Search found 2734 matches

by madin88
Mar 18 2019 8:35am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 122
Views: 16107

Re: New build, BHT mid-drive "direct", custom frame

Did you paint the frame or is it powdercoat? Looks nice :thumb:
by madin88
Mar 18 2019 8:33am
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6588

Re: Revolt RV-series motor review and comparisons

From the looks the stator seems to be on another level in comparison to the previous revolt motors. Thank you for the pics! Why they decided to place the hall sensors beside the stator hanging free, and with a large gap to the magnets is kinda strange and also the thing with the large resistors look...
by madin88
Mar 14 2019 10:09am
Forum: E-Bike Technical
Topic: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)
Replies: 43
Views: 2309

Re: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)

Most ripple current comes for controller caps, PSU sees almost dc current Thanks for clarifying. What i noticed is when i was charging with Adaptto at 1600W, the charging lead (2 x 5mm²) did heat up alot more as it does now which would make sense now. So the thing with the caps was kinda overcarefu...
by madin88
Mar 14 2019 9:42am
Forum: E-Bike Technical
Topic: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)
Replies: 43
Views: 2309

Re: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)

eee291 wrote:
Mar 14 2019 9:17am
I doubt you needed that extra capacitor though since server PSUs have a pretty high switching frequency.
Yes, but the controller will do a step up conversion and so the caps on the output probably will see a lot more voltage ripple as they typically would.
by madin88
Mar 14 2019 9:31am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 3226
Views: 205151

Re: Sur-Ron - New Mid drive Bike

What length belt did you use. Fortunately we could use a standard size for the 25/93T gearing. It is 1440mm long. From my experience the best belt is the Optibelt Delta Chain carbon, followed by Gates Poly Chain GT carbon and the standard Gates Poly Chain GT (without carbon). The reason i would pre...
by madin88
Mar 14 2019 7:28am
Forum: E-Bike Technical
Topic: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)
Replies: 43
Views: 2309

Re: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)

I had to look for a new battery charger (48V PSU) for the Nucular controller because the one i was using for Adaptto before did not work. Back then i have built it into a case together with the coil, but it turned out that PSU + Coil does not work with the Nucular (at least at the moment there is no...
by madin88
Mar 14 2019 6:26am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 3226
Views: 205151

Re: Sur-Ron - New Mid drive Bike

Future test results: I full throttled the bike up a steep hill and the belt snapped. My friend lightly touched the throttle with his 8KW modified controller and battery and the belt snapped. :shock: just kidding, this was just a joke. I have seen that people added a second, pre-installed replacemen...
by madin88
Mar 13 2019 5:17am
Forum: E-Bike Build Threads / Photos & Video
Topic: Vector bike and frame owners.
Replies: 952
Views: 108062

Re: Vector bike and frame owners.

Does anyone have experience with this stand on the Vector frame? This kickstand looks similar as the one i bought for my vectors: https://endless-sphere.com/forums/viewtopic.php?f=6&t=68385&p=1310291&hilit=kickstand#p1310291 34.jpg If it does fit straightaway depends on your crank and frame geometr...
by madin88
Mar 13 2019 4:44am
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6588

Re: Revolt RV-series motor review and comparisons

I tried pwm frequency from 5 to 30khz in foc. At 30khz phase current was 6a. Dropping the switching frequency resulted in higher measured motor current. At 5khz it was over 15a. In trap mode it was about 7a. Controller was a vesc. That makes a lot of sense. If you would run this motor with 5kHz PWM...
by madin88
Mar 12 2019 6:35am
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6588

Re: Revolt RV-series motor review and comparisons

The AP motor has 3X MORE phase current under no load than the RV-120-regular. That doesn't sound like it's "better" to me. My test was simple. Connect the motor to the controller, crank the throttle to WOT and measure the phase current. I tried all 3 phases on both motors. They were consistent acro...
by madin88
Mar 11 2019 5:20pm
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6588

Re: Revolt RV-series motor review and comparisons

How can you have 22A phase and 3A battery at full speed no load? When i spin up my 8057 with Nucular controller, the display shows 1,5A battery and 7A phase current at 100% duty cylce. At no-load and without field weakening. The fact that it reads higher phase currents could have something todo wit...
by madin88
Mar 11 2019 9:24am
Forum: Motor Technology
Topic: Optimal Hub Motor design? Break down of BionX D-Series
Replies: 84
Views: 11626

Re: Need help with noisy BionX DV500

Greetings. Much of this thread (the EE part) is beyond me, but I have a DV500 here in Thailand that, after about 1700 km and then, over the course of 50 or 60 km, began to make so much noise as to become unrideable. The unit otherwise seems to operate normally and I don’t mind tearing it apart if t...
by madin88
Mar 09 2019 8:27am
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6588

