压缩机用直线振荡电机频率跟踪控制

Frequency Tracking Control of Linear Oscillation Motor for Compressor

作为一种新型压缩机,直线压缩机具有效率高、体积小、噪声和震动小的优势,但要发挥其效率高的优点,需对驱动频率进行控制,以跟踪其机械谐振频率。针对该特性,提出了一种基于二阶广义积分器(SOGI)和双相关相位检测算法的直线振荡电机频率跟踪控制算法。该控制算法与基于位移电流积平均值(ASCP)的频率跟踪控制算法相比,具有动态响应快、变工况下运行稳定的优点,且增强了对外界干扰的抑制效果,提高了控制系统的稳定性。仿真和实验表明,所提出的控制算法可以快速跟踪电机固有频率,验证了理论的合理性和有效性。

As a new type of compressor,linear compressor has the advantages of high efficiency,small volume,low noise and little vibration.However,in order to give full play to its advantages of high efficiency,it is necessary to control the driving frequency to track its mechanical resonance frequency.According to this characteristic,a frequency tracking control algorithm of linear oscillation motor based on second-order generalized integrator(SOGI)and double correlation phase detection algorithm was proposed.Compared with the frequency tracking control algorithm based on the average value of stroke-current product(ASCP),the control algorithm has the advantages of fast dynamic response and stable operation under variable working conditions,enhances the suppression effect of external interference and improves the stability of the control system.Simulation and experiments show that the proposed control algorithm can quickly track the natural frequency of the motor,which verifies the rationality and effectiveness of the theory.