Search found 2070 matches

by parabellum
Oct 17 2020 5:51pm
Forum: Items for Sale - New
Topic: PV NextGen FOC 130v 200/600A 25kw - $599, Watch Display
Replies: 261
Views: 28873

Re: PV NextGen FOC 130v 200/600A 25kw - $599, Watch Display

One is Maximum Torque Per Amp (MTPA) that seems most interesting. Here is more on it: https://hackaday.io/project/164932-axiom-100kw-motor-controller/log/179447-mtpa-merged-into-vesc I am planning on adding this feature in the next firmware update. Cool, I didn't know Axiom is working on VESC and M...
by parabellum
Oct 16 2020 9:43pm
Forum: Items for Sale - New
Topic: PV NextGen FOC 130v 200/600A 25kw - $599, Watch Display
Replies: 261
Views: 28873

Re: PV NextGen FOC 130v 200/600A 25kw - $599, Watch Display

IPM motors just make more sense. Can you recommend some IPM motor that can take 25KW and works well with your controller? (I suppose it works with backwards "field weakening" logic of IPM) Running AC motors in FOC would be a matter of software update. Thanks, in my understanding, when/if vesk gets ...
by parabellum
Oct 15 2020 10:34pm
Forum: Items for Sale - New
Topic: PV NextGen FOC 130v 200/600A 25kw - $599, Watch Display
Replies: 261
Views: 28873

Re: PV NextGen FOC 130v 200/600A 25kw - $599, Watch Display

Are there plans for this controller running ACIM algorithms and taking sine cosine resolver or encoder input?
by parabellum
Oct 10 2020 8:52am
Forum: Battery Technology
Topic: Copper strips instead of nickel?
Replies: 33
Views: 4665

Re: Copper strips instead of nickel?

want to build wrote:
Oct 09 2020 10:13pm
could you retype it i feel there is missing caracters or at least i can not understand it
Nickel is 24% of copper conductivity, which means ~4 times more losses compared to copper conductor.

https://www.avoutlet.com/images/product ... solder.pdf
by parabellum
Oct 07 2020 11:43pm
Forum: Battery Technology
Topic: Copper strips instead of nickel?
Replies: 33
Views: 4665

Re: Copper strips instead of nickel?

want to build wrote:
Oct 07 2020 11:28pm
what does the lose of energy looks like with nickel.
to have an idea .
one cm cube for 1meter cube? if you havea visual comparison so i can decide how much it weights in my decision

tx
Cooper : Nickel = 1:4 (loss of energy)
by parabellum
Sep 23 2020 8:05pm
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 178
Views: 26927

Re: Buick Lacrosse 2012 e-assist moto-alternator

arber333 wrote:
Sep 20 2020 2:06pm
Here is the working version of Huebner inverter with lacrosse motor. I still have some things to resolve but i have positive throttle control with resolver interface. Mostly it seems to be EMI.
https://youtu.be/7Xq03S_Bpwg
Nice. Can you show the Inverter?
by parabellum
Aug 29 2020 4:47pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 386
Views: 64855

Re: Spot Welding Copper Strips to 18650 Battery Cells

I Kweld manual says 4-30V input 2,000 amp max so I'm thinking of putting two of my 12.8v nominal A123 9.6ah packs in series for 8s or 25.6V Nominal with still a CCA of 250 or 400. I might need to also run some more in Parallel too. Any insight on using LiFePO4 on Kwelder???? https://thumbnails-phot...
by parabellum
Jul 12 2020 3:50am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1478
Views: 156120

Re: Nucular electronics - complete kit for ev! [beta]

PITMIX wrote:
Jul 12 2020 3:04am
Are you ready to spend $ 200 on the delivery of a 12F or even a 24F? I prefer to pay $ 50 and wait until the post office does its job.
You are getting wrong something, I paid 15usd for 125usd, 44lbs pack on Friday. FedEx.
by parabellum
Jul 12 2020 2:54am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1478
Views: 156120

Re: Nucular electronics - complete kit for ev! [beta]

Perhaps lowering the price to $200 or slightly less and than including a mandatory service charge to make up the difference. Or require a completely separate/dual-stage invoice in order to ship the product(s) but only have the first receipt available to FedEx "Technical support service", aditional ...
by parabellum
Jul 08 2020 9:37pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1478
Views: 156120

Re: Nucular electronics - complete kit for ev! [beta]

If the 24F comes compatible with a sin/cosin encoder there wil be a whole new world of motors in the picture. Can't waith untill you got this encoder running on the Nuc. A lot off verry good quality motors run only sin/cosinus encoders. Also, many asynchronous motors with sin/cosin encoder are sitt...
by parabellum
Jun 09 2020 1:00pm
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 773
Views: 187296

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

Thanks for your thoughts, I agree that if the fuse blows it may damage the plastic - but if this happens the whole battery needs tearing down and cell replacing in any case. What I mean is, his thermal camera reading have no value if they show 626F nickel melting temperature. I may simply cop the '...
by parabellum
Jun 09 2020 12:03pm
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 773
Views: 187296

