DYNAMIC PROPERTIES OF PLOUGH PLANT DRIVES WITH EKVS4-160U5 HIGH-TORQUE ELECTRIC MOTOR AND WAYS TO MODERNIZE THEM
Background. As part of the mechanized plough plants, it is planned to use high-tech power equipment, frequency-controlled electric drives, and intelligent components in control systems that automatically adapt the operating mode of the plough drives to the operational conditions of the operation of the treatment plant equipment. Materials and/or methods. The formation of the operational spectrum of loads of plough drives is due to the interaction of useful technological loads on the cutters, and self-oscillating processes in the chain from the nonlinear law of friction in the plough supports on the conveyor under «steady» operating modes, as well as the dynamics of transient electromagnetic processes in engines with frequent starts and reversals, taking into account the damping properties of the asynchronous motor (AM) and its connection with the mechanical part of the dynamic system. Such studies were carried out concerning the electromechanical drive systems of cleaning combines and high-pressure pumping units of pumping stations. The work experience indicates the need to study complex electromechanical systems of plough plant (PP) drives using the dynamic characteristics of the AМ, taking into account the features of its damping properties and operating modes. The plough drive structure includes: AМ type EKVS4-160U5, a gearbox with an elastic coupling, a drive sprocket is fixed on the output shaft of the gearbox, a chain of calibre 30x108c with a length of 400 m. The chain's working branch moves the plough, which separates the coal from the formation and loads it on the conveyor. Coal mining is carried out according to the shuttle scheme in the lava with a length of 200 m. Next, the method of studying torsional vibrations in the plough drive without considering the longitudinal vibrations of the plough body and the traction chain is considered. When determining the natural frequencies of the AМ and the drive as a whole, the structure of the drive and the rules for calculating the reduced masses of the drive parts were taken into account. Results. In the drive of the analyzed PP disturbances are formed in the traction chain's engagement with the drive sprocket (12.8 s-1) at the natural frequency of the electric drive of 11.5 s-1. At the same time, torsional resonant oscillations with a frequency of 11.5 s-1 and amplitude of 3.73 rad/s are superimposed on the rotor's rotation with 153.8 s-1 frequency. The unevenness of the angular velocity of the engine is 4.8 %. Conclusion. In further studies, it is necessary to study in more detail the effect of longitudinal vibrations of the plough body with variable length and stiffness of the working section of the traction chain on torsional vibrations in the drive.