User Report Mecatronix

25. June 2013

Mecatronix, a german manufacturer of mechatronic systems, is using Celeroton’s converter CC-75-500 to operate its newly developed Fermi-chopper. We are happy to introduce this collaboration to you.

Mecatronix has been developing and producing mechatronic systems since 1996, and offers consulting and engineering services. Besides various specialized mechatronic systems Mechatronix has already developed magnetically levitated spindles for wheel choppers operating at speeds up to 20 krpm (electrical frequencies up to 666 Hz). The most recent development is a Fermi-chopper with a speed of 40 krpm for neutron beams.

Chopper disks can have diameters up to 700 mm and therefore large moments of inertia. The disks run in a vacuum to eliminate friction losses.

According to Mr Henning Aust, project manager at Mecatronix, there were various relevant factors for the selection of a suitable converter to operate the fermi chopper:
„For this new development we were looking for a suitable converter. The use in our magnetically levitated spindle for neutron beam choppers is different to typical converter applications. The Fermi-chopper is operated at high speeds up to 40 krpm. Due to the magnetic bearings and the operation in a vacuum, load torques are low. Therefore, only low motor power is required while constant speed control is important.
We were looking for a converter which fulfills all those requirements. In addition, rotor losses must be kept very low because of thermal reasons. This was an additional reason to choose Celeroton’s converter CC-75-500.“

Before the cooperation with Celeroton, encoders were used for sensing the rotor angle. Celeroton’s technology now enables sensorless control of the Fermi-chopper, even at high rotational speeds. This investment especially pays off in combination with magnetic bearings.
„With Celeroton we found a supplier with experience in the field of high speed drive systems. Their converter suits our motors with low inductance very well. Its special functional principle promised an outstanding control quality and low rotor losses even at high rotational speeds, which has been confirmed. Furthermore, sensorless control allowed omitting the encoder which reduces required space and costs“, says Aust.

Mecatronix Chopper

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