The mechanic-mathematical modelling of the transitional processes during the operation of an electric hoist lifting mechanism motor is conducted by considering the lifting mechanism as a two-mass system consisting of a shaft and two discs, mounted towards its ends – the rotor and the movable friction cone. These transitional processes are an integral part of a single working cycle of the mechanism, which includes starting and stopping during lifting and lowering, with or without a nominal load. A methodology has been developed to investigate the influence of the mass inertial torques of the motor shaft rotating details on the rate of stopping shaft’s transitional processes torque. By establishing a suitable combination of the mass inertial torque rates of the rotor and cone, relative to a minimal dynamic load within a single working cycle of the shaft, a loading coefficient is used as a criterion for the hoist loading for a single working cycle. The methodology is applied to investigate an electric hoist with a capacity of 5 tons, driven by a conical electric motor type КГ 2412-6. Graphical interpretations illustrate the alteration of the inertial torque rates during the transitional processes, which are included in a single working cycle of the hoist and affect the rates of angular deformation and loading coefficient.

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