Performance Control of the Commutator-and-brush Assembly of the Traction Motor

Shantarenko, Sergey; Ponomarev, Evgeniy; Vaganov, Alexander

doi:10.1016/j.trpro.2021.02.139

Cited by 2 publications

(1 citation statement)

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“…The starter-generator is an important part of the aircraft electrical system. The role of the starter-generator is to start the engine and generate electric energy during flight [21]. Using the same machines as generators and engines follows, e.g., from economic concerns.…”

Section: Importance Of the Starter-generatormentioning

confidence: 99%

Reliability Assessment of Aircraft Commutators

Wawrzyński

Zieja

Michalski³

2021

Energies

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The article describes the method of predicting the reliability and durability of an aircraft commutator, which is a primary source of electric energy in helicopters. Tests were conducted for 10 starter-generators. From this research it follows that the technical condition of brushes and bearings has a significant impact on the reliability of starter-generators. The reliability of starter-generators was determined based on the method consisting of two stages that was adopted: the first stage involved determining the density function of changes in diagnostic parameter depending on the operating time, but the second stage included the assessment of the reliability of bearings of the starter-generator taking into account the real flight profile. The first stage of the adopted method consisted of defining the dynamic model of changing the length of the starter-generator’s brush, which became the probabilistic model. Subsequently, based on differential equations, Fokker–Planck partial differential equation was derived, which describes the process of increasing the brush wear in a probabilistic way. This method enables the prediction of the residual durability of the helicopter’s starter-generator due to the change in a diagnostic parameter which is the wear of brushes during starter-generator operation. The second stage of this method allows determining the durability of starter-generator’s bearings building upon the average helicopter’s flight profile. Owing to the difficulty in measuring the wear of bearings, the relation between the durability of bearings and the temperature of surroundings can be applied by replacing the flight altitude with temperature. The reliability of the helicopter’s starter-generator was determined based on the serial-type reliability structure.

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Section: Importance Of the Starter-generatormentioning

confidence: 99%

Reliability Assessment of Aircraft Commutators

Wawrzyński

Zieja

Michalski³

2021

Energies

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Liquid metal sliding contacts for electric machines

Egorov

Kaizer

Lysyannikov

et al. 2021

J. Phys.: Conf. Ser.

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The electric sliding contact in the brush mechanism is one of the most unreliable components of electric machines of alternating and direct current and other electrical equipment in which the transmission of electric current is carried out using sliding contacts that require fairly frequent maintenance and can be a source of sparking. It is possible to increase the reliability and efficiency of electric machines with sliding electric contacts by replacing the dry friction mode with the liquid friction mode in the sliding electric contact. The most appropriate material for use in the construction of a liquid metal sliding contact is gallium. When replacing the sliding electrical contacts of asynchronous electric machines with a phase rotor from traditional solid to liquid metal gallium, it is possible to increase their power up to 1.4 times due to the availability of a higher thermal operating mode.

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Performance Control of the Commutator-and-brush Assembly of the Traction Motor

Cited by 2 publications

References 0 publications

Reliability Assessment of Aircraft Commutators

Reliability Assessment of Aircraft Commutators

Liquid metal sliding contacts for electric machines

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