Why do we still need to develop stepper motors when we have servo motors?

The reason why it is necessary to develop stepper motors with servo motors is because stepper motors have some important technical data, such as maximum static torque, starting frequency, operating frequency, etc. The smaller the step angle, the greater the maximum static torque of the motor, and the higher the starting frequency and operating frequency. Therefore, the subdivision driving technology is emphasized in the operating mode, which improves the rotational torque and resolution of the stepper motor and completely eliminates low-frequency oscillation of the motor. So the performance of segmented drive drivers is superior to other types of drives.

The servo motor is precise, but expensive, and the stepper is cheap. The stepper motor has an advantage that servo motors do not have, which is absolute stillness. When the servo motor stops at a certain point, it is actually constantly adjusting in both forward and reverse directions. However, the angle is extremely small, and the stepper motor is completely stationary, relying on magnetic attraction to stay there. Certain special occasions require stepping. This also indicates that the mechanical characteristics of the stepper motor are very hard. When it comes to low speed and high power, and in economic situations, stepping is necessary. The stepper motor does not have an accelerator or reducer, and can return to the absolute position after one revolution without accumulating errors. The servo accelerator or reducer has backlash, or it is a large servo, which wastes performance.