Large-Stroke Control of a Telescopic Two-Stage Linear Motor

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 293)


In this paper, a novel two-stage large-stroke proportional linear motor for fluid power valve technology is developed. It is found that the linear effective stroke is around 10 mm and the maximal output force reaches 15 N for the maximal excitation current of 1.0 A. In the design of the larger 2nd-stage linear motor, the hollow stator with embedded coil and permanent magnet covers and incorporates the smaller 1st-stage linear motor. It is also observed that both the stator and the armature of the 1st-stage linear motor are independently movable and form translational two-dimensional motion. Experiments further prove that such a two-stage large-stroke proportional linear motor can produce diverse modes of motion output even though the motions of the two armatures in the two-stage large-stroke proportional linear motor are translational rather than rotational. It is worth mentioning that the output force/stroke characteristic of the larger 2nd-stage linear motor is actually more nonlinear. However, such a non-linearity is not of great importance since the final precision linear force output control and the precision plunger position control are both accomplished by the armature of smaller 1st-stage linear motor. Finally, in this paper only open loop control scheme is required for the precision large-stroke plunger position control. In addition, the electro-magnetic software FLUX 2D is used as a tool to accomplish the design task and analysis of the two-stage linear motor.


Linear motor Hydraulics and pneumatics Proportional technique Fluid power Flux2D 



The financial supports of the National Science Council under grant number NSC 100-2221-E-224-022-MY2 is greatly appreciated.


  1. 1.
    Backe, W. (1993). Steuerung- und Schaltungstechnik II, Umdruck zur Vorlesung (4th ed.). Germany: RWTH Aachen.Google Scholar
  2. 2.
    Renn, J.-C., & Xu, Z.-L. (2003). State-space modeling and FEM design of moving-coil transducer for fluid-technical proportional valves. Journal of the CSME, 24(2), 119–125.Google Scholar
  3. 3.
    Renn, J.-C., & Tsai, C. (2002). Linearization of the force/stroke characteristic of switching solenoid using Fuzzy-logic-controller. Proceedings of Fifth JFPS International Symposium on Fluid Power (Vol. 1, pp. 193–198). Nara, Japan.Google Scholar
  4. 4.
    Gamble, J., & Tappe, P. (2008). A Novel bi-directional proportional hydraulic valve actuator, NCFP 108-11.3, (pp. 301–305).Google Scholar
  5. 5.
    Li, Q., Ding F., & Wang, C. (2005). Novel bidirectional linear actuator for electrohydraulic valves, IEEE Transactions on Magnetics, 41(6), 2199–2202.Google Scholar
  6. 6.
    Yamahata, C., Lacharme, F., Burri, Y., & Gijs, M. A. M. (2005). A ball valve micro pump in glass fabricated by powder blasting. Sensors and Actuators, 110(1), 1–7.CrossRefGoogle Scholar
  7. 7.
    Renn, J.-C., & Chen, H.-M. (2005). Design of a novel semi-active suspension for motorcycles with Fuzzy-sliding mode controller. Journal of the CSME, 26(3), 287–291.Google Scholar
  8. 8.
    Renn, J.-C., Chen, C.-Y., & Lu, C.-H. (2008). Gap control for a proportional floating vacuum pad, JMES. Proceedings of the Institution of Mechanical Engineers: Part C, 222(11), 2069–2072.Google Scholar
  9. 9.
    Renn, J.-C. & Liao, B.-J. (2010). A novel linear motor with movable integrated permanent magnets. Proceedings of the 7th International Fluid Power Conference, (Vol. 2, pp. 343–354). Aachen, Germany.Google Scholar

Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringNational Yunlin University of Science and TechnologyDouliouTaiwan, Republic of China

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