Endless Sphere

I'm going to start rebuilding the vesc quite soon. Have the pcbs for the new version and am ordering the parts now. https://i.imgur.com/JDg9VGX.jpg I also realised the encoder has ABI incremental outputs. Since they only need to be used for startup the quadrature signals will only be a few khz befor...

I emailed mobipus a couple of months ago asking if it could do 60k erpm in foc. The response was that it was not possible in foc, but possibly in six step commutation. I've never used a mobipus controller personally so don't know if it will work. Would you be using sensored or sensorless? I don't th...

I replaced the genuine honeywell hall that was giving the false triggers with the original. It sounds a bit better but still a bit rough. Not sure why selecting "hall start sensorless run" in the asi software makes no difference. I tried on a vesc and it seemed to be fine. Still rough on halls at hi...

After replacing a hall I was having similar problems to the OP with the phase runner. https://i.imgur.com/wwm9bXz.png The left half of the screen is when the motor is being driven and the pwm waveform is being picked up by the hall wires and superimposed while the halls are pulled high. The right si...

I'm a bit confused. What is the problem with the infineon 18 fet with the 3 speed switch?

Sensorless parameters are: Starting current: 180A (I'm sure the full current is not used) Open loop injection current ramp time: 60ms Closed loop enable frequency: 16hz Open loop frequency ramp time: 250ms Open loop dc current hold time: 15ms Current is quite high to make sure it starts reliably eve...

spinningmagnets wrote: ↑

Jan 05 2019 4:06pm

Lebowski, open a Patreon account, and I will donate today.

Yes Patreon is a good idea. It seems like everyone and their dog has a patreon account these days

I got myself 3x 6s 6000mAh HK packs for Christmas. I set up a satiator profile for 18s. Buuuut the default profile was 20s and being a dumbass I charged the combined 18s to 82v :oops: . I'm not quite dumb enough to charge while I'm away from the house so I estimate they were sitting at 82v for about...

With rc lipo the voltage drops off sharply below 3.6v. The Sanyo GA cells will still have a decent amount of energy left when they are at 3.6v. You won't really make good use of your main 18650 pack this way. Not to say it can't be done. If you do decide to go this route I'd strongly recommend a bms...

Can we say that if the flux path between the magnets is poor, the potential for relutance torque is also poor? And lets assume we have a given motor and an induction meter, can we "measure" it's potential for reluctance torque, or the general potential for field weakening? Is it just always the dif...

evolutiongts wrote: ↑

Dec 29 2018 12:13pm

Are you able to get smooth startup from a stop while running sensorless?

It starts smooth enough and reliably. Main downside is that the startup routine takes up around a third of a second during which the motor is unresponsive to brake or throttle input.

evolutiongts wrote: ↑

Dec 28 2018 9:00pm

Are you running sensors or purely just sensorless?

No sensors. I've been considering emulating the halls with the encoder but I need to make it a bit more rugged and sealed against crap from the chain.

Impressive, how is the throttle modulation and control? Top speed? What are you thoughts so far? Are you freewheeling or direct drive? What are you running for a display? It is direct to rear wheel with no freewheel. I'm using regen. Display is CA. At the moment it is geared really high. Top speed ...

The hall combinations should not matter. The controller will figure it out when it spins the motor in sensorless during autotune. But if something prevents a repeatable hall sequence then autotune won't work. Since your sensors seem to toggle ok when turning by hand it should be possible to manually...

First proper video from the gopro I bought on boxing day. The ride itself isn't that interesting. Towards the end I climb a hill at 65kph which was fun.

Controller finally arrived from ERT after being probed by US customs for two bloody weeks. :evil: https://i.imgur.com/73FEWjH.jpg I've been busy in the mean time. Moved all the parts over to a 27.5 plus hard tail. A bit better off road, a sturdier frame and most importantly, better high speed stabil...

This talk of fw performance of spm motors reminds me of a phd thesis I read.



Search for "Design of permanent magnet motors for field weakening operation" by Chun Tang

Surely the one big heatsink or one cpu cooler should be plenty.

Ahah oh crap Bruno's YT video of my bike is still out there. However I can't put ANY sort of real load on it or it will cut out with phase over current error. I can sort of get it to stop doing that by raising the "current regulator bandwidth" setting but the best I've reached was not cutting out wi...

madin88 wrote: ↑

Dec 01 2018 1:17pm

I got a few photos of the motor and controller internals (the motor pic is from the russian member VasiliSK):

The size of the rotor is approx 100 x 32mm
12N10P design

The stator and rotor look like a larger version of the chinese trike motors.

A fellow is building a 150v vesc over on the vesc-project forum. https://vesc-project.com/node/655 Their project uses 200A allegro hall current sensors. From recent posts it looks like the board is up and running. I'm currently laying out a similar board for 18 fets and using 150A nominal/450A peak ...

Would you mind to let us know the supplier? Got it from cometkarts in the US. What is the reason for switching to a ASI 4000 Controller over a custom 18fet VESC ? Main reason is that the vesc died. Also when I installed the phase runner afterwards I found the braking and low speed performance was a...

Can you go into more detail or show some more pictures of your bottom bracket and mounting plate setup? I had the same idea of mounting a motor in front of the bottom bracket and driving the rear wheel directly on the left side. Specifically, it looks like you are running an ISIS bottom bracket? Is...

I needed more controllers (4000 and 8000) but after waiting over a month after ERT said my order would ship before I received it (experience detailed above) there was no way I could make another order from them. I bought instead from ASI and not only did my order ship ONE day after purchase, I get ...

Trying a 105t sprocket which is the largest 219 off the shelf tooth size I can find. It seems a lot quieter than my laser cut sprocket. Also less runout than the laser sprocket. Not sure why the laser cut sprocket has so much runout but it is a bit annoying to tension. https://i.imgur.com/MevDYcc.jp...