变压器（Transformer）是一种利用电磁感应原理来改变交流电压的设备，主要部件是初级线圈，次级线圈和铁芯（磁芯）。 主要功能有：电压变换，电流变换，阻抗变换，隔离，稳压（磁饱和变压器）等。它可分为电力变压器和特殊变压器（电炉变压器，整流变压器，工频试验变压器，电压）调压器，采矿变压器，音频变压器，中频变压器，高频变压器，冲击变压器，仪表变压器，电子变压器），电抗器，变压器等）。 电路符号通常使用T作为数字的开头。 示例：T01，T201等
输出电抗器：当从逆变器到电动机的电缆输出长度大于产品的规定值时，应增加一个输出电抗器，以补偿电气时耦合电容的充电和放电的影响电缆正在运行，以避免逆变器流动。 输出dv / dt电抗器：为了限制逆变器输出电压的上升速度，以确保电机绝缘正常。 正弦波滤波器：使逆变器的输出电压和电流接近正弦波，降低电机的谐波域系数和电机的绝缘压力。 这些选件应安装在变频器的输出侧。
以下是产品型号及其介绍：
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4NC5112-0BC20；4NC5112-0CB21；4NC5112-2BC20；4NC5112-2CB21；4NC5113-0BC20；4NC5113-0CB21；4NC5113-2BC20；4NC5113-2CB21；4NC5115-0CC21；4NC5115-2CC21；4NC5117-0CC21；4NC5117-0DA21；4NC5117-2CC21；4NC5117-2DA21；4NC5121-0CC21；4NC5121-0DC21；4NC5121-2CC21；4NC5121-2DC21；4NC5121-2FA21；4NC5122-0CE21；4NC5122-0DE21；4NC5122-2CE21；4NC5122-2DE21；4NC5122-2FC21；4NC5123-0CE20；4NC5123-0CE21；4NC5123-0DE21；4NC5123-2CE20；4NC5123-2CE21；4NC5123-2DE21；4NC5123-2FC21；4NC5124-2FE21；4NC5125-2FE21；4NC5126-2FE21；4NC5222-0CE21；4NC5222-0DE21；4NC5222-2CE21；4NC5222-2DE21；4NC5223-0CE21；4NC5223-0DE21；4NC5223-2CE21；4NC5223-2DE21；4NC5224-0CE20；4NC5224-0CE21；4NC5224-0DE21；4NC5224-2CE20；4NC5224-2CE21；4NC5224-2DE21；4NC5225-0CE21；4NC5225-0DE21；4NC5225-2CE21；4NC5225-2DE21；4NC5227-2FE21；4NC5228-2FE21；4NC5231-2FE21；4NC5232-2FE21；4NC5325-0CE20；4NC5325-0CE21；4NC5325-0DE21；4NC5325-2CE20；4NC5325-2CE21；4NC5325-2DE21；4NC5326-0CE21；4NC5326-0DE21；4NC5326-2CE21；4NC5326-2DE21；4NC5327-0CE21；4NC5327-0DE21；4NC5327-2CE21；4NC5327-2DE21；4NC5328-2CE20；4NC5330-0CE21；4NC5330-0DE21；4NC5330-2CE21；4NC5330-2DE21；4NC5331-2DE21；4NC5431-0CH20；4NC5431-0CH21；4NC5431-0DH21；4NC5431-2CH21；4NC5431-2DH21；4NC5432-0CH21；4NC5432-0DH21；4NC5432-2CH21；4NC5432-2DH21；4NC5433-0CH20；4NC5433-0DH21；4NC5433-2CH20；4NC5433-2DH21；4NC5434-0CH21；4NC5434-2CH20；4NC5434-2CH21；4NC5435-0CH21；4NC5435-0DH21；4NC5435-2CH21；4NC5435-2DH21；4NC5436-2DK21；4NC5438-0CJ21；4NC5438-2CJ21；4NC5438-2DL21；4NC5440-0CJ21；4NC5440-2CJ21；4NC5440-2DM21；4NC5441-2CN21；4NC5441-2DN21；4NC5923-5LT21；4NC5925-5LT21；4NC5930-5LT21；4NC5940-5LT21；
