外转子永磁同步电机作为轮毂电机较多地应用在电动汽车上，但以轮毂电机为目标的振动噪声研究却较少。以一台额定功率为10 kW、额定转速为500 r/min的轮毂电机为例，通过构建轮毂电机的2D有限元模型，对电机的径向电磁力密度和振动噪声特性进行有限元仿真计算。从极弧系数和定子齿上开辅助槽两个方面对外转子轮毂电机的振动噪声特性进行研究。仿真结果表明：轮毂电机极弧系数为0.72左右时，振动噪声特性较好；在定子齿顶开设不对称的双辅助槽显著提升了电机的振动噪声特性。

External rotor permanent magnet synchronous motor (PMSM) as in-wheel motor is widely used in electric vehicles, but there are few studies on in-wheel motor vibration and noise. An in-wheel motor with the rated power of 10 kW and the rated speed of 500 r/min is taken as an example to calculate the radial electromagnetic force density and vibration and noise characteristics of the motor in finite element simulation by constructing 2D finite element model of the in-wheel motor. The vibration and noise characteristics of the external rotor in-wheel motor are studied from pole arc coefficient and auxiliary slots on stator teeth. It is shown in simulation that the vibration and noise characteristics of the in-wheel motor are better when the pole arc coefficient is about 0.72 and double auxiliary slots are set on the stator teeth tip.