How do I get STSPIN240 expansion board to drive small coreless motors?

Heidi Holmes · ‎2016-12-13

Posted on December 14, 2016 at 06:04

I cannot get these

https://www.seeedstudio.com/3.7V-50000RPM-Small-Coreless-Motor-716-p-1884.html

running on this

http://www.st.com/content/st_com/en/products/ecosystems/stm32-open-development-environment/stm32-nucleo-expansion-boards/stm32-ode-move-actuate-hw/x-nucleo-ihm12a1.html

. I have tried other dc motors and they run just fine. However, if I put a 10 ohm resistor on the output of the motor, the motors will drive.

I asked an ST tech and he said try changing the ref resistor which is currently at 200K. I changed it to 300K and nothing happened, the yellow leds are still dim and motor still will not drive. I am not sure how changing this REF resistor affects the logic/motors, but what value resistor should I be using or how else can I get the coreless motors to drive without resistors on its motor?

http://www.st.com/content/ccc/resource/technical/layouts_and_diagrams/schematic_pack/group0/b9/f2/e6/21/e6/ed/40/02/X-NUCLEO-IHM12A1%20schematics/files/x-nucleo-ihm12a1_schematics.pdf/jcr:content/translations/en.x-nucleo-ihm12a1_schematics.pdf

and

http://www.st.com/content/ccc/resource/technical/document/datasheet/group3/2f/ef/09/12/89/cd/41/c8/DM00293532/files/DM00293532.pdf/jcr:content/translations/en.DM00293532.pdf

.

#stspin240 #motor-driver