Patent ID: 6779400
Filing Date: 2004-08-24
Classification: G01M

Abstract:
An apparatus for determining an unbalance of a rotational body when said rotational body is mounted on said apparatus so as to be rotatable about a rotation axis, said apparatus comprising:a mounting plate extending along and defining a plate plane; a mounting fixture that is arranged on said mounting plate, and that is adapted to receive the rotational body mounted thereon so as to allow the rotational body to rotate about said rotation axis, wherein said rotation axis is oriented perpendicular to said plate plane; an outer frame arranged at least partially outwardly around said mounting plate; plural pairs of webs on said plate plane, said webs respectively connecting said mounting plate to said outer frame in an arrangement of said webs that is symmetrical relative to said rotation axis, wherein said webs are so configured and arranged so as to support said mounting plate relative to said outer frame, to transmit from said mounting plate to said outer frame all axially directed forces that are oriented along said rotation axis and that are not induced by the unbalance of the rotational body, and to allow said mounting plate to undergo translational vibration relative to said outer frame in said plate plane, wherein said translational vibration is induced in said mounting plate by the unbalance of the rotational body; and a first vibration transducer arrangement that is coupled to said outer frame and to said mounting plate, and that is so arranged and adapted to detect said translational vibration of said mounting plate relative to said outer frame in said plate plane.