Search found 3190 matches

by Lebowski
Jun 24 2019 11:18am
Forum: E-Vehicles General Discussion
Topic: Mercedes new ISG system, with 48V lithium battery
Replies: 4
Views: 58

Re: Mercedes new ISG system, with 48V lithium battery

Sounds very much like what Suzuki does, but they have an alternator style device coupled to the motor via a normal belt. It can act as starter, generator and motor, but it all goes through the belt.
22_SWIFT_SHVS-mild-hybrid.jpg
by Lebowski
Jun 16 2019 12:18am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 345
Views: 15117

Re: APL's DIY axial-flux motor

Are you sure you cannot rotate the one rotor plate, and measure the AC voltage of the individual windings when you do so ? This is a good test for each coil and for your coil interconnections.
by Lebowski
Jun 16 2019 12:13am
Forum: E-Bike Build Threads / Photos & Video
Topic: Hacking a Couple Stromers
Replies: 110
Views: 28744

Re: Hacking a Couple Stromers

Ok thanks ! Than the one on the local auction site is not for me...
by Lebowski
Jun 15 2019 6:08am
Forum: E-Bike Build Threads / Photos & Video
Topic: Hacking a Couple Stromers
Replies: 110
Views: 28744

Re: Hacking a Couple Stromers

What are the dropout for the ST1 motor ? 135 mm ?
by Lebowski
Jun 13 2019 7:59am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 44
Views: 1387

Re: Ampera/Volt inverter with Lebowski brain

Nissan Leaf makes 280Nm up to 2800rpm then it goes into isopower knee. However i think this could vary with different voltage. I could provide 420Vdc and could move the knee to the right by some 2000rpm. Then i would get 250Nm at 5000rpm which i intend to do later with my car. Limitation here is th...
by Lebowski
Jun 13 2019 4:44am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 345
Views: 15117

Re: APL's DIY axial-flux motor

for which voltage to expect you'll have to go on the internet and search how much flux your magnets produce. then with the amount of winding you'll stand a chance of calculating it. Easier is to measure one coil (take motor apart, use thin wires to connect coil to outside world as no current is flow...
by Lebowski
Jun 13 2019 1:49am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 345
Views: 15117

Re: APL's DIY axial-flux motor

APL wrote:
Jun 12 2019 9:06pm
YG- .50v at 135rpm.
YB- .50v at 153rpm.
GB- .50v at 154rpm.
looks like the B phase generates less voltage than Y and G... (assuming star connected windings)
by Lebowski
Jun 11 2019 7:55am
Forum: Motor Technology
Topic: Bionx controller replacement
Replies: 9
Views: 348

Re: Bionx controller replacement

Hoping to score some bionX motors on the local el-cheapo 2nd hand website, but am a cheapskate so my offer may not be high enough.

They would be a perfect test vehicle for a new and experimental completely sensorless but with full torque from standstill controller build...
by Lebowski
Jun 10 2019 2:11am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 345
Views: 15117

Re: APL's DIY axial-flux motor

What do you mean with wire in series, did you put all 7 coils of one phase in parallel ? If this last case, no wonder you have lots and lots of losses...
by Lebowski
Jun 09 2019 10:59am
Forum: Alternative Energy
Topic: Build a 5m rotor diameter
Replies: 11
Views: 379

Re: Build a 5m rotor diameter

I would go vertical, somehow seems easier for diy...

https://en.m.wikipedia.org/wiki/Vertica ... nd_turbine
by Lebowski
Jun 08 2019 12:21am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 345
Views: 15117

Re: APL's DIY axial-flux motor

My recommendation https://endless-sphere.com/forums/viewtopic.php?f=30&t=46476&start=25#p698230 Scroll down to picture dsc01169 Basically this is the motor put together only halfway. Only one rotor plate with all the stator wiring accessible. The single rotor plate will still induce backemf in the s...
by Lebowski
Jun 06 2019 3:16pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 345
Views: 15117

Re: APL's DIY axial-flux motor

I dont think that matters, and think you should check for shorts in the wiring. Try to measure is the motor wires are somehow shorted to rotor iron (maybe a tight winding has damaged the insulation). The separate the three windings and measure their resistance to see if one is different fro the othe...
by Lebowski
Jun 05 2019 7:28am
Forum: General Discussion
Topic: The most basic demonstration of why you should consider a recumbent..
Replies: 21
Views: 780

Re: The most basic demonstration of why you should consider a recumbent..

