Power loss analysis and cooling design of flat wire motor winding for vehicle electrical motor
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摘要: 车用扁线电机具有体积小、质量轻、功率密度高的特点，但随着车用电机向高速化发展，扁线电机的交流损耗变大，其温升特点不同于传统圆线电机，需要设计与之相适应的冷却方法. 首先建立新能源汽车用高速扁线永磁同步电机的二维有限元模型，分析WLTC-3工况下扁线导体的尺寸、层数以及并联支路数对电机交流损耗的影响规律，获得最优的导体尺寸和绕组连接方式. 然后在损耗分析的基础上，根据电机的温度场分布，设计了电机槽内油冷的最佳冷却方法，降低了温升，提高了电机运行的可靠性.Abstract: The flat wire motor for Electric Vehicles have the characteristics of small size, light weight and high power density. However, with the development of high-speed motor, the AC loss of flat wire motor becomes larger, and its thermal rise performance is different from the traditional circular wire motor, so it is necessary to design a cooling method suitable for it. Firstly, a two-dimensional finite element model of a high speed flat permanent magnet synchronous motor for new energy vehicles was established, the influences of the size, layer number and parallel branches number of the flat conductor on the AC loss of the motor under the driving cycle of WLTC-3 were analyzed, and the optimal conductor size and winding connection mode were obtained. Then on the basis of loss analysis, according to the temperature field distribution of the motor, the optimal cooling method of oil cooling has been designed, which reduces the temperature rise and improves the reliability of the motor operation.
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Key words:
- flat wire motor /
- AC loss /
- loss analysis /
- cooling method
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图 13 连续瞬态热性能随转速变化
Figure 13. Continuous transient thermal performance varies with rotational speed
图 14 绕组、永磁体、转子温度变化情况
Figure 14. Changes of winding, permanent magnet and rotor temperature
表 1 电机性能指标
Table 1. Motor performance indicators
参数 数值 参数 数值 额定转矩/(N•m) 380 转子内径/mm 135 额定转速/(r•min−1) 6000 峰值功率/kW 200 最高转速/(r•min−1) 12000 效率/% 96 
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表 2 主要结构参数
Table 2. Main structural parameters
参数 数值 参数 数值 定子外径/mm 250 槽口高/mm 0.2 定子内径/mm 175 槽口宽/mm 3 槽宽/mm 5.5 槽肩角/(°) 20 槽深/mm 25
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表 3 绕组层数与并联支路数组合
Table 3. Numbers of winding layers and parallel branches
编号 绕组层数 并联支路数 方式1 4 2 方式2 6 2 方式3 8 2 方式4 4 4 方式5 6 4 方式6 8 4
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表 4 电机内部各温度节点
Table 4. Each temperature node inside motor
温度节点 部件 温度节点 部件 T1 机壳 T2 定子铁心轭部 T3 定子铁心齿部 T4 槽内绕组 T5 端部绕组 T6 气隙 T7 转子铁心 T8 转轴 T9 轴承 T10 安装板 T11 电机端部空气 T12 端盖
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