基于参数辨识的电动机过载保护原理研究

随着我国科技水平快速发展，感应电机不再仅仅是传统工农业生产中使用最多的电机，也是电动汽车领域和航天科技等热点问题中应用较为广泛的动力源。对此，电机中的过载保护技术也需要越来越智能化。在传统的电阻法过载保护基础上提出了一种更加智能的保护方法，实现了对电机运行时定子电阻的实时辨识，再通过电阻与温度的关系直接推算出电机内部温度。以一台1DPT160M系列的变频调速感应电机为例进行试验，验证了该方法的可行性，为电机保护器的过载保护技术提供了新方法。

Research on Motor Overload Protection Principle Based on Parameter Identification

With the rapid development of science and technology in China, induction motor is not only the most widely used motor in traditional industrial and agricultural production, but also a widely used power source in the field of electric vehicles and aerospace science and technology. Therefore, the overload protection technology in motor also needs to be more and more intelligent. A more intelligent protection method is proposed based on the traditional resistance overload protection, which realizes the real-time identification of stator resistance during motor operation, and then the internal temperature of the motor can be calculated directly through the relationship between resistance and temperature. Moreover, a 1DPT160M series variable frequency speed regulating induction motor is used for experiments to verify the feasibility of the method, which provides a new principle for overload protection technology of motor protector.