Improvements relating to the dynamic braking of induction motors
Номер патента: GB834330A
Опубликовано: 04-05-1960
Автор(ы): Shafi-Uddin Ahmed Choudhury
Принадлежит: British Thomson Houston Co Ltd
Опубликовано: 04-05-1960
Автор(ы): Shafi-Uddin Ahmed Choudhury
Принадлежит: British Thomson Houston Co Ltd
Реферат: 834,330. Control of A.C. motors. BRITISH THOMSON-HOUSTON CO. Ltd. July 18, 1958 [July 25, 1957], No. 23623/57. Class 38 (3). An induction motor is decelerated by opening contactor 4 to disconnect a high-speed winding 1 and then closing contactor 5 to energize a low-speed winding 2. The contactor 5 has additional contacts 6 which close simultaneously with or before the closure of the other contacts of the contactor to connect capacitors 7 across the terminals of the high-speed winding 1. A braking effect is thereby produced since the high-speed winding is self-excited with lowfrequency currents. In another arrangement, the additional contacts are provided on the contactor 4 and are adapted to connect each of three capacitors across appropriate pairs of phases of the high-speed winding.
Improvements relating to motor speed control systems
Номер патента: GB950724A. Автор: Norman Harry Shaw. Владелец: English Electric Co Ltd. Дата публикации: 1964-02-26.