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Diagnosing of electro-mechanical converters by using a method of frequency modulation analysis

Gębura A., Tokarski T.

Journal of Polish CIMAC

2012

Vol. 7, no 2

31-43

This paper describes methods for the diagnosing of aircraft electro-mechanical converters, used by the Aircraft Equipment Laboratory , Avionics Division , Polish Air Force Technical Institute ( PAFTI). Each of them has been discussed on the basis of systematized, available theoretical knowledge verified by using results of the authors’ laboratory research. Especially is exposed the diagnostic method , elaborated by these authors and implemented under their supervision, based on measuring and analyzing the parameters of one of the components of the direct current pulsations. The method is called FAM-C ( where FM stands for frequency modulation , A – alternating current, C – the method’s development level). Also, a related method based on measuring and analyzing one of the components of DC pulsations , is presented. It is called FDM-A (where FM stands for frequency modulation, D – direct current, A – the method’s development level ). Results of laboratory tests are also attached. Possible using the converter groove pulsations during rotor’s rundown phase after external feeding the excitation winding, has been also discussed – in this case DC motor turns into DC generator. This makes it possible to apply the FDM-A method. As DC generator usually shows a few times greater resolving power, it is possible to monitor mechanical elements which generate higher frequencies. To highlight the problem, have been discussed effects of physical phenomena which influence the forming of output voltage pulsation component of DC generators.