Research on magnetic field and temperature field of multi-phase SPMSM under winding fault

In order to quickly and accurately calculate fault-tolerant capability of multi-phase surface-mount permanent magnet synchronous motor (SPMSM) at condition of asymmetrical fault, based on subdomain model, an analytical model for multi-phase SPMSM with asymmetric fault is proposed to calculate magnetic field distribution. Firstly, air-gap flux density, no-load back electromotive force (EMF) and electromagnetic torque are obtained accurately. Then, in order to improve the fault-tolerant capability of multi-phase SPMSM, with the minimum phase current as optimization objective, a fault-tolerant control system under the condition of single-phase winding disconnection is established. The performance of electromagnetic torque and torque ripple are used as evaluation indicators. Finally, taking a 12-phase SPMSM prototype with 44-poles 48-slots as an example, the effectiveness of proposed model is proved by 2D finite element model (FEM) and experiment test. (c) 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).