Electromagnetic performance analysis and thermal research of an outer‐rotor I‐shaped flux‐switching permanent‐magnet motor with considering driving cycles

Abstract

In the operation of electric vehicles (EVs), the driving conditions of frequent acceleration and deceleration, sudden start–stop, heavy load, and hill-climbing are usually required to meet the requirements of the increasing complexity of the modern transportation. Hence, the electromagnetic performance of traction motors in EVs should be investigated considering driving cycles. This study analyses the electromagnetic performance of an outer-rotor I-shaped flux-switching permanent-magnet (I-FSPM) motor with considering driving cycles. Firstly, the electromagnetic performance including the basic no-load characteristics, magnetic field distribution, and torque performances are analysed and compared under three different driving conditions. To analyse the proposed motor considering driving cycles comprehensively, the temperature rise is also calculated. Generally, the temperature rise is related to the loss characteristics. Thus, a loss prediction method considering the driving cycle for an I-FSPM motor is presented, where the New European Driving Cycle is chosen as the sample driving cycle. Also a lumped parameter thermal model is built. The predicted results of the I-FSPM motor are verified by the finite element calculations. Finally, experimental validation is carried out.