The main objective of this thesis is numerical modelling and analysis of a twelve pole synchronous motor with surface mounted magnets. The finite element based numerical models have been built using Altair Flux software. Base on the numerical simulations, the influence of surface mounted magnets' position and magnetization on the synchronous motor output characteristics (such as 2D magnetic flux density distribution in the model and the profiles of the normal component of the magnetic flux density in the air gap, cogging torque and the induced back electromotive force) have been analysed.
In the first part of the thesis we performed the magneto static numerical calculations on a simplified 2D numerical model configuration, which significantly reduced the numerical calculation time. Based on the obtained results we demonstrated that four-segment magnet position and magnetisations results in a lower cogging torque compared to the separate magnet segmentation.
In the second part of the thesis, we focused on more accurate and realistic modelling of the motor. The winding scheme was adjusted to the real motor, and the calculations were performed in a time-dependent magnetic analysis. The measured induced voltages obtained from the real motor were compared with the calculated values in the numerical model. We also compared calculations performed with different air gaps and found that as the air gap increases, the cogging torque decreases.
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