Question

Why use stepper motors for robot design? Electrical engineers believe that most robot movements are not long-distance high-speed (and therefore high-power), but typically include short stops and starts.

Answer 1

Stepper motor low-speed high-torque equipment, making transmission shorter which means higher reliability, higher efficiency, smaller clearance and lower cost. It is this characteristic that makes stepping ideal for robots, because most robot movements are short distances requiring high accelerations to reach low cycles. The power-to-weight ratio is lower than that of DC motors.

All ST robots have encoder feedback which is relative to software motor counting. In the event that no errors can be corrected, the system stops. Therefore, the integrity of the system is much higher.

Answer 2

But robots are positional devices designed to enter precise locations without errors. A robot that reports an error and stops further action in first gear or when the watchdog encoder is in first gear or in a collision.
In some low-speed stepper motors can resonate with the loss of synchronization and delay. Each stepper motor driver is independently microprocessor controlled, and the drive motor pseudo-sine is called microstepping. Microcode watches resonate and automatically switch phases and currents to compensate. In microstepping mode running on a silent drive, the motor can be seen in the video over the entire speed range.