Re: Revolt RV-120-regular

I pulled out my inductor tester and mOhm meter and tested all 3 phases for the below motors. Great! That brings your review to a new level :D RV-100-regular: 157kv .12 - .14mH 53.5 mOhms Does it really have such high winding resistance? Because that would be very poor for a motor this size. AP 1209...
by madin88
Mar 08 2019 4:52pm
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6588

Re: Revolt RV-series motor review and comparisons

When going through this thread it seems like you do not have much interest to do and share the measurements because so far it is only a discussion about what you like and what you dislike from the looking and some mechanical aspects. This is a bit annoying as the thread says "motor review and compar...
by madin88
Mar 08 2019 4:55am
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6588

Re: Revolt RV-series motor review and comparisons

What outrunner would you use? You will never find out by just looking at them :mrgreen: I must think about a situation where two people are standing in front of a painting and one says he likes it and the other one not. I do honest reviews...show the good and bad for the benefit of everyone. I've a...
by madin88
Mar 04 2019 5:37am
Forum: E-Bike Build Threads / Photos & Video
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 40
Views: 3362

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

The asi controller can push much higher phase currents. Not just because it is rated for more but also because it is less affected by the change in motor parameters as the stator begins to saturate. At higher currents this can cause the vesc to lose track of the rotor in sensorless mode. Wouldn't i...
by madin88
Mar 04 2019 5:29am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 230
Views: 6312

Re: APL's DIY axial-flux motor

Curious as to what kind of glue you wound up using? as glue i used Loctite 438 I bought magnets with epoxy coating and with a bit of grinding and cleaning i got great results. When i had to remove a few which i assembled wrong i had to realize that the glue joint was stronger as the magnet material...
by madin88
Mar 01 2019 5:24am
Forum: E-Bike Reviews & Testing
Topic: Epic 7kw+ 12 fet controller...or there abouts :)
Replies: 129
Views: 5158

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

ElectricGod wrote:
Feb 28 2019 6:11pm
What am I missing here?

Graphite conducts electricity...that means no bueno for mosfets.
Nothing, you just need to scroll down in the paper and you'll see that those graphite thermal pads are also available with one or two layers of insulation.
Dude! :roll: :)
by madin88
Mar 01 2019 5:18am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 230
Views: 6312

Re: APL's DIY axial-flux motor

21/26 = .88925 winding factor. 546 steps per turn. odd circuit. 21/28 = .86603 winding factor. 84 steps per turn. simple circuit. 26P looks indeed odd, but it should be the better choice. If you click on "advanced", you can see the winding factor of other pole counts and you also can enter stator d...
by madin88
Mar 01 2019 4:58am
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 1106

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

Interesting debate though. One the one hand you can argue for the status quo with "if it ain't broke, don't fix it", on the other hand a lot of established/standard practice is based on little more than "well, that's how we've always done it" rather than because it's been found to be the technicall...
by madin88
Feb 28 2019 6:09am
Forum: E-Bike Reviews & Testing
Topic: Epic 7kw+ 12 fet controller...or there abouts :)
Replies: 129
Views: 5158

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

Let me know when you can get graphite pads that DON'T conduct current! Until then, ceramic is the best option in a controller. scroll down the paper and you'll find :D I came across this recently in a topic about a big VESC controller where the guy plans to use them to increase the continuous power...
by madin88
Feb 28 2019 5:53am
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6588

Re: Revolt RV-series motor review and comparisons

Thank you for the review and the photos :thumb: What would be nice to have is a brief summary of the performance relevant improvements done on the RV100E in comparison to the PRO version. Things like: - phase to phase resistance - lamination thickness - kV and number of turns - no load losses at giv...
by madin88
Feb 28 2019 5:34am
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 1106

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

Stator field leads the rotor field by some angle of course, but is not spinning quicker. I have to disagree. The higher the pole count, the quicker the stator field will spin in relation to the rotor or motor shaft, which means the magnets and back iron does also see an alternating magnetic field. ...
by madin88
Feb 28 2019 4:37am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 230
Views: 6312

Re: APL's DIY axial-flux motor

The site from the link below contains some basic infos about motor design, and there is a winding simulator where you can enter a given slot and pole count, and it will tell you how efficient the windings will be in producing torque. A winding factor of 100 would be the best, but most motors have so...
by madin88
Feb 27 2019 11:41am
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 1106

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

"Iron losses" aren't a problem in permanent magnets or their backing. Because a constant flux doesn't generate eddies. If an eddy might begin, it fights to further hold the flux constant. Nd2Fe14B conducts more like pure iron than silicon steel, but doesn't want lamination or insulation. In fact th...