By training, I'm an EE. It's been years since I had the one Dynamics course in school. But somehow I got suckered into measuring the torque of the small shaded pole motors that we use in our appliances. I also managed to inherit some equipment from the previous holder of my position.
So, what I have is a hysteresis brake. It can load a motor with up to 40 oz-in. of torque load. Apparently, my predecessor used to load motors with this brake, measure the input power (electrical, for efficiency calculation)and the speed (for power out, mechanical) at a given torque load. When the motor was loaded so much that it stalled, he called that the stall torque. He left no notes as to why he was measuring this way or any other information, just lots of measurement logs.
My question is: what is the correct method to measure torque on a small motor? In searching the web, I've seen torque transducers that bolt on between the brake and the motor. What's the correct way to use such a transducer? Any and all info on the subject would be greatly appreciated.