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

He tests them under a thermal camera, and at 3a they keep a pretty stable 55deg f, which seems to basically be ambient. It blows at around 8-9a and at 626f. Nice video. My concerns rises a nickel fuse that is glowing white and liquefying at polycarbonate (plastic) melting temperature instead of see...
by parabellum
Jun 09 2020 10:02am
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 773
Views: 187296

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

Thanks, that makes sense. Is that 'acceptable' the same as the 'acceptable' in the OP, so for example 0.1mmx5mm = 3A acceptable? Not that much of acceptable, here we have a "nickel" fuse link that must heat up to 1500C to blow, OP is calculating nice cool conductor. It is acceptable as fuse link (a...
by parabellum
Jun 09 2020 9:40am
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 773
Views: 187296

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

I assume, they where behind the 8A instant blow value and considering nickel, which is not the best fusing material, with its high melting temperature, all ended at this low cross-section. Assuming: Nickel 1mm2 R at 20C = edit 68Ohm/1000m Link cross-section =0.2mm2 Link length =20mm Current =3A We g...
by parabellum
May 06 2020 4:51pm
Forum: Motor Technology
Topic: Buick Lacrosse 2012 e-assist moto-alternator
Replies: 178
Views: 26927

Re: Buick Lacrosse 2012 e-assist moto-alternator

From what i've been searching, i only saw expensive industrial resolver/encoder converters, so probably it would be better to contact OP and ask for help or schematics on how to make your own converter board. I did search for encoder to resolver conversion some years ago and only found expensive in...
by parabellum
Apr 05 2020 6:34pm
Forum: Large EV General Discussion
Topic: Sevcon Gen4 fault
Replies: 2
Views: 803

Re: Sevcon Gen4 fault

Zero resistance is a blown Fet. It is probably 1 blown in parallel aray but it is difficult to identify without desoldering, unless it is physically damaged. It is also a good habit to change the whole parallel group as the rest could take some damage to and Fets should be matched as well. Said that...
by parabellum
Oct 24 2019 1:30pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172784

Re: kWeld - "Next level" DIY battery spot welder

ElectricGod wrote:
Oct 22 2019 11:51am
Has anybody tried welding aluminum with the KWeld?
Spiningmagnets is probably right. Watch the video below, nice trick.
by parabellum
Jun 25 2019 4:42pm
Forum: Battery Technology
Topic: High Voltage high current DC power supply
Replies: 13
Views: 1851

Re: High Voltage high current DC power supply

Nice find.
Did someone try to run it on 120AC for <2000W out?
Original specs are 85-300AC <17A input, I wonder if any mode was done to the input /AC side by the seller.
by parabellum
May 16 2019 9:52pm
Forum: E-Bike Technical
Topic: Modifying a shunt with controlled results
Replies: 58
Views: 22554

Re: Modifying a shunt with controlled results

I have some switches, but they are common ones rated at 16A. But I need at least 21A, because the two shunts give me 42A total. But I will give it a try anyway, because I rarely use full throttle it's already very powerful even on quarter throttle. Why do you need a switch? If you remove or cut 1 s...
by parabellum
Apr 26 2019 10:38am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1478
Views: 156120

Re: Nucular electronics - complete kit for ev! [beta]

VasiliSk, are there any future plans to code in ACIM motor support/algorithm? :)
by parabellum
Apr 23 2019 6:09pm
Forum: E-Bike Non-hub Motor Drives
Topic: OpenEMoto
Replies: 98
Views: 19910

Re: OpenEMoto

trazor wrote:
Apr 02 2019 1:16am
take some build techniques that don't require expensive tooling.
Amazing performance with such simple hand tools! Your video definitively is a source of inspiration to me. Thanks for taking time!
by parabellum
Mar 23 2019 3:18pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115634

Re: APL's DIY axial-flux motor

Nice project!
cut that will direct air onto the center of the coils, in either direction of rotation
Do you think they will work that way? Maybe more like centrifugal fan, despite the scoops?
by parabellum
Mar 23 2019 2:50pm
Forum: Battery Technology
Topic: Yet another 18650 battery build.
Replies: 77
Views: 8293

Re: Yet another 18650 battery build.

With BMS you don't know what is going on until your pack is not working. I don't trust BMS boards made in China and I'm definitely not paranoid if comes to Li-ion batteries. Except it is BT BMS that has a big display and BT connection to your Android to show you more then your testers will ever show.
by parabellum
Mar 21 2019 9:28am
Forum: Battery Technology
Topic: LiFePo4 starter battery BMS with only 2 leads?
Replies: 20
Views: 1336

Re: LiFePo4 starter battery BMS with only 2 leads?

You might be able to just add some shunt resistor across the existing ones to increase the trip point. As long as you don't crank for too long, it shouldn't overheat. Some circuits come with a thermostatic switch to kill output if it overheats. Yea, that is nice suggestion I will use on my next bat...