CD/P4ADGA

CD/P4ADGA

CD/P4ADGA

CD/P4ADGA

  从基本结构来看，伺服系统主要由三部分组成:控制器、功率驱动装置、反馈装置和电机。控制器按照数控系统的给定值和通过反馈装置检测的实际运行值的差，调《联系人；欧先生》
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节控制量;功率驱动装置作为系统的主回路，一方面按控制量的大小将电网中的电能作用到电机之上，调节电机转矩的大小，另一方面按电机的要求把恒压、恒频的电网供电转换为电机所需的交流电或直流电;电机则按供

       如根据驱动电机的类型，可将其分为直流伺服和交流伺服;根据控制器实现方法的不同，可将其分为模拟伺服和数字伺服;根据控制器中闭环的多少，可将其分为开环控制系统，单环控制系统，双环控制系统和多环控制系统。考虑伺服系统在数控机床中的应用，本文首先按机床中传动机械的不同将其分为进给伺服与主轴伺服，然后再根据其他成要素来探讨不同伺服系统的技术特性。
进给伺服系统
      进给伺服以数控机床的各坐标为控制对象，产生机床的切削进给运动。为此，要求进给伺服能快速调节坐标轴的运动速度，并能精确地进行位置控制。具体要求其调速范围宽，位移精度高，稳定性好，动态响应快。根据系统使用的电机，进给伺服可细分为步进伺服、直流伺服、交流伺服和直线伺服。

步进伺服系统
        步进伺服是一种用脉冲信号进行控制，并将脉冲信号转换成相应的角位移的控制系统。其角位移与脉冲数成正比，转速与脉冲频率成正比，通过改变脉冲频率可调节电机的转速。如果停机后某些绕组仍保持通电状态，则系统还具有自锁能力。步进电机每转一周都有固定的步数，如500步、1000步、50000步等等，从理论上讲其步距误差不会累计。

ALLEN BRADLEY 1336F-BRF75-AA-EN SENSORLESS VECTORed

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Allen-Bradley 1336F-BRF30-AN-EN AC Drive 460V Repaired

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Allen-Bradley 1336F-BRF100-AE-EN-HAS2-L5 10HP 480v VFD

ALLEN BRADLEY 1336F-BRF50-AA-EN-HAS2-L6 VFD 480 V 5 HP

Allen-Bradley 1336F-BRF30-AA-EN4-HA2-L6/D AC Drive 3 HP

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Allen-Bradley 1336 P II 25 HP AC Drive 1336F-B020VAF

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Allen Bradley 1336F-BRF200-AA-EN-HCS2-L9E 20HP AC Drive

Allen-Bradley 1336F-BRF30-AA-EN4-HA2-L6/D AC Drive 3 HP

ALLEN BRADLEY 1336F-BRF30-AN-EN DRIVE 480VAC 3HP 

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Allen Bradley 1336F-BRF15-AA-EN-HAS2-L9E 1.5HP *NEW*

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ALLEN BRADLEY 1336F-BRF75-AA-EN NSPP 1336FBRF7 AEN

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ALLEN BRADLEY 1336F-BRF30-AA-EN-GMS5-L4 DRIVE 3HP *NNB*

Allen-Bradley 1336F-BRF30-AN-EN AC Drive, 3HP

ALLEN BRADLEY 1336F-BRF10-AA-EN-GMS5-L4 DRIVE 1HP *NNB*

ALLEN BRADLEY 1336F-AQF05-AA-EN-6MS5-L4 DRIVE .5HP *NNB

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ALLEN BRADLEY 1336F-C150-AN-EN-HA2-L5/A 150HP DR *XLNT*

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ALLEN BRADLEY 1336F-BRF30-AA-EN-4HA2-L6PP 1336FBRF30

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Allen-Bradley 1336 P II 30 HP AC Drive 1336F-B030VAF

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1336F-BRF20 Allen Bradley Drive

Allen Bradley 1336F-BRF75-AA-EN 7.5HP AC Drive **NIB** 

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ALLEN BRADLEY 1336F-BRF50-AA-EN-HAS2-L4PP 1336FBRF50

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Allen Bradley 1336F-BRF50-AA-EN-HCS1-L5 #10847