摘要
针对开关磁阻电机重载运行下因饱和电感随电流变化而导致速度和位置估算不准确的问题,提出一种基于六个电感特殊位置点的开关磁阻电机转子位置估算方法,通过非导通相注入电压脉冲及导通相电流获取实时在线计算全周期增量电感信息并获得电感曲线,通过相邻两相电感大小判断输出交点位置角度,低电感区相邻两相电感交点受磁路饱和影响小,输出固定的角度分别为7.5°、22.5°和37.5°;高电感区相邻两相电感交点受磁路饱和影响大,采用5次多项式拟合方法获取交点角度与电流的函数关系,结合实际采样电流计算交点位置,由电感交点位置估算任意时刻电机转速及位置。最后,通过仿真和实验验证了在惯性运行、轻载、重载、负载突变和高速等运行工况下位置估算的正确性。
The speed and position estimations are inaccuracy due to the change in the saturation inductance with the current of switched reluctance motor. A method based on six special inductance intersections is proposed for estimating the rotor position of switched reluctance motor. Full-cycle incremental inductance is calculated and the inductance curve is acquired by the injection voltage pulse that is exerted on the non-conducting phase and conduction phase current. The output intersection angle is determined by the adjacent two-phase inductance. The impacts of magnetic saturation on adjacent two-phase inductance intersection are neglectable at low inductance, and the output angle of the intersection is 7.5°, 22.5° and 37.5° respectively. The intersection of adjacent two inductance at high inductance area is influenced by magnetic saturation, and the intersection polynomial fitting method is used to obtain the relationship between the intersection angle and current function. Intersection position is obtained by the actual sampling current and the speed and position is estimated at any time. Finally, the estimation method is verified at inertial operation, light load, heavy load, load mutation and high speed by simulations and experiments.
作者
蔡辉
王辉
李孟秋
沈仕其
Cai Hui , Wang Hui , Li Mengqiu , Shen Shiqi(College of Electrical and Information Engineering Hunan University Changsha 410082 Chin)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第12期2723-2734,共12页
Transactions of China Electrotechnical Society
关键词
开关磁阻电机
无位置传感器
特殊位置点
磁路饱和
转子位置
Switched reluctance motor
position sensorless
typical location point
magnetic saturation
rotor position
