Search found 2682 matches

by madin88
Jan 17 2019 3:36am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Knight Electric Motorcycle 5000w
Replies: 22
Views: 477

Re: Knight Electric Motorcycle 5000w

skeetab5780 wrote:
Jan 16 2019 9:49pm
So i may have accidentally bought this bike...offered them $2500 and they accepted it.

Oh boy
Awesome!
which version exactly and is it street legal?
by madin88
Jan 16 2019 3:37pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Knight Electric Motorcycle 5000w
Replies: 22
Views: 477

Re: Knight Electric Motorcycle 5000w

Yes i thought the same about the fork legs, and then they added those brake caliper adapter for making it suitable for the large brake discs. Same thing on the rear.. When looking closer to the dropouts it seems they just used that small torque plate that comes with the motor, and no clamping mechan...
by madin88
Jan 16 2019 9:03am
Forum: Motor Technology
Topic: SiliXcon FOC Controllers, small, powerful and many features
Replies: 5
Views: 241

Re: SiliXcon FOC Controllers, small, powerfull and many features

It's the same guy that made this video. https://youtu.be/PcBaZ9sO9A4 I remember him posting about his Controller Company on here a few years ago. It used to be called PearControl :lol: :lol: Yes it seems like the company was split or is from pear control. Those are the specs of the smallest size, t...
by madin88
Jan 16 2019 5:18am
Forum: Motor Technology
Topic: SiliXcon FOC Controllers, small, powerful and many features
Replies: 5
Views: 241

SiliXcon FOC Controllers, small, powerful and many features

Hey guys, it happended that i came across mentioned controller company. I thought it would be of iterest here as these controllers have outstanding features like FOC with direct torque control, MTPA (maximum torque per amp) control and zero-RPM sensorless control. MTPA under field weakening would be...
by madin88
Jan 14 2019 1:56pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Knight Electric Motorcycle 5000w
Replies: 22
Views: 477

Re: Knight Electric Motorcycle 5000w

It's cheap and doesn't look bad, but it comes with SLA batteries and a hub drive which makes me think that overall quality will be questionable.
I mean, who is using SLA batteries on an electric bike these days?
by madin88
Jan 14 2019 4:43am
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 5017
Views: 473763

Re: Adaptto Mini-E/Max-E Owner's Thread

Only if theyre new.....got 15000 km on my Raptor battery out of samsung 25r and yes they drift more and more. At some point the adaptto bms cant catch up with the drift and you have to do it manually from time to time. Impressive number of km :) If a pack starts to drift, it usually means that one ...
by madin88
Jan 14 2019 4:22am
Forum: Items for Sale - New
Topic: Qulbix Q76R Frame Kits & Complete Bikes PRE-ORDER
Replies: 758
Views: 81514

Re: Qulbix Q76R Frame Kits & Complete Bikes PRE-ORDER

I added small nickel strips to put the cells in series typo? because the small nickel strips put the cells in PRALLEL (on one side only), and the wires make the series connection. When you built this battery, safety wasn't first priority, right? but it's good to see that it stays balanced so well :)
by madin88
Jan 08 2019 4:39am
Forum: E-Bike Technical
Topic: Sempu t2.3 torque sensor
Replies: 21
Views: 1292

Re: Sempu t2.3 torque sensor

If it *could* startup from torque alone it'd solve my problem, but I've been assured that it cannot. The CA applies power to the motor according to "human watts x assist factor" At 0RPM or very low RPM the power would be close to zero so thats probably the reason why it assumes the 50RPM if it dete...
by madin88
Jan 08 2019 4:10am
Forum: E-Bike Technical
Topic: Sempu t2.3 torque sensor
Replies: 21
Views: 1292

Re: Sempu t2.3 torque sensor

Since the CA assumes a baseline 50rpm as soon as it detects any pedaling at all, this operation will not be dissimilar from a pure torque-based getaway and never exceeding 50 rpm cadence. Aha thats a different thing.. If i think about the "assumption of 50RPM as soon as it detects pedaling", it mak...
by madin88
Jan 08 2019 3:40am
Forum: Large EV General Discussion
Topic: Tesla M3 teardown information video - Hallbach Array Motor
Replies: 15
Views: 412

Re: Tesla M3 teardown information video - Hallbach Array Motor

I don't believe its a halbach array. Yes i also think that it would not make sense to use a halbach array on an IPM motor (where the magnets are surrounded with steel), as the main advantage of halbach would be that it doesn't require steel for flux return. So why? Tesla was using four single piece...
by madin88
Jan 08 2019 3:27am
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 5017
Views: 473763

Re: Adaptto Mini-E/Max-E Owner's Thread

Does anyone have an idea bout this? Has anyone disconnected their battery wire from the controller with the BMS connected and didn't have any issues? I have wired an activ precharge circuit which turns off GROUND (negative supply) to the controller each time i turn off the bike after ride. No issue...
by madin88
Jan 08 2019 3:20am
Forum: E-Bike Technical
Topic: Sempu t2.3 torque sensor
Replies: 21
Views: 1292

