Reluctance transducer
AssigneeNederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO
InventorsRoger Franciscus Mattheus Maria Hamelinck, Christian Werner
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Abstract
A reluctance transducer includes a soft ferromagnetic yoke and a soft ferromagnetic core element, which is movable relative to the yoke. Two permanent magnets bear the core element. The permanent magnets are arranged relative to each other and to the yoke so that the reluctance transducer has a good linear relationship between displacement and force. The reluctance transducer can be applied as stiffness compensating element. The reluctance transducer can include an electrical winding to allow its application as a magnetic bearing, an actuator or as a displacement, velocity or acceleration sensor with improved intrinsic linearity.
Claims13
A reluctance transducer comprising:
- a soft ferromagnetic yoke having a first end and a second end, the first end and the second end defining an intermediate space,
- a soft ferromagnetic core element partly filling the intermediate space, the soft ferromagnetic core element and the yoke being movable relative to each other in a direction between the first end of the yoke and the second end of the yoke, and
- a first permanent magnet and a second permanent magnet arranged relative to each other such that the first permanent magnet and the second permanent magnet exert opposite forces on the soft ferromagnetic core element;
- wherein a first pole of the first permanent magnet is mechanically and magnetically coupled by an intermediate soft ferromagnetic element to an equivalent first pole of the second permanent magnet,
- wherein a second pole of the first permanent magnet is magnetically insulated from an equivalent second pole of the second permanent magnet, and
- wherein the soft ferromagnetic core element is formed as a lever pivoting with respect to an elastic hinge and moving an actuator element or a sensor element.
Dependencies are inferred from the claim text.