Machinery & Energetics

The operating modes of many electric drives used in the mechanisms of agricultural production are characterized by a random load moment change in a wide range. This also applies to electric drives based on a three-phase asynchronous drives powered by a single-phase network - three-phase single-phase electric drives with adjustable phase-shift modules. The intensive stochastic nature of the perturbation changes significantly decrease the electric drives operation quality: requires excessive installed drive capacity, causes the blows in mechanical parts, engine and network current throws, reduces the quality of consumed energy and increases power losses. It is possible to increase the efficiency and reliability of their work by increasing the overload ability of the electric drive in dynamic modes to overcome the release of random perturbations. The method of overcoming stochastic load torque emissions in three-phase single-phase asynchronous electric drives is proposed due to the use of a discretely adjustable phase-displacement module with a statistically optimal filter. The technique of designing a three-phase one-phase asynchronous electric drive with an adjustable phase separating module is developed, which allows to obtain a symmetric mode in a wide range of load variations with its random nature. Using the algorithm for optimal filtration in closed systems of single-phase asynchronous electric drives allows to provide a minimum dispersion of the asymmetry coefficient and obtain an efficiency close to the efficiency of the engine with three-phase power supply, with intense change of stochastic loads.

asynchronous electric drive, phase- shift module, stochastic load