To increase the possibilities of application of alternating current electric drives with various control systems, including those mechanisms where the installation of a tachogenerator is inadmissible or undesirable, the Department of Electrical Machines and Automated Drive of LMI has developed a device that allows indirectly determine the speed of rotation, as well as the components of the stator and rotor flux-coupling of the induction motor (IM).
When organizing the control of the drive thyristor frequency converter - induction motor (TFC-AD) with sufficiently high speed, wide range of speed control and good economic indicators it is necessary on the basis of information about the coordinates of the AD state to form control actions on the frequency and voltage channels of TFC in accordance with certain algorithms.
The development of theory and practice of adjustable AC electric drives on the basis of valve frequency converters contributes in recent years to the wide implementation of such drives in various industries.
Synthesis of a transient control system in a frequency-controlled asynchronous drive directly from equilibrium equations ...
At present, methods of determining the parameters of synchronous machines (SM), based on the experience of damping of direct current in the stator windings are becoming increasingly common ...
In certain cases involving the mechanisation of maintenance and auxiliary operations related to ball mills, direct frequency converters with a limited output frequency range are employed. These operate in short-term duty modes that do not require optimal converter output voltage waveform or high precision in maintaining thyristor firing angles. On the other hand, such devices typically must meet enhanced requirements regarding noise immunity and reliability, as they are installed in industrial premises with high levels of electromagnetic interference. ...
The slow-turning device for a ball mill drum, implemented via a thyristor-based direct frequency converter-synchronous motor (DFC-SM) system with a simplified noise-resistant pulse distribution system, accomplishes sequential energisation of the mill motor's stator windings from a DC voltage source in a specific sequence. ...
