OBRABOTKAMETALLOV Vol. 26 No. 3 2024 technology Fig. 2. General pattern for controlling the pressing force of the grinding wheel: 1 – grinding mode control unit; 2 – proportional valve; 3 – converter of the adjusting block; 4 – grinding block; 5 – pneumatic cylinder; 6 – electric motor of the grinding wheel drive addition to these technical characteristics, in order to expand the technological capabilities of the new rail grinding train, it is necessary to provide the possibility of adjusting the grinding wheel speed in the design of the new electric drive. Currently there are no general industrial electric motors with the required technical characteristics, and the creation of a new electric motor is complicated by dimensional limitations associated with the need to place it in the undercarriage space of the rail grinding train. In this connection, JSC “Typhoon” has designed and manufactured a prototype of a new high-speed electric motor according to the required dimensional parameters. To make a decision on the application of a new electric drive in the RGP 2.0, a set of studies and tests is required to confirm the technical characteristics of the electric motor and its compliance with the required grinding modes. Statement of research tasks The main task solved by JSC “Typhoon” in the development of high-speed electric drive was to improve its performance characteristics due to increased productivity and the possibility of regulating the speed of rotation of the grinding wheel. This result was achieved by the fact that in the electric drive, including an electric motor that sets the grinding wheel in motion, and a frequency converter that supplies the electric motor with alternating Ta b l e 1 Main characteristics of high-speed electric drive Technical characteristics Value Motor shaft speed variable in range, rpm 3,600–7,000 Power at least, kW 45 Torque on the electric motor shaft at least, N∙m 60 Overall dimensions: maximum diameter, mm 260 maximum length, mm 580
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