关键词: 直接转矩, 定子电阻, 定子磁链, 模糊神经网络

Abstract: The key problem of direct torque control technology is how to acquire the stator flux linkage accurately when the stator resistance is uncertain. In this paper, taking the method of rotor flux orientation, and deducing the expression of slip, this expression contains the information of the stator resistance. As the stator resistance is changing, the slip of the calculation and the actual slip is not equal. The fuzzy neural network is constructed based on this idea, and the gradient descent method is used to train network parameters. It implements the online identification of the stator resistance. For the mentioned methods in this paper, a simulation is done in matlab/simulink. The results are that this method can accurately and quickly follow the change of the stator resistance under the condition of the stator resistance interference. Therefore, it realizes stator resistance real-time adjustment and improves motor’s low speed performance.

Key words: direct torque control, stator resistance, stator flux, fuzzy neural network