Comparative analysis of linearized systems of anisochronous variable-frequency drives by means of structural models
DOI:
https://doi.org/10.15587/1729-4061.2012.4613Keywords:
electric drive, designing, linearization.Abstract
The wide application of anisochronous variable-frequency driver for machinery in all fields of national economy at present resulted in the unseen before complete block diagram for this type of the drive in the literary sources in the field of study of electric drive.Diagram 1. It is universal, as the parameters of winding of anisochronous motor are not taken into account.
Diagram 2. The advantage is the accounting of the parameters of a specific anisochronous machine. In addition, the version with the PID loop of speed corresponds completely to the definition of the actual frequency transformers and provides high accuracy of development of the required speed diagram. The comparative disadvantage is small overshoots in the moment curve. If these overshoots do not exceed permissible limits, such diagram may be considered as the basic one.
Diagram 3. Corresponds to the classic scheme of the systems with subordinate control and has the best dynamic indices regardless of the speed regulator type. If the results are to be used in practice, one should take into account, that the frequency transformer with the PID loop is commonly used as the transformers with the finished system of subordinate control are made in small number.
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