COMPACT DIRECT-DRIVE ACTUATOR GENERATING A CONSTANT FORCE

摘要

The present disclosure relates to an electromagnetic actuator of the type producing a force due to the current that remains substantially constant over the entirety of its useful travel Y and that has a low force in the absence of current, including at least one stator structure, at least one electrical supply coil, and a moving member, the stator structure having, on the one hand, a central pole running perpendicular to the direction of the travel Y and having a width YC1 in the direction of the travel and terminating at its end in a width YC2 that is greater than or equal to the travel Y of the moving member, YC2 being greater than YC1, and, on the other hand, two lateral poles having widths YL1 in the direction of the travel and terminating at their end in a width YL2 greater than YL1.

主权项

1. An electromagnetic actuator operably producing a force due to the current that remains substantially constant over the entirety of its useful travel Y, the actuator comprising at least one stator structure, at least one electrical supply coil, and a moving member, the stator structure having, on the one hand, a central pole running perpendicular to the direction of the travel Y and having a width YC1 in the direction of the travel and terminating at its end in a width YC2 that is greater than or equal to the travel Y of the moving member, with YC2 being greater than YC1, and, on the other hand, two lateral poles having widths YL1 in the direction of the travel and terminating at their end in a width YL2 greater than YL1, with the lateral poles and the central pole being separated by a distance YG, with the moving member that is able to move relative to the stator structure comprising an armature supporting at least two adjacent thin permanent magnets each having a width YA, with the moving member and the stator structure delimiting an air gap E, with the coil having a width YB, the width YL2 of the lateral poles being is equal to (2YL1+2YB+YC1−2YG−YC2)/2 and less than the width YC2 of the central pole and the thin permanent magnets are adjacent.