Apparatus and method for measuring vibration characteristics

Patent metadata

Field	Value
Publication number	US-8960009-B2
Application number	US-201213456258-A
Country	US
Kind code	B2
Filing date	Apr 26, 2012
Priority date	Apr 28, 2011
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

A vibration characteristic measuring apparatus includes a magnetic bearing that generates magnetic force on the rotating body of a multi-stage centrifugal compressor, a displacement sensor that measures the vibration amplitude of the rotating body, a current amplifier that supplies a current to the magnetic bearing, and an excitation controller which outputs an excitation control signal for applying vibration to the rotating body and which measures the response characteristics of the vibration of the rotating body to the excitation control signal. The excitation controller outputs a rotating body control signal obtained by adding a vibration eliminating signal for eliminating unbalance vibration of the rotating body to the excitation control signal when measuring the response characteristics, and the current amplifier supplies a current that generates magnetic force in accordance with the rotating body control signal to the magnetic bearing.

First claim

What is claimed is:

1. An apparatus for measuring vibration characteristics, comprising:
a magnetic bearing that generates a magnetic force on a rotating body of a rotating machine in a non-contact manner;
a measuring device that measures a vibration when the rotating body is vibrated;
a current supplier that supplies a current to the magnetic bearing; and
an excitation controller which outputs an excitation control signal for controlling the magnetic bearing to apply vibrat…

Assignees

• Takahashi Naohiko
• Miura Haruo
• Yanagihara Kazutoshi
• Hitachi Ltd

Inventors

• Takahashi Naohiko
• Miura Haruo
• Yanagihara Kazutoshi

Classifications

• G01H1/003 Primary

  Physics · mapped topic

• F16C32/0444

  Mechanical Engineering · mapped topic