Finite Element Computation of Magnetic Vibration Sources in 100 kW Two Fractional-Slot Interior Permanent Magnet Machines for Ship

The design of an interior permanent magnet (IPM) machine, in particular, its pole and slot combination, determines the nature of its magnetic forces, which influences not only the torque but also acoustic noise and vibration characteristics. Vibrations can shorten bearing life and are an especially important parameter in marine applications, which have strict regulations such as on electromagnetic compatibility. In this study, two-dimensional(2D) finite element analysis (FEA) was used to model magnetic vibration sources in two 100-kW marine fractional-slot IPM machines with different pole and slot combinations (8 pole-12 slot and 10 pole-12 slot). The magnetic forces were calculated according to rotor position, current phase angle, and load. The results are validated by experiments.

[1]  Timothy J. E. Miller,et al.  Design of Brushless Permanent-Magnet Motors , 1994 .

[2]  Kwang-Joon Kim,et al.  Characterization of noise and vibration sources in interior permanent-magnet brushless DC motors , 2004 .

[3]  Taeyong Yoon.  Magnetically induced vibration in a permanent-magnet brushless DC motor with symmetric pole-slot configuration , 2005, IEEE Transactions on Magnetics.

[4]  Renyuan Tang,et al.  Electromagnetic and mechanical characterizations of noise and vibration in permanent magnet synchronous machines , 2006, IEEE Transactions on Magnetics.

[5]  Gyu-Hong Kang,et al.  The Noise and Vibration Analysis of BLDC Motor Due to Asymmetrical Permanent Magnet Overhang Effects , 2007, 2007 IEEE Industry Applications Annual Meeting.

[6]  Z.Q. Zhu,et al.  Unbalanced Magnetic Forces in Permanent-Magnet Brushless Machines With Diametrically Asymmetric Phase Windings , 2005, IEEE Transactions on Industry Applications.

[7]  I. Husain,et al.  Permanent Magnet Synchronous Motor Magnet Designs with Skewing for Torque Ripple and Cogging Torque Reduction , 2007 .

[8]  Mircea Popescu,et al.  Unbalanced Magnetic Pull Due to Asymmetry and Low-Level Static Rotor Eccentricity in Fractional-Slot Brushless Permanent-Magnet Motors With Surface-Magnet and Consequent-Pole Rotors , 2010, IEEE Transactions on Magnetics.

[9]  Z Q Zhu,et al.  Analytical Modeling and Finite-Element Computation of Radial Vibration Force in Fractional-Slot Permanent-Magnet Brushless Machines , 2010, IEEE Transactions on Industry Applications.

[10]  Mi-Ching Tsai,et al.  Design and Operation of Interior Permanent-Magnet Motors With Two Axial Segments and High Rotor Saliency , 2010, IEEE Transactions on Magnetics.