Recent content by crazymanc

As major said the back EMF of the motor has to be factored into the equation and this results in you needing more and more system voltage to get higher motor rpm. With regards to throttle response it depends entirely on how the system has been designed. Some will work in a way where the speed...

Storage for emergency backup possibly. Nevertheless batteries that don't self discharge is a step in the right direction towards eliminating/reducing their downsides.

Hmm, that was just for a bldc. There a couple of different configurations that these can take. Most computer fans are 2 phase, or 4 pole bldcs. That's what your motor could possibly be. 10 degrees doesn't sound particularly high for a motor with a low pole count though. I'm wondering if the...

My guess is it's wound like this with the white wire as the common that connects all coils to ground. Possibly at least. Try applying a small current down two of the wires and see how it cogs.

I was under the impression, from things I've read, that current lithium ion technology, as found in our 18650s, has reached a level of stagnation. That is we've kind of reached a theoretical maximum (energy density) for what the current chemistry can provide. This is why we haven't seen any...

EU countries can't see that.

I guess all the claims made by various companies are bunk then. I'm sure Toyota, for one, have said they'll be using solid state batteries by 2020.

Haha well I understand the problem with the mode of transportation, but the claims written by the super cap guys? Saying that batteries cannot accept the current levels required for efficient regen braking? That's obviously not true, unless we're talking emergency situations. I could see a...

Some of that doesn't make sense. Especially with regards to the regen braking. Rapid charging can provide in excess of 100kW straight into the battery so there's hardly a lack of charging capacity when needed. The only time this wouldn't be enough is if you needed to emergency brake... If...

That is interesting but would place a phenomenal amount of pressure on the charging system to keep your battery from exploding.

How is that a problem? A 1C discharge of a 10-12Ah cell is already as good as something like the NCR18650GA/PF at ~3C. If 2C of these new cells would be anything like 3C of the old ones (in the way then discharge curves compare) that'd make them ridiculously good. 20-25A discharge currents...

943 watt hours per kg...that's 4-5 times current 18650s... All these emerging battery techs, something needs to make it from the laboratory to everyday life.

That makes me wonder what the current hybrid busses I see around town have in them now. I always assumed that the onboard storage could soak everything that the regen could kick out but maybe not...if not then for sure that's a brilliant application for them. The same is true for an all...

With an energy density better than 115Wh/kg. The decent 18650s of today are at 200+ Wh/kg. 115 is certainly a very impressive figure for a completely chemical free solution. Not great for bikes or cars in a completely practical sense but it's a great step in the right direction. Of course...

You need voltage headroom over the motors back EMF to keep providing power at higher rpms. So if acceleration is really what you are after then voltage is what's required to get you there. That's the simple answer.