Patent ID: 7412884

Claim:
An imbalance measuring device for a rotatable rotor having a rotary behavior, with a bearing device as a static fluid bearing for the rotor, a device to change the rotary behavior of the rotor, at least one measuring transducer which supplies signals and captures the effects of the imbalance of the rotor in a measuring process, a device to generate a reference signal, and an evaluation device for the signals which the measuring transducer supplies using the reference signal, wherein the bearing device has at least two open, fluid-supplied bearing shells to receive sections of the rotor periphery and at least one bearing plate which is assigned to an end surface of the rotor, rigidly supported and supplied with fluid, wherein a device to capture the rotary behavior of the rotor is provided, wherein the device to change the rotary behavior is decoupled from the rotor during the measuring process that takes place with rotary behavior which is constant or variable over time, and wherein the bearing shells are arranged exchangeably on the bearing device, and the bearing device has a fluid supply system, which makes possible a fluid-proof joining of the bearing shells which are to be exchanged, and have different fluid channels to the bearing device.