CHARACTERISTICS OF ASYNCHRONOUS MACHINE IN SPEED CONTROL MODES
The article considers approaches to the analysis of asynchronous machine equations in transients. A method of investigation that provides the possibility of obtaining an analytical expression of the velocity in an arbitrary range of sliding changes is presented. We estimate the applicability of small parameter methods, second-order Voltaire integral equations, and Lagrange equations for reducing the complexity of the solution with respect to acceleration while ensuring accuracy. It is proved that the obtained equations of transient parameters indicate that the acceleration effect is insignificant at low speed values. We consider the interpretation of the physical side of education torque, showing that the components of the magnetizing forces having the same phase points do not create; when determining the moments is required to account for components with different shifts (variations of the initial phases of the difference frequency changes of currents); in determining the moments coordinate axes, relative to which the position is determined by the magnetizing force, arbitrary. The relationship between the nature of the magnetizing force of the stator and the mode of operation of the asynchronous machine (with advanced magnetization, there is a motor mode, lagging - generator mode) is established. The differential equation of the balance of moments acting on the rotor shaft of an asynchronous machine in transient modes is investigated and the problem of determining the rotor speed, including supersynchronous speeds, is solved.