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#Product Trends

Linear drives unplugged

During the Hannover Messe Industrie trade fair Swabian company TR-Electronic demonstrated completely wireless linear direct drives with position feedback for the first time. Key components are magnetostrictive linear encoders with drive components from Rexroth.

Modern handling and positioning systems fulfill high requirements on speed and precision, but also require a high level of preventive maintenance. Cables and cable carriers in particular are subject to constant wear, which increases considerably as the dynamic movement increases. The LP46 magnetostrictive linear encoders from Swabian manufacturer TR-Electronic GmbH offer a significant advantage. The sensor cable can be permanently installed as the actual measuring system is fixed, and only a small permanent magnet is moved along the closed measuring tube (see box). A complete linear drive system which is free from wear-prone cable connections has been created in cooperation with the drive specialists at Rexroth. The usual arrangement of the IndraDyn L ironless linear motors from Rexroth has also been inverted. The compact secondary part with permanent magnets is moved along the fixed primary part.

The omission of moving cable guides results in reduced friction losses and a reduction in the drive power required. Assembly and maintenance effort are considerably reduced, and the number of plug connections can also be reduced. The wireless linear drive system is much less sensitive to stress caused by shocks and vibrations.

Travel paths up to 450 mm long have already been implemented, and distances of up to one meter are possible. Repeat accuracies in the range of hundredths of a millimeter are possible with the LP 46 wear-resistant, contact-free magnetostrictive linear measuring systems from TR-Electronic. Reference runs are not required, as the system delivers absolute position values at all times.

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  • TR-Electronic GmbH

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