対称内鉄形零相回路をもつ鉄共振形周波数逓倍器

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Magnetic frequency triplers have a configuration with star-connected primary windings and opendelta-connected secondary windings of three single-phase saturable reactors. Most devices used in the field of industry have output windings providing for each of the three saturable reactors (called the “separate core type”).The authors have proposed a frequency tripler (called the “T-shaped core type”), which has the cores combined into a T-shape and the output windings tied up into a bundle, and with this have proved that high efficiency comparable to that of large unit can be realized even in small units by reducing the length of the output windings to about 57% of that in the separate core type. However, due to a magnetic circuit imbalance, the T-shaped core type had the disadvantage of causing a two step jumping phenomenon, which limits the operating range of the device.In the present paper, a new frequency tripler (called the “symmetrical core type”), whose cores are combined into a Y-shape, has been tested, analyzed, and reviewed. The operation of the devices were analyzed by the harmonic balance method taking count of the magnetic circuit imbalance and the resistance component of the windings. As a result, it is shown that operating characteristics can be improved by adopting the symmetrical core type. The results obtained from this paper will offer useful data to the design and operation of symmetrical core type frequency triplers.
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対称内鉄形零相回路をもつ鉄共振形周波数逓倍器

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