## 4 Topology of the Permanent Magnet Synchronous Motor
\[\mathrm{T_{ripple}}=\frac{\mathrm{T_{max}-T_{min}}}{\mathrm{T_{avg}}} \tag{71}\] \begin{table}
\begin{tabular}{c c c} \hline \hline
**Quantity** & **Symbol** & **Value** \\ \hline Output Power & \(\mathrm{P_{out}}\) & 10,235.00 kW \\ Input Power & \(\mathrm{P_{in}}\) & 10,426.85 kW \\ Electromagnetic Torque & \(\mathrm{T_{avg}}\) & 198.4124 kNm \\ Torque Ripple & \(\mathrm{T_{ripple}}\) & 1.40\% \\ Torque Angle & \(\mathrm{T_{angle}}\) & 47.11 deg \\ Frequency & \(f\) & 250 Hz \\ Nominal Speed & \(\mathrm{n_{m}}\) & 500 rpm \\ Nominal Voltage & \(\mathrm{V_{n}}\) & 6.6 kV \\ Power Factor & PF & 0.83 \\ Nominal Phase Current & \(\mathrm{I_{ph}}\) & 1101.94 A \\ Stator Winding Density & \(J_{s}\) & 2.75 A/mm\({}^{2}\) \\ Copper Losses Stator & \(\mathrm{P_{scu}}\) & 38.083 kW \\ Magnet Losses & \(\mathrm{P_{pm}}\) & 35.616 kW \\ Core Losses & \(\mathrm{P_{core}}\) & 100.209 kW \\ Friction and Stray Losses & \(\mathrm{P_{fs}}\) & 17.576 kW \\ Wind Losses & \(\mathrm{P_{wind}}\) & 0.366 \\ Total Losses & \(\mathrm{P_{tot}}\) & 191.850 kW \\ Efficiency Rate & \(\eta\)\% & 98.16\% \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Main Characteristics of PMSM. At the same time, the slot filling factor of groove \(s_{\!f}\) was equal to 51%. It should be pointed out that when calculating the filling factor of the groove, the dimensions of the insulation carried by the conductors and the groove itself were taken into account. During the process, the insulation characteristics corresponding to class F were adopted. This value of \(s_{\!f}\) was acceptable and allowed the winding to be wound. The core loss density was approximately equal to 10 W/kg, which was an expected value for the silicon steel used for the stator and rotor core. This low value resulted in part from the fact that no strong saturation was observed in any part of the motor, based on Figure 12, which shows the distribution of the magnetic flux density in the motor under a nominal load. Even in the teeth of the stator, the magnetic flux density did not exceed 1.85 T. The losses in the magnets due to the eddy currents were equal to 35,616 W. The neodymium magnets used had a conductivity equal to 625,000 S/m. The frequency at which the eddy currents circulated in the magnet body was \(f_{u}=(500/60)\)Q\({}_{\mathrm{s}}\), where 500/60 is the motor rotation speed in rps. With Q\({}_{\mathrm{s}}\) equal to 72, the eddy current circulation frequency was 600 Hz. The high frequency combined with the volume of magnets used justified the value of the losses. Finally, the sum of the mechanical losses of the motor was equal to 17,942.34 W, i.e., only 0.18% of the output power, since the motor had a low rotational speed and its diameter was approximately equal to its axial length. Finally, Table 7 lists the performance of the PMSM for various loading conditions as a percentage of the nominal output load. The developed topology exhibited high  
Figure 11: Time Signal of the PMSM Output Torque. Figure 12: Magnetic flux density distribution of the PMSM. performance over the entire considered operating range. Even in overload conditions, i.e., 125% and 150% of rated load, it remained at high levels.