Research on Electromagnetic Linear Actuator-Driven Compressor and its Control Technology

To address the low efficiency of compressors driven by rotating motors in refrigeration equipment, an electromagnetic linear actuator directly driven compressor is designed. A multi-field coupling mathematical model of machinery, electricity, and magnetism is established through theoretical analysis of the working mechanism and structure of the electromagnetic linear actuator directly driven compressor. Based on MATLAB/Simulink, a dual-loop Proportional—Integral—Derivative (PID) control algorithm and a sliding mode variable structure control algorithm with a nonlinear extended state observer are designed and simulated, enabling the function of the linear compressor to change its stroke and frequency according to different working conditions. Subsequently, a real-time simulation test platform based on dSPACE is built for the semi-physical real-time simulation tests. The test results demonstrate that the control algorithm can meet the variable working conditions of the compressor, and the test results are consistent with the simulation results. Moreover, the accuracy of the sliding mode variable structure control algorithm with a state observer is 2.5%, which is higher than the 5% accuracy of PID, meeting the performance requirements of the compressor.