Search found 680 matches

by nieles
Feb 11 2020 5:02am
Forum: Battery Technology
Topic: Will Copper Serial Connection Add Something?
Replies: 2
Views: 253

Re: Will Copper Serial Connection Add Something?

R=Rho * L / A rho of copper = 1.72 x 10^-8 at room temperature L = 0.19 meter A = 0.65 x 10^-6 meter^2 R = ( 1.72 * 10^-2 * 0.19 ) / 0.65 (i crossed off the 10^-6 on both sides of the divider) R = 0.005 Ohm R = 5 miliohm voltage drop = I x R = 10 x 0.005 = 0.05V = 50mV heat generated = Vdrop x I = 0...
by nieles
Feb 11 2020 4:01am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Motors with CE approval
Replies: 6
Views: 608

Re: Motors with CE approval

just make sure you buy the motor in Europe. nothing can be sold without CE in Europe. if the goods come from china, the importer/reseller is responsible for CE.
by nieles
Jan 27 2020 10:51am
Forum: E-Bike Non-hub Motor Drives
Topic: 1.7kg 1000w mid drive
Replies: 50
Views: 6116

Re: 1.7kg 1000w mid drive

Looks intriguing but who knows how refined the torque sensing will be. Seems like there is a wide variation among "torque sensing" drives. Hi Tom, the torque sensor is very refined. Comparing to a bottom bracket torque sensor is a different world. I'm not saying that because we're selling it, but t...
by nieles
Jan 10 2020 2:37pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

is it possible to disconnect the pcb track (cut the trace) close to the gate driver and close to the mosfet (ie not traveling on an inner layer). do you also have a solid ground point at the gate driver. if this is the case, i think you will still be able to test these pcb's if you use a twisted pai...
by nieles
Dec 03 2019 3:30am
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5493

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Ordering materials for a test batch)

how do you access the TO-220 screws once they are soldered to the PCB? i don't see any holes in the PCB for that or will it not be possible to remove the FETs from the heat sink once assembled? Of course I won't be able to out China China. You can totally out China, China. Just take someones money, ...
by nieles
Nov 29 2019 4:53am
Forum: Motor Technology
Topic: STSPIN devboard
Replies: 5
Views: 864

Re: STSPIN devboard

same result here. too simple algorithm used with the motor control bench. fine for pumps, fans. not so good for traction applications.
by nieles
Oct 30 2019 3:42am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 3007

Re: Sensorless From Standstill (SFS) explained

Hi Bas,

Thanks for releasing this, very interesting read.
I thought you wanted to sell this IP, What made you change your mind?
by nieles
Oct 29 2019 6:02am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

if you look at the wiring diagrams for the nucular controller you see he uses the motor winding's. if things overheat he suggests an external inductor in series. i would at least add some input capacitors, but i don't see them in the nucular schematics. theoretically you can use the output caps of t...
by nieles
Oct 29 2019 5:59am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

depending on the inductance and max phase current possible you *could* use the motor winding's. there are several parameters that need to be considered: pack voltage (given) charge current PSU voltage Inductor value max switch frequency max inductor current (inductor saturation current?) i did some ...
by nieles
Oct 28 2019 8:02am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

the adaptto controller can function as a boost converter (input voltage lower than min pack voltage) i cant find any documentation on this, but its pretty straight forward. the way they it works: disconnect a phase leads so you have access to the H-bridge battery stays connected in the same way as i...
by nieles
Aug 15 2019 1:21pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

Cool. Really what I'm looking for is field testing in application. The firmware won't need that much modification over the original VESC firmware to be compatible with my hardware. It's just minor tweaks to be compatible with the particular DRV I'm using. Anything else you want to do to the firmwar...
by nieles
Aug 07 2019 8:21am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

i think he would like to know you you are going to connect the two pcb? the brain and power pcb. atleast that is what i would like to know. (from the schematics) how will you guarantee the solderjoint is made on both the top and bottom pcb? are all solder joints reachable from both top and bottom si...
by nieles
Jul 12 2019 2:37pm
Forum: General Discussion
Topic: 1 number divisible by group of numbers [Excel?]
Replies: 8
Views: 900

Re: 1 number divisible by group of numbers [Excel?]

