**Acknowledgements**

where *F*(*t*) is load vector, *M* is mass, *C* is damping, *K* is stiffness, *x* is displacement vector, *a* is

On the basis of this equation, the individual displacements of the bodies are then determined. Several other parameters have to be taken into account to set the calculation correctly. One of the things that need to be set is the material properties of the individual parts of the simulated machine. The material properties are the material density, the Poisson's ratio and the Young's modulus for mechanical analysis. These material properties can be found on the Internet or

Another parameter that affects the quality of the result is the final set-up of the mesh. There is a need to focus on to focus on where forces work or where there is a small cross-section on model. At these points of the model, it is necessary to manually adjust the strength of the mesh

Another parameter is to determine the properties of the contact surfaces. Particularly, for more complex models, results are poor where there is a poor contact surface setting. The Ansys mechanical analysis module uses five types of contact surfaces such as bounded, without separation, without friction, friction and pulping. Their choice depends on the knowledge of the construction of the electrical machine and on the way of the mechanical connection of

Since the vibration of electric machines is a carrier of information about its state, the issue of vibration calculation is very topical. When designing any electrical machine, the designer must reach to a certain standard of vibration which is given by the norm. In many cases, when designing a new machine, there were problems with vibration. This problem occurs only after the prototype has been created. By using finite element methods in vibration determination, designer can achieve very interesting results that can help minimize the vibration of electrical machines at the design stage. It can mean considerable savings for the manufacturing company. The calculation of vibrations using the Ansys program is a very complex issue. The correct setup of electromagnetic computation requires experience not only with calculating electrical

(*t*)).

acceleration vector (*a* = *x*¨(*t*)), and v is velocity vector (*v* = *x*̇

204 Finite Element Method - Simulation, Numerical Analysis and Solution Techniques

requested from the material supplier.

**Figure 7.** Vibration results from FEM.

to avoid any unwanted effect on the result.

its individual parts [4, 8] (**Figure 7**).

**10. Conclusions**

This research work has been carried out in the Centre for Research and Utilization of Renewable Energy (CVVOZE). Authors gratefully acknowledge the financial support from the Ministry of Education, Youth and Sports of the Czech Republic under NPU I program (project No. LO1210).
