Search found 978 matches

by tostino
Sep 16 2010 11:20am
Forum: E-Vehicles General Discussion
Topic: Are there any LARGE BLDC motors?
Replies: 51
Views: 13459

Re: Are there any LARGE BLDC motors?

Luke, you would still have rear brakes ;)... Ya forget about regen? Pretty sure it would work well for that.
by tostino
Sep 16 2010 11:06am
Forum: E-Bike Technical
Topic: building my own lifepo4 batt question.
Replies: 23
Views: 1870

Re: building my own lifepo4 batt question.

November, I built a pack using konions, and soldered using the same method you used for your pack it seems :p. Big iron (in my case, two smaller irons at the same time) for a really short period of time. Then I cooled with a wet sponge. My pack is not quite as big ad DB's though lol, but it is 51v27...
by tostino
Sep 15 2010 7:55pm
Forum: E-Vehicles General Discussion
Topic: Upsize Tadpole + 8kw hub
Replies: 18
Views: 1826

Re: Upsize Tadpole + 8kw hub

Lol think bigger! That hub motor looks like a beast, and that 8kw rating really means nothing. Hell, I want to push my 9c to higher power than that :p. I'm currently getting 5.6kw out of my 9c. With the right controller, that motor should take a lot of power without batting an eye. You won't be able...
by tostino
Sep 15 2010 3:27pm
Forum: Battery Technology
Topic: Can I Jump Start A Car?
Replies: 17
Views: 1489

Re: Can I Jump Start A Car?

Not completely related, but I used my Meanwell powersupply to jumpstart my car. It's not even a 12v version (configured for 29v), but since it's cc/cv, it worked just fine.
by tostino
Sep 15 2010 3:27pm
Forum: Battery Technology
Topic: Can I Jump Start A Car?
Replies: 17
Views: 1489

Re: Can I Jump Start A Car?

Not completely related, but I used my Meanwell powersupply to jumpstart my car. It's not even a 12v version (configured for 29v), but since it's cc/cv, it worked just fine.
by tostino
Sep 15 2010 1:26pm
Forum: E-Vehicles General Discussion
Topic: Upsize Tadpole + 8kw hub
Replies: 18
Views: 1826

Re: Upsize Tadpole + 8kw hub

Mhm, not to mention just how much power it can put out if needed. If you could get a kelly controller set up for 24s lipo, it would be even cheaper. The 6s packs are just about the same price, and have an extra cell in each.
by tostino
Sep 15 2010 1:00pm
Forum: E-Vehicles General Discussion
Topic: Upsize Tadpole + 8kw hub
Replies: 18
Views: 1826

Re: Upsize Tadpole + 8kw hub

That is the phase current limit, alright cool. So it has a peak of 350 phase amps (for 30sec). Which means that if your battery can provide that many amps, you will see a peak of 25.9kw (before losses). Lets see, a lipo pack from hobbyking... http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idPr...
by tostino
Sep 15 2010 11:26am
Forum: E-Vehicles General Discussion
Topic: Upsize Tadpole + 8kw hub
Replies: 18
Views: 1826

Re: Upsize Tadpole + 8kw hub

Well what size pack were you looking for? What voltage? What ah?
by tostino
Sep 15 2010 10:34am
Forum: E-Vehicles General Discussion
Topic: Upsize Tadpole + 8kw hub
Replies: 18
Views: 1826

Re: Upsize Tadpole + 8kw hub

Now to figure some weights. 100 ah Calb= 683 lbs
This is why lipo is nice :p. Crap load lighter than that!!! Not to mention more dense volumetrically. Probably about the same cost too, if not cheaper lol
by tostino
Sep 15 2010 8:23am
Forum: Motor Technology
Topic: 12 kw rc motor
Replies: 1876
Views: 208984

Re: 12 kw rc motor

did I scare everyone?? :roll: Haha Nope I am just waiting for my balls to come in and I am shoping for houses and about to drive down to help luke kick ass! Arlo1 as you can see from above this is why toolman2 and I are really interested in your RPM measurement. Once we got to around 4 and 1/2 thou...
by tostino
Sep 12 2010 1:33pm
Forum: E-Bike Technical
Topic: Best DC - DC converter for 36s lipo down to 12-14v?
Replies: 7
Views: 622

Re: Best DC - DC converter for 36s lipo down to 12-14v?

Very nice, so it doesn't matter that it is dc instead of ac used on the input??
by tostino
Sep 12 2010 11:09am
Forum: E-Bike Technical
Topic: Best DC - DC converter for 36s lipo down to 12-14v?
Replies: 7
Views: 622

Re: Best DC - DC converter for 36s lipo down to 12-14v?

I like the idea of a laptop brick. I'd much rather keep it at full pack voltage. How would I know which ones are smps?
by tostino
Sep 12 2010 10:26am
Forum: E-Bike Technical
Topic: Best DC - DC converter for 36s lipo down to 12-14v?
Replies: 7
Views: 622

Best DC - DC converter for 36s lipo down to 12-14v?

Hey all, I am getting ready to build a few controllers for 36s lipo operation, and I was wondering... Is there anything I can run off of pack voltage that will give me a 12v supply??

