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EXCITER STATOR

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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 (d) Remove exciter rotor (38). (e) Remove screws (82) and washers (83) to free bearing cap (84) (f) Attach crane or hoist to endbell (85). Remove screws (80) and washers (81).  Remove endbell (85) and PMG stator and exciter stator as a unit. NOTE Tap lightly with rubber or fiber mallet to loosen endbell.  Check for shims in the endbell bearing housing (well).  Make certain shims, when incorporated, are reinstalled when unit is assembled . (g) Remove nut (86) and lockwasher (87). (h) Use a puller to remove the bearing form the shaft. (See figure 11-15.) protect the shaft end with a cap. If bearing is to be used again, make sure puller applies pressure only against the bearing inner ring. (i) Install pipes over generator shaft on the drive and exciter end of rotor.  Attach slings and hoist to pipes and remove rotor assembly (89) from stator and frame (93).  Make certain air gap is maintained between the rotor and stator during removal of the rotor. CAUTION Make certain pipes are of sufficient strength to support weight of rotor and that pipes do not have rough edges which would damage shaft surface. (a) Install pipes over generator shaft on the drive and exciter end of rotor. Attach slings and hoist to pipes and remove rotor assembly (89) from stator and frame (93).  Make certain air gap is maintained between the rotor and stator during removal of the rotor. NOTE Install bearing as described in paragraph 11-9 and PMG and exciter as described in paragraphs 11-6 and 11-7.  Make certain generator armature (stator) and the exciter armature is aligned with the exciter field. (b) Install generator as described in paragraph 11-5. 11-13.  EXCITER STATOR.  The brushless exciter provides excitation current for the generator.  The stator is the stationary field for the exciter assembly. a. Inspect.  Inspect the exciter stator as follows: (1) Inspect for loose, frayed, or burned windings. (2) Inspect frame for cracks and burred mating surfaces. b. Test.  Disconnect all leads on the stator to completely isolate the winding. (1) Using a Wheatstone bridge connected to a field winding, resistance shall be between 10.57 and 10.79 ohms at an ambient temperature of 77°F (25°C). (2) Check insulation resistance with a megohmmeter between winding and frame. Resistance of each winding shall be at least 1 megohm at 77°F (25°C).  If this value is not met, clean or dry out winding, and repeat test.  Replace if defective. 11-31


   


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