不同层数扁线电机及其搭载整车性能分析

Simulation analysis of rectangle-wire motor with different conductor layers and its vehicle performance

扁线电机由于效率高、散热能力强,且噪声、振动与声振粗糙度(NVH)好,逐渐成为新能源汽车驱动电机的发展趋势。随着驱动电机高速化的不断推进,扁线电机绕组涡流损耗表现尤为显著,影响电机效率的提升,同时带来电机散热难的问题。本文首先介绍扁线电机绕组涡流损耗的基本原理,仿真分析4层绕组、8层绕组电机的绕组损耗,进而计算两绕组电机方案的效率等高线图并比较分析;然后基于Cruise软件搭建整车仿真模型,两个电机方案得到两个整车模型,分别计算两整车模型的整车经济性,即基于标准工况的续航里程;最后通过分析比较得知,搭载8层绕组电机的整车续航里程略大。8层绕组工艺复杂度较大,但4层绕组高速绕组损耗过大,温升超限值,所以只能选择8层绕组电机方案。

Because of its high efficiency,good heat dissipation and NVH(noise,vibration,harshness),rectangle-wire motor has become the development trend of new energy vehicle drive motor.With the development of high-speed drive motor,the eddy current loss of rectangle-wire motor windings is particularly remarkable,which affects the efficiency of the motor and brings the problem of heat dissipation.The winding loss of motor with 4-layer winding and 8-layer winding are analyzed by 2D simulation,and the motor efficiency contours of two winding schemes are simulated and compared.Then the two whole vehicle simulation models are built based on Cruise software according to two motor schemes.The economy of the whole vehicle is analyzed and calculated,which is the range of the vehicle based on the standard working condition.Finally,through analysis and comparison,it is found that the vehicle with 8-layer winding motor has a slightly greater driving range.The process of 8-layer winding motor is much more difficult,and the high-speed winding loss of the 4-layer winding is too large and the temperature rise exceeds the limit,so the 8-layer winding motor scheme is chosen.