I only need a few amps at 12v, i'm not looking for a ton of power... What are my options??
by tostino
Sep 11 2010 10:39pm
Forum: E-Bike Technical
Topic: Re-Winding this RC Motor for Racing ... cost effective?
Replies: 9
Views: 862

Re: Re-Winding this RC Motor for Racing ... cost effective?

Just like hub motors, there is really nothing at all stopping those motors from being run at higher voltages. That small motor may have actually not burned up if you ran it at a higher voltage with more of a gear down
by tostino
Sep 11 2010 9:08pm
Forum: General Discussion
Topic: ES browsing on smartphones and other mobile devices.
Replies: 7
Views: 566

Re: ES browsing on smartphones and other mobile devices.

From everything i've seen on the n900, it doesn't look all that great compared to a lot of the android devices out. I bought a Nexus one back in May, and love the phone. I got it without a contract, and paid $500 for it, which saves me $20/month on my bill. I agree with LFP though, who the hell woul...
by tostino
Sep 10 2010 10:43am
Forum: E-Bike Technical
Topic: Re-Winding this RC Motor for Racing ... cost effective?
Replies: 9
Views: 862

Re: Re-Winding this RC Motor for Racing ... cost effective?

I've never re-wound a motor, but from following some threads about it, I know that it's a labor intensive process that takes a lot of patience. That being said, if you do it correctly, you can probably expect to get a lot more power out of the motor, and have it maintain that power for a much longer...
by tostino
Sep 08 2010 8:55am
Forum: Motor Technology
Topic: The big FET drive challenge
Replies: 34
Views: 4223

Re: The big FET drive challenge

Jeremy, i've got a few 36 fet boards coming in pretty soon, and will post some pictures up. I suspect that it will have the same 6 drivers as the 24 fet board though, considering it is the same length as a 18 fet, but two rows.
by tostino
Sep 04 2010 7:47pm
Forum: Motor Technology
Topic: 12 kw rc motor
Replies: 1876
Views: 208984

Re: 12 kw rc motor

To get one quick, go to a hobby shop. They should have 3s controllers for some small motors that may work for a no load test on 12v or so. You could compare that to the no load you were getting with the sensored controller.
by tostino
Sep 04 2010 12:14pm
Forum: Motor Technology
Topic: 12 kw rc motor
Replies: 1876
Views: 208984

Re: 12 kw rc motor

Why don't you use a sensorless controller to try and spin it up? at least then you can see how much no load it should actually be using, and figure out if it is the halls that are causing it to be so high.
by tostino
Sep 01 2010 4:22pm
Forum: E-Bike Technical
Topic: Any problem driving a motor past no load speed?
Replies: 6
Views: 565

Re: Any problem driving a motor past no load speed?

John, the motor/controller that are going above no load will be regening, and creating a lot more drag than normal, but putting a little energy back into the battery (as the other motor takes more out of the battery to overcome the extra drag from regen).
by tostino
Aug 30 2010 12:02pm
Forum: Motor Technology
Topic: 12 kw rc motor
Replies: 1876
Views: 208984

Re: 12 kw rc motor

So the halls will connect to the controller :p. Look at the connector on the motor, and the one on the controller lol. That doesn't look like a direct plugin to me ;)
by tostino
Aug 26 2010 4:59pm
Forum: Motor Technology
Topic: 12 kw rc motor
Replies: 1876
Views: 208984

Re: 12 kw rc motor

From everything I understand, a lower KV is always easier for a controller to deal with than a higher KV (all else being equal). The lower KV motor will have higher winding resistance (more turns of smaller wire). The higher resistance is easier for the controller to deal with due to ohms law. I am ...
by tostino
Aug 25 2010 2:36pm
Forum: General Discussion
Topic: Bicycles banned in Black Hawk,Colorado (Riders are ticketed)
Replies: 16
Views: 1178

Re: Bicycles banned in Black Hawk,Colorado (Riders are ticke

Maybe we should, um, well... Hey Matt, can you regear your yellow trike for 115mph... I'll ride it through town slow until the police attmept to stop me... then leave em in the dust. Maybe we could get a high speed chase video posted of these idiots chasing down a bicyclist ? A&&*HOLE$! -Mike In a ...
by tostino
Aug 25 2010 10:28am
Forum: Motor Technology
Topic: 12 kw rc motor
Replies: 1876
Views: 208984

Re: 12 kw rc motor

pm_dawn wrote:Hi !

I would guess that the 50kv option would require an even more current capable controller.
But on the other hand might not require more than 100v. So that would maybe fit them fat trenchFETs that LFP are playing with a little better.


Regards
/Per
I think you have your idea of KV reversed :p.
by tostino
Aug 18 2010 11:52am
Forum: E-Bike General Discussion
Topic: $700 ebike build plan. Opinions?
Replies: 18
Views: 1188

Re: $700 ebike build plan. Opinions?

I would suggest this for a power supply for your charger: http://cgi.ebay.com/350W-13-5V-DC-Regul ... 780wt_1372

I am using that type of power supply to bulk charge my pack actually.