A miniature short stroke linear actuator - Design and analysis

Publication Type:
Journal Article
Citation:
IEEE Transactions on Magnetics, 2008, 44 (4), pp. 497 - 504
Issue Date:
2008-04-01
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We report a newly developed miniature short stroke tubular linear permanent-magnet actuator for robotic applications. Compared to a rotary-to-linear mechanism, the linear actuator has the advantages of efficiency, thrust control, and compact size in generating linear motion. We optimized the electromagnetic force of the actuator analytically by selecting appropriate dimensions and then predicted the force produced by the winding currents by the finite-element method under the brushless dc excitation scheme. We analyzed the actuation performance by dynamic modeling of the actuator. We constructed and tested a prototype on a specially designed test bench to verify the design. Finally, we analyzed and measured the end effect on the magnetic force due to the limited length of the stator core and translator.Compared with the rotary-to-linear mechanism, linear actuators show advantages in terms of efficiency, thrust control, and system volume when linear motion is required. This paper presents the design and analysis of a newly developed miniature short stroke tubular linear permanent-magnet actuator for robotic applications. The electromagnetic force of the actuator was optimized analytically by selecting appropriate dimensions. The force produced by the winding currents was then predicted by the finite-element method under the brushless dc excitation scheme. The actuation performance was also analyzed through the dynamic modeling of the actuator. A prototype was constructed and tested on a specially designed test bench to verify the design. Moreover, the end effect on the magnetic force due to the limited length of the stator core and translator was analyzed and measured. © 2006 IEEE.
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