Integrated high-temperature starter-generators with intermittent concentrated winding

Аuthors

Ismagilov F. R., Vavilov V. E.^*, Tarasov N. G.^**, Aiguzina V. V.^***

Ufa State Aviation Technical University, USATU, 12, K. Marx str., Ufa, 450008, Republic of Bashkortostan, Russia

*e-mail: s2_88@mail.ru
**e-mail: nikolay.tarasov.1994@yandex.ru
***e-mail: vtipy@mail.ru

Abstract

The main objective of the research is the direct integration of the electric machine such as generator or starter-generator on the low-pressure and/or high-pressure shaft of an aircraft engine, and the gearbox elimination. This will allow reduce the aircraft engine's weight and size figures, as well as improve the aerodynamic efficiency of an aircraft as a whole. This article presents the design and experimental research of the scalable prototype of high-temperature starter-generator with the inner rotor for more electric aircraft. The fundamental difference of the developed generator from the conventional machine consists in no oil ingress into the rotor or stator cavity. The starter-generator is immersed in an aircraft engine oil chamber, containing the oil necessary for bearings lubrication at the temperature of 120-160 °С. The stator and rotor are not lubricated with oil, which does not circulate. Cooling is achieved by losses' heat sink into the surrounding oil. A scalable high-temperature starter-generator prototype model was developed in Ansys Maxwell software package. It revealed a high accuracy and close convergence with the experimental results. Moreover, the system efficiency assessment and computation of losses in starter-generator's elements were performed. Based on the experimental results and computer simulation the starter-generator full-sized model was developed, and tests at the temperature of 120 °С were conducted. This generator appeared to be less loaded from the viewpoint of electromagnetic and thermal loads. It proves the efficiency of the proposed conception and its effectiveness for implementation in more electric aircraft.

Keywords:

starter-generator with intermittent concentrated winding, permanent magnets, direct integration, more electric aircraft

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