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by Hummina Shadeeba
Apr 14 2021 9:52am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1328
Views: 203846

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

I think to get max power out of the welder requires getting a battery powerful enough, which isn’t hard, and cutting its wires so the resistance is just enough that you don’t get an “over current” and the wiring decides the current. Or you could trick the calibration process and go beyond its amp li...
by Hummina Shadeeba
Apr 10 2021 12:38pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

Your criticism is appreciated. What I was hoping for. I play advocate looking for detractors who have a rationale. I learned about the ferrule.
by Hummina Shadeeba
Apr 10 2021 12:18am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

i was asking about how stacking .025mm copper would compare to multistrand for a bendable spot. https://imgur.com/a/zgOZjfx

but think has run it's course and the fantasy is over. i made pcbs with fat traces on them for a flexible battery already and was just wondering what people thought
by Hummina Shadeeba
Apr 09 2021 5:58pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

With a crimp the wire is supported at the ends and bending limited so the flex occurs in the loop. 1. With one or more strips, the mechanical fixing is via a tiny spot weld with perhaps 1% of the cross section of the strip so most of the strain may occur there. i can glue the strip where it contact...
by Hummina Shadeeba
Apr 09 2021 10:36am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

Adding the multi strand with a soldered ferrule at the rigid side and then crimps to multistrand may be the proven standard for making a flexible connection and im sure would be good but i think there's alternatives that MAY be as reliable. at this point im thinking if using stacked thin strip and t...
by Hummina Shadeeba
Apr 09 2021 8:48am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

i have some crimp tool and tons of crimps i never use really and end up always soldering. While crimps n ferrules may be better than solder for a wire that is repeatedly bent but i see no way to crimp .1mm copper strip to a ferrule and dont think it will be possible. it may be the best technique..im...
by Hummina Shadeeba
Apr 08 2021 9:57pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

How would you crimp spot-welded copper strip? Why wouldn’t you want to flex wire other than well into the wire? you mean if soldered? Maybe the bend radius need not be big depending on the amount of flex and more important it be consistent, but maybe as the metal is repeatedly bent it work hardens a...
by Hummina Shadeeba
Apr 08 2021 4:22pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

as you say thinner the better for being strong. i was doing .05mm strip i happened to have and see .025mm strip out there. as you say with the strands in a wire i think it can take away any stress points. in my pics the sharp fold of the copper stip is no good in that regard and i did it in the inte...
by Hummina Shadeeba
Apr 08 2021 3:34pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1328
Views: 203846

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

I’m getting repeated timeouts when calibrating and doing the “short” part. Luckily it still will weld just can’t calibrate again. Should I do Higher voltage? Pretty sure my battery isn’t to blame for a lack of power delivery, which I think is what the timeout means..not getting some amount of curren...
by Hummina Shadeeba
Apr 08 2021 3:32pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1328
Views: 203846

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

Why people say not copper. I’ve done thousands of welds of .1mm copper and some even .2mm copper if w a slit in it and that’s on the a123 cells which have a very thick can. This is thinner .05mm copper folded for better flex without breaking. https://imgur.com/a/zgOZjfx All welds here are the 2x .05...
by Hummina Shadeeba
Apr 07 2021 11:31pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

Tab strips are super easy to bend and break, probably takes about 3 or 4 complete folds to break Same goes for solid core wire Stranded wire is good for flexibility why would stranded copper be less likely to break than strip? they both in theory should have the same fatigue limit if the same thick...
by Hummina Shadeeba
Apr 07 2021 7:42pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

Fine-stranded tinned wiring, ideally marine grade UL 1426 rated (BC-5W2 usually 105°C) No movement at terminations obviously, just leave slack in the length portion. why would stranded copper be less likely to break than strip? they both in theory should have the same fatigue limit if the same thic...
by Hummina Shadeeba
Apr 06 2021 1:04pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 505
Views: 86049

Re: Spot Welding Copper Strips to 18650 Battery Cells

what would be a good conductor to use that could flex a lot? electric skateboards can have a lot of vibrations and flexing. I cant find a resource to compare the fatigue limits of pure copper vs pure nickel vs copper alloys vs other metals. Im seeing C15000 copper alloy with zirconium looking strong...
by Hummina Shadeeba
Apr 06 2021 11:58am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 111
Views: 6865

Re: True FOC: definition and examples

How likely and soon do you think till a reliable field-weakening program for the Vesc? I need 20% more speed!
by Hummina Shadeeba
Apr 05 2021 9:29pm
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 111
Views: 6865

