Full Title Development and Verification of Rotor Dynamic Calculation Procedures for Electromagnetic and Auxiliary Bearings Using IPM Test Rigs Tech Area / Field

FIR-REA: Fission Reactors / Reactor Concept

MAN-TRI: Manufacturing Technology / Tribology

Brief Description of Technology
Investigations of rotor dynamics in electromagnetic or catcher bearings are performed by many foreign firms: General Atomics (USA), Framatome (France), Thermodyn (France), and IPM (Germany).

The majority of the materials published do not contain a sufficient data base (initial data and test results) required to verify the calculation results. With regards to the catcher bearings, frequently only a number of successful "landings" is recorded without giving information on perturbing forces and shaft coordinates.

The difference of the newly developed procedure resides in the fact that during its development the following factors are supposed to be taken into account:
- tangential forces influencing the rotor stability;
- complex tribological characteristics of materials;
- rotor flexibility;
- influence of damping characteristics of a bearing;
- availability of movable element between a rotor and stator.

The development and verification of this procedure will allow:
- the specification of the description of a control object, which will be used at the choice of EMB control laws;
- the determination of possible mechanisms of buildup of forces acting on catcher bearings during the shaft "landing";
- the facilitation of the justification of catcher bearing design choice.

Legal Aspects
No patents have been issued.

Special Facilities in Use and Their Specifications
For verification of the procedure, a special FLP-500 test rig from IPM (Zittau, Germany) is available for testing the rotor with electromagnetic and catcher bearings. Its technical data are as follows:

Test bearing diameters (max) 300 mm

Speed (max) 7200 mm

Loads:
Pressure 300 kN
Tensile 100 kN
Moment of Torsion 4000 Nm

Kind of Loads axial + radial

Pressure 0–3 bar

Temperature 333 K (393 K)

Medium He, N₂, air, vacuum

Engine Power, Pmax 300 kW

Shaft Mass 1320 kg

Testbox dimensions:
Diameter 1 m
Height 3 m

Scientific Papers
“Dynamic Behavior of Flexible Rotors with Active Magnetic Bearings on Safety Auxilary Bearings,” A.Gelin, J.Der Hagopian, I.M.Pugnet, Proceeding of III Working Conference on Magnetic Bearings, Zittau, Germany, September 1996.

“Active Magnetic Bearings for Rotating Machinery in Future Gas-cooled Reactor Plants,” J. Alastair Rennie, Colin F. McDonald, Proceeding of IV International Symposium on Magnetic Bearings, Zurich, August 1994.

Materials of II and III International Working Seminars on Magnetic Bearings, Zittau, Germany, 1995 and 1996.

Дата добавления: 2015-07-20