北京OTAC-01变频器促销

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4. 继电器时间参数的获取方法
继电器时间参数的检测主要利用电秒表和光线示波器等模拟试验的方法得到，传统检测方法测量速度慢、误差大、测量不准确等。随着计算机技术的发展，越来越多的继电器检测装置应用微处理器，这些检测装置其原理大体相同。文献中提到了一种时间参数检测电路，该电路主要组成部分为单片机，其检测原理为：当继电器触点闭合时，单片机对应输入通道电压为 5V，端口为“1”，当继电器断开时，其对应电压为 0V，I/O端口为“0”。当给继电器加励磁电压时，单片机以足够小的采样周期读取单片机对应的数字I/O端口，经过数据处理，即可计算出相应的时间参数。但是采用此种方法在继电器接直流负载时基本符合，当接交流负载时，由于交流电压是交变的，继电器断开时时单片机端口电压的瞬时值也有可能很小或接近于零。因此，在触点所接回路为交流回路时，利用触点间电压瞬时值的大小来判断触点的闭合与断开状态，误差就会很大，从而得不到准确的数值。文献中提到了一种继电器时间参数的计算机检测方法，它采用自行研制的采集板卡，其主要由单片机及其电路组成。该方法可以检测到继电器动作时间、动作回跳时间、释放时间、释放回跳时间等时间参数。单片机接于线圈驱动电路中控制励磁线圈通电与断电，采集继电器闭合与分断时触点的状态，并计算其时间参数。其检测原理为：当继电器线圈通电时触点经过定的动作时间才能够闭合，因此单片机先采集到数据 0，触点闭合稳定后采集到 1。在此过程中触点会产生弹跳，后才能达到稳定状态，在此期间单片机采集到的数据或为 0 或为 1。设定单片机的采样周期为 0.01ms，由单片机采集到的数据的地址值乘以采样周期，即为所求动作时间。
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直流接触器作为应用广泛的电气开关之一，其生产和需求数量巨大，在正常使用过程中，电磁铁线圈一直通电工作，产生电磁吸力，保证铁芯和衔铁吸合，带动动、静触头闭合，接通电路。在上述过程中，线圈本身存在电阻，持续消耗电能，这是直流接触器主要的使用成本之一，浪费了大量的能源和财产，因此，如何降低直流接触器的工作耗能，是研究直流接触器的关键点和重难点。直流接触器永磁操动机构是一种在传统直流接触器电磁操动机构基础上发展而来，将电磁操动机构和永磁铁相结合的混合型操动机构，不单单使用原有的电磁吸力和弹簧反力作为铁心吸合与分离的动力，而是加入了永磁铁对铁心的吸引力，采用储能电容充放电提供合闸、分闸电力，通常称之为“电磁操动，永磁保持，电子控制”。在分、合闸运动过程中，电磁吸力，永磁吸力与弹簧作用力共同作用，在稳定工作过程中，采用永磁吸力代替之前的电磁吸力，保持衔铁与铁芯心的吸合状态。一则，永磁操动机构大量节约了保持线圈的电能消耗，环保节能。二则，永磁体保持吸合与电磁吸合相比，噪音低，无污染。三则，永磁操动机构剔除了电磁机构中一系列复杂繁琐锁扣保护装置，大大提高了接触器操动机构的工作可靠性，降低了生产工序和成本，减小了接触器的体积。 [1]
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