*No-Load Analysis*

To examine the operation of the machine used to validate the proposed single invertercontrolled brushless WFSM topology under no-load condition, no load analysis of the machine was carried out in JMAG-Designer. The machine was provided with a field current of 1 A dc and was operated at 1800 rpm. The flux linkage of the machine under such conditions is presented in Figure 11a, whereas the magnetic flux density plot is presented in Figure 11b. A back-EMF of 76.671 *Vrms* was generated in the stator winding of the machine and is presented in Figure 12a. To show the harmonics present in the induced back-EMF, a FFT plot of the back-EMF was generated and is shown in Figure 12b. The cogging torque of the machine is 0.04 Nm (peak-to-peak). The generated cogging torque is presented in Figure 13. The no-load analysis results are presented in Table 4.

**Figure 11.** (**a**) Flux linkage and (**b**) magnetic flux density plot.

**Figure 12.** (**a**) Back-EMF of the employed machine and (**b**) its FFT plot.

**Figure 13.** Cogging torque.

**Table 4.** No-load analysis.

