With the advent of all-digital AC servo systems, AC servo motors are also increasingly used in digital control systems. In order to adapt to the development trend of digital control, most of the motion control systems use stepper motors or all-digital AC servo motors as the execution motors. Crane Cable is used for all kinds of cranes,including Overhead Crane,Gantry Crane,Jib Crane and etc as important crane electrical parts.The material is mainly PVC.This series of crane cable is comprised of multiple strands of finely wound oxygen-free copper wires. It meets the VDE0295Class 5 standard. Crane Cable,Qualified Crane Cable,Overhead Crane Cable EUROCRANE GLOBAL , https://www.cranes-group.com
Both servo and AC motors are similar in control mode (pulse train and direction signal), but there is a big difference in performance and application. Now compare the performance of the two.
Stepper motors and AC motors have different low-frequency characteristics. Different stepper motors are prone to low-frequency vibration at low speeds. The vibration frequency is related to load conditions and driver performance. It is generally believed that the vibration frequency is half of the motor's no-load take-off frequency. This kind of low frequency vibration, which is determined by the working principle of the stepper motor, is very unfavorable to the normal operation of the machine. When the stepper motor operates at a low speed, damping techniques are generally used to overcome the low-frequency vibration phenomena, such as adding a damper to the motor, or using a subdivision technique on the driver.
The AC servo motor operates very smoothly and does not vibrate even at low speeds. The AC servo system has a resonance suppression function that can cover the lack of mechanical rigidity, and the system has a frequency resolution function (FFT), which can detect the mechanical resonance point and facilitate system adjustment.
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