| Advantages of hollow rotor: |
| 1. After the weight of the hollow rotor decreases, the axial torsion of conventional rotor will recede, break-out torque will lower, gear motor type will be relatively small, as well as customer's use cost will greatly lower with effect of environmental protection and energy saving obtained. |
| 2. Because the force of friction is closely related to weight, the force of friction of the rotor lowers and service life increases on a year-on-year basis in the operation process of the pump after the weight decreases in comparison to the equivalent solid rotor. |
| 3. Pump vibration obviously decreases in the process of quick start and high-speed operation. |
| 4. In the operation process of the equipment, noise decibel is greatly lowered without noise pollution. |
