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of the excitation coil and the electromagnetic moment on the shaft when the excitation current in
the excitation coil is changed. As a result of controlling the magnetic flux of the excitation coil,
not only in the synchronous motor, but also in the source supply of the motor, power losses are
reduced, technical and economic performance is improved, energy saving problems are solved and
dynamic stagnation is expanded.
Adjusting the excitation current in order to increase the stagnation limit of the synchronous
motor ensures that the oscillations of the rotor and the value of the supply source voltage do not
change, depending on the nature of the load on the shaft. Connected to the rapidly changing load
in the power supply of
building materials enterprises, the drive shaft is mounted on a longitudinal
axis, scientific work on the study of synchronous motors was carried out at the Institute of Ural
Polytechnic University. The electromagnetic and electromechanical transitions that occur when a
load is applied to and taken from the shaft of a synchronous motor, when the excitation current is
adjusted according to the loading angle and its derivatives, were analyzed using the Lyapunov / 2
/ function.
The results of experiments on a physical model prepared by the department to analyze the
transition processes of a synchronous motor and calculations based on the Park-Gorev differential
equations by changing the current in the excitation system of a synchronous motor show that the
oscillations of the mode parameters differ significantly from the set values.
The results of the
analytical comparison of the oscillograms obtained and the computational results obtained in the
physical model of the analyzed regime are given in Table 1. As can be seen from Table 1, in the
experiments carried out to improve the transition processes of the synchronous motor in the
physical model, the calculation results obtained from the oscillograms of automatic rectification
of the excitation current and performed using differential equations are one.
1 Table
Option
Experimental
results
Results
of comparison
The excitation current is
not rectified
The
excitation
current is rectified
∆R
max
0,75
0,57
0,71
∆Ɵ
max
0,72
0,71
0,74
In the article, the results of calculations performed without taking into account the magnetic
state of the magnetic system when the excitation current of a synchronous motor is rectified, differ
significantly from the results determined on the oscillograms obtained in the physical model.
