Scientific and Technical Journal


ISSN Print 2221-3937
ISSN Online 2221-3805

The sensorless vector control system of induction motors at low speed without high-frequency test injection was presented in article. It allows eliminating unwanted energy loss and distortion of the stator currents of machine. The developed system is based on an analysis of zero-sequence current and it is suitable for motor control when windings are connected in delta. Application of the proposed method for estimation the values of the machine speed without using equivalent circuit parameters allows to make the system more robust when operating at low frequencies, since the accuracy of the preliminary parameter estimation and their changing due to the machine heating does not effect on the accuracy of the unmeasured state variables.The proposed method can significantly extend the range of speed control for sensorless vector control system.


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