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Old 03-30-2009, 01:18 PM   #701 (permalink)
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Eric,

I agree with you 2 cents.

Cent one - Having room for expansion would be nice. Maybe some of the extra I/Os can be routed through an opto coupler IC, so that we don't have to worry about loosing isolation when adding I/O. If we can get a PC board layout done, I'll finance getting a bunch made, so we can all start having fun!

Cent two - I like the power wheel concept, but at least as presented there is a lot of gray area. Maybe on purpose because the author doesn't want to give away his design. Where/how do you mount the capacitors. From what I understand they work in unison with the freewheel diodes to absorb the inductive kickback. The shorter the electrical path between them the lower the voltage spikes, therefore, the safer the design. The mosfets are 200V rated, so any voltage spikes have to be well below 200.

I can see a Zilla like liquid cooled design pushing over 1000 amps peak through 20 Mosfets. Same control board as Paul is working on, just different power section.

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Old 03-30-2009, 01:29 PM   #702 (permalink)
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I vote for "The Electric Cougar".

I saw an on-sale seat cover at the auto parts store that had a Puma on it. I thought about buying it....
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Old 03-30-2009, 01:39 PM   #703 (permalink)
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I added the RC filter that was suggested by Fran on the EVTech list. I put it right at the input of the A/D converter like Roger suggested. Thanks, Roger! I'm going to try and measure the current in sync with the pwm signal. That should give a more consistent current.

The Electric Cougar... Hmm... It will have that futuristic cougar growl from your motor too... yes... That would be good...
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Old 03-30-2009, 04:03 PM   #704 (permalink)
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OK, after consulting Paul, new thread started. Name that controller contest!
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Old 03-30-2009, 04:11 PM   #705 (permalink)
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Is anyone good at drawing Anime?

How about art of a Hottie Little Miss Mosfet being frightened by an Electric Cougar?
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Old 03-30-2009, 05:02 PM   #706 (permalink)
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Hi.
New here, and I have read the entire thread. Amazing job by Paul and others.

Am I correct to assume this controller is strictly for a Series Motor ???
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Old 03-30-2009, 05:04 PM   #707 (permalink)
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Well, it works in a permanent magnet DC or series wound dc motor. My bike was a permanent magnet DC motor, and the car's motor is series wound DC. Any brushed DC motor is good.
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Old 03-30-2009, 05:23 PM   #708 (permalink)
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I have a Shunt Wound, I think. It's a Starter-Generator motor from an aircraft. It's rated 30VDC at 500 amps, and 8000 RPM. I would like to run around 100 volts through it.

I have heard it's not easy to find a controller for that, except, maybe Kelly. A DIY would be nice to try.
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Old 03-30-2009, 05:45 PM   #709 (permalink)
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Quote Roger: "If we can get a PC board layout done, I'll finance getting a bunch made, so we can all start having fun!"

This is getting real exciting, Roger. We will also need to add a component for communications. The simplest is an RS232 connection to handle an external interface for:
1. Debugging (printf statements, primitive but sometimes necessary)
2. Set and Get Variables for tuning the software behavior
3. Error Reporting
4. Data collection

Other choices could be an ethernet (RJ45) connection with web server (a little too sophisticated at this time for configuration and system upgrades).

USB, again a little too upscale for version 2 or even 3.

The main point here is we need to be able to configure parameters dynamically, aid in debugging, report errors and track data dynamically.
I think we could easily develop an RS232 character based protocol to accomplish all this. So, adding a DB9 connector and rs232 converter might be all we need.

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Old 03-30-2009, 06:59 PM   #710 (permalink)
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OK, I know this might be a bit wild, and I am typically for things being simpler, not MORE complicated, BUT.

What if you made the controller with an ethernet jack and could run that to a Scangauge? The ScanGauge gives you engine (motor) RPM, coolant temperature (motor temp!?) and lots of other cool information.

If you could create a data output from the DIY controller that would output info in a way the Scangauge could interpret, you would have a pre-made instant-read display! Plus, lots of us already have Scangauges!

Otherwise, a controller output to an MPGuino would be super-slick as well!

In the mean time, I will stick to my analog ammeter and voltmeter.

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