Comprehensive updating of the multimotor electric drive for type PN-500 machines

Abstract

The overall result of updating consists of the following: 1. Use of electric shafts in the takeup-winding part of the machine allowed optimally positioning them on the spindle rail in accordance with the new process scheme for setting up the machine. 2. Due to the increase in the number of spindles in the machine, its output increased by almost two times. 3. The costs for servicing the spindles decreased due to the lack of drive band and tension mechanisms, absence of a spindle power brake, and fast replacement of a defective spindle with a serviceable spindle. 4. The overall noise level of the operating machine was reduced significantly. 5. The stability of the synchronous rotational speed of synchronous hysteresis electric spindles ensured stability of twisting at each work place and preserved product quality. 6. Use of synchronous hysteresis motors for the first time in world practice, in addition to ensuring synchronicity of rotation, allowed: — reducing the starting current ratio in comparison to similar developments based on asynchronous motors by 2.5–3 times, which decreases the installed power of electrical equipment and heating of the motors in the startup mode, thus increasing the lifetime; — optimally combining the load power and installed power by decreasing power consumption at one work site by 6.25 times in comparison to the mechanical spindle drive; — using new types of Novtex converters with spindle magnetization units additionally reduces power consumption by 1.45 times; total power consumption is more than 9 times less than for the machine with spindles with mechanical drive. 7. The lifetime of the spindles increased. After working for 10 years, a maximum of 10% of the spindles failed, and more than half of them failed due to bearing wear. The work done by the teams at the companies mentioned can thus serve as an example for updating plants of similar nature.