Multi-physics Analysis And Comprehensive Performance Optimization Of High-speed Electric Wheel

From these three points of view, of which are simplifying the transmission system,reducing the vehicle mass and improving the efficiency of transmission ways, thehigh-speed electric in-wheel motor driven car is more superior to other forms of electriccars. Choosing the high-speed electric wheel as the research object, this paper adoptsthe electromagnetic field finite element analysis software Ansoft Maxwell andmulti-physics finite element analysis software Ansys Workbench to carry out the finiteelement analysis and optimization for high-speed electric wheel.In this paper, the rationality of the magnetic circuit and the motor performanceindex are analyzed firstly. Analysis of the permanent magnet synchronous motor(PMSM) used in high-speed electric wheel is carried out, including properties of themotor in the static magnetic field, the under the rated load and the no-load magneticfield for the electromagnetic field, the results of which show that magnetic circuitdesign in this paper is relatively reasonable, and the performance indicators meet therequirements of the dynamic properties of electric wheel car. At the same time, themotor rated working point loss is calculated as heat source in the subsequenttemperature field analysis.Secondly, the cooling system of PMSM of high-speed electric wheel is analyzed inthe flow field, which verifies the flow properties of the cooling system performance.Then, the temperature field of the PMSM prototype is analyzed, of which the motorsteady-state temperature field distribution and the highest temperature point of themotor are obtained, and the reasons of the difference in temperature distribution areanalyzed, which shows the effectiveness of cooling water and its influence to theelectrical components. After, the transient temperature field of motor is analyzed, whichindicates that the motor has a certain short-term overload capacity.Thirdly, the high-speed electric wheel axle structure displacement field finiteelement are analyzed, including static analysis, modal analysis and fatigue lifeprediction analysis, which demonstrate that the axle can meet the requirements instrength, impact resistance, fatigue strength and reliability.Finally, to reduce the adverse effects had by the increasing sprung mass of theelectric wheel system on the vehicle ride comfort, combing the theory of optimizationdesign for motor electromagnetic design is optimized. The efficacious material mass of the optimized motor decreased by3.62kilogram, of which the weight loss rate is19.2%.Meanwhile, as an example, the force transmission mechanism transfer plate of theelectric wheel is optimized and designed, and the optimized transfer plate weight loss is3.99kilogram, while the weight loss rate is38.2%. All in all, the optimization effect isrelatively obvious, which achieves the goal that reduces the mass of electric wheel.