Go Back   EcoModder Forum > Search Forums
Reload this Page Search Results
Register Now
 Register Now
 

Showing results 1 to 22 of 22
Search took 0.10 seconds. Search: Posts Made By: faerietree
Forum: Fossil Fuel Free 11-08-2009, 09:30 AM
Replies: 3,480
Views: 915,192
Posted By Weisheimer
Paul, etischer's AC controller MOD thread on...

Paul,

etischer's AC controller MOD thread on DIYElectriCar is a great read
though he has taken an existing VFD and modified it. He covers a lot
of important issues and you will find it...
Forum: Fossil Fuel Free 11-02-2009, 04:34 PM
Replies: 3,480
Views: 915,192
Posted By MPaulHolmes
Paul and Sabrina's Cheap 3 Phase Inverter (AC Controller) with Field Oriented Control

Let's face it, AC is better than DC! An AC motor will last forever, since there are no brushes to wear out. You get regenerative braking for free, which both recharges the batteries, and saves the...
Forum: Open ReVolt: open source DC motor controller 01-07-2009, 01:29 AM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
I don't think it works that way. I've been...

I don't think it works that way. I've been thinking about this all day! It has given me a headache, and here's what I think I know:

The Torque-RPM curve is approximately a straight line for a DC...
Forum: Open ReVolt: open source DC motor controller 01-06-2009, 02:16 PM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
Great question! There's 3 pins. Gate, Source,...

Great question! There's 3 pins. Gate, Source, and Drain. Source is connected to ground. When gate is near 0 volts (compared to source, which is ground), the resistance from Drain to Source is...
Forum: Open ReVolt: open source DC motor controller 01-05-2009, 02:19 PM
Replies: 7,381
Views: 2,409,123
Posted By bennelson
EXACTLY! (Except that it costs more, you...

EXACTLY!

(Except that it costs more, you will need more chargers, or a single high-voltage charger...)

In the photo of the Neon, those are modular Anderson connectors. They can be put together...
Forum: Open ReVolt: open source DC motor controller 01-05-2009, 10:45 AM
Replies: 7,381
Views: 2,409,123
Posted By bennelson
You got it Paul. Also, keep in mind that...

You got it Paul.

Also, keep in mind that batteries, especially lead-acid, care a lot about how many AMPS are being pulled out of them. If you are pulling twice as many amps from a battery, you...
Forum: Open ReVolt: open source DC motor controller 01-04-2009, 11:27 PM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
Test done!

Here are the results of what I tried:

max rpm was completely unrelated to current limit. 24v max rpm was twice as fast as 12v. 36v was too fast to count, so I'm guessing that 36v max rpm was 3...
Forum: Open ReVolt: open source DC motor controller 01-04-2009, 09:42 PM
Replies: 7,381
Views: 2,409,123
Posted By Intrigued
Now's the Perfect Time!!!

Ooooh, Ooooh, Pick Me!!! No, Wait... I mean, you gotta try something!!! This is the perfect time to do some research on something I've been hearing about, but haven't seen any real proof yet.
...
Forum: Open ReVolt: open source DC motor controller 01-03-2009, 11:43 PM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
Current limiting implemented!

I thought I cooked the current sensor, but it still works! Bam! The specs say you can store the dang thing at 180 degC! That should have been a clue that it's sort of big, bad, and feisty!

So,...
Forum: Open ReVolt: open source DC motor controller 01-02-2009, 09:52 AM
Replies: 7,381
Views: 2,409,123
Posted By bennelson
Perhaps you could hold a fund-raiser or a virtual...

Perhaps you could hold a fund-raiser or a virtual bake sale?

You would have to enable cookies in your browser. :D
Forum: Open ReVolt: open source DC motor controller 01-01-2009, 02:43 AM
Replies: 7,381
Views: 2,409,123
Posted By Christ
You said that you have alot of space available on...

You said that you have alot of space available on the chip, right?

