The annulling of the sudden appearance of an unbalance in rotary machines by using active magnetic bearings

In: Engineering Review : Međunarodni časopis namijenjen publiciranju originalnih istraživanja s aspekta analize konstrukcija, materijala i novih tehnologija u području strojarstva, brodogradnje, temeljnih tehničkih znanosti, elektrotehnike, računarstva i građevinarstva; ISSN 1330-9587 (Print); ISSN 1849-0433 (Online); Volume 43; Issue 2 (online first); (2023)

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The application of magnetic bearings has become more frequent during the last 20 years and represents a significant aspect of improvements in the construction of machines with rotary motion. With the advancement of technology, the number of applications in which magnetic bearings have found their application is increasing. In this paper, it is shown how the effect of magnetic forces can annul the negative influence of unbalance, which suddenly appeared in a rotor supported in active magnetic bearings. Such cases may occur in operation due to breakage and rotor parts falling off (e.g., fan blades), which will lead to a sudden change in the mass balance of the rotor system and dislocation of the centre of mass in relation to the geometric centre of the rotor. In the paper, a mathematical model of the dynamic behaviour of a rigid rotor in active magnetic bearings was developed. The model is nonlinear and has five degrees of freedom and can only be solved numerically. The Newmark beta method and the Newton-Raphson method were used to solve the system of nonlinear differential equations. The results of the simulation showed the advantages of using active magnetic bearings for annulling sudden occurrences of unbalance in rotary machines.

Titel:	The annulling of the sudden appearance of an unbalance in rotary machines by using active magnetic bearings
Link:	Zum Datensatz bei OAister, evt. Volltext
Quelle:	Engineering Review : Međunarodni časopis namijenjen publiciranju originalnih istraživanja s aspekta analize konstrukcija, materijala i novih tehnologija u području strojarstva, brodogradnje, temeljnih tehničkih znanosti, elektrotehnike, računarstva i građevinarstva; ISSN 1330-9587 (Print); ISSN 1849-0433 (Online); Volume 43; Issue 2 (online first); (2023)
Veröffentlichung:	2023
Medientyp:	Elektronische Ressource
Schlagwort:	Index Terms: active magnetic bearings; rigid rotor; unbalance; vibrations; attractive magnetic force; displacement; control current text info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion
Sonstiges:	Nachgewiesen in: OAIster Added Details: Tomović, Aleksandar ; Damjanović, Milanko ; Tomović, Radoslav ; Jovanović, Janko Document Type: Electronic Resource Availability: Open access content. Open access content ; info:eu-repo/semantics/openAccess ; Engineering review uses the Creative Commons Attribution-NonCommercial-NoDerivatives (CC-BY-NC-ND) 4.0 International License. The authors are allowed to post a digital file of the published article, or the link to the published article (Enginering Review web page) may be made publicly available on websites or repositories, such as the Author’s personal website, preprint servers, university networks or primary employer’s institutional websites, third party institutional or subject-based repositories, and conference websites that feature presentations by the Author(s) based on the published article, under the condition that the article is posted in its unaltered Engineering Review form, exclusively for non-commercial purposes. Note: application/pdf ; English Contributing Source: HRCAK PORTAL ZNANSTVENIH CASOPISA REPUB ; From OAIster®, provided by the OCLC Cooperative.

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