**6. References**


[8] Azukizawa T, Yamamoto S, Makino H (2009) Analysis of Dynamic Behavior of a Magnetic Top Considering Aerodynamic Drag Force. LDIA2009

**Chapter 7** 

© 2012 Kozanecka, licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

© 2012 Kozanecka, licensee InTech. This is a paper distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

**Theoretical and Experimental Investigations** 

The conversion of energy in rotating machines is accompanied by phenomena that cause the additional dissipation of energy, affect technological processes, lower the endurance of machine elements and sometimes cause damages. Among these phenomena there are synchronous vibrations and self-excited lateral vibrations of the rotor and momentary

Among the machines used in power engineering, rotary machines (compressors, pumps, blowers and turbines) are the ones used most often. Recent studies have put emphasis on the dynamics of rotating machines. This allows us to minimise the vibrations of the machine both during the period of its construction and at the time of its operation. The growing demand for reliability of rotating systems (i.e. API code) makes it necessary to specify their vibration parameters (critical frequencies, separation margins, amplitude of synchronous

The search for new solutions of bearing systems in modern rotary machines that have to satisfy special performance demands has resulted in interest in rotor active magnetic suspension systems. The application of magnetic bearings as a system of shaft suspensions gives supplementary, unparalleled in classical solutions, diagnostic capabilities [10-14]. There are, however, also high requirements concerning the control system of the shaft position. New solutions in bearing systems have been more and more frequently applied in modern rotating machines. These include magnetic bearings that enable the active control of

**of Dynamics of the Flexible Rotor with** 

**an Additional Active Magnetic Bearing** 

pitches of amplitude of the rotor-bearings-foundation system vibrations.

A machine with a rotor supported in magnetic bearings allows for:

Additional information is available at the end of the chapter

Dorota Kozanecka

**1. Introduction** 

rotor vibrations.

http://dx.doi.org/10.5772/51113

vibrations, permissible unbalance, etc.).