Get a binary switch, and write two diff programs to two cells on the same chip... like if you have a 512 chip, write 2x256 to it....
Forum: Open ReVolt: open source DC motor controller 01-01-2009, 01:54 AM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
I finally figured out how to use the STK500 as an...

I finally figured out how to use the STK500 as an in system programmer (ISP). So, I can add a 6 pin plug on the outside of the controller so that the microcontroller can be reprogrammed while...
Forum: Open ReVolt: open source DC motor controller 12-31-2008, 11:13 PM
Replies: 7,381
Views: 2,409,123
Posted By Christ
Well, you can do it with lexan too, but IIRC,...

Well, you can do it with lexan too, but IIRC, polycarbonate lets off fumes that you don't really want to be breathing... and it's very soft as far as polyplastic materials go, so it's quite easy to...
Forum: Open ReVolt: open source DC motor controller 12-31-2008, 11:00 PM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
Hey Christ! Ya, I just made it 5 seconds just...

Hey Christ! Ya, I just made it 5 seconds just for no reason at all. It can be anything. I think you're right. Maybe like 1 second might be plenty. That was an awesome idea about heating the...
Forum: Open ReVolt: open source DC motor controller 12-31-2008, 10:32 PM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
Controller mostly done

The controller is mostly assembled. I decided to put 5 mosfets and 5 diodes in it, so it should now be a 84v (well, anything safely under 100v) 100amp controller if it wasn't for the crappy bus bars...
Forum: Open ReVolt: open source DC motor controller 12-28-2008, 01:55 PM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
Capacitors added, and a few wires

The power board is nearing completion. I need to add the mosfets and diodes, but first I need to attach them to a heat sink, since there would be no room for screwing them in if I soldered them in...
Forum: Open ReVolt: open source DC motor controller 12-27-2008, 08:49 PM
Replies: 7,381
Views: 2,409,123
Posted By MetroMPG
Paul & Sabrina: you amaze me. (Well, anybody...

Paul & Sabrina: you amaze me. (Well, anybody who's not slow at projects, like me, amazes me.)

A thought after seeing the temp protection circuit: you might want to ramp up the current when...
Forum: Open ReVolt: open source DC motor controller 12-26-2008, 02:45 AM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
gentle throttle ramp-up added to software

New feature added! Gentle Ramp up of throttle. There's a problem if you accelerate too fast from 0 RPM. A motor has about 0.01 Ohms of internal resistance, or even as small as 0.001 Ohms for a...
Forum: Open ReVolt: open source DC motor controller 12-24-2008, 07:18 PM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
That hair dryer was right out of the Ben Nelson...

That hair dryer was right out of the Ben Nelson playbook. Remember the coffee can brakes? hehe!

I attached the (once again) revised version of the program, with the thermal shutdown included....
Forum: Open ReVolt: open source DC motor controller 12-23-2008, 11:55 AM
Replies: 7,381
Views: 2,409,123
Posted By MazdaMatt
Hehe... don't confuse "educated and working" with...

Hehe... don't confuse "educated and working" with "expert" :D

I will be proud to help this project in any way i can. You have accomplished an amazing amount without any embedded systems/electrical...
Forum: Open ReVolt: open source DC motor controller 12-23-2008, 11:47 AM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
ABSOLUTELY! I was reading about that too. It...

ABSOLUTELY! I was reading about that too. It would be a shame to have such a wonderful soft shutdown available and not even use it. I'm just being super simplistic right now for the bike version....
Forum: Open ReVolt: open source DC motor controller 12-22-2008, 03:41 PM
Replies: 7,381
Views: 2,409,123
Posted By MPaulHolmes
Program with step by step instructions

Hello! OK, so I have carefully tested the small controller, and watched the results on the oscilloscope. Finally, the software appears to be without any errors, and is much simpler and easier to...
Showing results 1 to 22 of 22

 
Forum Jump

Contact Us - EcoModder.com - Archive - Recent Posts - Top

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com