abstract<br>With the development of science and technology and the progress of human civilization, automobile has become the main means of transportation in people's production and life. However, due to energy shortage and environmental pollution, we must use clean and renewable energy. The research and development of electric vehicles and hybrid vehicles is an important way to solve the problem of clean and renewable use of transportation energy and protect the environment. As an important part of the driving system of the automobile, the analysis of the loss of the wheel motor is of great significance.<br>First of all, the paper analyzes and studies the loss of hub motor, determines the type of motor loss, describes the relevant knowledge of motor loss, and deduces the calculation formulas of all kinds of motor loss by using the motor loss knowledge of relevant knowledge. Secondly, the theoretical points of the finite element simulation are described. Based on Maxwell, the finite element simulation model of the motor is established. The no-load simulation, load simulation and transient simulation of the motor are carried out respectively, and the correctness of the theoretical derivation is verified. And based on the workbench to the motor temperature field simulation, it is proved that the motor winding has the highest heat distribution and temperature. At last, this paper optimizes the loss of the motor based on genetic algorithm, which reduces the loss of the motor to a certain extent and improves the working efficiency of the motor.<br>Through the loss analysis and optimization design of the hub motor, the simulation calculation and design results are obtained. Among them, the simulation of temperature field can further study and calculate the cooling mode of motor. The loss optimization of hub motor based on genetic algorithm can further improve the genetic algorithm and further optimize the loss of motor.<br>Key words: hub motor loss; finite element simulation; temperature field simulation; genetic algorithm<br>
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