Texturing Machine Control with AC Drive |
Written by AIA |
Texturising is a process by which required properties are imparted to Partially Oriented Yarn (POY), which then may go as direct production input to fabric manufacturing textile units. The texturising machine is a longitudinal multi-section machine. The length of the machine is decided by number of bobbins/spindles. The yarn passes from feed end to last stage winding end through a complicated path of separate driving shafts or sections. Through a mechanical arrangement, twist is imparted to yarn for strengthening. Compressed air, steam, & heat are used in the machine. The final yarn has superior properties to the input yarn. Depending on the grade of the feed yarn and quality of finish desired, different draw/stretch have to be maintained between various sections. This means the ratio of angular speeds of different driving shafts in a given machine have to be decided depending on line-speed, grade of incoming yarn and quality of finish to be imparted. A typical yarn path is shown below: To meet this basic requirement, two co-existing machine technologies are available:
In the machine driven by line shaft, a single AC induction motor drives the machine master shaft. Speeds of various other machine shafts in the machine are decided by operator based on pulley belt /gearing arrangement to achieve speed either higher or lower than that machine master. The limitations of this design are:
Use of ac drive for the main motor does take care of some aspects mentioned above. Owing to relative inflexibility of such line shaft machines, sectional machines have now gained popularity. Independent squirrel cage motors drive each driving shaft of the machine. AC drives are used for each of the motors. The requirements of sectional machine are described below:
Advantages of using sectional texturising machine with inverter control:
— S.Y. Shelar
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