Kirichkov A. Advanced thermal model of the temperature protection of the explosion-proof cage asynchronous motor

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0410U001411

Thesis Registration Form

0410U001411.pdf

Applicant for

Specialization

  • 05.09.01 - Електричні машини і апарати

27-01-2010

Specialized Academic Board

К 45.052.01

Essay

The thesis is devoted to increasing the safety and reliability of explosion-proof asynchronous motor's operation by application of the thermal protection, that was implemented by improvement of the thermal mathematical models for the definition of the thermodetector's response temperature. The analysis of references, mathematical and experimental researches has shown, that the existing installation techniques of the thermodetectors on a stator winding and mathematical models for the definition of the thermodetector's response temperature do not allow to create effective systems of thermal protection against quickly and slowly accruing thermal overloads, owing to a presence of the big definition errors of the winding temperature. Occurrence sources of the temperature measurement errors in a thermodetector are detected, instructions and recommendations for their elimination by correct installation of a thermodetector and application of the developed thermal mathematical models for calculation the temperature field of a "stator winding - thermodetector" system are developed. The models are based on the thermal equivalent circuits. Modelling and experimental researches have shown conformity of developed temperature protection to state standard 27888-88 requirements, and have proved a correctness of mathematical models and recommendations, which concerned a thermodetector installation under the ground insulation with additional thermoisolation of a thermodetector from environment.

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