Improved method of operating polyphase dynamo-electric machines for motor and generator duties

摘要

831,325. A.C. generators. BRITISH THOMSON-HOUSTON CO. Ltd. Dec. 3, 1956 [Dec. 9, 1955], No. 35440/55. Class 35. A machine has a three-phase winding connected in star for generator operation and delta for motor operation, the rotor winding being connected to a pair of slip rings fed with D.C. for generator operation, the rings being shortcircuited directly or through resistance for motor operation.