| 摘要 |
367,338. Control of D.C. motors. FAY, J. M., 88, Merrion Square, DRUMM, J. J., University College, and CELIA, Ltd., 42, St. Stephen's Green, all in Dublin. Aug. 16, 1930, No. 16330. [Class 38 (iii).] Varying electromotive force.-The motor u in a battery-driven traction system is accelerated by connecting it to various tappings of a subdivided battery I .. XII. At each stage resistance is included in series and is cut-out in steps, and then the effect of the series field u<2> is weakened by increasing in stages the effect of an opposing shunt field u<1>. Thereafter the resistance is reinserted, the next higher tapping of the battery connected in such a way that one step of the resistance is between the two tappings, and then the lower tapping is disconnected and the sequence proceeds as before. The actual tapping and resistance control is performed by an electromagnetic contactor controller r under the control of a master controller s, to which is geared a controller t for the shunt field u<1>. The controller t makes one complete revolution for each stage of the controller s. Regeneration is obtained when the controller s is turned backwards by a lostmotion device causing the series field u<2> to be excluded and the shunt field to be reversed. In order to equalize the discharge of the battery sections I .. XII a controller p is automatically moved one step each time the master controller s is returned to its "off " position. The controller p effects a cyclic change of the connections of the sections I .. XII to the leads a .. m. Further, a controller q normally interconnects the leads a .. m so that the battery sections are in series with tappings taken off by the leads A .. N, but in order to equalize the charge of the sections, it can be moved so as to disconnect them from the leads A .. N and to connect them in parallel for charging. The invention is applicable to the traction system, disclosed in Specification 345,233, [Group XXXV]. |
