Apparatus for measuring an unbalance of a rotary member

摘要

An apparatus for measuring an unbalance of a rotary member, such as an electric motor armature, comprises a rotary member mounting arrangement for rotatably mounting the rotary member for a measurment operation. The mounting arrangement is capable of oscillating movement in a measurement direction. A drive belt for driving the rotary member in rotation bears against the rotor in substantially tangential relationship therewith or passes around the rotor over a small part of the periphery thereof. A measurement transducer detects forces or oscillations produced by the rotation of the rotary member in the measurement direction and outputs a corresponding signal for unbalance measurement. The drive direction of the belt drive in relation to the rotary member is normal to the measurement direction. The measurement direction may be inclined to facilitate fitting the rotary member into and removing it from the mounting arrangement of the apparatus.