Rotor-Dynamic Characteristic Evaluation of Interior Permanent Magnet Motor using Finite Element Method

Hilman Syaeful Alam, Pudji Irasari


Dynamic characteristics of a critical speed of the rotor components at interior permanent magnet motor were evaluated using one-dimensional (1D) and three-dimensional (3D) finite element methods. Critical speed of the rotor wasinvestigated in the Campbell diagram, which shows the relationship between natural frequency and rotational velocity of the system when the motor is not in operation. The 1D finite element analysis shows that there are two modes which are close to the design frequency of 300 Hz i.e. mode 1 and 2. However the critical rotational velocity in both modes are still far above the maximum velocity design of 6,000 rpm. Validation using 3D finite element analysis demonstrated that all modes were still above the designed frequency and did not find any critical speed below 6,000 rpm. It can be concluded that the critical speed of the rotor of IPM motor is still outside the system resonance region, and can be operated safely.


natural frequency; campbell diagram; interior permanent magnet motor; finite element method

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C. Y. Young, et al.,“Research on the Output Characteristics of IPMSM according to the Pole-Slot Combinations,? Energy Precedia, Vol. 14, pp. 1187-1192, 2012. crossref

H. M. Hasanien, “Torque Ripple Minimization of Permanent Magnet Synchronous Motor using Digital Observer Controller,? Energy Conversion and Management, Vol. 51, pp. 98-104, 2010. crossref

C.C. Hwang, et al., “Comparison of Performances Between IPM and SPM Motors with Rotor Eccentricity,? Journal of Magnetism and Magnetic Materials, Vol. 282, pp. 360-363, 2004. crossref

J. D. Ede, et al., “Rotor Resonances of High-Speed Permanent-Magnet Brushless Machines,? IEEE Transactions on Industry Applications, Vol. 38, No. 6, pp. 1542-1548, 2002. crossref

S. I. Kim, et al., “Optimization for Reduction of Torque Ripple in Interior Permanent Magnet Motor by Using the Taguchi Method,? IEEE Transactions on Magnetics, Vol. 41, No. 5, pp. 1796-1799, 2005. crossref

F. Trebuňa1, et al., “Numerically Computed Dynamics Rotor using Ansys Software,? The 4th International Conference: Modelling of Mechanical and Mechatronic systems, Herľany, Slovak Republic, pp. 498-501, 2011.

B. Bai, et al.,?Analysis of Dynamic Characteristics of the Main Shaft System in a Hydro-turbine Based on ANSYS,? Procedia Engineering, Vol. 31, pp. 654-658, 2012. crossref

H. Taplak and M. Parlak, “Evaluation of Gas Turbine Rotor Dynamic Analysis using the Finite Element Method,? Measurement, Vol. 45, pp. 1089-1097, 2012. crossref

I. Bucher and D. J. Ewin, “Modal Analysis and Testing of Rotating Structures,? Philosophical Transactions - The Royal Society London, Vol. 359, pp. 61-96, 2001. crossref

M. Chouksey, et al., “Modal Analysis of Rotor-Shaft System under the Influence of Rotor-Shaft Material Damping and Fluid Film Forces,? Mechanism and Machine Theory, Vol. 48, pp. 81-93, 2012. crossref

P. Paolaor, et al., “Studies of Mechanical Vibrations and Current Harmonics in Induction Motors Using Finite Element Method,? WSEAS Transactions on Systems, Issue 3, Vol. 7, pp. 195-202, 2008.

Hilman S. Alam, et al., “Analytical and Numerical Deflection Study on the structure of 10 kW Low Speed Permanent Magnet Generator,? Mechatronics, Electrical Power, and Vehicular Technology, Vol. 03, pp. 87-94, doi: 10.14203/j.mev.2012.v3.87-94, 2012. crossref

Hutton, D. V., Fundamental of Finite Element Analysis, USA: The McGraw Hill Company, 2004, pp. 1-50.

Rao S. S., “The Finite Element Method in Engineering 4th Edition,? Elsevier Science, 2004.

M. Lalanne, G. Ferraris, Rotor dynamics Prediction in Engineering, 2nd Edition, United Kingdom: John Wiley and Sons Ltd, 1998, pp. 1-248.

T. Admono, (2003), “Pembuatan Program Simulasi Prediksi Prilaku Dinamik Sistem Mono rotor Menggunakan Matlab,? Pusat Penelitian Informatika LIPI,. [online]. Available:

JIS S45C Mild Steel an Overview, Mead Info, 2010. [online]. Available:

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