Study of Frequency Controlled Drive of Locomotive Power Plant Cooling Fan

One of the options for calculating the frequency-controlled asynchronous drive of the locomotive power plant cooling fan is considered. The block diagram of the auxiliary frequency converter, as well as the calculation results of the drive for the 2TE25A diesel locomotive are presented. The obtained characteristics of a frequency-controlled asynchronous drive at the same supply frequency $\alpha$ and the same absolute slip $\beta$ and decrease in the phase voltage Ul by half allow us to conclude that the current also decreases by half, the electromagnetic moment decreases four times for the same absolute slip of the rotor $\beta$ within the working area of its mechanical characteristics. In this case, the critical slip of the investigated drive will remain constant. In case of constant voltage U
1
, the greater is the value of the electromagnetic moment, the lower is the relative frequency cx for any absolute slip $\beta$. Accordingly, the change in the magnitude of the drive supply voltage U
1
affects the efficiency of its mechanical characteristics.