感应电机定子磁场定向无速度传感器系统研究

Induction motor speed sensorless system using stator flux orientation

根据定子磁场定向原理，建立了感应电机无速度传感器矢量控制结构．利用改进的磁链观测方法，抑制了纯积分器直流偏移和饱和漂移，同时补偿了幅值和相位误差．根据定子磁链处于稳态时，转子电流矢量和转子磁链矢量正交的特点，提出了一种闭环形式的定子电阻在线补偿方法．实验结果表明，磁链观测器能够真实地估算电机定子磁链，速度阶跃给定25r／min时，进入稳态时间约300ms，稳态波动范围为10～30r／min．仿真结果表明本方法给出的定子电阻估算值能够很好地跟踪电阻实际值的变化，系统调速性能大大提高．

The structure of vector control for induction motor speed sensorless based on stator flux orientation was constructed. The direct current offset and saturation drift of pure integrator were restrained, at the same time the magnitude and phase error were eliminated using an improved flux observation method. A close-loop on-line compensation method for stator resistance was presented according to the factual that rotor current vector is orthogonally with rotor flux vector when stator flux is in steady state. It is showed that stator flux can be estimated factually by the flux observation method, speed response can arrive steady state in 30 ms and speed steady-state wave motion will be in 10-30 r/min when speed step reference is 25 r/min by the experimental results. The simulation results show that the stator resistance actual variation can be tracked well by the estimation value and the performance of system speed regulation is improved greatly by using this compensation method.