Search found 35 matches

by Fligh High
Apr 28, 2011 7:04 am
Forum: E-Bike Non-hub Motor Drives
Topic: All Your Agni Are Belong To Me
Replies: 32
Views: 3119

Re: All Your Agni Are Belong To Me

Is that mold on your wall behind the rack or the result of horrific chemical experiments with batteries....

And :

If from experiments : What exactly caused them
If mold : Do you happen to live in Louisiana or so

Just curious :)
by Fligh High
Nov 01, 2010 7:52 am
Forum: Motor Technology
Topic: Resistance and Inductance of Motors and Controller Parts.
Replies: 31
Views: 4164

Re: Resistance and Inductance of Motors and Controller Parts

Fantastic measuring device. Lfp I hope you will keep showing more examples of whatever that can be measured with this thing ! because it is really interesting. Do you think it can show differences in induction in layered board / layered busbar design compared to non-layered or doesn't it work like t...
by Fligh High
Sep 16, 2010 5:31 am
Forum: General Discussion
Topic: such a badass driver...
Replies: 5
Views: 528

Re: such a badass driver...

I'm actually doing/ help organise an auto-x/slalom myself this weekend. It's more fun oriented than competetive but we have an absolute great abanded ex-military terrain for our use and we can set up a reasonably fast course. The parking-lot slaloms are nice but waaaayy to slow/small for my liking. ...
by Fligh High
Aug 27, 2010 1:18 pm
Forum: E-Bike General Discussion
Topic: Why, wHY, WHY must a saddle be so hard and narrow!?!
Replies: 31
Views: 1930

Re: Why, wHY, WHY must a saddle be so hard and narrow!?!

Ahum...cough....I imagine the above horse-shoe saddle is for the male bike pedaling species ? (why on earth did I already have a hunch it would eventually come to this after the first topic post :lol: ) Looks like an absolute must have for Scottish Kilt wearing cyclists ! You can just let it "hang t...
by Fligh High
Aug 14, 2010 9:29 pm
Forum: Motor Technology
Topic: Re-wind of a turnigy 80/100 (Now-tutorial w/Video)
Replies: 421
Views: 65537

Re: Thuds re-wind of a turnigy 80-100

http://i32.photobucket.com/albums/d10/tmoto/P8140007.jpg It is always really difficult to believe at first sight that there is more copper in your rewind in comparison to the original, the eyes see much more "volume" of copper with the thinner strands !! Still amazing how insulation and diameter of...
by Fligh High
Aug 08, 2010 4:28 pm
Forum: E-Bike Technical
Topic: 100v+ Battery Build.
Replies: 19
Views: 1020

Re: 100v+ Battery Build.

It gets even better :lol: :lol: just read what Mighty Volt wrote 2 posts above .....
The Mighty Volt wrote: it's general asthmatic nature
epic , EPIC !!!! (poor Mighty Volt , sorry but this is such a fantastic FROCK UP , can't help myself...... :twisted: )
by Fligh High
Aug 08, 2010 4:06 pm
Forum: E-Bike Technical
Topic: 100v+ Battery Build.
Replies: 19
Views: 1020

Re: 100v+ Battery Build.

Mighty volt , since this is for an e-bike and you don't get so much out of breath as would be with pedal power alone this is definately the thing you need if you are into smoking !! Just wire it up to a 12v source and you are good to go :D What can be better as smoking a cigar , a cig or even a nice...
by Fligh High
Jul 28, 2010 6:50 am
Forum: E-Bike Technical
Topic: Awesome new FET package :) :) :) Not a geek? you won't care
Replies: 75
Views: 5954

Re: Awesome new FET package :) :) :) Not a geek? you won't

The limit you're seeing on the other FETs is the package limit (how much current the leg/bond-wires can hold) showing a plateau. This FET has a lead structure designed around handling many hundreds of amps, so you don't see this package limit plateau, and you see only the silicon limits reflected i...
by Fligh High
Jul 27, 2010 8:05 pm
Forum: Motor Technology
Topic: 12 kw rc motor
Replies: 1876
Views: 173224

Re: 12 kw rc motor

Still impressive to see such a small motor size-wise powering a complete car ! :) Couple of years ago I would have had difficulties with believing it is even possible.

