stepper motor strength test

[Richard CSL]

Is there any way to test how strong a stepper motor is as I have some pan motors which are slipping and making a grating noise as they slip.

I have several old motors,  but wanted to know if there was a way to test for condition.

over time motors can get hot as bearings fail, and as a result the laminate core seems to lose magnetic power.

I know there are resistance tests, but this does not reveal the actual power of the motor, only the windings.

 

Edited August 8 by Richard CSL

[DrV]

I can think of a comparative test you could rig up fairly easily. It would allow you to compare holding torque between a known good motor and a test item: Mount the motor on a solid surface and fix a wheel onto the spinde. Wrap a string around the wheel and take the free end to a spring balance. Pass a steady fixed current through the windings near the maximum permitted value. This should hold the spindle rigidly. Now pull on the spring balance, making sure to keep the string in the same plane as the wheel, at right angles to the spindle, and record the maximum reading before the motor slips.

If you measure the diameter of the wheel you can calculate the absolute torque but if you only need to compare good with bad you just compare the values.