The Coil-less Linear Motor
Design of a Long-Stroke Reluctance Actuator using Reluctance Tuning as an Alternative to Coils
O.J.C. Rommelse (TU Delft - Mechanical Engineering)
S.H. Hossein Nia Kani – Mentor (TU Delft - Mechanical Engineering)
Y.J.T. Niessink – Mentor (TU Delft - Mechanical Engineering)
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Abstract
This thesis investigates a novel long-stroke linear actuator concept aimed at combining high force generation, low heat dissipation, and extended travel range for precision motion applications. As modern high-tech systems increasingly demand higher accuracy, throughput, and thermal stability, there is a growing need for alternative actuation principles that overcome the limitations of conventional technologies.
The research focuses on the development of a new magnetic actuator architecture that enables motion generation through controlled variation of magnetic interactions rather than conventional electromagnetic force generation. Multiple actuator concepts were analysed using analytical models and finite element simulations, after which the most promising design was optimized and experimentally validated.
A prototype actuator was designed, manufactured, and tested through a series of experiments ranging from single-module validation to a complete long-stroke demonstrator. The results demonstrate the feasibility of the proposed concept and show that long-stroke motion can be achieved while maintaining very low steady-state power dissipation. Although further improvements are possible in areas such as force density and motion smoothness, the work successfully establishes a proof of principle and provides a foundation for future development of efficient precision motion systems.