ABSTRACT
The power requirements for any rotor spinning machine are divided into two parts: Mechanical power: This is required to overcome the frictional resistance inside the antifriction or sleeve bearings. Air resistance around the rotor: The power requirements, due to either bearing friction or air resistance, are dependent on the value of the rotor's eccentricity and the amount of air around the cup. The air resistance around the rotor causes an additional power requirement, but its value depends on the amount of air around the rotor. The rotor is divided into three parts: the disc, cylinder, and cone parts. The concept here is the aerodynamic resistance of the rotor. The power requirements of the rotor can be calculated using the Shirley, Moscow, and Zurich methods. The Moscow method does not consider the effect of the drive on the rotor's power and depends mainly on the air drag.
