Search found 26 matches

by twikis
Jan 19 2020 11:09am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 526
Views: 63136

Re: QS 3000w midmotor

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 it's ...
by twikis
Jan 19 2020 10:22am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 526
Views: 63136

Re: QS 3000w midmotor

edit: The airgap seems to be quite narrow, that's nice Yep thats good for torque, but not so good for iron losses. It’s at 12.5A / 72V on my motor, don’t know exact voltage when i tried it. kv60 without flux Thats around 900W which i find is a bit on the high side for ~4000RPM on a motor like this....
by twikis
Jan 19 2020 10:14am
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 828
Views: 72723

Re: Votol EM-100 & EM-150 controllers

Well they just lost a few sells because of it ha

And thanks @Laerson, for putting the effort into trying this out!
by twikis
Jan 18 2020 1:55pm
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 828
Views: 72723

Re: Votol EM-100 & EM-150 controllers

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 with 3x1...
by twikis
Jan 18 2020 1:03pm
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 828
Views: 72723

Re: Votol EM-100 & EM-150 controllers

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 50 km...
by twikis
Jan 18 2020 12:43pm
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 526
Views: 63136

Re: QS 3000w midmotor

IPM optimized (e.g. Votol, ASI, maybe Nucular, haven't found any concrete info) controller, None of those controllers are IPM capable or have MTPA algorithm for IPM motors, it requires dynamic phase angle adjustment to the specific motor. APT96600 might work but the field weakening setting in my co...
by twikis
Jan 17 2020 10:18pm
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 526
Views: 63136

Re: QS 3000w midmotor

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 and...
by twikis
Jan 17 2020 8:49pm
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 526
Views: 63136

Re: QS 3000w midmotor

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 possible. A...
by twikis
Jan 16 2020 11:48am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 526
Views: 63136

Re: QS 3000w midmotor

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 300W @...
by twikis
Jan 16 2020 10:50am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 526
Views: 63136

Re: QS 3000w midmotor

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
by twikis
Jan 15 2020 10:15am
Forum: Motor Technology
Topic: Running a 96v motor (HPM3000B) at 68v
Replies: 7
Views: 852

Re: Running a 96v motor (HPM3000B) at 68v

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 motor t...
by twikis
Jan 14 2020 5:57pm
Forum: Motor Technology
Topic: Running a 96v motor (HPM3000B) at 68v
Replies: 7
Views: 852

Re: Running a 96v motor (HPM3000B) at 68v

While I didn't read the full detail of Vedder's article, nothing blatantly wrong stood out, so you're pulling his info out of context. For a given motor, when you run it at lower than intended voltage, you get proportionately less power from it. Power = Torque X rpm . Rpm is directly proportional t...
by twikis
Jan 14 2020 12:46pm
Forum: Motor Technology
Topic: QS 120 2000W phase to phase resistance
Replies: 0
Views: 950

QS 120 2000W phase to phase resistance

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 help me...
by twikis
Jan 14 2020 10:56am
Forum: Motor Technology
Topic: Running a 96v motor (HPM3000B) at 68v
Replies: 7
Views: 852

Re: Running a 96v motor (HPM3000B) at 68v

any downsides? If it's a 3kw motor at 96V, then the same motor is a 1.5kw motor at 48V, and for thick mud is simply not going to be enough motor except maybe for a kids' bike. Actually It's a square relationship (e.g. Benjamin Vedder explained it in this post ), so a 96V motor run at 48V, that's ge...
by twikis
Jan 14 2020 10:42am
Forum: Motor Technology
Topic: QS 90 1kW (edit: or maybe 120 2kW motor) with Kelly KLS controller in a Cityel
Replies: 6
Views: 648

Re: QS 90 1kW (edit: or maybe 120 2kW motor) with Kelly KLS controller in a Cityel

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 and c...
by twikis
Jan 13 2020 1:51am
Forum: Motor Technology
Topic: QS 90 1kW (edit: or maybe 120 2kW motor) with Kelly KLS controller in a Cityel
Replies: 6
Views: 648

Re: QS 90 1kW (edit: or maybe 120 2kW motor) with Kelly KLS controller in a Cityel

To me it seems very much like a sluggishly done test, it just could be much better, and at least some numbers are wrong. If we're lucky it's only the no-load power input, but how can one be sure about that... Well actually... Even with the current motor, which needs 10-12 seconds to reach 50 km/h, I...
by twikis
Jan 12 2020 4:37pm
Forum: Motor Technology
Topic: QS 90 1kW (edit: or maybe 120 2kW motor) with Kelly KLS controller in a Cityel
Replies: 6
Views: 648

Re: QS 90 1kW (edit: or maybe 120 2kW motor) with Kelly KLS controller in a Cityel

