空心转子优势：
advantages of hollow rotor:
1.空心转子重量减轻后，与常规转子的轴向扭力减弱，启动扭矩降低，减速电机选型偏小，客户使用成本大-低，达到节能效果。
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 customers use cost will
greatly lower with effect of environmental protection&energy saving
obtained.
2.因摩擦力与重量有密切关联，因此与同等实心转子对比，重量减轻后，泵在运行过程中转子摩擦力减弱，使用寿命同比增大。
2. because the force of friction is closely related to
weight， the force of friction of the rotor lowers&service life increases on
a year-on-year basis in the operation process of the pump after the weight1
decreases in comparison to the equivalent solid rotor.
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