Three performance differences between servo motor and stepper motor
Different overload capabilities
Stepper motors generally do not have overload capability. The AC servo motor has a strong overload capability. Take the Shanyang AC servo system as an example, it has speed overload and torque overload capability. Its maximum torque is two to three times the rated torque and can be used to overcome the moment of inertia of the inertial load at the moment of starting. Because there is no such overload capability in the stepping motor, in order to overcome this moment of inertia during the selection, it is often necessary to select a motor with a large torque, and the machine does not need such a large torque during normal operation, and a torque appears. The phenomenon of waste.
Different running performance
The control of the stepping motor is open-loop control. If the starting frequency is too high or the load is too large, it may be lost or blocked. If the speed is too high during the stop, the overshoot may occur. Therefore, in order to ensure the control accuracy, it should be handled well. The problem of rising and falling speed. The AC servo drive system is closed-loop control. The drive can directly sample the feedback signal of the motor encoder. The internal position loop and speed loop are formed. Generally, the stepless motor is lost or overshooted, and the control performance is more reliable.
Different speed response performance
It takes 200 to 400 milliseconds for the stepper motor to accelerate from standstill to the operating speed (typically several hundred revolutions per minute). The AC servo system has better acceleration performance. Taking the Shanyang 400W AC servo motor as an example, it takes only a few milliseconds to accelerate from standstill to its rated speed of 3000RPM, which can be used in control situations requiring fast start and stop.
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