Discussion on the coefficient K for the power margin of the mixing shaft

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This post was last edited by Danmo Rensheng on 2012-6-14 at 22:17. The specifications and relevant standards define the range for selecting the coefficient K of power margin for the mixing shaft, and they also stipulate that the speed deviation of the output shaft of the reducer should be within ±5% of the nominal speed. This person believes that these regulations are debatable, and hopes that fellow enthusiasts will engage in active discussions on this topic. For example, if a mixer has an shaft power of 75 KW, then according to the specified range for the power margin coefficient K, the power of the drive motor should be set at 90 KW. We know that the shaft power is proportional to the cube of the stirring speed. Based on a speed difference of 5%, the actual shaft power is 86.8 KW. Adding in the friction losses from the shaft seals and the losses from the transmission bearings on the frame, the actual operating power is likely to exceed 90 KW. Moreover, who can guarantee that the power factor of the stirrer they have built doesn’t have an error of 5%? Therefore, if selection is made according to the regulations, there will be many contradictions, which may also result in the mixer allowing an excessively high current. I hope sailors will engage in active discussions and offer various suggestions!