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Low-cost synchronous linear motor uses magnet-free track

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Siemens is launching the 1FN6 synchronous linear motor with magnet-free secondary section track that is claimed to offer the advantages of direct drives, including high force density, high dynamic response, good control features and outstanding precision. As the secondary section track has no permanent magnet, the 1FN6 is relatively inexpensive, especially for long-travel applications. The motor is therefore primarily intended for applications in handling and linked axes or in highly dynamic and precise feeding axes in water-jet and laser-beam cutting machines. It is suitable for use as an alternative to mechanical transmissions such as rack-and-pinion drives or ball screws, as well as an alternative to other types of motor such as asynchronous linear or reluctance motors. It is also useful for applications in which a magnet-free secondary section track is required.

In many machine tool applications, long distances must be traversed quickly and precisely. Due to the costs of permanent magnets, or in applications where it is difficult to protect the secondary section track against dirt, previous linear motor concepts could only be used to a limited extent. However, thanks to its modular design, the new motor can be adapted to meet special application requirements, as any number of secondary sections can be mounted next to each other. In addition, several primary sections can be operated on a secondary section track.

The first models of the 1FN6 linear motor available are designed as self-cooling versions with a maximum force of 880-7920N. These linear motors are designed for operation with the Sinamics S120 drive system. Configuration is carried out with the Tool Sizer, as is usual for the Sinamics drive family. Due to the connectors fitted to the front, the drive can be ready for use very quickly thanks to prefabricated power and signal cables.

For more information, visit www.siemens.de/linearmotors.

10 September 2008

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