The paper presents simulation of the dynamics of a permanent magnet linear actuator with soft magnetic mover and relatively long stroke 60 mm. The simulation is carried out using decoupled approach where the magnetic field problem is solved separately from the electric circuit and mechanical motion problems. The obtained results are compared with experiment.

Modelling and characteristics of a newly developed bistable permanent magnet linear actuator are presented. The permanent magnets are fixed and the mover is soft magnetic one. The driving and the holding force can be varied practically independently as they are mainly formed through different air gaps. Static and dynamic characteristics of the actuator are obtained. The static force characteristics are obtained using finite element method for different permanent magnets, different combinations of the two air gaps and different coil currents. Dynamic characteristics are obtained for actuator with ferrite magnets. The results for static and dynamic characteristics are verified experimentally on a prototype of the actuator with ferrite magnets.

The dynamic characteristics of an ax symmetrical linear actuator with axially magnetized moving permanent magnet are obtained using combined field and circuit approach. The magnetic field of the actuator has been analyzed using the finite element method over a current-displacement sampling grid. Two field analyses are carried out for each point of the grid - one for the real system and one for the system where the permanent magnet is considered as a soft magnetic body. For each point of the grid, data for the total flux linkage, electromagnetic force and the coil inductance are extracted from the magnetic field analysis. These data are approximated by bicubic spline functions, which are employed in the solution of the system of ordinary differential equations of the electrical circuit and the mechanical motion. Results are obtained for the time variations of the coil current, mover displacement, mover velocity and electromagnetic force. The results for the current and displacement are verified experimentally

Optimization of an axisymmetric linear electromagnetic valve actuator I. Yatchev V. Gueorgiev K. Hinov Article information:To cite this document: I. Yatchev V. Gueorgiev K. Hinov, (2009),"Optimization of an axisymmetric linear electromagnetic valve actuator", COMPEL -The international journal for computation and mathematics in electrical and electronic engineering, Vol. 28 Iss 5 pp. 1249 -1256 Permanent link to this document: http://dx.If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -The purpose of this paper is to describe the optimization of a permanent magnet linear actuator with soft magnetic mover for electromagnetic valve. The optimization is carried out with respect to the minimal magnetomotive force ensuring required minimum electromagnetic force on the mover. Design/methodology/approach -Three optimization factors are employed. The value of the electromagnetic force and the objective function -the magnetomotive force -are obtained by caring out a full factorial design of experiment. For obtaining the objective function for each parameter combination, nonlinear equation is solved in order to minimize the flux that creates force in backward direction. Thus, several finite element analyses are carried out for each parameter combination. Then, response surface model is created and optimized. The obtained optimal solution is verified again by finite element analysis. Findings -The paper finds that optimal actuator has been obtained and its force-stroke characteristics and temperature distribution at steady-state mode are given. Originality/value -The valve is optimized by defining optimization function to be the solution of an equation canceling the flux in the nonactive part of the valve.

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