本文主要研究了直接驱动永磁同步电机转台系统的伺服刚度问题。
The dissertation mainly discusses the servo stiffness of direct drive NC rotary table servo system.
论文首先针对直线电机进给系统伺服刚度的特点，提出了直线电机进给系统伺服刚度的定义和评价方法。
Firstly, the definition and evaluation method is brought forward since the servo stiffness of the linear motor drives takes on new features.
实验结果表明，直线电动机的伺服刚度只受位置环比例增益的影响较大，而其它的控制参数对伺服刚度幅值影响不大。
The result presents that the servo rigidity is more influenced by proportion plus of position loop than by other parameters.
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