The third remarkable feature of stepper motors is the responsiveness. The open-loop control, which sends one-way commands to the motor, has a very high follow-up mechanism toward commands. While servo motors, which wait for feedback from the encoder, tend to have "delays" against commands, linear stepper motor actuator operate synchronously with pulse. 

Suitable Applications!
Other than an inching applications with frequent starting and stopping, stepper motors are suitable for positioning of image check processors that dislike vibrations, cam drives that would be difficult to adjust with servo motors, and low rigidity mechanisms such as a belt drive. Furthermore, cost is reduced significantly by replacing a ball screw drive to a belt drive.

Cost Reduction and the Advantage of Great Features
Besides cost reduction, stepper motors have many advantages in terms of performance. I hope this article provides an opportunity for those who have routinely selected servo motors to start considering stepper motors as their options. On the followong pages, detailed information of stepper motors, such as basic structure, system and example applications, is introduced for those who want to learn more about stepper motors.

 
Operation & Structure
A stepper motor rotates with a fixed step angle, just like the second hand of a clock. Highly accurate positioning can be performed with open-loop control thanks to the mechanical structure within the motor.

Accurate Positioning Achieved Only by Mechanical Elements and Accuracy
While having full control of rotation amount and speed, the simple structure of stepper motors (stepper motor gearbox or stepper motor closed loop )was achieved without using electrical components, such as an encoder, within the motor. For this reason, stepper motors are very robust and have high reliability with very few failures. 

Useful for Speed Control and Position Control
When pulses are input to a driver through a pulse generator, stepper motors perform the step angle according to the number of input pulses. The basic step angle of 5-phase stepper motors is 0.72˚ and 1.8° for 2-phase stepper motors. 

https://christ282.bcz.com/2019/11/06/types-of-speed-reducers-and-gear-stepper-motors/
https://jaystep01.weebly.com/blog/gear-motor-basics-functions-and-design-process