A06B-1475-B123  FANUC 交流伺服电机

交流伺服电机的基本常识

交流伺服电动机的结构主要可分为两部分，即定子部分和转子部分。其中定子的结构与旋转变压器的定子基本相同，在定子铁心中也安放着空间互成90度电角度的两相绕组。其中一组为激磁绕组，另一组为控制绕组，交流伺服电动机是一种两相的交流电动机。交流伺服电动机使用时，激磁绕组两端施加恒定的激磁电压UJf，控制绕组两端施加控制电压Uk。当定子绕组加上电压后，伺服电动机很快就会转动起来。通入励磁绕组及控制绕组的电流在电机内产生一个旋转磁场，旋转磁场的转向决定了电机的转向，当任意一个绕组上所加的电压反相

时，旋转磁场的方向就发生改变，电机的方向也发生改变。为了在电机内形成一个圆形旋转磁场，要求激磁电压Uf和控制电压UK之间应有90度的相位差，常用的方法有;

1)利用三相电源的相电压和线电压构成90度的移相

2）利用三相电源的任意线电压

3）采用移相网络

4）在激磁相中串联电容器

Ac servo motor basic knowledge

The structure of AC servo motor can be divided into two parts, namely the stator part and the rotor part. The structure of the stator is basically the same as that of the rotating transformer. In the stator core, a two-phase winding with a space of 90 degrees electrical Angle is also placed. One group of excitation winding, the other group of control winding, AC servo motor is a two-phase AC motor. When the AC servo motor is used, the constant excitation voltage UJf is applied to both ends of the excitation winding, and the control voltage Uk is applied to both ends of the control winding. When voltage is applied to the stator windings, the servo motor will soon turn. The current passing through the excitation winding and the control winding creates a rotating magnetic field in the motor, and the rotation of the rotating magnetic field determines the steering of the motor when the voltage applied to either winding is reversed

When, the direction of the rotating magnetic field changes, and the direction of the motor also changes. In order to form a circular rotating magnetic field in the motor, it is required that there should be a 90 degree phase difference between the excitation voltage Uf and the control voltage UK.

1) Use the phase voltage and line voltage of the three-phase power supply to form a 90-degree phase shift

2) Use any line voltage of three-phase power supply

3) Adopt phase-shifting network

4) Series capacitors in the excited phase

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