Thermal Stability of Integrated Electrical Machines

One of the critical areas in the development of aviation electrical machines is to ensure the temperature stability of integrated systems while increasing the generated power, reliability and specific indicators. Compliance with these criteria is the basis for the formation of critical requirements for the implementation of structural elements and applied technological solutions. Critical technologies caused by deviation from classical solutions are often the basis for technological development. The article analyzes the factors of temperature imbalance inside the cavity of an aircraft engine when considering the conditions for integrating a starter generator based on a synchronous electromechanical converter (SEC) containing high-coercive permanent magnets (HCPM) on the rotor held by a composite bandage. Taking into account the temperature parameters of the converter itself, heat flows inside the aircraft engine, it can be seen that the most unstable element of the whole system is the carbon fiber bandage, the performance of which directly depends on the temperature parameters of the coupled elements and mechanical stresses exerted on it. Thus using available materials carbon fiber bandage, magnets SmCo and steel 2421 it is quite possible to design an integrated starter-generator on the basis of synchronous electromechanical converter with power up to 300 kW having losses up to 25% at the heaviest mode of operation.