| 摘要 |
367,133. Master control of D.C. motors. INTERNATIONAL GENERAL ELECTRIC CO., Inc., 120, Broadway, New York, U.S.A.-(Assignees of Allgemeine Elektricitõts-Ges.; 2, Friedrich Karl-Ufer, Berlin.) Jan. 21, 1931, No. 2073. Convention date, Jan. 21, 1930. Addition to 356,104. [Class 38 (iii).] Non-regenerative braking.-In a multiple-unit train control system, the main controller 37 occupies the same positions for braking as for driving. A reverser 34 is under the control of a switch 45 and a switch 35 connects the motor 12 for driving or braking according to the position of the master controller 30. The controller 30 has three running positions corresponding to the motor with full series resistance, without series resistance and with weakened field, the controller 37 being stepped forward automatically under the control of a relay 36 to exclude the series resistance. When the master controller 30 is moved to the braking positions, the switch 35 changes the motor circuit to a braking circuit starting with weakened field and full series resistance, thereafter the controller 37 is returned in steps in accordance with the displacement of the master controller so as to strengthen the field and then exclude series resistance. By using certain tappings of the resistance for accelerating and others for braking, the same resistance can be used with the correct graduation thereof for both functions. Some of the tappings are common to both functions. |
