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FLEXO Magazine : August 2010
Technologies & Techniques Mechanical transmissions in the drive train are totally eliminated in torque motors, reducing mechanical efficiency losses to an absolute minimum. Compared to geared motor solutions, the efficiency gain is typically in the range of 10 percent, while the gain is closer to 70 percent when hydraulic motors are replaced. For example, in the production of stretched film, the ap- plication of torque motors on chill rolls, pull rolls, stretch rolls and winders has resulted in a dramatic improvement in pro- duction quality. The more accurate speed control of the direct driven rolls results in faster start-ups during the changeover from one film product to another, because the likelihood of cracks in the web is minimized. Likewise, the stiff drive train configuration achieved with torque motors allows faster ramping up and down in cyclic applications, leading to shorter cycles and increased product output in the same time period. In many applications, the changeover from conventional drives to direct driven solutions has resulted in production increases of 25 to 30 percent. Other features on today ’s torque motors that make them more appealing for the machine designer include: • Absolute value or incremental encoders or resolvers for enhanced motion control. • Electronic nameplate for faster commissioning. • Horizontal or vertical mounting options. • Bearing options for axial thrust applications. • PTC resistors in each phase, in addition to standard KTY thermistors for optimum temp monitoring. The emerging science of mechatronics is also critical for direct drives, such as torque and linear motors, in the integration process because the electronic machine control protocols are so crucial in monitoring and executing the electromechanical motions. A keen knowledge of three dis- ciplines (mechanical, electrical and electronic engineering) is fundamental in determining the proper unit to suit the load. Mechatronics addresses such topics for the machine builder as proper encoder location, reaction versus dynamic force calculations and how best to integrate a high dynamic direct drive mechanically into the machine. Additionally, through various advanced computerized simulation techniques, mechatronic performance can be validated and troubleshooting on the design can be ac- complished before the first machine is ever built. Even in the field, before and after a retrofit or rebuild, the mechatronic services currently available can be used for product applica- tion determination, full performance analysis and controls compatibility. While the performance of a new motor or drive might be deemed satisfactory by mechatronic analysis, other mechanical, electrical or electronic components might be found lacking. It is precisely this comprehensive, integrated approach that is fast earning mechatronics its place in the overall scheme of machine development and utilization. n ABOUT THE AUTHOR: Harald Poesch is product marketing manager servomotors for Siemens Industry Inc. SYS TEC NORTH AMERICA, LLC. 108 State Street Suite 103 Greensboro NC 27408 Phone 336-273-4866 www.systecamerica.com email@example.com INNOVATIVE FLEXO MOUNTING SOLUTIONS WITH VIRTUAL IMAGE SYSTEM www.flexography.org august 2010 FLeXO 81 August2010_mech.indd 81 8/13/10 7:46 AM
Sustainable Summer 2010