感应电机无速度传感器调速技术是目前电气传动领域研究的热点问题。针对传统转速估算模型严重依赖电机参数的问题,文章根据转子槽谐波与电机转速基本关系提出一种利用定子电流中转子槽谐波对感应电机进行测速的方法。新方法作为转速估算模型的有效参考与补充,可进一步提高系统性能与可靠性。文章对一台7.5 kW的感应电机进行了实验研究,对比不同负载下电机转速的计算结果与实测结果验证了该方法的正确性。Sensorless speed control of induction machine is a world widely popular topic in the area of electric drive technology. Considering the traditional model based speed estimation very much depends on machine parameters, this paper presents a rotor speed detection method by analyzing the slot harmonics in stator current. As a speed estimation model, the novel method provides an effective reference and a supplement for the sensorless system to improve its performance and reliability. Experimental study was carried out in a 7.5 kW induction machine test rig. By comparing the rotor speed calculation results with the measured results under different loading conditions, the effectiveness of the method is verified.
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