永磁同步电机新型单电阻电流重构技术研究

针对永磁同步电机在单电阻电流采样时,低调制区域和扇区边界区域难以进行电流重构的问题,提出了一种新型单电阻电流重构技术。首先,对三相电流重构技术原理进行研究,定义无法重构的区域为非观测区,对非观测区电流重构盲区进行分析。其次,使用脉冲宽度调制移相法对非观测区的电流进行重构,发现仍有部分非观测区只可测得一相电流,从而无法完成电流重构。针对这一问题,设计电流观测器,通过单相电流来估算三相电流,且不需要电机与负载参数,实现简单。试验验证表明,所提新型单电阻电流重构技术具有可行性和实用价值。

A Novel SingleResistance Current Reconfiguration Technique forPermanent Magnet Synchronous Motor

In order to solve the problem that it was difficult for permanent magnet synchronous motor to reconstruct the current in the low modulation area and the boundary area of the sector when the singleresistance current was sampled, a novel singleresistance current reconstruction technique was proposed. Firstly, the principle of threephase current reconstruction technique was studied, the region in which the current was unable to reconstruct was defined as nonobservation area, and the blind region of current reconstruction in the nonobservation area was analyzed. Secondly, using the pulse width modulation (PWM) shift method to reconstruct the current in the nonobservation area, it was found that there were still some nonobservation areas where only the singlephase current could be measured and the current could not be reconstructed. Aiming at this problem, the current observer without the motor and load parameters was designed to estimate the threephase current, which was easy to implement. Finally, the experimental results showed that the proposed novel singleresistor current reconstruction technique was feasible and valuable.