Abstract
In this paper, a 15 KW in-wheel motor (IWM) is taken as the research object, and the coupling factors among the electromagnetic field, temperature field and flow field are analyzed, and the strong and weak coupling factors between the three fields are clarified, and by identifying the strong and weak coupling factors between the three fields, a three-field coupling analysis model for IWM with appropriate complexity is established, and the validity of the model is verified. In a certain driving condition, the electromagnetic field, temperature field and flow field characteristics of IWM are analyzed with the multi-field coupling model. The result shows that, after the IWM runs 8440 s under driving conditions, in this paper, the IWM electromagnetic torque of the rated working condition is 134.2 Nm, and IWM the electromagnetic torque of the peak working condition is 451.36 Nm, and the power requirement of the motor can be guaranteed. The highest temperature of the IWM is 150 °C, which does not exceed the insulation grade requirements of the motor (155 °C), the highest temperature of the permanent magnet (PM) is 65.6 °C, and it does not exceed the highest operating temperature of the PM, and ensures the accurate calculation of components loss and the temperature of the motor. It can be found, through research, that the electromagnetic torque difference between unidirectional coupling and bidirectional coupling is 3.2%, the maximum temperature difference is 7.98% in the three-field coupling analysis of IWM under rated working conditions. Therefore, it is necessary to consider the influence of coupling factors on the properties of motor materials when analyzing the electromagnetic field, temperature field and flow field of IWM; it also provides some reference value for the simulation analysis of IWM in the future.
Highlights
As an important part of the electric vehicle drive system, it is necessary to accurately analyze the electromagnetic characteristics, temperature characteristics and flow field characteristics of the in-wheel motor (IWM)
The core loss, copper loss and permanent magnet (PM) eddy current loss of IWM are calculated by an electromagnetic field, the loss is used as a heat source to calculate the highest temperature of each component, and the simulation analysis of the flow field is carried out to make the IWM dissipate heat
It can be seen from the above references, at present, that in the simulation analysis of IWM at home and abroad, coupling factors are not considered comprehensively, and it is not based on a driving condition analysis, which makes the simulation results inaccurate
Summary
As an important part of the electric vehicle drive system, it is necessary to accurately analyze the electromagnetic characteristics, temperature characteristics and flow field characteristics of the in-wheel motor (IWM). Ding Shuye et al took a 1.5 MW doubly-fed wind generator as the research object, and established a three-dimensional finite element model, the fluid field and temperature field in the generator coupled by the finite volume element method, and the velocity and flow distribution of the cooling air in the flow area were obtained [17] It can be seen from the above references, at present, that in the simulation analysis of IWM at home and abroad, coupling factors are not considered comprehensively, and it is not based on a driving condition analysis, which makes the simulation results inaccurate. A three-field coupling model is established, the correctness of the model is verified, and under the condition of acceleration, uniform, climbing and deceleration conditions, a coupling analysis of the multi-physical fields is carried out for IWM
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