超高速磨削SPWM电主轴系统机电耦合振动的瞬态特性研究

超高速磨削相比于普通磨削具有效率高、表面质量好，可实现难加工材料的精密加工等优点，但是随着砂轮线速度的提高，高速电主轴和高频变频哭的应用越来越广泛，高频高频哭、电主轴、砂轮及磨削载荷之间的机电耦合振动对磨削系统的稳定性和磨削质量的影响越来越显著，因此有必要进行深入的机理研究。为揭示超高速磨削SPWM砂轮电主轴系统的机电耦合振动规律，本文建立了SPWM电压源逆变器供电的砂轮主轴系统的机电耦合数学模型，利用该模型对超高速磨削SPWM砂轮电主轴系统的启动、升速及加入磨削力等瞬变过程进行了数值仿真研究。研究结果表明，该模型能有效地反映SPWM砂轮电主轴系统的机电参数之间的相互影响规律，可以作为超高速砂轮主轴系统研究机电耦合振动的防治和磨削参数的优化的基础；高次谐波电压是诱发超高速磨削机电耦合振动的主要因素；磨削力加载的冲击对横振的影响大于扭振。

Study on Transient Characteristics of Mechanical-Electrical Coupling Vibration of Ultra-High Speed Grinding SPWM Motorized Spindle System

Compared with ordinary grinding, ultrahigh speed grinding has higher efficiency and better surface quality, is more suitable for materials which are difficult to machine. Iowever, with the increase of the wheel periphery velocity, high speed motorzed spindles and high-frequency converters are used more and more widely. The mechanical-electrical coupling vibration among the high-frequency converter, the motorized spindle, the grinding wheel and the grinding loads becomes a new important factor which influences the stability of the grinding system and the grinding quality obviously. Therefore, it is necessary to make a further study on their mechanisms.