A Study of Practical Application on the Phase Conversion Transformer Using a Rotating Magnetic Field

改善半导体功率变换器波形畸变的基本方法之一是构造多相或多相电源系统。多相电力系统通常需要大量的变压器，随着相数的增加，变压器的数量也随之增加。为了改善这种缺点，实现一机多用的电力系统，作者研制了旋转磁场换相变压器。采用适合于工厂生产的工艺制作了小容量的试用换相变压器，并进行了以下课题的检验。(1)变压器的基本特性；(2)试验变压器应用于具有畸变电流负载的配电系统时的一次负载电流波形；(3)试验变压器应用于构建三相多路逆变器时的输出波形。实验结果表明：(1)试验变压器虽采用分离硅钢片组装，但励磁电流较小。由此可以生产出实用的相变变压器。(2)为了减少电力系统的谐波畸变，我们可以将该换相变压器用于办公楼的电力变压器，例如。(3)我们可以利用该换相变压器在装置上构造三相正弦波逆变器。除大型电力系统外，通常不使用相数较大的多相或多相电力系统，但使用旋转磁场式换相变压器，我们可以用一台设备轻松地构建多相或多相电力系统，而不考虑相数，因此从这个角度来看，可以说这种换相变压器适用于小型电力系统。

One of the basic method to improve waveform distortion of a semiconductor power converter is to construct a polyphase or multiple power system. Generally, the polyphase power system needs a large number of transformers, and as the number of phases increases, the number of transformers increases too. To improve the weakness and construct a polyphase power system with one apparatus, the phase conversion transformer using a rotating magnetic field was developed by authors.The trial phase conversion transformer of small capacity was made with the process which is suitable for production in a factory, and was examined on the following subject. (1) Fundamental characteristic of t he transformer, (2) Primary load current waveform when the trial transformer was applied to a distribution system with distorted current load, (3) Output waveform when the trial trasformer was applied to construct a three-phase multiple inverter.The results of these experiment are as follows: (1) Although the trial transformer was assembled using separated silicon steel plates, exciting current was small. Thus we can produce practical phase conversion transformers with the process. (2) To reduce harmonic distortion of a power system, we can utilize this phase conversion transformer for the power transformer used for an office building, for example. (3) We can utilize this phase conversion transformer for the apparatus to construct three-phase sine-wave inverter.Polyphase or multiple power system that the number of phases is large don't be used usually, except for large power system, but using rotating magnetic field type phase conversion transformer, we can construct easily polyphase or multiple power system with one apparatus, regardless of the number of phases, therefore from this view point one may say that this phase conversion transformer is suitable for small power system.