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http://dx.doi.org/10.21289/KSIC.2018.21.6.439

Performance Improvement of High Speed Operation for Sensorless based Synchronous Machine  

Jung, Young-Seok (Department of Mechanical Design Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Industry Convergence / v.21, no.6, 2018 , pp. 439-444 More about this Journal
Abstract
The performance improvement in the high speed region for the sensorless based synchronous machine drive is discussed in the paper. Conventional dynamic overmodulation method in the vector controlled AC driver requires some calculation of maximum amplitude of the applying voltage vector to limit its amplitude, which leads to increase the calculation time of microprocessor. For low performance microprocessor, this might be impossible to complete the control loop within limited control time. Thus, to reduce the calculation time, the constantly limited amplitude for applying voltage vector is tried in this paper to drive sensorless based synchronous motor. Certainly, there exists some errors in amplitude and phase angle between inverter voltage and calculating voltage in the sensorless algorithm. But, this errors are too small to prevent the high speed sensorless operation within overmodulation region. The validities of the proposed method is proved by the experimental results.
Keywords
Sensorless Control; Synchronous Machine; Overmodulation;
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