Sep 12 2020 6:28am

does that battery consumption seem accurate? I think I'm burning over 60Wh/km offroad
If I ride mostly at top speed I see around 45Wh/km on the street. At lower speeds the consumption drops a lot.
by fechter
Sep 11 2020 1:23pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1848
Views: 134634

Re: la Nina rears her ugly head

Seriously bad air quality around the SF bay now.
PurpleAir 09-10-21.JPG
PurpleAir 09-10-21.JPG (166.55 KiB) Viewed 321 times