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2 2013

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Output Voltage Pulsation as Source of Diagnostic Information About Commutator-Type DC Generators

Gębura A., Radoń T.

Prace Naukowe Instytutu Technicznego Wojsk Lotniczych

2013

nr 33

75--93

The paper deals with operational issues related to DC generators of commutator types. Specific aspects of commutation are discussed in details as well as the effect of physical phenomena onto formation of the constant component in the pulsation waveform of the output voltage supplied by DC generators. The component of pulsation is the result of many physical phenomena and, according to knowledge sourced from the related literature, is split into several components. Each of these components is discussed in systematic way on the basis of theoretical background provided by referenced textbooks and papers and then verified by comparison against results of own research studies carried out in the ITWL laboratory. Particular attention is paid to effects associated with the commutation process, with consideration of symptoms related to failures, possibilities of their detection and prevention. Some other effects associated with variation in the nature of pulsation are discussed as well when defects such as shorts or breaks occur in the generator armature or stator. It has been demonstrated that those components of DC generators can be diagnosed by analysis of parameters in pulsation components.

Diagnostics and Technical Status Monitoring of Electric Fuel Pumps for Aircrafts

Tokarski T., Gębura A.

Prace Naukowe Instytutu Technicznego Wojsk Lotniczych

2013

nr 33

237–252

The paper outlines selected operational problems associated with electric fuel pumps that are indispensable to build-up positive pressure upstream the plunger pump of turbojet engines. Any failure of that electric pump may lead to suction of air into the plunger pump and eventually the engine flameout. Comparison is made between two electric drives for fuel pumps: a three phase 115/208 VG, 400 Hz AC drive and a 26V DC drive. Attention is paid to serviceability of pumps and capacities of the AFIT to diagnose and monitor technical status of electric fuel pumps.