Recent content by twikis

Well when subtracting the 1 mOhm of the 1m 16mm² phase cable off of that, you get 4 mOhm internal resistance. At e.g. 500A that's only 1000W copper loss, which is great! Also means though, that this motor simply is wayy to big for my 50 km/h Cityel, and I'll get the 120 2kW for it (hoping that...

If it's high or not, mostly depends on the internal resistance (which the important number I haven't found yet). Judging by the numbers I've seen, it could be as low as 5-7 milliohm, so not to bad actually

Well they just lost a few sells because of it ha And thanks @Laerson, for putting the effort into trying this out!

Ah well I've already got a Kelly KLS6018S... Phew, 5 is a lot though Read the whole thread, but no info about lowest LVC. I've got a 11s24p 18650 DIY battery because it's the maximum voltage battery you can put in a Cityel, without risking damage to the rest of the hardware (originally came...

So I'm trying to decide between a Kelly KLS and Votol EM-150SP, but I'm uncertain about a few things: 1. Since I'm running a 11s battery; can the Votol be set to a LVC of ~30V and still run reliably at that voltage? 2. For legal reasons I'd like to have the option to limit the speed to exactly...

Oh wow okay, basically I just guessed those controllers would try to find out the optimal angles during initialization, since I thought there wouldn't be much to it (spin it up slowly, while it's spinning up play around with phase angle to find out the lowest consumption at e.g. 10 rpm-points...

Ok here's one more question: Has anybody done a (more or less) direct comparison between running this motor with an IPM optimized (e.g. Votol, ASI, maybe Nucular, haven't found any concrete info) controller, that shifts the field around to utilize the extra torque-per-amp (and thereby efficiency...

Interesting. To get faster and more accurate readings (mounted like this, the reading will always be at least a few degrees under the actual copper temp when the motor gets hot), I'd glue it to the windings with a blob of any (high temp) 2 component glue, + maybe remove the rubber cap if...

Thanks @pitmix! Is the first spin up in the video without flux weakening, and second, third and fourth with flux weakening at different flus weakening levels? If yes, than those numbers match up with yours @ larsb, when you include belt and wheel losses And would mean no load losses of around...

Hi, has anybody measured the no load draw of this motor? Or could someone maybe just lift up the rear, spin the motor up and note power+rpm, that'd help me out a lot. Thanks, Matt

Awesome idea @amberwolf! When you double the voltage and keep the same gear ratio, you end up with about twice the speed. Since speed and air resistance are in a square relationship, you need roughly 4 times the power to overcome air resistance for twice the speed. Incl. higher losses in the...

Whoops. Sorry and yes, you're right. No idea what got into my head there regarding the square relation lol Still, pole count is one of the most important factors, rpm wise. Any given motor with double the pole count, all other factors being the same, will have about twice the torque and half...

Because I want to heavily abuse :D (meaning, run it a much lower voltage than it's designed for) this motor, I'd love to know the phase to phase resistance of it, to determine if it'll be able to handle the acceleration + uphill power I need from it... Has anybody got one of these, and could...

Actually It's a square relationship (e.g. Benjamin Vedder explained it in this post), so a 96V motor run at 48V, that's geared the same top speed, only is a 750W motor. Or in your case @Overclocker, the HPM3000B will only be half as powerful @68V as when run @96V. If that's enough for you or...

Yes, the PMG132 are quite good motors (even in optimal conditions with sub-standard brushlife), when run in the right direction (in the Cityel they are running in reverse direction) and at their designed voltage (60V). There are a few problems with them running in reverse; 1. the timing is off...