A mathematical model of an alternating current machine is considered, which makes it possible to take into account the effect of saturation of the magnetic target in transient and steady-state modes.
Consideration of the saturation of the magnetic system of an electric machine in transient processes can be carried out, relying on the system of differential equations describing the electrical equilibrium of the windings of the phases of the machine.
The preparation of the system of differential equations of electromechanical systems, and even more so the process of transformations to a convenient form for solving on a computer, usually takes much longer than programming and solving (computing) the computer ...
The harmonic signal generator (HGS) is the main unit of the trigonometric analyzer unit, which serves for extraction of unit reference functions - directional cosines of the rotating coordinate system, rigidly connected with the flux ...
The original scheme of the control system, designed, according to the authors of this scheme, to control the torque of the induction motor, unfortunately, has inaccuracies admitted in the calculations. This has led to an unwarranted conclusion about the effectiveness of this control system ...
The use of alternating current machines in the drive, fed from the stator side and from the rotor side, allows you to expand the range of regulation of the rotor speed of the machine. An ordinary asynchronous motor with a phase rotor can serve as an executing machine. In this case, let us call it a dual-powered TIR machine ...
Power thyristor inverter control unit BUI must provide control of the frequency and phase of the output voltage of the autonomous inverter thyristor frequency converter THR using two input three-phase voltage systems. For this purpose, at the output of the unit, must be formed long pulses of control of the inverter thyristors, necessary for a stable and reliable start of the drive ...
Vector control of AC machines differs from conventional frequency drive control systems in that the mutual position of generalised electromagnetic quantity vectors is taken into account when generating control signals (the voltage vector). The rationale for such consideration becomes apparent upon analysing the expressions for electromagnetic torque. ...
Based on the principle of output voltage formation, direct frequency converters are divided into two main types: thyristor-based direct frequency converters with natural commutation (DFC-NC) and thyristor-based direct frequency converters with forced commutation (DFC-FC). In DFC-NC, the output frequency is formed through natural commutation within a half-cycle of the output voltage. ...
The application of variable frequency drives in medium-power hoisting installations enables significant improvement in reliability indicators and enhancement of the system's dynamic characteristics. …
The control of electromagnetic transients in variable frequency drives based on synchronous machines can be achieved by applying vector control principles. The fundamental concept of vector control involves transitioning from natural electromagnetic stator variables - components of the generalised stator current and voltage vectors in stationary stator coordinates - to new variables representing components of these same vectors in rotating coordinate systems. ...
