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22165.___传感器的转换元件是指传感器中能直接感受或响应被测量的部分。
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22166.___感应同步器是一种应用电磁感应原理制造的高精度检测元件,有直线和圆盘式两种,分别用作检测直线位移和转角。
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22167.___选择传感器时,如果测量的目的是进行定性分析,则选用绝对量值精度高的传感器,而不宜选用重复精度高的传感器。
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22168.___传感器在使用前、使用中或修理后,必须对其主要技术指标标定或校准,以确保传感器的性能指标达到要求。
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22169.___驱动部分在控制信息作用下提供动力,伺服驱动包括电动、气动、液压等各种类型的驱动装置。
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22170.___气压式伺服驱动系统常用在定位精度较高的场合使用。
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22171.___永磁型步进电动机即使其定子绕组断电也能保持一定转矩,故具有记忆能力,可用于定位驱动。
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22172.___步进电动机的转动惯量越大,同频率下的起动转矩就越大。
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22173.___直流伺服电动机的调速特性是电机转速与其输出转矩的关系。
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22174.___数字式位移传感器有光栅、磁栅、感应同步器等,它们的共同特点是利用自身的物理特征,制成直线型和圆形结构的位移传感器,输出信号都是脉冲信号,每一个脉冲代表输入的位移当量,通过计数脉冲就可以统计位移的尺寸。
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22175.___电液伺服系统的过载能力强,在强力驱动和高精度定位时性能好,适合于重载的高加减速驱动。
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22176.___通常,步进电机的最高连续工作频率远大于它的最高启动频率。
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22177.___脉冲分配器的作用是使电动机绕组的通电顺序按一定规律变化。
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22179.___机械系统的刚度越大,固有频率越小。
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22180.___计算机控制系统的采样周期越小,其控制精度就越高。
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22181.___计算机控制系统设计完成后,首先需要对整个系统进行系统调试,然后分别进行硬件和软件的调试。
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22183.___PLC 采用扫描工作方式,扫描周期的长短决定了 PLC 的工作速度。
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22184.___喷漆机器人的开发设计过程中,详细设计完成后即可进行样机的试制。
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22185.___图形符号和文字标号用以表示和区别二次回路图中的各个电气设备。
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22186.___对电子仪表的接地方式应特别注意,以免烧坏仪表和保护装置中的插件。
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22187.___在混凝土和泥土等导电地面使用电烙铁,其外壳必须妥善接地,以防触电。
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22188.___互感器二次绕组在接入仪表时极性的反正无所谓。
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22189.___回路编号用来区别电气设备间互相连接的各种回路。
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22190.___远动通信设备应直接从间隔层测控单元获取调度所需的数据,实现远动信息的直采直送。
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22191.___变电站监控系统同期检测功能应能对断路器合闸回路本身具有的时滞进行补偿。
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22192.___安装并联电容器的目的,一是改善系统的功率因数,二是调整网络电压。
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22193.___为了解决遥信误、漏报和抖动问题,可采用双位置遥信和提高遥信输入电压等技术手段来提高遥信的可靠性。
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22194.___状态量用一位码表示时:闭合对应二进制码“1”,断开对应二进制码“0”用两位码表示时:闭合对应二进制码“01”,断开对应二进制码“10”。
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22195.___遥控有两种方式:一种是返送校核方式,另一种是直接执行方式。
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22196.___自动化系统中,运行电压控制目标值___应能在线修改。
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22197.___相位表的指针不随负载电流和电压的大小而变化。
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22198.___测控装置工频交流电量输人回路应有隔离电路,且应有电压互感器和电流互感器回路异常报警。
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22199.___模拟信号是连续信号,而数字信号是离散信号。
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