Endless Sphere

Interesting but certainly seems complex. It seems like there would be a sacrifice of torque density, but I didn't read the whole paper.

I think your current design looks pretty good.

I found the spokes were resonating on mine. I placed zip ties on the spoke crossings and it was greatly reduced.

Timelord wrote: ↑

Mar 25 2020 8:36pm

By the way, what is this topic doing in the Items for Sale forum? It should be in E-bike Non-hub Motor Drives.

Topic moved.

One test would be to get it running with the wheel up and slowly apply load while watching the voltage and current. See at what point does it trip. You can apply load with the brake if you disconnect the brake switch.

I think the iron in your picture above will act like a one turn short in all cases. If you slot the iron radially to break the circuit it will be better, but you will still have some eddy currents in the iron. Something non-conductive is really what you want.

Having another battery would be a good test but I assume you don't have one.

Can you post a picture of the battery connection? It sounds like possibly there is a bad connection inside the battery around the connector. You may need to try disassembling that part of the battery and look inside.

In the design shown, the stator core would need to be laminated to avoid being a one turn short.

What happened to the Alien lights?

Maybe next time...

Angry Bob is a known troll. You can ignore his bad manners. The crackling noise is interesting. I haven't come across that one before. The symptoms indicate a bad connection somewhere between the battery and the motor. If the crackling noise is due to arcing, there will be a visible burn mark somewh...

Rain keeps dodging my area. It was supposed to rain yesterday, but it was a beautiful partly cloudy day. I went out for a ride and could see some dark clouds way off in the distance. Nice to get out anyway.

San Francisco Bay in the background:

monster wrote: ↑

Mar 22 2020 12:46pm

Yes it seems there are some old throttles out there with the throttle hall sensor flipped over and a yellow instead of black wire.

If you hook them up to a regular controller it goes WOT

That could be exciting. Glad you got it sorted out.

You might have the wires crossed. With the throttle disconnected, you can use a meter to measure the throttle wires coming from the controller. The negative (ground) wire will be connected to the battery negative (use ohmmeter to find). The signal line will generally measure 10k - 20k ohms against g...

After i fully charged the pack (cell 11=4.04v) and waited one day, cell 11 dropped to 4.00v (compared to highest cell voltage of 4.13v). So i balanced cell 11 to 4.13v and after one day, it dropped to 4.06v. The other cells have held their voltage for two days (one cell dropped 0.02v which should b...

There are lots of them out there [for sale] if you look long enough Fechter, if I swapped-in some good street tires, what is the fastest top speed for a frame like this? 30-MPH perhaps? I'm occasionally doing 30-MPH on a beach cruiser frame (yikes!) Mine does 35 on a slight downhill. Seems very sta...

Not sure how that model is supposed to connect, but on a similar one I had, there was an "alarm" output line you have to wire to a relay to cut the power when the limit is reached. The documentation with those is sometimes lacking.

Good deal. Thanks for posting the solution. Lucky nothing burned up when the plug was backwards.

Higher tire pressure usually helps. Also be sure there is no oily stuff on the rim or the tire bead.

The creaking might be coming from where the cranks attach to the BB shaft. Make sure those and the pedals are tight.

Another way to look at it is the power will be volts x amps. When the phase amps are greater than the battery amps, it's because the motor is under load and not spinning at full speed, so the voltage across the motor will be less than the battery voltage. The battery (amps x volts) will always be sl...

Looking good. I love CAD (cardboard aided design). The speed switch works with any kind of motor. It simply limits the throttle. You can use a jumper wire or short the speed switch wires with a screwdriver to see what it does. It might be interesting to see what happens if you only slow down one mot...

Your hall and phase wiring looks good. Lots of people get stuck on that step or blow something up. Most controllers have a "3 speed" switch, but I guess yours is only 2. Just a simple switch. It should change the top speed. On the fancier controllers, you can program each speed as desired. On a bike...

Actually got a little over the weekend. Too dark to read the gauge but looks around 1/2" since Saturday. I went riding yesterday and the ground was damp but not muddy anywhere. Perfect riding conditions.

Good news. Can you tell if the motors reach the same top speed in forward vs. reverse? With some controllers, it will be the same, with some it may be much slower in reverse. The warm wires were indicating a very high current. Luckily the controllers were able to self-limit to avoid blowing (they ar...

Good sign you have 5v on the right lines. The hall sensor lines going to the motor get tested attached to the controller. Power on, no throttle, you measure each of the hall signal lines while slowly turning the motor by hand. Each one should toggle high/low as the motor turns. I'd be extra careful ...

My question is what is the code 12 setting (overvolt) in the stock bin file, are there alternate files (higher max volts) already, and how hard is it to hex edit & flash OE controllers? I don't think anybody has done that. The connector is easily accessible if you remove the controller. It's under ...