7KT1223；7KT1222；7KT1260；7KT1542；7KT1548；7KT9030；7KT1546；7KT1545；7KT1543；7KT1540；7KT1242；7KT1238；7KT1900；7KT1664；7KT1666；7KT1533；7KT1668；7KT1236；7KT1662；7KT1682；7KT1531；7KT1673；7KT1233；7KT1671；7KT1665；7KT1907；7KT1667；7KT1530；7KT1908；7KT1661；7KT1663；7KT1681；7KT1672；7KT1670；7KT1652；7KT1654；7KT1656；7KT1110；7KT1120；7KT1200；7KT1651；7KT1653；7KT1655；7KT1202；7KT1201；7KT5600；7KT5823；7KT5833；7KT5822；7KT5821；7KT5801；7KT1255；7KT5500；7KT1254；7KT9010；7KT9011；7KT5812；7KT5814；7KT5811；7KT5601；7KT5602；7KT5603；7KT5604；7KT5802；7KT5803；7KT5804；7KT5806；7KT5807；7KT5505；7KT5501；7KT5502；7KT5503；7KT5504；7KT9000；7KT9021；7KT9020；
工作准则：
变压器由铁芯（或磁芯）和线圈组成。 线圈具有两个或多个绕组。 连接到电源的绕组称为初级线圈，其余的绕组称为次级线圈。 它可以转换交流电压，电流和阻抗。 最简单的铁芯变压器由软磁材料制成的铁芯和覆盖铁芯的两个匝数不同的线圈组成。
铁芯的作用是加强两个线圈之间的磁耦合。 为了减少铁中的涡流和磁滞损耗，铁芯由叠层硅钢板制成。 两个线圈之间没有电连接，并且线圈由绝缘的铜线（或铝线）制成。 连接到交流电源的一个线圈称为初级线圈（或初级线圈），连接到电器的另一个线圈称为次级线圈（或次级线圈）。 实际的变压器非常复杂，不可避免地存在铜损（线圈电阻发热），铁损（铁芯发热）和漏磁（被空气封闭的感应线）等。为了简化讨论，仅这里介绍理想的变压器。 建立理想变压器的条件是：忽略漏磁通，忽略初级和次级线圈的电阻，忽略铁芯的损耗，并忽略空载电流（次级线圈初级线圈中的电流）线圈断开）。 例如，当电力变压器满负荷运行时（次级线圈输出额定功率），它接近理想变压器。
变压器是使用电磁感应原理制造的静电电器。 当变压器的原始线圈连接到交流电源时，铁芯中会产生交变磁通，通常用φ表示。 初级线圈和次级线圈中的φ相同，并且φ也是简单的谐波函数。 表格为φ=φmsinωt。 根据法拉第电磁感应定律，初级线圈和次级线圈中的感应电动势分别为e1 =-N1dφ/ dt和e2 =-N2dφ/ dt。 在公式中，N1和N2是初级线圈和次级线圈的匝数。 可以看出，U1 ＝ -e1并且U2 ＝ e2（原始线圈的物理量由下标1表示，并且次级线圈的物理量由下标2表示）。 = N1 / N2，称为变压器的变压比。 根据上式，U1 / U2 = -N1 / N2 = -k，即变压器初级和次级线圈电压的有效值之比等于其匝数比和初级与次级线圈之间的相位差电压为π。
进一步得出结论：
U1 / U2 = N1 / N2
在可以忽略空载电流的情况下，存在I1 / I2 = -N2 / N1，即，初级和次级线圈电流的有效值与匝数成反比，并且相位差为π。
依次可用
I1 / I2 = N2 / N1
理想变压器的初级和次级线圈的功率等于P1 = P2。 它表明理想的变压器本身没有功率损耗。 实际的变压器总是有损耗，其效率为η= P2 / P1。 电力变压器的效率非常高，高达90％以上
特性参数：
工作频率
变压器铁芯损耗与频率有很大关系，因此应根据使用频率进行设计和使用。 该频率称为工作频率。
额定功率
在规定的频率和电压下，变压器可以长时间工作，而不会超过规定温升的输出功率。
额定电压
指允许在变压器线圈上施加的电压，在操作过程中该电压不得大于规定值。
电压比
指变压器一次电压与二次电压之比，空载电压比与负载电压比之间存在差异。
空载电流
当变压器的次级线圈断开时，初级线圈仍具有一定的电流。 电流的这一部分称为空载电流。 空载电流由励磁电流（产生磁通量）和铁损电流（由铁心损耗引起）组成。 对于50Hz的电源变压器，空载电流基本上等于励磁电流。
负载损失
指变压器次级断开时在初级测得的功率损耗。 主要损耗是铁心损耗，其次是空载电流损耗（铜损耗）对初级线圈的铜电阻的影响，这部分损耗很小。
效用
指的是次级功率P2与初级功率P1之比的百分比。 通常，变压器的额定功率越大，效率越高。
绝缘电阻
它表示变压器每个线圈之间以及每个线圈与铁芯之间的绝缘性能。 绝缘电阻的水平与所用绝缘材料的性能，温度水平和湿度有关。