Re: True FOC: definition and examples

Ianhill wrote:
Apr 05 2021 8:31pm


Im coming from an engineers point of view understanding the method as a whole enough to make use of the programs you help write,
you plug it in
by Hummina Shadeeba
Apr 05 2021 2:12pm
Forum: Battery Technology
Topic: Where dispose of potted lifepo4 battery
Replies: 3
Views: 168

Where dispose of potted lifepo4 battery

I have (98) 26650 A123 cells that are potted and I messed up and shorted two and am now trying to throw the whole battery away (a shame) but only seeing places that will accept smaller amounts of cells that are broken down. This potted battery will not break down without some intense deconstruction....
by Hummina Shadeeba
Apr 03 2021 10:03am
Forum: E-Vehicles General Discussion
Topic: 120v AC producing bike hub generator?
Replies: 15
Views: 330

Re: 120v AC producing bike hub generator?

You cant get 120Vac straight out of a motor without some kind of circuitry to convert dc to ac. When you turn a BLDC motor like those almost all of us use, it puts out three phase AC (with variable frequency and voltage). id make a two phase ac generator. https://www.youtube.com/watch?v=H_xFgn6UTOs...
by Hummina Shadeeba
Apr 02 2021 5:36pm
Forum: E-Vehicles General Discussion
Topic: 120v AC producing bike hub generator?
Replies: 15
Views: 330

Re: 120v AC producing bike hub generator?

I think Markz has a viable solution. Use your energy to charge a 12V battery to then run 12V appliances. Sounds good but don’t see a 12v tv, and going directly from pedal power to the tv I could potentially be most efficient. Splitting hairs there maybe but going direct from motor to tv is cool in ...
by Hummina Shadeeba
Apr 02 2021 5:03pm
Forum: E-Vehicles General Discussion
Topic: 120v AC producing bike hub generator?
Replies: 15
Views: 330

Re: 120v AC producing bike hub generator?

A pedal alternator will vary its AC frequency, voltage, and deliverable current according to fluctuations in pedal RPM and load. If I add a flywheel maybe I could produce some consistent ac that won’t fluctuate? Im only interested in producing ac from the bike and going directly to something like a...
by Hummina Shadeeba
Apr 02 2021 9:02am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 111
Views: 6865

Re: True FOC: definition and examples

Sensorless control methods can vary, but in general all three phases are producing some level of pulsating power, but once again it's more useful to think of the sum effect of the three phases as producing one rotating magnetic field vector that pulls the rotor magnet along. is that an fzr bike? wa...
by Hummina Shadeeba
Apr 02 2021 8:59am
Forum: E-Vehicles General Discussion
Topic: 120v AC producing bike hub generator?
Replies: 15
Views: 330

Re: 120v AC producing bike hub generator?

To run a 320W appliance on an inverter, you should expect to put in at least twice that much mechanical power before efficiency losses. How are you going to do it? thats why i want to make 120 AC directly and skip the losses of an inverter. im thinking maybe use some ac motor that runs at a speed s...
by Hummina Shadeeba
Apr 01 2021 10:35pm
Forum: E-Vehicles General Discussion
Topic: 120v AC producing bike hub generator?
Replies: 15
Views: 330

120v AC producing bike hub generator?

ac would allow me to run this directly https://www.kitchenwareonline.com/320-watt-microwave-and-12-volt-inverter-package-kit24-c2x27010742 i see youtube could have all my answers but i dont see the simplest version of producing ac and instead see alternator motors making DC and an inverter. And inef...
by Hummina Shadeeba
Mar 30 2021 1:41pm
Forum: EBike Build Threads
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 72
Views: 15446

Re: Neu 8057 6kW left hand drive hardtail with vesc and encoder

Is ur field weakening for the Vesc safe to use? How much faster do you go and at what cost?
by Hummina Shadeeba
Mar 30 2021 9:33am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 111
Views: 6865

Re: True FOC: definition and examples

are all three phases and their teeth producing usable torque when running foc or like trapazoidal waves is one phase being used to figure positioning?
by Hummina Shadeeba
Mar 30 2021 9:16am
Forum: EScooters/EMotorcycles
Topic: Sur-Ron - New Mid drive Bike
Replies: 5427
Views: 620638

Re: Sur-Ron - New Mid drive Bike

Be careful if you use an aftermarket controller such as Nucular or BAC regarding the field weakening. I have demagnetised my magnets with Nuc 24F and 20s15p VTC6 combination last summer when going max speed for around 10 seconds. Temperature from sensor never exceeded 98° celsius so the magnets had...