Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Sensorless initial position estimation strategy for PMa-SynRM drives based on dual rotating high-frequency signal injection

  • Liu Liu (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China) ;
  • Pan Luo (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China) ;
  • Junjie Zhao (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China) ;
  • Yuechen Rui (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China)
  • Received : 2023.03.27
  • Accepted : 2023.09.15
  • Published : 2023.11.20
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Abstract

The rotating high-frequency (RHF) signal injection method is widely adopted for the initial position estimation in sensorless permanent magnet-assisted synchronous reluctance motor (PMa-SynRM) drives due to its simple implementation. However, the position estimation accuracy of the conventional method may be seriously deteriorated by the dead-zone effects of the inverter and the cross-saturation effects of the machine. Thus, to improve initial position estimation accuracy, a strategy to apply dual RHF signals is proposed in this paper. Different from the traditional solution, the proposed method sequentially injects dual RHF carrier voltages with the same frequencies but different amplitudes into the machine. Objective equations that consider the dead-zone and cross-coupling effects can be extracted from high-frequency response currents in turn. After the simple calculation, the initial position can be obtained directly and accurately, which effectively minimizes the influences of machine cross-saturation and inverter nonlinearities. The influence of the system delay on the rotor position estimation is also analyzed and deduced in detail. Finally, experimental results on a 5.5-kW PMa-SynRM indicate that the proposed method can achieve precise initial position estimation under any rotation position.

Keywords

References

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