| 摘要 |
Control means is provided, in which the whole of the phase difference of a power waveform of each phase is matched to a value dividing a cycle of the power waveform into n-equal portions, and at the same time, the whole of the power value of each phase is controlled to be identical, so that the power conversion unit having a n-alternating current output (n is an integer numeral serving as n>=2) connected to the direct current power source and smoothing means provided between the direct current power source and the power conversion unit are made small in capacity.
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