Study on Dynamic Characteristics of Permanent Magnet Semi-Direct Drive Cutting Transmission System in Shearer
Combined with the electromagnetic effect of the permanent magnet motor and the bending-torsional vibration charac-teristics of the transmission system,the gear-bearing coupling dynamic model of the gear transmission system is established with wear,gear time-varying meshing stiffness,bearing support stiffness and permanent magnet motor vector control.By calculating the electromagnetic stiffness of the permanent magnet synchronous motor,the natural frequency,modal shape and first-order modal energy distribution of the system are obtained.The dynamic characteristics of the transmission system when subjected to wear,shock load excitation,and voltage mutation excitation are simulated and analyzed.The results show that the electromag-netic effect reduces the first-order natural frequency of the mechanical system,and the first-order torsion energy is mainly con-centrated in the motor and the cutting drum.After considering the wear,greater meshing force fluctuations are generated in the system,which changes the dynamic response of the mechanical transmission system.The shock and the sudden change of voltage cause the system to produce instantaneous free vibration dominated by the first-order mode.The reverse torsional vibration of the motor rotor will produce a large torsional shear stress near the node on the motor shaft.
PMSMShearerWearNon-Steady State ConditionTorsional Vibration
万方数据
维普
