Search found 14935 matches

by fechter
Jun 11 2021 11:56pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 137
Views: 3689

Re: DIY Toroidal Axial Flux PM

I want one. Mine still has a vacuum tube and weighs enough to anchor a ship. I have an expensive Fluke Scopemeter at work and I'm not super impressed with it.
by fechter
Jun 11 2021 12:59pm
Forum: EBike Troubleshooting
Topic: Cycle Analyst V3 Speedometer doesn't show speed
Replies: 4
Views: 70

Re: Cycle Analyst V3 Speedometer doesn't show speed

Possibly they attached the speed sensing wire to the wrong place. Normally it would go to one of the motor hall sensor signal wires.
Installing a magnet on the wheel with a wheel sensor would be another way to fix it.
by fechter
Jun 11 2021 12:49pm
Forum: EBike Technical
Topic: Placement of thermistor
Replies: 2
Views: 56

Re: Placement of thermistor

Yes, just under the winding on the iron would be a good spot. I haven't had issues with noise, but I suppose it's possible. Since the temp signal changes very slowly, it can be heavily filtered to keep noise out. You can glue it in place with epoxy or silicone.
by fechter
Jun 11 2021 12:08pm
Forum: EBike Troubleshooting
Topic: Upgraded Fat Tire bike stopped running, something seems Burnt!!
Replies: 4
Views: 95

Re: Upgraded Fat Tire bike stopped running, something seems Burnt!!

Unplug the motor from the controller and see if the abnormal resistance to pushing backward disappears. If so, the controller is shorted. You can also check the controller with an ohmmeter once the motor is unplugged. Measure resistance from each phase wire to B-. Reverse the meter probes and measur...
by fechter
Jun 11 2021 8:47am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2102
Views: 147236

Re: la Nina rears her ugly head

lake mead.JPG
lake mead.JPG (94.23 KiB) Viewed 6 times
Currently at 36% capacity. They say it's the worst drought condition in 1200 years. The governor of Utah asked people to pray for rain. "While prayer doesn't hurt, it shouldn't be Plan A" (Dr. Fauci).
by fechter
Jun 10 2021 3:47pm
Forum: Battery Technology
Topic: Adding extender battery in parallel.
Replies: 8
Views: 112

Re: Adding extender battery in parallel.

Under the seat will be a good place. Well protected and the seat is too low to start with if you have long legs.

The capacity of the cells isn’t so important. You want the voltage sag under load to be close. Even if they aren’t I don’t think it’s going to matter that much.
by fechter
Jun 10 2021 9:39am
Forum: Battery Technology
Topic: Adding extender battery in parallel.
Replies: 8
Views: 112

Re: Adding extender battery in parallel.

I'm running a parallel pack on my Sur-ron made from Panasonic CGR18650DA cells, which are similar to the PF cells. My pack is 16s12p and about 30Ahr, so nearly equal to the stock pack. You can see some details here: https://endless-sphere.com/forums/viewtopic.php?f=10&t=101441 I wouldn't worry t...
by fechter
Jun 08 2021 8:45am
Forum: EBike Technical
Topic: Sur Ron: street legal vs "derestricted" vs "X" - acceleration?
Replies: 2
Views: 123

Re: Sur Ron: street legal vs "derestricted" vs "X" - acceleration?

As far as I know, all the X controllers will behave the same whether they are on the street legal version or the dirt version. They changed the controller at some date. The ASI can be programmed for much better acceleration, but you are limited by the battery. With a stronger battery, the ASI can gr...
by fechter
Jun 08 2021 8:39am
Forum: EScooter/EMotorcycle Build Threads
Topic: Electric Roadster
Replies: 142
Views: 8685

Re: Electric Roadster

Did you figure out why it went into a wobble? I've had bikes that did that at high speed. A steering damper can help, but shouldn't really be needed if everything is built right. I've heard that a loose front wheel bearing or loose swing arm bearing can cause this. Steering head angle also makes a b...
by fechter
Jun 08 2021 8:08am
Forum: Battery Technology
Topic: Running parallel battery pack. I need help please.
Replies: 36
Views: 701

Re: Running parallel battery pack. I need help please.

Heating is the limiting factor. Having very short leads will help as the heat can get dissipated by the battery on one side and the XT150 connector on the other side. For sure it will handle that much current for a short burst, but for longer durations it might get pretty warm. The amount of air coo...
by fechter
Jun 07 2021 9:50am
Forum: Battery Technology
Topic: Running parallel battery pack. I need help please.
Replies: 36
Views: 701

Re: Running parallel battery pack. I need help please.

