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随着电气传动技术（变频调速技术、电动机矢量控制技术等）的迅速发展和日趋完善，高速数控机床主传动系统的机械结构已得到极大的简化，基本上取消了带轮传动和齿轮传动。机床主轴由内装式电动机直接驱动，从而把机床主传动链的长度缩短为零，实现了机床的“零传动”。这种主轴电动机与机床主轴“合二为一”的传动结构形式，使主轴部件从机床的传动系统和整体结构中相对独立出来，因此可做成“主轴单元”，俗称“电主轴”(ElectricSpindle,Motor Spindle)。由于当前电主轴主要采用的是交流高频电动机，故也称为“高频主轴”（High FrequencySpindle)。由于没有中间传动环节，有时又称它为“直接传动主轴”（Direct Drive Spindle)。

Motorized spindle is appeared in the field of nc machine tool spindle and the spindle motor with new technology,
Motorized spindle
It with the linear motor technology, high speed cutting tool technology, the high speed machining into a new era. Motorized spindle is a set of components, it includes motorized spindle itself and its accessories: motorized spindle, high frequency inverter device, oil mist lubrication, cooling device, the built-in encoder, tool change device, etc. The rotor of the motor directly as a machine tool spindle, spindle unit is the motor of the shell frame, and cooperate with other parts, to realize the integration of motor and spindle.
As electrical drive technology (frequency control of motor speed, motor vector control technology, etc.) of the rapid development and gradually perfect, the ? of high-speed nc machine tool main drive system