Answer: A stepper motor that's turned by a load produces a back EMF voltage on the motive force. Bigger speeds will deliver bigger voltage concentrations. Should the rotational velocity will get excessively large, this voltage may possibly harm the driver. This is very perilous In case the motor is back-pushed https://bladebill.blogocial.com/the-science-of-flux-linkage-in-a-stepper-motor-75941647