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I wanted to know the operating characteristics of the old open-frame Pittman motors in my brass engines so I could replace them with can motors.
I wasted several months ordering and testing various motors that were too slow. A multimeter could measure voltage and current draw. But how to determine the RPMs?
Fortunately, other people know how to measure RPM, amperage, and torque, and posted it all on YouTube.
Here is my little test area. The “test stand” is a souvenir rail from 2 ft narrow gauge.
I installed Spectroid because it is easy to use and does not have ads - it does a lot of math and heavy lifting, I just read a number.
The analyzer automatically picks out the strongest frequency and displays the value
I paused the analyzer to freeze the image, took a screenshot to record the data
Multiply by 60 to convert cycles per second to RPM.
Notice the bit of blue masking tape on each motor shaft.
Screenshot of the spectrum analyzer. I circled the number it displays
The original post has an attachment with the results.
-- Doug -- Modeling the Norwottuck Railroad, returning trails to rails
This article first appeared on model-railroad-hobbyist.com
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