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.