Abstract
As winding short-circuit faults (WSF) in a direct-drive permanent magnet synchronous motor (DDPMSM) degrade its reliability and may cause serious catastrophes, fault detection and diagnosis for the DDPMSM are necessary. The performances analyses of motor under WSF are the basis of fault detection and diagnosis. An efficient and accurate faulty model is a great tool for evaluating motor performances under various WSF. Hence, this paper proposes a novel physical faulty model (PFM) based on the coil sub-element for the DDPMSM with the WSF. Fault position can be examined by differentiating the inductance and the electromotive force of the coil sub-element. This model can evaluate motor performances under various WSF, especially inter-turn short-circuit fault in different positions of the same slot, without changing the internal structure of model. The faults are set by connecting the desired taps as in the practical motor. First, the structure and parameters of the DDPMSM are reported. Second, the inductance calculation matrix, which considers the spatial position of the fault, is constructed. Then, the proposed PFM is established. The motor performances under various WSF are evaluated. Finally, the results of PFM, finite element model and experiment are compared. The results validate the correctness of the proposed PFM.
Highlights
The direct-drive permanent magnet synchronous motor (DDPMSM) has the advantages of no-mechanical transmission, high power density, high efficiency and low maintenance cost, and is suitable for electric propulsion applications, such as robotics, electric vehicles and so on [1]–[4]
The overall findings indicate that proposed physical faulty model (PFM) can evaluate motor performances under different types of Winding short-circuit faults (WSF), especially inter-turn short circuit fault (ISF) in different position of the same slot
A novel physical fault model based on coil sub-element of DDPMSM is proposed in this work
Summary
The direct-drive permanent magnet synchronous motor (DDPMSM) has the advantages of no-mechanical transmission, high power density, high efficiency and low maintenance cost, and is suitable for electric propulsion applications, such as robotics, electric vehicles and so on [1]–[4]. An efficient and accurate faulty model of the DDPMSM is a great tool for evaluating motor performances under various WSF. FEM considers the influence of spatial harmonics, winding configurations and so on, which can accurately evaluate the motor performances under different types of WSF [13], [14]. MLM, WFT and WPM cannot evaluate motor performances under various WSF, especially inter-turn shortcircuit fault in different positions of the same slot (ASISF), without changing the internal structure of model. A novel physical faulty model based on the coil sub-element is proposed This model can consider the winding configuration and coil position. Motor performances under different types of WSF, especially the ASISF, can be evaluated conveniently and quickly without changing the internal structure of model.
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