OBRABOTKAMETALLOV Vol. 25 No. 3 2023 technology Fig. 10. Dependence of the pressing force of grinding wheel to rail on pressure in the pneumatic pressing system force is realized at a pressure in the pneumatic system up to 0.2 MPa, regardless of the rotation speed of the grinding wheel. According to the test results, the dependence of the change in the current load in the stator windings of the electric motor on the pressing force was obtained. Graphically, the dependence is shown in fig. 11. The graph shows that the change in the current load in the stator windings of the electric motor has a linear dependence on the forces arising during grinding. At the same time, it is established that for the tested electric drive, to ensure the design range of the rated current load of 45 A (Table 1), it is required to ensure the pressing force of the grinding wheel to the rail in the range of 2,500–2,800 N. The obtained dependences make it possible to adjust the force of pressing the grinding wheel to the rail and ensure the nominal operating modes of the high-speed grinding electric drive. Fig. 11. Dependence of current load change in the stator windings of the electric motor on the force of pressing the grinding wheel to rail
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