MDA Technologies 4/2013 (English)

MDA Technologies 4/2013 (English)1

2 MDA EDEVNTS 2013/14<br/>Deutsche Messe<br/>



5 ARGO HYTOS<br/>We keep you ahead of the competition<br/><br/>Fluid power technology for success<br/>




9 No Matter What You Move: We Drive It.<br/>SEW Eurodrive<br/> <br/>








17 Drive Technologies<br/> Engineering, Design and Application of Drives and Controls<br/> Drive Technologies: Linear and servo drives for test stands Wedging of magnetic coils in motors Multi-axis systems save space Electronics units with distributed tasks enable lean drive concepts Machine Elements: New sealed spherical roller bearings Polyurethane timing belts facilitate handling and maintenance More performance for planetary gear drives<br/> Image: SEW-Eurodrive, Bruchsal, Germany<br/>




21 Smooth and Clean<br/>Nord Drivesystems<br/>Getriebebau NORD<br/>

22 DRIVE TECHNOLOGIES<br/> A second life<br/> Wedging of magnetic coils in motors by Vogelsang effectively prevents damage<br/> Slot wedges in the stator winding of electric motors can work loose under magnetic stresses. This can result in damage to the motor. The wedges should be serviced regular and replaced when necessary.<br/> agnetic slot wedges in the stator winding optimise the field distribution in the airgap in the core tooth section, and enable the machine to output more power. Especially in the case of high voltage motors, magnetic slot wedges are used in the stator winding. However the wedges can also cause problems - although action can be taken to prevent them. Regular inspections of high voltage machines can detect<br/> dings. Magnetic slot wedges stop the stator coil moving in its slot, and protect the surface of the winding from external influences. The stator coil, which is subject to load due to the fact that it is a current carrying conductor in a magnetic field, is secured in its slot with a wedge and filling/isolation material. While Isoval or other non-magnetic and non-conducting materials are used on small<br/> Low cost manufacture can be a cause of insufficient wedging<br/> the first signs of wedge loosening. Bochum, Germany, maintenance specialist Vogelsang Elektromotoren recommends visual inspection of the interior of electric motors, as well as regular measurement of the isolation system. If we consider the original purpose of slot wedges it is clear that the magnetic properties of the wedge are a blessing and a curse for motors and generators, since the magnetic loads they are subject to can loosen them, thus seriously damaging the winmachines, in the case of larger machines and generators Magnoval is often used, i.e. magnetic wedges. One motor manufacturer also uses a bi-component material which is driven into the slot as a slot wedge. Since a lot of emphasis is placed on low cost manufacture of new machines, it is no surprise that manufacturers try to save money when wedging the stator winding. This means that the wedges are not always securely or durably secured to the slot. Certain motor manufacturers have more problems in this regard than others.<br/> MDA Technologies 4/2013<br/>














36 MACHINE ELEMENTS<br/> Essential, as ever<br/> Mechanical safety couplings by Mayr provide reliable protection against overloading<br/> Hermann Bestle<br/> The development of torque limiting safety couplings has been characterised over the last 50 years by technical developments in the area of electrical drives. Requirements for increased performance, dynamics and speed changed their construction and led to a huge variety of offerings. Safety couplings by Mayr are of great importance in protecting modern drive axles against costly damage due to overloading.<br/> n the early days of electric drive technology, the drive speed and torque were transmitted using flat drive belts. This friction transmission system meant that the torque was kept within bounds. If any part of the system locked up, the belt would slip, thus preventing the uncontrolled torque loading. And at that time, production speeds were lower and systems were larger. The era of modern torque limiting safety couplings started in 1958. The German patent office granted the first patent for a safety clutch that year to Mayr Antriebstechnik in Mauerstetten. The first formfitting EAS couplings were introduced in 1963 (Image 1). These retaining element couplings were subject to<br/> backlash. The torque was delivered to the output side by grooves and pawls, and the shaft and hub were usually spring-keyed together. As electrical drive technology developed towards high speeds and dynamic performance, the requirement for backlashfree torque transmission became ever more important. As a manufacturer of mechanical safety couplings, Mayr Antriebstechnik was ready to meet the challenge. The first backlash-free safety coupling was presented in 1980. The torque was transmitted by a spring steel plate, bolted to the hub and drive flange. The spring key coupling the shaft to the hub was replaced by backlashfree clamping elements.<br/> Torque delivery with balls<br/> In 1987 EAS-NC introduced its patented, permanently backlash-free transmission concept, which is still used in many mechanical safety couplings. The current high performance EAS Compact and EAS Smartic ranges also work on this principle (Image 2). The torque is transmitted by balls, which engage with concavities in the hub and drive flange at the same time. Plate springs compress the balls via a collar. The spring force is proportional to the maximum torque delivery. This system remains backlashfree even when the concavities are worn. In the EAS NC line, Mayr Antriebstechnik also employs plate springs with a falling characteristic curve. With conventional plate<br/> springs, when the system is overloaded the torque increases at first due to the increased spring tension when the coupling slips, and does so until the retaining elements are no longer engaged. Only then does the torque drop to a residual value which cannot damage the linkage. If one uses springs with a falling characteristics curve, the spring tension drops off immediately, since increasing the compression of the plate springs reduces the force they exert. Along with these safety couplings, Mayr brought other ranges to market in the early Eighties. The standard safety couplings could not solve certain problems faced by machinery fabricators. For example, the need to adapt the overloading torque value to the realtime requirements of the production process. It should also be possible to switch parts of the system on and off synchronously, under process control. These requirements led to the development of switchable and adjustable, formfitting safety couplings.<br/> Limiting high torques without fuse-type failure<br/> The EAS element couplings and EAS elements were introduced at the same time. It was thus possible for the first time to limit high torques without part failure by using a variable number and configuration of elements. These are used in mining, rolling mills, tunnel boring equipment, large extruders and shredders and provide a consi-<br/> Hermann Bestle, head of public relations, Mayr Antriebstechnik, Mauerstetten, Germany<br/> MDA Technologies 4/2013<br/>






