diff --git a/printed-stepper/README.md b/printed-stepper/README.md index 9bf957ec8597d121cff8a5c127450701470e6f87..2d1399b8dc212bb030c021f9cb0c82eeedbab0cf 100644 --- a/printed-stepper/README.md +++ b/printed-stepper/README.md @@ -1,3 +1,9 @@ +## Printed stepper motor +The motor below was printed using <a href='https://www.proto-pasta.com/pages/magnetic-iron-pla'>Proto Pasta's Iron-doped PLA</a>, which has a relative permeability of around 10. -<img src='printed-stepper.jpg' width=300px> \ No newline at end of file +<img src='printed-stepper.jpg' width=600px> + +This directory contains STLs and a Fusion design file. + +Be warned -- there are a few crucial design errors! First, the tooth size is too small given the reduced relative permeability of this filament, as compared to magnetic steel ($`\mu_r \approx 1000`$). Second, while the two magnetic poles have a full tooth offset, the two electrical phases don't have a half tooth offset. Duh! So, even if the tooth size we correct, the stepper wouldn't step in a predicatble direction. Someday I'll fix these and print another... \ No newline at end of file