Got rid of my recumbent... did not like being on the perfect height for breathing the maximum amount of car fumes possible.
A regular bike puts me above the typical car exhaust and in the cleaner air.
by Lebowski
May 30 2019 7:26am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 44
Views: 1387

Re: Ampera/Volt inverter with Lebowski brain

Point 1 may still be caused by motor resistance not correct, you will need to experiment a bit. Or have a look in the saved conkout data (main menu y, only if you online saved else itll just be the old data) to see what happened. About takeoff, if at full current the torque is not enough it wont go....
by Lebowski
May 30 2019 5:14am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 44
Views: 1387

Re: Ampera/Volt inverter with Lebowski brain

I am looking at the lebowski2.txt file from a few posts ago. Maybe it is tripping (? you mean conking out ?) at high erpm because the settings in the erpm menu: a) erpm limiter (forward) rampdown start, end: 49.97, 50.00 k-erpm you need to give it some room to ramp down the power as erpm approaches ...
by Lebowski
May 29 2019 10:46am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 345
Views: 15117

Re: APL's DIY axial-flux motor

Did you check, for each phase, the bemf voltage of the 7 coils in series ? Is it roughly 7 times the voltage of 1 ?

Putting mine together, got my fingers squashed a few times as the rotor halves really attract each other...
by Lebowski
May 29 2019 9:49am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 44
Views: 1387

Re: Ampera/Volt inverter with Lebowski brain

Interesting drive in what way ?
by Lebowski
May 16 2019 12:46am
Forum: General Discussion
Topic: Tesla switches to permanent magnet reluctance motors and sees range gains
Replies: 17
Views: 742

Re: Tesla switches to permanent magnet reluctance motors and sees range gains

.. but if you make the same increase of torque (2X), by increasing the rotor diameter (2X) , but the weight increases 4X ( square law for volume) would 2x diameter not give you 4x torque ? 2x because of twice the arm (diameter) and again 2x because there are twice the amount of teeth ? If correct t...
by Lebowski
May 14 2019 6:22am
Forum: General Discussion
Topic: Tesla switches to permanent magnet reluctance motors and sees range gains
Replies: 17
Views: 742

Re: Tesla switches to permanent magnet reluctance motors and sees range gains

That's quite the post! How about the cliff notes version? These motors seem awfully similar to BLDC.. what's the difference between the two? Just like BLDC, switched reluctance motors make a backemf. Problem is that it disappears when there is no phase current flowing. The nice thing of small magne...
by Lebowski
May 13 2019 1:28am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 44
Views: 1387

Re: Ampera/Volt inverter with Lebowski brain

If you use 200V instead of 380V the FOC measurement needs to be re-done (see the manual). As this changes the R you also need to re-enter the 50 mOhm. Even though indicated L and R (should) stay the same, the internal variables that are used throughout the controller IC depend on the voltage used du...
by Lebowski
May 07 2019 6:12am
Forum: General Discussion
Topic: Endless fear banning!
Replies: 5
Views: 437

Re: Endless fear banning!

Facebook still exists ? I though the #metoo movement would have shut it down or sued the pants of it by now... but maybe they don't realize that it all started by a horny bunch of male students building a website to judge the attractiveness of the female students.
by Lebowski
May 07 2019 3:27am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 44
Views: 1387

Re: Ampera/Volt inverter with Lebowski brain

Hm, looks like a factor 10 off from the 50mOhm the controller needs. Probably the DC resistance is not the way to measure this. When you apply an AC current to the motor windings you get losses which will not show up when applying DC. An example, the losses from Eddy currents in the stator iron. Oth...
by Lebowski
May 06 2019 1:38pm
Forum: E-Bike General Discussion
Topic: Switzerland
Replies: 25
Views: 672

Re: Switzerland

Just as a general rule here in Switzerland, everything fun is VERBOTEN ! They do verbiet some really weird things. You probably think "helping someone vomit" in the middle is weird - but who wants to do that on tram with a stranger? Right next to it on the left: "not knowing something". Now, this i...
by Lebowski
May 06 2019 4:00am
Forum: E-Bike General Discussion
Topic: Switzerland
Replies: 25
Views: 672

Re: Switzerland

Just as a general rule here in Switzerland, everything fun is VERBOTEN !
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