bdtronic GmbH is one of the leading global manufacturers of plant systems and complete process solutions in the fields of dispensing, impregnation, hot riveting, low-pressure and atmospheric plasma systems technologies as well as the associated automation technology. To date, bdtronic has supplied more than 3,000 systems.

Reactive casting resins – a processing challenge

Polyurethanes, silicones, epoxy resins or thermally conductive pastes – all of these substances are single or multi-component reactive casting resins. They are used for the potting and sealing of electronic modules (control units, sensors etc.), for example in the automotive sector. In terms of dispensing, each material has different properties during processing - even substances with identical names from different manufacturers. Nevertheless, the quality after processing must be right: The material has to display the correct mixture ratio as well as being homogeneous, flowable and bubble-free to ensure the right application quantity and dispensing results.

It consists of a simco^® drive servo amplifier and a small servo motor from WITTENSTEIN's cyber^® dynamic line. The cyber^® dynamic 40 servo type motors with integrated planetary gearboxes drive the eccentric screw pumps such that even the tiniest quantities in the microliter range can be dispensed with precision. Precise control via the simco^® drive servo amplifier make it possible to individually adjust the dispensing quantities, to minimize the quantity tolerances and optimize the dispensing results in a reproducible manner.

With its cylindrical design, the servo motor fits perfectly into the dispensing systems. With a motor length of only 81 millimeters and a maximum torque of 12 Nm, it also offers a high torque density, depending on the gearbox attached – at a weight of only 700 to 900 grams. The small servo motors also dispense with the need for the additional deflector mechanism otherwise necessary for connecting the dispensing pumps. The simco drive servo amplifier is characterized by very high-resolution current regulation and fast current measurement. Even in the case of variable movement speeds of the portal shafts this enables even tiny quantities to be delivered with great accuracy.