Effect of Inverter Modulation Parameters on Mechanical-electric Coupling Vibration of an Ultra-High Speed Grinding System Driven by a Motorized Spindle

摘要

In order to improve the stability of a grinding system and suppress the mechanical-electric coupling vibration caused by a high-frequency converting current device, the effect of modulation parameters of an inverter on the mechanical-electric coupling vibration of an ultra-high speed grinding system driven by a motorized spindle is necessary to be studied. On the basis of a mechanical model of a grinding wheel rotor system, a mechanical-electric coupling model constituted by an inverter, a motorized spindle, a grinding wheel and grinding loads is established. Numerical methods are used to study physical mechanism of mechanical-electric coupling vibrations in some typical non-stationary processes, such as the starting, the speed rising and the grinding force importing. In numerical simulations, the physical mechanism of mechanical-electric coupling vibrations in two different modes of power supply,including an ideal sinusoidal voltage-source and a voltage-source inverter is studied comparatively. The physical mechanism of the mechanical-electric coupling vibration caused by high-order harmonic currents is revealed and its varying principle with inverter modulation parameters is given. Besides, an effective suppression method of the mechanical-electric coupling vibration induced by high-order harmonic currents is proposed.