Endless Sphere

So if this ESC comes with the VESC software and the ESC is rated for 16S AND the VESC software has the option for field weakening... Doesn't that mean that it will work fine with the extra voltage from the BEMF as it's designed for it? Field weakening is not an option by default, so the 16s rating ...

rg12 wrote: ↑

Feb 18 2021 3:03am

Is field weakening a matter of software or hardware?

I would say it's mostly software, the hardware is the same except that you may want to have more headroom in the voltage rating of the controller, since the BEMF of the motor can go higher than the battery voltage when field weakening is used.

Yes, this VESC (and pretty much every other one) can work with regular throttles, they get connected to one of the analog inputs. Field weakening is something of a beta feature right now, you have to jump through some hoops to get the option to show up, but it does seem to work well enough as far as...

It seems pretty reasonable. Not sure what controls your relay (is it for flashing?), or how the brake signal works.

If you have a crappy fuse installed, the resistance of the fuse itself could be limiting your weld current. Worth trying a proper fuse IMO.

ebike11 wrote: ↑

Jan 28 2021 10:07pm

Is your air fork located inside the mid frame?

It's a DNM USD-8.

Overclocker wrote: ↑

Jan 28 2021 10:30pm

put some fox float fluid (the air chamber lube, not damper fluid)

or mix some SuperLube teflon grease w/ some fork oil. this solved my air leakage issue (not DNM)

Thanks for that suggestion, I'll give that a try

I hate having to pump up my air fork every 2 weeks. Maybe that's just because it's a DNM, but I wouldn't get an air fork in the future.

I am working on a chemical welding product and procedure, in order to make the joints very strong. Far stronger than the parts themselves; If you are worried about that... This part of your project will be quite interesting. If you were using ABS plastic, acetone would be great for welding the part...

-- -But often the throttle is cut off and the brakes are also likely to be bad, the brakes are mechanical switches, with higher bad possibility. I think people using VESC for ebikes/escooters are probably taking advantage of the variable regen capability, like I am. I'm using a hall-effect brake le...

1.The ADC input of ESC(based on VESC) is in float mode, and there is no filtering measurement. If this input port is left floating, it is easy to be interfered by electronic interference, and ESC will be misjudged by the signal voltage that requires the motor to run. The symptom is: the throttle is...

What do you use for performance monitoring at the terminal? Thanks for sharing what you use. I gave glances a try as it was available for RPi. It's quite informative but a bit slow to launch on the RPi. I usually use htop because it's lightweight and I like to see the load on the individual CPU cor...

I use linux for servers and embedded devices like raspberry pis. I find linux interesting and I still have a lot to learn.

Bringing this topic back from the dead... Fast forward a few years and now there are big printers on the market. I have the ANycubic Chiron with a 400mmx400mm print bed. It is huge and can definitely print a whole jumbo battery case. Is anyone else working on this topic ?? If you want to print out ...

The phones would have some kind of efficient DC/DC converter to step down to the battery voltage. Indeed, the current would be huge if you charge a single 3.7V cell with 100W. I'm surprised a phone would do that, but there must be lithium cells out there that can take such high charge rates.

I forgot to post an update here earlier, we have a video now showing these cell holders being used to build a 26650 pack: [youtube]veCY7lVOHZ8[/youtube] Also, from the Thingiverse page, the user 'aphotix' posted their build of an ebike battery pack, using the 3D printed holders as well as the box. T...

Steph, you raise a good point about the input current, I agree. As for your question, I think a lower battery voltage would give you higher efficiency in recovering the momentum of the bike, for the reasons we discussed. When you are braking, the motor voltage (BEMF) is being reduced proportionally ...

What will change when you change the battery or the motor winding is essentially the frequency at which the high fet is switched. So what I can see as potential efficiency impact are the switching losses (a few tens of nC per switch, I don’t think that will amount to noticeable effect) and impedanc...

The clip-art would be terifying for someone who is new and i would cringe myself. What matters is real life data. And i have that. The resistance of my system at extreme discharge rate is almost nothing and that is while vibrating the module. And i almost can bet that spotwelded sane amount of nick...

Could be a low cell group or flaky balance wire connection. Have you tried waking up the BMS by charging the battery?

Welding is not a proper way anyway. When welding, some heat gets through to cell electrolite which deteriorates cell more or less. Then you have nickel which is less conductive than copper. You cant weld 1.8mm nickel to the cell which would have equal throughoutput of my tabs not to mention contact...

If you have a 30A capable battery at 4.2V and you're running a circuit to a device that, according to its resistance and overall design, should draw 100 amps at that voltage like a power tool, it won't. It would draw 30 because the battery can only do 30. A battery (cell in this case) that's rated ...

Is the effect / The real world performance that it is 33kw because the phase amps are 350 but the voltage just lower of course or are you saying 14kw is always 14kw whatever you mix the amps or the voltage to the motor. Are there any advantages or is it just how the controller works. thanks Yes, I'...

Its calculated in a different way Battery amps and phase amps. Phase amps is true battery amps I guess but modulated or multiplied by a performance controller. I don't know how it works just that it gives a lot of power. Battery amps max is 150A Battery phase amps from the controller into the motor...

As a different option, have you considered connecting a brake signal to the VESC? If you do that, you can hold your brake lever/button when you're stopped and the throttle signal will be ignored.

I use that mode and throttle/brake setup on my ebike. I haven't tried it recently, but I'm pretty sure that when the brake is active, the throttle is ignored.

It would make no sense to have some strange subtraction mode.