Integrated Motors and DrivesThe motor/drive systems in today’s paper mills may be decades old. Not only is the older equipment increasingly difficult and expensive to maintain, but it is not even theoretically capable of the energy efficiency and up-time performance that is possible with modern equipment that has been engineered as an integrated system.
Simplification, Standardization and Digitalization of Motors and Drives
Today, it is possible to purchase an engineered motor/drive system from Siemens that will take the demands of the extended product system into consideration. Not only can the desired torque and speed characteristics be reliably delivered for critical applications, but for applications that routinely experience a variable load, such as pumps, fans, crushers and grinders, up to 80% reduced energy losses may be obtained vs. pre-existing systems.
Constant torque applications can also benefit and may yield up to 40% energy consumption savings when operating at reduced speeds for significant portions of the duty cycle.
Integrated designs help create a complete solution for delivering predictable uptime and Technical Productivity.
Optimal designs include integration of:
- Upstream with “smart” power distribution and switchgear
- The automation system and onboard sensors
- Communications technology for remote condition monitoring
Siemens has developed its SIPAPER solution to provide the following types of drive control:
- Draw Control – for adjustable draw applications like dryer groups, guide rolls, paper rolls and spreader rolls
- Tension Control – for drives with tension feedback from outside sources, such as load cells. The tension controller uses the feedback to maintain constant tension on the paper, even when process conditions vary
- Indirect Tension Control – utilizes the process value of the motor load. The speed controller is over-driven while the indirect tension set-point (load set-point) remains constant