beepmotor

Stepper motor’s output torque is decreasing with the increasing of the speed, and it would drop dramatically when the speeds is higher, so its maximum operating speed is generally at 300 ~ 600RPM. AC servo motor has constant torque output, which can output rated torque in its rated speed (typically 2000RPM or 3000RPM). Above the rated speed, it is constant power output. Generally, stepper motors do not have overload capacity. However, ac servo motor has a strong overload. Take Sanyo AC servo system for example, It has the speed and torque overload abilities, its maximum torque is two to three times bigger than the rated torque .which can be used to overcome the inertia of the load moment of inertia at the start moment. Because there is no such overload for Stepper motor, you need to overcome this moment of inertia in the selection of induction motors .