静止クレーマ方式の等価回路

概要

論文の詳細を見る
The Kramer system is constituted with a Graetz connection rectifier and a separately excited D. C. motor in the secondary circuit of the wound-rotor induction motor. In this Kramer system the secondary current of the induction motor is distorted by the rectifying action. Therefore the current must be treated as an equivalent sinusoidal wave in introducing the equivalent circuit of the system. The imaginary three phase ideal transformer is inserted between the A. C. and the D. C. circuit, and it is assumed that its voltage ratio is π/√^3<2> : 1 and the imaginary equivalent power factor at its primary side is cosφ and the secondary quantities (included the rectifier and D. C. motor) is referred to primary on the base of power invariance. Thus the approximate equivalent circuit of the Kramer system is obtained. This imaginary equivalent power factor cosφ is unable to determine lagging or leading theoretically. But it is known that cosφ is to be lagging p. f. by comparing the calculated results with the measured results. Furthermore, in order to take into account the effect of overlapping angle, if according to the load a proper correction factor k(u) is assumed and the turn ratio of the ideal transformer is improved from π/√^3<2> : 1 to π/k(u)√ ^3<2> : 1,the introduced equivalent circuit will be more useful and reliable than the former.
山梨大学の論文
1967-12-20