42 MACHINE ELEMENTS<br/> High energy savings in all industrial processes<br/> The competitivity of the manufacturer largely depends on his understanding of the various technologies he employs. A dogmatic approach is not suitable to the challenges of the future. In nearly all industrial processes, using for instance hydraulic pumps, there is vast potential for energy savings. The combination of electromechanical equipment with hydraulics can reduce COemissions by using frequency controlled 2 hydraulic drives, while increasing productivity. Modern hydraulic drive systems are energy efficient, highly dynamic and precise. They are also much more vibration free and less noisier than just a few years ago. And their compact size factor makes it possible to install modern drive modules in more restricted spaces, thus reducing the oil volumes. The concrete potential for savings can only be realised y carefully considering the individual application. This is the challenge for manufacturers. By optimally combining pneumatics, hydraulics and electromechanics, they can find the best solution for every situation.<br/> AC30V drive for pump, blower and general applications<br/> an electromechanical spindle drive and couplable feeder drives, while the speed settings were delivered by mechanical gearsets. The feed was driven mechanically off the central main drive. DC drives were used for variable speed applications. The process was controlled by manual settings, cam drives and hydraulic tracer controls. Increasing automation required electrically controlled, variable speed drive solutions, an area were electrohydraulic solutions could be used due to the availability of proportional and servo valve technology. Electrohydraulic drives offered an economic alternative to electromechanical DC and AC drives, and were widely used in feeder applications, so long as the low load tolerance of long-stroke cylinders was not an issue. Modern machine tools use electrohydraulic feed drives in only rare cases. This is due to the development of AC servomotors with high performance servo controllers, which make it possible to control the spindle-driven feed precisely and dynamically. The high mechanical rigidity of the spindle facilitates precise positioning. Electrohydraulic feed drives and feeders are used today in machine tool applications in which linear drives with high loads and accelerations are required. Examples are slotters for large gear wheels and broaching machines. In broaching machines in particular, the reduced drive rigidity is of advantage to the resistance of the tool, since the cut has a softer start. However, one must not forget the many other drive requirements of machine tools. The tool and workpiece require handling and clamping drives, which combine with guard drives in a completely automated system. New developments in<br/> drive technology are designed to satisfy increasing regulatory requirements for operational safety, and provide safe and ergonomic operation of modern production equipment.<br/> Overall optimisation of production equipment<br/> A global and yet individual view of the application is essential. Mechatronic drive modules offer the machine manufacturer a wide choice for the best solution to his application (Image 4). The machine manufacturer can thus benefit from the experience of the drive specialist and concentrate on optimising the machine itself. He can therefore focus on implementing the EU energy and resource consumption directives, which allows for overall optimisation of the machine. The prerequisite for this is an expert evaluation of the various technologies involved. Even though the various technologies increasingly overlap in their applications, the optimal solution still requires assessment of the specific benefits and weaknesses of competing drive concepts. Not only functional but also economical aspects must be considered, if the end user is to have an optimal solution.<br/> 04 Complete mechatronic<br/> packages are offered along with electric cylinders, to combine a variety of technologies into a system solution<br/> About<br/> Company name: Parker Hannifin Headquarter: Cleveland, Ohio, USA Revenue: Approx. US-$ 12 bn. Employees: about 52,000 Products: Cylinders, motors, drives, fittings, filters, pumps<br/> MDA Technologies 4/2013<br/>

















59 Efficiency - as if carved in stone.<br/>Everything else matches your requirements exactly.<br/><br/>HIGH Efficiency.<br/><br/>SOLUTIONS FOR A WORLD UNDER PRESSURE.<br/><br/>HAWE Hydraulik<br/>

60 SCHAEFFLER<br/>Innovation Starts in Our Minds<br/><br/><br/>

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