Re: Sempu t2.3 torque sensor

According to what I've been told in the CA3 beta thread, the CA itself requires 50RPM minimum on the cadence sensor input before it will start outputting a throttle signal. I have set my CA to start at 16RPM (with Thun torque sensor), but i don't have the latest FW installed. Is start and stop RPM ...
by madin88
Jan 06 2019 8:56am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 82
Views: 1856

Re: SPM VS IPM Motor - And Field weaken, is it worth it

The torque equation for IPM is this one. Note that if you zero Iq (torque-producing current), Torque goes to zero. IPM torque.png Thank you for making it clear how it works. This makes me think that Nucular controller does FW not handle optimal at the moment (it is still beta), and Adaptto controll...
by madin88
Jan 04 2019 3:59pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 135
Views: 1912

Re: APL's DIY axial-flux motor

Might there be another general measurement for that? (Although, admittedly, I don't have a lot of choices for magnet sizes on this design) Stator tooth profiles can be changed, and good to know for next gen. projects. From what i know a general rule about the width of the magnets, or magnet coverag...
by madin88
Jan 03 2019 12:25pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 135
Views: 1912

Re: APL's DIY axial-flux motor

Its my understanding that the thickness of the back iron is a ratio to the width of the magnet. Meaning that for a given diameter of motor, having a few large magnets is less expensive, but requires thicker back iron. The same diameter of motor can be made with a higher number of magnets that are s...
by madin88
Jan 03 2019 10:47am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 82
Views: 1856

Re: SPM VS IPM Motor - And Field weaken, is it worth it

One bit here i meant to get back to you about madin is the 'unwanted regen/blowing fets' thing. -If the controller is half smart about it then it continues to supply field weakening current even when you are off the throttle to keep the motors generated voltage below battery level so no regen needs...
by madin88
Jan 03 2019 9:14am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 82
Views: 1856

Re: SPM VS IPM Motor - And Field weaken, is it worth it

It depends on how the Leaf motor is build. Getting power out of a motor is all about aligning the bemf voltage vector with the current vector (assuming no field weakening). You can show mathematically that the reluctance also follows this, i.e. the reluctance of the motor also results in a backemf ...
by madin88
Jan 03 2019 8:38am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 82
Views: 1856

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Hi Emoto, its not that both torques fight each other, its more for what purpose the motor designer designed the motor. The V-grove arrangement of the magnets is actually a very good one to reduce magnet mass to iron ratio with the side effect of a slightly higher max torque. But this is only the ca...
by madin88
Jan 01 2019 9:44am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 82
Views: 1856

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Lets take a look at Tesla Model 3 motor which is called "IPM-SRM" hybrid motor and has a large visible flux path between the magnet poles: https://c1cleantechnicacom-wpengine.netdna-ssl.com/files/2018/05/ACTUAL-Rotor-close-up-with-laminates-3.jpg the motor from Toyota Prius 2010 is similar: http://f...
by madin88
Jan 01 2019 9:08am
Forum: E-Bike Reviews & Testing
Topic: Epic 7kw+ 12 fet controller...or there abouts :)
Replies: 92
Views: 3309

Re: Epic 7kw+ 12 fet controller...or there abouts :)

New wire ends in place with the crimped down berrols. why you don't just cut off single strands until the wire fits into the bore? :D The 5.5mm bullets lets me insert the capacitor bank inline with any controller. The wires are 10 awg. The caps will not help much if they are not placed colse to the...
by madin88
Dec 31 2018 8:08am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 82
Views: 1856

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Madin, your post would indirect mean that field weakening cannot be used? But it can? It can be used, but i am quite sure there is a limit because of the body diodes in the Mosfets. The theory does it tell us (circuit diagram of a Mosfet power stage), and in practice i noticed that it is around 20-...
by madin88
Dec 31 2018 5:22am
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 5017
Views: 473763

Re: Adaptto Mini-E/Max-E Owner's Thread

Accidentally left my Adaptto Mini-E powered Fighter turned on during my Christmas holidays for about 10 days. :oops: Came back to find the battery down to 22%...just as well I have a monster 2.5Kwhr pack or it would have been toast. :roll: That equates to about 185Wh per day of idle consumption. Is...
by madin88
Dec 31 2018 5:07am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 82
Views: 1856

Re: SPM VS IPM Motor - And Field weaken, is it worth it

The flux path i was discussing there was the one from the V grove rotor not the qs3000w u posted up front. For the qs3000w u are right there is not much reluctance torque possible, it will only come by the magnets saturating the stator iron (5-10% max). The pictured rotor with the V-groove magnets ...
by madin88
Dec 30 2018 8:46am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 82
Views: 1856

Re: SPM VS IPM Motor - And Field weaken, is it worth it

I Think he is generalizing , as i am, the only twist here is comparing spm 68kv non fluxed to ipm 41kv ipm fluxed . at same speed. First you need to find a controller which can apply field weaken current already at 0 RPM, and second thing is you should have enough room left for BEMF to climb. Becau...
by madin88
Dec 26 2018 4:03am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 82
Views: 1856

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Is it true that SPM motors cannot make any reluctance torque? Almost every paper or study says the potential is zero, but wouldn't a rotor with less than 100% magnet coverage allow reluctance torque? Like the Surron motor which has steel between the magnets facing the stator (see yellow lines): 7sZj...