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Novel moving-magnet electrodynamic feed units for small machine tools

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Abstract

Small feed motions in the mm and cm range today are mostly realised with miniaturised leadscrew motor systems, piezo stages and moving-coil actuators. A short survey on typical properties of those existing feed units for small machine tools is given first. A simple yet powerful complement or alternative to the above-mentioned small drives are single-phase linear direct drives with moving magnets. Especially motor designs with slotted stator winding offer high force densities and good dynamics. Combination of those short-stroke motors with ball or flexure guides and with embedded position or force control resp. leads to particular compact feed units. Such modules are currently being developed at Technische Universität Dresden for applications in future small machine tools and in automation. Two different prototypes of those feed modules are presented in this paper. With travel ranges of 11 and 14 mm, resp., peak forces of 39 and 112 N resp., linear force characteristics and speeds up to 1.6 m/s they feature attractive properties. A first module with ball-guided slide already contains an integrated low-cost position sensor and embedded state space position control. A second module with flexure-guided mover is currently being extended with latter embedded control components. Due to their high compactness, force density, dynamics and modularity, the developed feed units can widely be used in future small machine tools and in automation.

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Acknowledgments

The authors would like to thank the German Research Foundation (Deutsche Forschungsgemeinschaft—DFG) for funding of the presented work within the Priority Programme SPP 1476 “Small machine tools for small work pieces”.

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Authors and Affiliations

  1. Institute of Electromechanical and Electronic Design, Technische Universität Dresden, 01062, Dresden, Germany

    Thomas Bödrich, Fabian Ehle, Michael Süßenbecker & Jens Lienig

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  1. Thomas Bödrich
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  2. Fabian Ehle
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  3. Michael Süßenbecker
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  4. Jens Lienig
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Correspondence to Thomas Bödrich.

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Bödrich, T., Ehle, F., Süßenbecker, M. et al. Novel moving-magnet electrodynamic feed units for small machine tools. Prod. Eng. Res. Devel. 7, 497–501 (2013). https://doi.org/10.1007/s11740-013-0473-3

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  • DOI: https://doi.org/10.1007/s11740-013-0473-3

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