Abstract
This paper presents a novel analytical method (NAM) of inductance identification for a direct drive permanent magnet synchronous motor (DDPMSM) with a stator winding fault (SWF), which considers the spatial position of the shorted turns. First, the structure of the DDPMSM is introduced and its key parameters are reported. Second, the NAM on the inductance identification is elaborated. The inductance analytical expressions of the faulty coil are derived in detail, in which the inductances of the faulty coil and the fault branch can be quickly calculated according to the spatial position coordinates of fault turns. Then, the model of DDPMSM with SWF is established. Finally, using the NAM, finite-element method (FEM), and the simplified analytical method (SAM), the inductances of the faulty coil and the branch are calculated under different fault conditions. Additionally, the fault current of the faulty coil is also studied, where the value of the fault current reflects the fault severity. The comparisons among the FEM, NAM, and SAM show that the accuracy of the NAM is higher than that of the SAM.
Highlights
The direct drive permanent magnet synchronous motor (DDPMSM) has the merits of high torque density, high efficiency, and high power factor, suitable for electric propulsion applications, such as in aerospace, robotics, electric vehicles, and so on [1,2,3]
Numerous methods reported in the literature on the inductance identification can be divided into four categories: the multi-loop method (MLM), the equivalent magnetic network method (EMNM), the winding function method (WFM), and the finite element method (FEM)
The circuit loop distributions are different under different fault conditions
Summary
College of Electric Engineering, Zheng Zhou University, Zheng Zhou 450001, Henan, China
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