Anaheim Automation carries both of those spur stepper and planetary gearmotors providing a variety of gear ratios, stack lengths and torque outputs. Because stepper motors are brushless, they have to have no maintenance for dress in and tear on brushes or commutators. Stepper motors have a organic frequency of operation. https://quickquinnnb.dgbloggers.com/40437111/how-to-test-a-stepper-motor-with-a-multimeter