Fast Efficiency Optimization Control Based on Orthogonal Current Phasor Model for Linear Oscillatory Motor

As the key power part of the linear compressor, the linear oscillatory motor (LOM) has been paid more attention by both academia and industry recently for its compact size, high efficiency, low vibration, etc. In practice, the efficiency of LOM is significantly impacted by the changes in load parameters, of which the best working point can be tracked by the resonant frequency tracking control (RFTC). However, the traditional RFTC with the idea of stroke-current phase suffers some problems, such as slow tracking speed, low accuracy, fluctuate amplitude of piston, and so on. In this article, a novel fast efficiency optimization control algorithm based on the orthogonal current phasor model is proposed for LOM. This new model can achieve the decoupling of current components that act on piston stroke and system efficiency, respectively. Moreover, the driving frequency can be adjusted by current decoupling control with a designed phase-locked loop. Based on the aforementioned, the decoupling control of the LOM drive system can be achieved, which can simultaneously improve the system response speed and the output efficiency. Comprehensive simulation and experimental results have fully demonstrated the advantages of the proposed method.