Our drive technology enables efficient transportation of materials and high precision for sawing machines at GRAUTHOFF – and with small batch sizes, too.
In spite of the small batch sizes, it is necessary to ensure that the material transportation remains efficient and the sawing work precise. SEW-EURODRIVE supplies motors and frequency inverters; MOVITRAC® LTP-B series frequency inverters are used to drive the synchronous saw motors without an encoder.
GRAUTHOFF Türengruppe GmbH is a modern, owner-operated family business that has been manufacturing interior doors for more than 55 years. Around 700 staff work every day to guarantee consistently high quality levels and ensure that the product retains a contemporary appearance. In order to cope with the increasing demand for custom door widths, GRAUTHOFF commissioned Becker Sondermaschinenbau – a company specializing in the production of powerful precision tools in the field of special-purpose machinery – to produce a door casing saw for manufacturing door frames.
The new door casing saw allows infinitely variable positioning of the individual saw blades, making it ideal for producing very small batch sizes. The saws can be positioned using either a gear rack with SEW-EURODRIVE servomotors or with synchronous linear motors. The motors are controlled using MOVIDRIVE® series drive inverters, renowned for their bus positioning.
The saw blades are driven by eleven ultra-compact synchronous saw motors. They are controlled by MOVITRAC® LTP-B series frequency inverters, each of which boasts a nominal power of 7.5 kW. The MOVITRAC® LTP-B frequency inverter is available with IP20 and IP55 housing and offers an innovative VFC vector control to operate synchronous and asynchronous motors. A special highlight is the control of energy efficient synchronous motors without encoder.
Customer requirement
The requirements for the sawing machine included fast and low-cost commissioning, extremely simple operation and quick production changeovers, even for small batch sizes.
Our solution
Thanks to our expertise in the field of drive technology and our corresponding familiarity with the industry, we were able to work closely with Becker Sondermaschinenbau in order to develop a solution that was perfectly tailored to the customer's requirements – SEW‑EURODRIVE provides efficient transportation of materials and high precision.
"In the past, we often wished we had a simple, innovative solution when it came to commissioning special-purpose units and synchronous motors for drives. ...
... Now we use the MOVITRAC® LTP-B from SEW-EURODRIVE, whose auto-tune function automatically calculates the motor characteristics. This saves us a lot of time a money when it comes to commissioning."
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