## 4 Simulation and Experimental Results
### Experimental Results
\begin{table}
\begin{tabular}{c c c c c c c c} \hline
**Rotational** & **Load** & **Current** & **Input Electric** & **Line Current** & **Phase Current** & **Input Electric** & **Difference** \\
**Speed** & **Torque** & **THD--Y** & **Power—Y** & **THD—A** & **THD—A** & **THD—A** & **Power—A** & **in Power [W]** \\
**[RPM]** & **[Nm]** & **[\%]** & **[W]** & **[\%]** & **[\%]** & **[\%]** & **[W]** & **[W]** \\ \hline \multirow{4}{*}{(1.7 Wb)} & 0 & - \({}^{1}\) & 99 & - \({}^{1}\) & - \({}^{1}\) & 182 & 83 \\ \cline{2-7}  & 15 & - \({}^{1}\) & 227 & - \({}^{1}\) & - \({}^{1}\) & 362 & 135 \\ \cline{2-7}  & 30 & - \({}^{1}\) & 648 & - \({}^{1}\) & - \({}^{1}\) & 874 & 226 \\ \cline{2-7}  & 37 & - \({}^{1}\) & 935 & - \({}^{1}\) & - \({}^{1}\) & 1246 & 311 \\ \hline \multirow{4}{*}{(1.7 Wb)} & 0 & - \({}^{1}\) & 118 & - \({}^{1}\) & - \({}^{1}\) & 212 & 94 \\ \cline{2-7}  & 15 & - \({}^{1}\) & 367 & - \({}^{1}\) & - \({}^{1}\) & 478 & 111 \\ \cline{2-7}  & 30 & - \({}^{1}\) & 885 & - \({}^{1}\) & - \({}^{1}\) & 1072 & 187 \\ \cline{2-7}  & 37 & - \({}^{1}\) & 1205 & - \({}^{1}\) & - \({}^{1}\) & 1440 & 235 \\ \hline \multirow{4}{*}{(1.7 Wb)} & 0 & - \({}^{1}\) & 154 & - \({}^{1}\) & - \({}^{1}\) & 270 & 116 \\ \cline{2-7}  & 15 & 3.5 & 632 & 4.5 & 10.4 & 758 & 126 \\ \cline{2-7}  & 30 & 2.7 & 1370 & 2.6 & 6.8 & 1550 & 180 \\ \cline{2-7}  & 37 & 2.4 & 1785 & 2.8 & 6.5 & 2000 & 215 \\ \hline \multirow{4}{*}{(1.7 Wb)} & 0 & 5.8 & 195 & 8.7 & 27.1 & 324 & 129 \\ \cline{2-7}  & 15 & 4.6 & 1065 & 6.7 & 16.3 & 1196 & 131 \\ \cline{2-7}  & 30 & 3.4 & 2187 & 4.5 & 9.5 & 2387 & 200 \\ \cline{2-7}  & 37 & 3.2 & 2830 & 3.5 & 9.5 & 2980 & 150 \\ \hline \multirow{4}{*}{(1.7 Wb)} & 0 & 8.3 & 156 & 14.2 & 18.8 & 278 & 122 \\ \cline{2-7}  & 15 & 4.2 & 1502 & 5.9 & 8.1 & 1651 & 149 \\ \cline{2-7}  & 30 & 2.9 & 3300 & 4.4 & 9.0 & 3500 & 200 \\ \cline{2-7}  & 37 & 3.7 & 4415 & 4.4 & 11.5 & 4640 & 225 \\ \hline \multirow{4}{*}{(1000) (1.3 Wb)} & 0 & 11.5 & 194 & 19.2 & 22.4 & 310 & 116 \\ \cline{2-7}  & 15 & 5.5 & 1875 & 8.7 & 10 & 2016 & 141 \\ \cline{2-7}  & 30 & 3.7 & 4140 & 5.7 & 10.6 & 4350 & 210 \\ \cline{2-7}  & 37 & - \({}^{2}\) & - \({}^{2}\) & 5.3 & 11.1 & 5750 & - \({}^{2}\) \\ \hline \multirow{4}{*}{(1250 (1 Wb)} & 0 & 15.5 & 208 & 27.7 & 28 & 327 & 119 \\ \cline{2-7}  & 10 & 6 & 1590 & 10.7 & 10.9 & 1725 & 135 \\ \cline{2-7}  & 20 & 3.8 & 3515 & 6.5 & 10.8 & 3725 & 210 \\ \hline \multirow{4}{*}{(1.3 Wb)} & 30 & - \({}^{2}\) & - \({}^{2}\) & 6.0 & 11.7 & 5170 & - \({}^{2}\) \\ \cline{2-7}  & 37 & - \({}^{2}\) & - \({}^{2}\) & 5.7 & 11.6 & 6700 & - \({}^{2}\) \\ \hline \multirow{4}{*}{(1430 (1 Wb)} & 0 & 13.6 & 242 & 25.9 & 26.5 & 355 & 113 \\ \cline{2-7}  & 5 & 8.5 & 910 & 16.0 & 16.5 & 1035 & 125 \\ \cline{2-7}  & 10 & 5.3 & 1785 & 10.1 & 10.3 & 1925 & 140 \\ \cline{2-7}  & 15 & 4.2 & 2780 & 7.3 & 9.5 & 2945 & 165 \\ \hline \multirow{4}{*}{(1.7 Wb)} & 20 & - \({}^{2}\) & - \({}^{2}\) & 9.0 & 15.9 & 3620 & - \({}^{2}\) \\ \cline{2-7}  & 30 & - \({}^{2}\) & - \({}^{2}\) & 7.2 & 12.4 & 5385 & - \({}^{2}\) \\ \cline{2-7}  & 37 & - \({}^{2}\) & - \({}^{2}\) & 6.4 & 11.3 & 6720 & - \({}^{2}\) \\ \hline \end{tabular} \({}^{1}\) Below the oscilloscope resolution. \({}^{2}\) The operating point could not be reached.  
\end{table} 
Table 2: Comparison of current the total harmonic distortion (THD) and input electric power in multiple operating points for a delta and star winding connections. An oscillogram showing the comparison of the line currents for a delta and star connection and operating point 1000 RPM, 1 Wb, and 15 Nm is depicted in Figure 13. The line current distortion was, visually and in THD, more significant in the delta-connection. Figure 11: Line current THD for a star and delta; reference speed 500 RPM, reference stator flux 1.7 Wb. Figure 12: Consumed electric power for a star and delta; reference speed 500 RPM, reference stator flux 1.7 Wb. Figure 14 then compares the line and phase current of a delta-connected machine for the speed of 1000 RPM, stator flux 1.7 Wb, and load torque 0 Nm.