## 2 Materials and Methods
Here, the value of the resistance not switched from the common rotor circuit is considered equal to 0.19 \(\Omega\) from the perspective of the optimal parameters according to technological requirements. At the same time, the rigidity of the mechanical characteristics is much lower than that of the characteristics with S\({}^{\prime}\)m = 0.347 (dashed line with a dot) and S\({}^{\prime}\)m = 0.212 (dashed line) in Figure 3a. At S\({}^{\prime}\)m = 0.645, the EOS system tends to self-oscillate at static moments higher than \(M_{\text{st.nom}}\). The system at critical angles of mismatch \(\Delta\phi=90^{\circ}\) develops an equalizing maximum moment equal to \(M_{\text{eq12}}=M_{\text{eq13}}=1.29M_{\text{max}}\) and \(M^{\ast}\) = \(M_{\text{n}}/M_{\text{nom}}\), i.e., it can work stably at static moment values that satisfy the condition of \(M_{\text{st123}}\) = \(1.20M_{\text{max}}\). Figure 3b shows the dependences of \(M_{\text{sym}}=f(S)\) for several slip values in the presence of resistance \(Ra=0.05\); 0.08; 0.19 \(\Omega\). Clearly, approaching synchronous speed greatly reduces the magnitude of the synchronizing components of the motor torques. An increase in the value of active resistances in the common rotor circuit alongside a decrease in the speed of the entire system increases the system's synchronizing capacity [16]. The negative values of the moments' synchronizing components are due to differences in the loads on the shafts. In this case, the synchronizing torques maintain consistent rotation. The difference between these moments determines the action of the entire system. For example, in the variant under consideration, the first engine is assumed to be the most significantly loaded. The synchronizing component of the torque for this engine is equalized by the sum of the moments of the other two engines, i.e., \(M_{\text{sym1}}+M_{\text{sym2}}+M_{\text{sym3}}=0\). Figure 3a presents the synchronizing torques of the system engines with the rotor positions at mismatched angles \(\Delta\varphi_{12}=90^{\circ}\). The equalizing moments between the first and third and the second and third engines of the system at angle \(\Delta\varphi_{13}=0\) take maximum values, gradually decreasing with an increase in \(\Delta\varphi_{13}\). The synchronizing component of the torque for the third machine at \(\Delta\varphi_{13}=180^{\circ}\) is equal to zero, and the other machines are equal to each other but have opposite signs. The equalizing moments reach their maximum at \(\Delta\varphi\pm 90^{\circ}\) and are equal to zero at \(\Delta\varphi=180^{\circ}\) and \(\Delta\varphi=0\) (Figure 3b). With small slips, the motors of the system develop only very limited moments. Therefore, their synchronizing components are small. Therefore, we can conclude that the EOS system in the CM drive works satisfactorily with a slip of at least 0.15-0.3 (Figure 3c,d). The above calculations indicate that in systems with large additional resistances, the torques of certain motors become negative, i.e., the system can only work when mechanical energy is supplied to these motors from the load side. As shown in expression Equation (26), the sum of the asynchronous and synchronizing components of the motors comprises the total equalizing moment between the motors. Equalizing moments are also formed through differences in drive torques. Figure 4 presents graphs based on the calculation results when the supply voltage of the motors changes. In a MAED system with TVCs, the synchronizing capacity is determined by equalizing torques consisting of the difference in the torques of the motors of the system with changes in the magnitude of the supply voltage. Here, the mechanical characteristics of the system engines in Figure 4a were obtained with \(U_{1}=U_{2}=U_{3}\) and \(\varphi_{1}=\varphi_{2}=\varphi_{3}=0\), i.e., all characteristics are identical based on the accepted identity of engines \(M_{1}\), \(M_{2}\), and \(M_{3}\).