**5. Conclusions**

	- − The speed of response of the system with the optimal controller was higher by 1.3 s compared to the basic control system;
	- − Transient characteristic of the system with the optimal controller was free from oscillations. The oscillations were present in the transient characteristic of the basic system. The overshoot of the basic system was equal to 14.3%.
	- − The steady-state value of the transient function of the both systems was 450 A, which corresponded to the nominal value of the phase current of the stator of the traction motor.

The accuracies of control of the two systems were calculated on the basis of the transient characteristics of the current control channels under the condition of the presence of 'white noise' interferences at the controller input. The accuracy of the control of the system with the optimal controller was higher by 1.3% than that of the basic system.

Analysis of the time diagrams of the phase currents of the traction drive showed that the presence of interferences at the input of the current controller in the optimal controller did not influence the value of the phase current of the motor stator. In the basic system, the value of the phase current of the stator was lower by 1.3% compared to the operation without interferences. This fact suggests that the power loss is 1.69% lower in the traction drive with the optimal controller than in the traction drive with the basic control system.
