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MDA Technologies 2/2014

MDA Technologies 2/2014

Rubrizierungsebene Drive

Rubrizierungsebene Drive Technologies I 2. Ebene Drives for horizontal materials handling systems Thorben Steinmann The new Lenze Smart Motor combines the simplicity of a mainspowered motor and the technical advantages of electronic drive control. It is tailor-made for mains-operated and starter applications in horizontal materials-handling systems, and users benefit from a minimal motor variance. Roller, chain and belt conveyors are the classical types of conveyor in horizontal materials-handling systems and make use of relatively simple drive solutions. As a rule, the motors are permanently connected to the mains power supply, whereby Thorben Steinmann, Product the output torques and speeds are achieved Management Electrical Engineering, Lenze SE, Aerzen, Germany by means of appropriate gearboxes and gear transmission ratios. The equipment is controlled by means of contactors or starters, which in turn are switched on and off by a control unit. This approach has become established and works with a high degree of availability. In the last few years, however, developers have been focusing more on these motors, one of the main reasons being the increasing demands for energy efficiency combined with stricter international standards. The additional copper in the windings for IE2 or IE3 has made the more economical motors bigger and more expensive. Combining them with frequency inverters for freely adjustable speed control does result in better IE classification, but in many material-flow applications, this is equivalent to using a sledgehammer to crack a nut. This leads to an interesting que- 36 MDA Technologies 2/2014

Drive Technologies 01 The Smart Lenze Motor complements the simplicity of a motor network to the technical advantages of an electronic drive control stion: how can we apply sophisticated component and variant management to the task of reducing the large number of different drive axes in intralogistics? The high starting torques in materialshandling systems with subsequent compa- ratively low permanent torques create a difficulty in this respect, namely how to design drives so that they are not excessively overdimensioned. The effect of using drives that are bigger than we actually need becomes apparent as soon as we get the electricity bill. In this context, Lenze‘s new motor succeeds in solving one of the greatest challenges facing machine-builders as far as the flow of materials is concerned: the new drives combine maximum standardisation with a high degree of energy efficiency. What is the principle behind this new economic efficiency? 02 The speed of the Smart Motor can be individually adapted to the specific requirements of the application site with a smartphone Silicon instead of copper The essence of the innovation is to be found in a piece of intelligence that Lenze has integrated into the terminal boxes of threephase AC motors. The electronics can reliably cope with the high starting torques in materials-handling systems thanks to the overload capacity being four times that of the rated torque. One result of this innovation is that conveying systems are no longer overdimensioned in spite of the fast acceleration processes during continuous operation. This approach has several concrete advantages. Because this behaviour enables smaller designs, more compact motors with a lower power output can be selected. Another advantage of the lower rated power is that motors are closer to their optimum MDA Technologies 2/2014 37

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