面向电动燃油泵的电磁热耦合数值模拟

Numerical Simulation of Electromagnetic-thermal Coupling for Electric Fuel Pump

针对电动燃油泵的生热问题,提出一种周期性平均损耗的分布式热源模型。建立永磁同步电机的电磁-热双向耦合模型,并数值模拟电机各部件的损耗特性和其在不同转速时的稳态温度分布。结果表明:电动燃油泵在转速为6 000 r/min、供油压力为8 MPa时,其内部电机的最高温度可达407.8 K,位于定子铁芯的齿部,且温度沿径向向外逐渐降低至393.9 K;在高温环境中工作时,电动燃油泵的寿命与可靠性会随永磁体磁性的减弱而逐渐降低。

This paper proposes a distributed heat source model with periodic average losses to address the heat generation problem of electric fuel pump.An electromagnetic-thermal coupling model of a permanent magnet synchronous motor is established,and the loss characteristics of each motor component and its steady-state temperature distribution at different speeds are numerically simulated.The results show that when the speed of electric fuel pump is 6000 r/min and the supply pressure is 8 MPa,the highest temperature of the internal motor can reach 407.8 K,which is located in the teeth of the stator core,and the temperature gradually decreases to 393.9 K radially outward.The life and reliability of the electric fuel pump will gradually decrease with the demagnetization of permanent magnets when working in a high temperature environment.