Thursday, July 24, 2008

The motor

I found a golf cart motor on Craigslist for $25. The guy gave me the contactor/resistor controller with it too. The motor is a GE 5BC48JB152. 3300RPM, 2HP, 36V, 52A, series wound motor. I was pleasantly surprised that it has a front end bell and bearing, not like all current golf cart motors.
The first thing I did was spin it up on 12V just to make sure it worked. Sure enough it did! Next I opened it up. I wanted to learn about how these motors are built. It seemed quite similar to the large 9" ADC in my Tercell, just smaller. The brushes seemed to be in good shape, but there was a ton of brush dust all over inside the case, it made a big mess of my workbench. I carefully dismantled everything and I had a good excuse to go buy a gear puller set. Now that I think about it, I should have got a bearing puller set instead! But I got the bearings off either way. I decided I should replace the bearings while I have it all apart. One bearing was a little corroded and they didnt spin as freely as I thought they should. Add $40 to the total cost so far.
After cleaning brush dust from between my teeth and everything else, the inside of the motor was starting to look good enough to me. Inspired by Jim Hustead, I wanted to make the outside look fun. First I used electrolysis to clean the rust off of the end bells and I primed everything. After much though (I'm indecisive) I picked green and black for the colors (thats what I had on the shelf).
I'm pleased with the paint job, being my first motor work over. I replaced the nuts on the terminals with shiny brass ones to complete the look. I also polished up the output shaft a bit, it has some corrosion on it. (The photo does not show the new nuts).
Is it overboard? Maybe, but I had some time and wanted the experience.

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