Re: Van Door Motor Problem
 

Ok...

People are starting to panic because it is week 5 now and such motor problems are not appreciated. Anyway. On to the point.

I have been looking around all over the place to find accurate van door specs. I have not found any. All of them are still the same old ones. Which are very wrong. The information in my first post is correct, it was actually measured. However, all we measured was theoretical power and free speed. So.. has anyone measured the actual stall torque, max efficiency, etc? I have lost my confidence in spec sheets.

Re: Van Door Motor Problem
 

I asked a question about this on the FIRST Q&A System and it was deleted... who knows what FIRST is doing.

Re: Van Door Motor Problem
 

So does anyone have the stall torque numbers for the new vandoor? Without it, there is no equation, and without the equation there is no redesign...

Re: Van Door Motor Problem
 

Apparently.. :sigh: I have found something that opens an even more frustrating question to this problem.

http://www2.usfirst.org/2005comp/Specs/Taigene_PSD.pdf

shows the spec for motor number:










edit: Overall pic of the thumbnail below is found here.
http://www.team237.com/gallery/Build...DR_2250_Medium

Re: Van Door Motor Problem
 

I did an RPM check on our kit van motor and it ran 78rpm

Re: Van Door Motor Problem
 

Did the sticker on the motor call out the same part number as the one I attached a thumbnail of, or the spec sheet motor? Cause they seem to be two different models, and/or part numbers. :(

Re: Van Door Motor Problem
 

Sorry I didn't check it, but I will tommorow and let you know

Re: Van Door Motor Problem
 

I opened ours up. This year’s has a ~104 tooth worm gear (as best as I can count without complete disassembly) and a worm with two threads for a 52:1 reduction. A prior year’s (with a 75rpm free speed) had a 65 tooth worm gear and a single thread worm. So the speed reduction is not due to the gearing.

Re: Van Door Motor Problem
 

Ok. What was the part number on the sticker of yours?

Re: Van Door Motor Problem
 

Tested ours, this years 51 rpm battery voltage 12.4, Last years 78 same battery voltage. Both will back drive with a wrench, BTW no speed difference on this years motor forward or backward. Sticker on the motor is similar to one further up in the post. Didn't check the numbers yet. Will do and and edit this post. Ours is the rev 02 and part number 16644829 the same as the pic posted by Elgin Clock post #19
Tom Cooper 1227

Re: Van Door Motor Problem
 

Wow, our motor number (16640238 rev 4) is different from both the spec sheet and the thumbnail above. Today, we did a whole lot of testing with textbooks and a multimeter on it, and we'll come up with a power curve for this given model, and post it up if anyone cares/is willing to believe our Überghetto experiments. What's really annoying is that there are 4 different models of the "same" motor mentioned in this thread only... What does FIRST have to say on this variety?

Re: Van Door Motor Problem
 

Yeah............ ours was going slower than previous years motors have. i am not sure about the RPM's though.

Re: Van Door Motor Problem
 

My reply is a bit off, but...

HOW do you attch the shrift of the Van door to a gear or spock

Re: Van Door Motor Problem
 

We filed/drilled a tiny 'dent' into the shaft and tightened a setscrew into it. There are othe ways, too.

I didn't time our motor, but our arm was geared based on the specsheet and performing exactly as expected (time/torque wise).

Re: Van Door Motor Problem
 

We got a full 80 rpm from ours on a charged battery.