异步电机速度自适应磁链观测器的研究

Research of Speed Adaptive Flux Observer of Induction Motor Under Field Weakening Condition

针对异步电机速度自适应磁链观测器在高速弱磁运行下的特点提出了新的磁链观测器配置方法,克服了传统配置方法下磁链观测器离散后在高速下出现的振荡现象,解决了弱磁条件下速度估计环节增益下降的问题,保证了磁链观测器对转子速度的准确估计和对转子磁链位置的准确观测,验证了异步电机无速度传感器控制在电动汽车应用中高速运行下的可行性。

According to the characters of speed adaptive flux observer of induction motor under the high speed field weakening operation, a configuration method for this observer was proposed. This method over- comes the oscillation situation of observer when the conventional configuration method is adopted in the high speed operation~ it also solves the gain decreasing problem of speed estimator when field weakening applied. The proposed method guarantees the precise estimation of rotor speed and exact observing of rotor flux. The possibility of sensorless control of induction motor applied in the HEV/EV in high speed operation was verified via the test.