You can run the packs in parallel. Just get the voltages really close before connecting. I have a similar setup on my Sur-ron. Two packs, each with their own BMS, in parallel. One BMS is a "single port" so it can protect during both charge and discharge. The other pack as a "two port&...
by fechter
Jun 07 2021 9:39am
Forum: EScooters/EMotorcycles
Topic: Sur-Ron - New Mid drive Bike
Replies: 5503
Views: 637434

Re: Sur-Ron - New Mid drive Bike

Interesting, this is what I figured you can't trust those notches. I think there is misinformation about this as some videos say to align based on the notches. When you did align with a straight edge did you need to use those little tension bolts to adjust the wheel? Was your alignment pretty close...
by fechter
Jun 07 2021 7:57am
Forum: EBike Build Threads
Topic: 14KW E-Scrambler From VoilaMart Frame
Replies: 12
Views: 393

Re: 14KW E-Scrambler From VoilaMart Frame

From reading around here and on YouTube I’ve seen a number of guys hit 60+ with the 5kw hub. Seems like the controller amps and the flux weakening optimized. Correct me if I’m wrong, but the stock Suron looks like it has a peak of 7kw and is wound for torque Ahhhh I see so you’re saying short burst...
by fechter
Jun 05 2021 1:33pm
Forum: EScooters/EMotorcycles
Topic: Sur-Ron - New Mid drive Bike
Replies: 5503
Views: 637434

Re: Sur-Ron - New Mid drive Bike

On mine, the notches are off a little from one side to the other. I'm running a belt, so alignment is critical. I used a straight edge across the rear sprocket that goes up to the jackshaft and adjust until they are lined up perfectly.
by fechter
Jun 05 2021 12:06am
Forum: EBike Build Threads
Topic: 14KW E-Scrambler From VoilaMart Frame
Replies: 12
Views: 393

Re: 14KW E-Scrambler From VoilaMart Frame

You will need a bigger motor to do 65mph for more than a few minutes. One of the motor simulators can tell you how much power it's going to take to go a given speed. 5kW might be OK for 45mph. That's close to a stock Sur-ron power.
by fechter
Jun 02 2021 3:45pm
Forum: Motor Technology
Topic: Kelly KLS & Revolt RV-160E watercooled : cogging noise and overheating
Replies: 18
Views: 487

Re: Kelly KLS & Revolt RV-160E watercooled : cogging noise and overheating

Holy crap, that is some serious toast. The magnets in the rotor are most certainly fried too.

So when it was "working", was the motor also turning the diesel engine?
by fechter
Jun 02 2021 8:04am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2102
Views: 147236

Re: la Nina rears her ugly head

Well, no new rain for months now. The entire west is looking pretty bad. The Colorado River might dry up.
Drought map May 2021.JPG
Drought map May 2021.JPG (96.55 KiB) Viewed 37 times
by fechter
Jun 01 2021 3:36pm
Forum: EBike Build Threads
Topic: Hub motor as mid (illegalbike)
Replies: 53
Views: 2998

Re: Hub motor as mid (illegalbike)

It looks like the Polish version of Endless Sphere:
https://pojazdyelektryczne.org/index.ph ... 35eb93f3f3
Cool looking bike.

The paint job came out looking nice. Now the battery...
by fechter
May 31 2021 11:12am
Forum: Motor Technology
Topic: Easiest to convert alternators?
Replies: 15
Views: 398

Re: Easiest to convert alternators?

If the shaft is magnetic, it will shunt a lot of the flux away from the teeth. You may need to make a new shaft from something non-magnetic.[/quote] Hello Interessant Do you have evidence for this statement! [/quote] Many years ago I built a PM rotor to use as a hydroelectric generator. I was using...
by fechter
May 30 2021 12:14am
Forum: Motor Technology
Topic: Easiest to convert alternators?
Replies: 15
Views: 398

Re: Easiest to convert alternators?

It's all apart now - except for the core. This nut on the shaft is the last thing in the way, and it won't budge with a drift. Such fun. :D The magnet I plan on getting is this one - although I will need to measure the shaft to be sure before ordering. This is the size the video I referenced used. ...
by fechter
May 27 2021 4:47pm
Forum: EBike Troubleshooting
Topic: Battery voltage drop overnight
Replies: 18
Views: 338

Re: Battery voltage drop overnight

Another possibility is the BMS is bad and constantly discharging the cell group. You could try disconnecting the BMS and see if that group still loses voltage over time. If the voltage holds steady without the BMS then you could replace the BMS.
by fechter
May 26 2021 8:03am
Forum: EBike Build Threads
Topic: Hub motor as mid (illegalbike)
Replies: 53
Views: 2998

Re: Hub motor as mid (illegalbike)

Most police don't carry around a wattmeter and wouldn't have a clue how to use one anyway. Way back, someone made stickers for their motor: https://endless-sphere.com/forums/viewtopic.php?f=31&t=35048&hilit=big+chicken+motor 4kW on a lightweight bike like that will be a lot of fun. :twisted:
by fechter
May 24 2021 2:11pm
Forum: EBike Build Threads
Topic: Your Creation's Before & After Pics
Replies: 1941
Views: 713943

Re: Your Creation's Before & After Pics

Audisport09 wrote:
May 24 2021 3:43am
Update: Extended the swing arm a little, managed to jury-rigged a QS205 V3 in place on the of 1kw 16’’ cast wheel. Proper quick little deathtrap now lol
I don't see any brakes. Guess that's why you call it a deathtrap.
by fechter
May 24 2021 8:25am
Forum: EBike Build Threads
Topic: Hub motor as mid (illegalbike)
Replies: 53
Views: 2998

Re: Hub motor as mid (illegalbike)

Nice work! If you added pedals, it would be easier to mistake as legal.