CALCULATION OF ASYNCHRONOUS SHORT-CONTAINED ENGINE WITH TWO-ROLLER ROTOR

Abstract

The use of asynchronous electric drive on modern ships is due to its high reliability, ease of use, high economic performance. At the same time, a relatively low starting torque and a significant starting current makes it difficult to use it in ship’s power systems and mechanisms. The most suitable for these drives are asynchronous engines with improved start characteristics, which can be divided into two groups: engines based on the effect of squeezing the current into the groove of the rotor and engines based on the ferromagnetic rotor. In the first group it is possible to allocate deep-and-double engines and engines with a double whitening cage, widely used in lifting ship mechanisms. The second group includes engines with ferromagnetic rotors: with a massive, massive membrane and a two-layer rotor. Among the latter one can distinguish engines with a two-layer rotor, which successfully combine high starting characteristics (high torque and relatively low multiplicity of starting current) and good performance in the part of efficiency and power factor, characteristic of asynchronous motors with a short-circuited cell. The proposed method of calculating the parameters of engines with a two-layer rotor allows to optimize the thickness of each of the rotor’s layers, to calculate the starting and performance characteristics.