METSO IOP351

上位控制器 生成电机动作轨迹，向伺服放大器发出指令。其接口一般适用脉冲列，每发送1个脉冲指令，伺服电机便像步进电机一样旋转一定角度。因此，上位控制器也可以用于步进电机。各厂商的接口已经统一，并非一定要选电机同品牌的上位控制器。不过，本专栏介绍的交流伺服驱动器已将上位控制器和伺服放大器设计为一体了，不需要单独的上位控制器。 伺服放大器 伺服放大器由伺服控制器与电机驱动放大器组成。交流伺服电机的伺服控制几乎都是数字控制，采用高性能的DSP或者微控制器。电机驱动放大器则是采用矢量控制三相正弦波PWM驱动。 交流伺服电机 交流伺服电机由电机与位置检测装置组成。要控制电机，首先要加深对电机的理解。

直流伺服电机的优点： （1）小型轻量，效率高。 （2）适合低电压工作。 （3）采用高性能永磁体可以得到高效率/大功率。 （4）电机与伺服放大器的系统价格较低。 （5）通过反馈，旋转精度及定位性能等基本性能很高。 直流伺服电机的缺点： （1）要根据负载进行伺服控制。 （2）存在电刷磨损，需要保养。 （3）电刷磨损会产生粉尘，不适用于洁净环境。 （4）会产生机械及电机噪声。 无铁心直流电机，很多厂商将其用于直流伺服电机。无铁心直流电机的特点如下： （1）转子惯量小。 （2）电机线圈的电感小，整流特性好。 （3）不产生齿槽转矩。

Working principle of AC servo motor

The rotor inside the servo motor is a permanent magnet, and the U/V/W three-phase electricity controlled by the driver forms an electromagnetic field, and the rotor rotates under the action of this magnetic field, while the encoder of the motor comes with a feedback signal to the driver, and the driver adjusts the rotation Angle of the rotor according to the feedback value and the target value. The accuracy of the servo motor is determined by the accuracy of the encoder (number of lines).

What is the difference between AC servo motor and brushless DC servo motor in function?

Ac servo is better, because it is sine wave control, torque ripple is small. Dc servo is trapezoidal wave. But DC servo is simpler and cheaper.

Permanent magnet AC servo motor

Since the 1980s, with the development of integrated circuits, power electronics technology and AC variable speed drive technology, permanent magnet AC servo drive technology has been prominent development, electrical manufacturers in various countries have launched their own AC servo motor and servo drive series products and continue to improve and update. Ac servo system has become the main development direction of contemporary high-performance servo system, which makes the original DC servo face the crisis of being eliminated. After the 1990s, the AC servo system that has been commercialized in all countries in the world is the sine wave motor servo drive with full digital control. The development of AC servo drive in the field of transmission is changing with each passing day. Compared with DC servo motor, the main advantages of permanent magnet AC servo motor are:

(1) No brush and commutator, so reliable work, low maintenance and maintenance requirements.

(2) The stator winding heat dissipation is more convenient.

(3) Small inertia, easy to improve the rapidity of the system.

(4) Suitable for high speed and large torque working state.

(5) Smaller volume and weight under the same power.

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主要产品有各种模块/卡、控制器、触摸屏、伺服驱动器

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