Through analyzing the characteristic of the hollow rotor in ESG, it concludes that beryllium is the only material that can be used as the material of the hollow rotor.

As there were leak on contact place between shaft and rotor body in built up hollow rotor, dropping discharg gas speed of pump and efficiency applied of oil sealed sliding vane rotary vacuum pump.

The relevant methods for the complex spinning have been introduced, including rotor spinning, hollow spindle wrap spinning and ring spinning.