低成本无位置传感器永磁电机在空调压缩机中的应用

Low Cost Sensor-less Control of PMSM for Air-conditioner Compressor Application

空调压缩机控制系统作为空调系统的核心部分要求具有低成本、高性能、高效率的特点。提出一种永磁同步电机-压缩机无位置传感器控制方案。通过对直流母线电压、电流采样,结合逆变器开关状态实现定子相电压和相电流的重构。根据压缩机通常运行在高速区的特点,采用改进电压模型的反电势积分方法对磁链和转速进行估算,实现了永磁同步电机无速度传感器的矢量控制。对电流采样过程中存在的问题进行了深入的分析,并提出解决方法。实验结果验证了控制方案的可行性,并成功应用于空调系统,在提高系统性能的同时,降低了系统成本。

Compressor control system should have the characteristic of low cost, robust performance and high efficiency as the critical part in air-conditioner system. A complete sensor-less PMSM-compressor vector control scheme was presented. Phase voltage and current are derived from DC voltage,DC current and inverter switching states. A back-EMF integration combined with improved voltage model is used for estimating rotor flux and speed in the high speed region. Detailed analysis was given concerning the specific current sampling problem and the solution was proposed. Experimental results validate the effectiveness of the control method, which is successfully applied in the real air-conditioner system, improving the performance while reducing the cost.