It's not easy to get a capable controller for testing , hope it will work out.
by Fligh High
Jul 27, 2010 7:34 pm
Forum: E-Bike Technical
Topic: Awesome new FET package :) :) :) Not a geek? you won't care
Replies: 75
Views: 5954

Re: Awesome new FET package :) :) :) Not a geek? you won't

The Ixys looks great hope this will work out. The isolated tab is already worth it ! It even looks very good for producing them factory-wise in many numbers , fantastic future product to be. My knowledge isn't that great concerning mosfets but I tried to compare the Ixys to TO-247 , it's about the e...
by Fligh High
Jul 16, 2010 8:00 pm
Forum: E-Bike General Discussion
Topic: I am DETERMINED to build a bike that can do this!
Replies: 56
Views: 2933

Re: I am DETERMINED to build a bike that can do this!

No need to have something super light weight for fun , better build it strong to last and save your money for other fun stuff. Think Hub motors are out , and btw half the speed this guy is going is also fine.... Video is awesome , he's got skills ! One word of caution though : Please , PLEASE don't ...
by Fligh High
Jul 04, 2010 8:14 am
Forum: E-Bike Technical
Topic: **Important** reality check on motor, voltage, current etc.
Replies: 360
Views: 21111

Re: **Important** reality check on motor, voltage, current e

Yes without phase current control the controller should match the motor , the capacitors will let the mosfets dump any current the motor wants but you will not see that in the battery current shunt as this measures only average . How does this simple controller know what load it is attached to ? it ...
by Fligh High
Jul 03, 2010 8:19 pm
Forum: E-Bike Technical
Topic: **Important** reality check on motor, voltage, current etc.
Replies: 360
Views: 21111

Re: **Important** reality check on motor, voltage, current e

Isn't the whole phase current stuff not easy to see on a scope ? Use low resistance shunt or maybe even the phase wire itself and see what the current does with the different PWM rates...

It may give an easy answer to all this discussion :)
by Fligh High
Jul 03, 2010 7:09 pm
Forum: E-Bike Technical
Topic: **Important** reality check on motor, voltage, current etc.
Replies: 360
Views: 21111

Re: **Important** reality check on motor, voltage, current e

I think this point is generally 3-4 times battery current, but may be as low as only e (2.78) times battery current. It must be something like this in practice. I read into your first posts a bit of "conservation of energy" and the idea that if duty-cycle goes down then current must go up proportio...
by Fligh High
Jun 28, 2010 8:38 pm
Forum: E-Bike Non-hub Motor Drives
Topic: 14kw continuous 94% efficient motor.......
Replies: 393
Views: 43685

Re: 14kw continuous 94% efficient motor.......

Haha , just something else : "very common 1/2 inch ID, 1.125 inch OD bearings" I am amazed it's still inch sizes and not metric ! , even though general manufacturers what I know have gone that way for quite some time even in the good old U as of A (slight pun intended from a european :wink: ) But wh...
by Fligh High
Jun 28, 2010 7:37 pm
Forum: E-Bike General Discussion
Topic: At what speed..
Replies: 23
Views: 1568

Re: At what speed..

After what Dogman said about the temperature and what is still comfortable in very hot weather with a visor : Is there a niche on the market that is not catered for ? A bicycle lycra-guy type helmet with the "open" beam like construction over the head , AND a visor at a distance because of ventilati...
by Fligh High
Jun 28, 2010 6:56 pm
Forum: E-Bike Non-hub Motor Drives
Topic: 14kw continuous 94% efficient motor.......
Replies: 393
Views: 43685

Re: 14kw continuous 94% efficient motor.......

