Tham khảo tài liệu 'process engineering equipment handbook episode 2 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | G-14 Generators Turbogenerators FIG. G-11 Open cooling system. Source Alstom. FIG. G-12 Generator assembly. Source Alstom. Generators Turbogenerators G-15 Pilot exciter Exciter housing Support bearing Pilot exciter stator FIG. G-13 Main exciter. Source Alstom. The pilot exciter is a synchronous generator with permanent magnets on the rotor. The rotor magnets are enclosed in a short-circuited aluminum ring that prevents demagnetization of the poles because of short-circuiting in the stator winding. The stator winding insulation satisfies the requirements for temperature class F 155 C . Openings are provided in the side walls of the housing for cooling air intake and exhaust and for service activities. The support bearing consists of shield bearing insulation bearing and shaft seals. The bearing which consists of a bearing body with white metal lining is insulated from the shield. The shaft seals against oil leakage from the bearing housing consist of a split seal of oil-resistant insulation material. An air extractor is connected to the bearing space to prevent oil leakage through the external seals. Internal shaft seals are provided with sealing caps and the intermediate space is connected to the blocking air from the pressure side of the .