what you could to next to the sheet you have is the following formula. =number-TRUNC(number) this will give you the decimal part for the cell. next do the formulla =IF(number<=0.01,"OK",IF(number>=0.99,"OK"," ")) in this case, 'number' will be the one of the cells from your four calculated columns t...
by nieles
Jul 12 2019 10:11am
Forum: Motor Technology
Topic: Low KV 1000W BLDC
Replies: 43
Views: 2323

Re: Low KV 1000W BLDC

Why run a water cooling jacket if you can just use the environment water. Seal the front and back properly and make sure the moving water is guided over the cooling ribs of the motor. With an inrunner motor you will get pretty impressive cooling I think. As the water is in almost direct contact with...
by nieles
Jul 12 2019 5:32am
Forum: Motor Technology
Topic: Low KV 1000W BLDC
Replies: 43
Views: 2323

Re: Low KV 1000W BLDC

you might be able to get away with a lower power servo motor. and then use it a 1000W.
that is, if you can directly cool the motor with water
by nieles
Jul 12 2019 2:52am
Forum: Motor Technology
Topic: Low KV 1000W BLDC
Replies: 43
Views: 2323

Re: Low KV 1000W BLDC

i would go with a 6384 brushless outrunner motor and a neugart PLE gearbox 5:1 motor something like this: https://alienpowersystem.com/shop/brushless-motors/63mm/aps-6384s-sensored-outrunner-brushless-motor-200kv-4000w/ neugart PLE gearbox: pretty cheap on ebay. 36v with 200kv and 5:1 gives you 1440...
by nieles
Jul 08 2019 5:26am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

well as soon as money exchanges hands you become more or less a business. as people expect certain things from you. people will email you with (silly) questions. people not skilled enough will think they are, start the project and mess up. then come back to you with questions. good you are consultin...
by nieles
Jul 08 2019 4:20am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

its really a 'dificult' decision. as the answer is different depending on what you want to do, and your overall goal. as for a DFM perspective, 4 layer would be a no-brainer for this project. but as you say this is more a DIY (or semi DIY) project. so you don't need to pay for hand labor for beefing...
by nieles
Jul 07 2019 4:47am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

depends how you look at it. i see a 1,5 dollar raise on a product of 50-100 dollar. that is only 1.5-3% so you add 3% to the cost. but you add value in lower overshoot and more copper for the high power traces. if you can get away without beefing up the traces manually this will save a lot of labor ...
by nieles
Jul 07 2019 4:09am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31573

Re: Serious FOCer (84V VESC 6 based controller)

Is this a 2 layer or 4 layer board? If 2 layer, I would seriously consider switching to 4 layer and remove those TH gate resistors. That's really not the place to use leaded (inductive) parts.
Switching from 2 to 4 layer will only add 5-10% cost on the PCB in volume production IIRC.
by nieles
May 21 2019 7:56am
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 212
Views: 27551

Re: Cheap FOCer (VESC 4.12 based design)

You don't have to use the standard pin headers. You can use whatever connector you want with 0.1" pitch. You also can just solder wire directly in the connector thru-holes for a reliable connection. Yes I have considered other connectors but for my newer controller design. Which ones? From what I s...
by nieles
May 14 2019 2:52am
Forum: Items for Sale - Used
Topic: LG Chem lgx p1 16s1p 15Ah 10C
Replies: 9
Views: 1803

Re: LG Chem lgx p1 16s1p 15Ah 10C

also interested in the specs (or datasheet if you have it)
by nieles
May 13 2019 1:47pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 212
Views: 27551

Re: Cheap FOCer (VESC 4.12 based design)

TEK0000.JPG Switch Node @Vsupply = 54V Ok so I fired up the beta version in the lab. @54V there was only a spike of 55.6V at no-load. This is much better than the prototype and is most likely due to the improved layout. The owner of the dyno I was using before is currently using it for his own test...
by nieles
Apr 28 2019 9:26am
Forum: Motor Technology
Topic: Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app
Replies: 417
Views: 49197

Re: Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app

Just fyi; prio level 0 and 2 are for the softdevice, 1 and three are for application. At work we do not use different irq prio levels, because this this gets complicated rather quickly! Especially with large projects. Better to keep the same level, this way you know the irq functions won't be interr...
by nieles
Apr 18 2019 3:59pm
Forum: Motor Technology
Topic: Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app
Replies: 417
Views: 49197

Re: Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app

To clarify: the possibility to get the bootloader encryption keys with or without the manufacture acceptance, should let anyone flash at a distance (using Bluetooth) the bootloader and the firmware, working or non working versions (and in this case render useless the SW102 if flashing no working bo...