>Matt , newbie here :wink: doesn't know half about what's going on here really and is constantly looking for info to learn... but I just looked at the design picture on page two of the big out-runner Colossus ( that is what Katou / you refer to ? ). That IS a big bearing........... And NO I don't th...
by Fligh High
Jun 28, 2010 6:25 pm
Forum: Motor Technology
Topic: When to go from PWM to Block coil commutation ?
Replies: 9
Views: 1018

Re: When to go from PWM to Block coil commutation ?

>Whatever thanks , there is a lot of information about driving brushless DC motors in general (also Hall's) but not that much info about the whole commutation process ( I mean : powering the coils that is) what I've found on the internet. But if someone can shed any light on what is happening in the...
by Fligh High
Jun 28, 2010 5:55 pm
Forum: E-Bike Non-hub Motor Drives
Topic: 14kw continuous 94% efficient motor.......
Replies: 393
Views: 43685

Re: 14kw continuous 94% efficient motor.......

> katou : Holy moly , yes a 5 inch diameter outer size bearing would have problems making a lot of RPM but that's not needed for our applications though ? What did you mean with the 5 inch diameter application , did I miss something in this thread ? or did you mean in general ? >recumpence > That yo...
by Fligh High
Jun 28, 2010 4:53 pm
Forum: E-Bike Non-hub Motor Drives
Topic: 14kw continuous 94% efficient motor.......
Replies: 393
Views: 43685

Re: 14kw continuous 94% efficient motor.......

>Katou , I don't think bearing speed is the problem but much more that the right bearings are not chosen for the application ... I think a lot of bearing choice in high-power semi- RC motors (because that is what they look like , just a bit bigger than what the RC guys use) are simply chosen to smal...
by Fligh High
Jun 23, 2010 6:51 pm
Forum: Motor Technology
Topic: Hall sensor placement
Replies: 5
Views: 1870

Re: Hall sensor placement

> Tiberius , thank you for such a clear , condensed and understandable explanation of Hall sensor placement. I wish you had written some application-notes by various big companies , they would be so much more easier to read .... As Einstein said , if you can't explain it to your grandmother you have...
by Fligh High
Jun 22, 2010 6:17 pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 43942

Re: e-Buggy: Alternator Conversion

Oh well forum-bandwidth isn't costing me any money , I'll shove a big boot under it and kick it up yet again. Widodo is probably still waiting for the AGM to arrive .... :wink: zenon , salty9 , Harold in CR , krumpi , dajsinjo , magnusvr , bzhwindtalker : Any results , updates , wants or needs or ex...
by Fligh High
Jun 22, 2010 7:25 am
Forum: Motor Technology
Topic: When to go from PWM to Block coil commutation ?
Replies: 9
Views: 1018

Re: When to go from PWM to Block coil commutation ?

Okay sounds logical to me . LFP thanks for pointing out max allowed battery current completely forgot about that. Another question : How long does the commutation last from point A to B ? Because we have the varying duty cycle PWM at less than full throttle or a single full block-pulse at full throt...
by Fligh High
Jun 20, 2010 8:14 pm
Forum: Motor Technology
Topic: When to go from PWM to Block coil commutation ?
Replies: 9
Views: 1018

Re: When to go from PWM to Block coil commutation ?

Olaf, for sure , I understand that eventually PWM will become a single blockpulse automaticly if the dead-time will become zero . Maybe it would have been better if I would have named the topic : "How does a controller for a brushless E-motor actually work ?" or something like that. And yes you migh...
by Fligh High
Jun 19, 2010 3:52 pm
Forum: Motor Technology
Topic: DIY motor. Out of wood???
Replies: 7
Views: 770

Re: DIY motor. Out of wood???

Just by chance read about it on ES before lots of info :

viewtopic.php?f=30&t=14134

Plywood is fantastic stuff :D I think you can build anything you want with it !