OPTIMIZING THE AVIATION ELECTROMECHANICAL DRIVE-GENERATING AGGREGATE KINEMATICS CHOICE

The article continues the aviation electro mechanics drive-generating aggregate structure research and aims to form the recommendations for getting the best possible combination of operating performance of such aggregate. Using the motoring of asynchronous machine on the first stage and the circulation of active-power related to it in the aggregate con- tour require synchronous generator over motoring in proportion to the required shaft speed rotation of the generator. Due to the difficulty to provide the required value of asynchronous machine moment, when starting it with AC or DC, one should give preference to the asynchronous brake (in this case the necessity for the source of direct-current is eliminated and the scheme realization of the mode is simplified). The development of differential asynchronously-synchronous drive- generating aggregate with three generator stages of asynchronous machine allows decreasing the value of synchronous generator electromagnetic power, to provide the high average value of aggregate performance efficiency. Applied to mod- ern turbo-engines which continuous work is only possible at certain fixed rotation speed, the number of generator aggregate operational stages and operation modes of asynchronous machine need to be chosen in order to provide the best possible indexes exactly at these speeds, assuming the relatively large values of losses at brief transient operational modes of aircraft engine. The calculation series results of power performance of aviation electro mechanics asynchronously-synchronous drive-generating aggregate are presented in the article. On the basis of these results the author could give the recommenda- tions for aggregate structure and operational modes choice for asynchronous machine optimization. The development of drive-generating aggregate with three generating steps of the asynchronous machine allows to reduce its specific weight due to the value of estimated electromagnetic power of the synchronous generator.

drive-generating aggregate, an electromechanical system of generating, alternating current of constant frequency, operating mode of the asynchronous machine

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