This paper presents a realistic comparison of several electromagnetic architectures for high force density actuators. Four equivalent architectures are chosen and computed with a two-dimensional finite element model. For each architecture, size is optimised in order to maximise the force-volume ratio. This optimisation step is performed with a fixed mechanical airgap. A thermal model is then used to calculate the current density in the coils. Results show that globalcoil architecture performance increases more sharply than other architectures; a scaling effect is thereby introduced for global-coil architectures. A global-coil multi-airgap actuator is presented to illustrate the theoretical results.
Abstract-In this paper, a new multi-rod linear actuator is presented. This actuator has been developed for high thrust density and wide mechanical bandpass applications. The multi-air-gap concept will first be illustrated and explained. Its advantages will be highlighted thanks to finite-element method optimizations. Next, the multi-rod prototype technology will be discussed. Lastly, experimental measurements for prototype forces will be provided.Index Terms-High mechanical bandpass, linear permanentmagnet motor.
Résumé-Cet article met en parallèle les deux grandes familles d'actionneurs électriques linéaires, ceux à entraînement direct (la force motrice est directement produite par les champs magnétiques) et ceux indirects dans lesquels c'est en général un moteur électrique tournant qui convertit l'énergie électrique en énergie mécanique. C'est alors un système mécanique ou hydraulique qui effectue la transformation en mouvement linéaire. La comparaison porte principalement sur deux catégories de performances, celles d'encombrement et celles, dynamiques, d'accélération. Les effets d'échelles sur ces caractéristiques font l'objet d'une attention particulière. Le cas des actionneurs linéaires directs est détaillé, les auteurs montrent notamment la diversité des principes de conversion électromagnétiques et des architectures. Quelques calculs simplifiés montrent les grandes lignes de leur dimensionnement ainsi que les ordres de grandeurs de leurs performances.
Abstract-In this paper, a new multi-rod linear actuator is presented. This actuator has been developed for high thrust density and wide mechanical bandpass applications. The multi-air-gap concept will first be illustrated and explained. Its advantages will be highlighted thanks to finite-element method optimizations. Next, the multi-rod prototype technology will be discussed. Lastly, experimental measurements for prototype forces will be provided.Index Terms-High mechanical bandpass, linear permanentmagnet motor.
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