Development of a simulation model for the investigation of vibrations in large asynchronous machinesCopyright: © IGMR
Software development for rotor dynamic analysis of supercritically operated asynchronous motors
In the development of asynchronous motors, rotor-dynamic calculations are an important part of the machine design. The position of the critical speeds resulting from the natural frequencies relative to the operating speed is decisive for the permanent operability of a machine. If the distance between critical speed and operating speed is too small, the machine can be directly destroyed by strong resonance increases or can be reduced in its service life by the resulting, strong alternating loads. Since large asynchronous motors often have to be operated supercritically (i. e. above the first critical speed), resonance-induced vibration increases can occur when the machine is started and stopped. These must be recorded mathematically in order to avoid excessive oscillations in advance by design measures. Development of a simulation model for the investigation of vibrations in large asynchronous machines
Objectives of the simulation program
A simulation program adapted to the problem area of large asynchronous motors can greatly reduce the time required for the necessary rotor-dynamic calculations. With the help of the application-specific simulation program, it is possible to estimate not only the critical speeds but also the behaviour of the rotor during resonance transits, both qualitatively and quantitatively. Due to its modular structure, the program can be easily extended and thus adapted to new problems. The calculation software is implemented in the Matlab environment, using the Finite Element Method (FEM), which is widely used for the numerical solution of technical problems.