| 摘要 |
<p>PURPOSE:To effectively reduce a harmonic current, an equivalent disturbing current by connecting reactors in series with the secondary windings of transformers. CONSTITUTION:Unit rectifiers 21-24 are respectively connected with the secondary windings divided in a plurality of a transformer 1, and connected with each other in a cascade to construct a main rectifier 2 capable of operating as an inverter. A series connection circuit of a smoothing reactor 31 and DC drive motors 411-414, and a series connection circuit of a smoothing reactor 32 and DC drive motors 421-424 is connected in parallel with the output side of the rectifier 2. Further, reactors 51-54 are respectively connected in series with the secondary windings of the transformers 1. The reactances of reactors 51-54 are selected to the value which can sufficiently reduce the harmonic current, equivalent disturbing current and defective current.</p> |
