Unbalanced Response Analysis of Ultra High Speed and High Power Motor Shaft System
The DyRoBeS rotor dynamics analysis software is used to calculate the critical speed and unbalance response of the long-distance pipeline compressor 20MW high-speed variable frequency explosion-proof motor project shaft system, so as to avoid the resonance of the shafting during normal operation, thus achieving ultra-high speed. The power motor provides a basis for the stability analysis and optimization design of the shafting.
0 Preface
During the operation of the rotating machinery, vibration is generated due to various disturbance forces, and vibration is one of the main problems of the failure of the rotating mechanical rotor. For the rotor system itself, lateral bending vibrations due to mass eccentricity are the most common, especially at certain or certain specific speeds, the amplitude will increase significantly, and even the shaft and bearing will be destroyed. The phenomenon is usually caused by resonance. In order to avoid resonance of the shafting during normal operation, the design of the shafting system requires that its critical speed should avoid a certain range of frequency conversion and external excitation frequency of the normal operation of the startup group.
This paper mainly relies on the 20MW high-speed variable frequency explosion-proof motor project of long-distance pipeline compressor, and uses DyRoBeS rotor dynamics analysis software to carry out critical speed calculation and unbalance response analysis of the whole shafting system (host and exciter) of the motor. This unit is a three-bearing structure with a rotational speed of 3120~5040rpm. In order to ensure the stable operation of the unit, the end bush of the exciter needs to carry 300kg at the lower end. When installing, the bearing seat must be raised by a certain amount, which needs to be calculated theoretically.
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