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

改善半导体功率转换器波形失真的基本方法之一是构建多相或多个电源系统。通常情况下，多相电力系统需要大量的变压器，而且随着相数的增加，变压器的数量也随之增加。为了改善这一缺点，构建多相电力系统一机多用，作者研制了旋转磁场相变变压器。采用适合于工厂生产的工艺，试制了小容量的相变变压器，并进行了以下试验。(1)试验变压器的基本特性；(2)试验变压器应用于电流负载失真的配电系统时的一次负荷电流波形；(3)试验变压器用于三相多路逆变器时的输出波形。这样我们就可以用该工艺生产出实用的相变变压器。(2)为了减少电力系统的谐波失真，我们可以将这种相变变压器用于例如办公楼的电力变压器。(3)利用该变压器可以构成三相正弦波逆变器，除大型电力系统外，通常不采用相数较多的多相或多相电力系统，但使用旋转磁场型相变变压器，可以方便地用一台装置构成多相或多相电力系统，而不考虑相数的多少，从这个角度来看，这种相变变压器适用于小电力系统。

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.