Hi amberwolf, thanks for your post and research done. The original "4.5 kW" motor is a Perm PMG 132 on 36V. But that's valid for 48V, at 36V it's only a 3kW constant motor (which is the standard setup it was delivered with; "sporting" three 12V lead-acid batteries, totalling 100kg. I'm using a 14kg ...
by twikis
Jan 07 2020 10:10pm
Forum: Motor Technology
Topic: QS 90 1kW (edit: or maybe 120 2kW motor) with Kelly KLS controller in a Cityel
Replies: 6
Views: 648

QS 90 1kW (edit: or maybe 120 2kW motor) with Kelly KLS controller in a Cityel

Hi guys, sooou I'm looking at replacing the motor in my Cityel (it's got an old, heavy and super inefficient forklift motor from the 1980s) with a brushless motor. I've put the QS 90 1kw in closer consideration, since it weighs 5kg (which should be enough, and also not to much, iron and copper for t...
by twikis
Dec 10 2019 9:12am
Forum: Items for Sale - New
Topic: MID drive 1500W (135€) and 3100W (280€) brusheless motors
Replies: 23
Views: 3526

Re: MID drive 1500W (135€) and 3100W (280€) brusheless motors

Hi Adam,

do you think it would be (with reasonable effort, so not using a hydrauclic press to push out a bearing or something...) possible to open the motor and put hall sensors closer to the rotor, so that it can be used with a Kelly KLS?

Thanks!
by twikis
Dec 26 2018 3:11pm
Forum: Items for Sale - Used
Topic: LiFePo4 26650 cells, A123 2500mAh (new too), Sony 3000mAh (new), K2 3200mAh, available as ready 2S-16S packs too, Europe
Replies: 2
Views: 888

Re: LiFePo4 26650 cells, A123 2500mAh (new too), Sony 3000mAh (new), K2 3200mAh, available as ready 2S-16S packs too, Eu

In what application were the K2 Energy cells used? How old are they/How many cycles have they had approximately/What's the remaining capacity? Could you post some pictures of the 8s4p, 12s5p and 12s6p packs? I'm planning to put them in my campervan as second battery, so I need to know if I can rip t...
by twikis
Sep 21 2017 9:26am
Forum: Battery Technology
Topic: 48V 10.4A 500W PSU Charger Mod, S-500-48
Replies: 0
Views: 340

48V 10.4A 500W PSU Charger Mod, S-500-48

Hi guys, so a friend gave me this power supply for cheap, and I've been wanting to convert it to be able to use it as an add on charger for my 11s Li-Ion pack. I'm fine with the voltage range (goes down to 41.4 V), so that's okay. The current limits at pretty exactly 18.4 A no matter the voltage (wh...
by twikis
Nov 03 2016 6:49am
Forum: Battery Technology
Topic: Another No Solder/Weld 18650 Build (Updated 03/09/2014)
Replies: 344
Views: 68712

Re: Another No Solder/Weld 18650 Build (Updated 03/09/2014)

Ah okay! I could only see the percentage thing mentioned here. So that means the force left after some time is exactly the same percentage as the recovery of the bumps immediately after unclamping? I just thought measuring it this way may be more accurate, as he mentioned that the bumps stick to the...
by twikis
Nov 02 2016 7:28pm
Forum: Battery Technology
Topic: Another No Solder/Weld 18650 Build (Updated 03/09/2014)
Replies: 344
Views: 68712

Re: Another No Solder/Weld 18650 Build (Updated 03/09/2014)

How about you try measuring the force (in grams) that the silicon has left after a certain time has passed, and compare it to the initial force (both in compressed status, maybe try different clamping forces/compression ratios to see how far you can go without damaging it/losing to much compression ...
by twikis
Oct 17 2016 9:39pm
Forum: Battery Technology
Topic: Fast charging until 4.2 V and then cutting off
Replies: 10
Views: 1042

Re: Fast charging until 4.2 V and then cutting off

Of course, cells need to be balanced.

Just wondering how many cycles (in percent) are lost when only doing CC to 4.2 V compared to doing traditional CC/CV (up to the same finish voltage)?

If it's just like 10-20 % percent I'm really wondering why e. g. Tesla isn't doing it
by twikis
Oct 17 2016 9:22pm
Forum: Battery Technology
Topic: Fast charging until 4.2 V and then cutting off
Replies: 10
Views: 1042

Re: Fast charging until 4.2 V and then cutting off

Ah yes right, short description would just be "stopping after the CC phase". :D (It's late here in Germany, having one of those sleepless nights....) That's what I'm thinking too, would just like to get some background info about it as I read somewhere that batteries that aren't charged via CV at th...