高速对转涵道风扇双驱动电机的热特性

doi:10.7527/S1000-6893.2023.29048

Abstract

Abstract:

This article proposes a dual-motor drive architecture for a counter-rotating ducted fan for high speed cruise， with the Fan-Fan-Motor-Motor （FFMM） layout design， where the counter-rotating fan is forward， and the drive motors behind the fans. The front and rear motors have different powers and sizes according to the aerodynamic requirements. The dual motor drive frame with the FFMM layout is installed in the center of the ducted fan， conducive to improving the aerodynamic performance of the counter-rotating fans. However， thermal coupling exists between the two motors in the same space and the accumulation of temperature in the space between the windings， making it difficult to judge the motor temperature rise during fan operation and the cooling effect based on the counter-rotating fan airflow. In this article， we first analyze the motor loss distribution characteristics of the dual motor drive architecture with the proposed FFMM layout under different operating conditions； then we explore the influence of thermal coupling between motors on the temperature rise of the front and rear motors， and optimize the thermal network model of the accumulated temperature cavity between the motors. To balance the temperature distribution of the front and rear motors in the center body and reduce the axial length of the centrosome structure， an annular heat conduction sheet structure for adjusting the thermal coupling degree between the two motors has been proposed， which can effectively improve the heat dissipation performance of the thermal cavity between the motors and optimize the temperature rise distribution of the front and rear motors. Finally， an experimental platform is built based on the high-speed counter rotating ducted fan， and electromagnetic and temperature rise experiments are completed. The experimental results are consistent with those of the simulation， indicating that the FFMM high-speed counter-rotating fan has a strong heat dissipation capacity under the direct air-cooling condition， and the annular heat conducting fins have a better cooling effect on the temperature distribution in the centrosome of the FFMM layout.

Key words: aviation electric propulsion, electric propulsion aircraft, counter-rotating ducted fan, equivalent thermal network method, thermal analysis

CLC Number:

Weikang HUANG, Zhuoran ZHANG, Xingya DA, Peibo YUAN, Huamin GAO. Thermal characteristics of dual drive motors for high speed counter⁃rotating ducted fan[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(8): 129048-129048.

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References 24

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参数	前置电机	后置电机
定子外径d_sO/mm	110	118
定子内径d_sI/mm	72	76
铁芯轴长l_ef/mm	65	45
绕组端部l_we/mm	26	28
气隙长度δ/mm	1	1
永磁体厚h_pm/mm	5	5
电流密度J/（A·mm^-2）	13.5	13.3
母线电压U/V	600	600
效率η/%	96.8	97.5
额定功率P/kW	45	35

部件	序号
中心体机壳	1，2，3，4，5，6，7，8，9
前置电机定子铁芯	11，12，13，14，15，16
前置电机绕组端部	17，21
前置电机槽内绕组	18，19，20
前置电机转子永磁体	22，23，24
前置电机转子轭部	25，26，27，28，29，30
前后空腔	52，54
转子间空腔	53
前置电机轴	56，57，58，59，60
整流罩	72，73，74
后置电机定子铁芯	31，32，33，34，35，36
后置电机绕组端部	37，41
后置电机槽内绕组	38，39，40
后置电机转子永磁体	42，43，44
后置电机转子轭部	45，46，47，48，49，50
绕组间空腔	51
轴承	55，61，67，71
后置电机轴	62，63，64，65，66，67，68，69，70

部件	导热系数/（W·℃^-1·m^-1）
绕组	径向	1.2
	切向	1.2
	轴向	360
铁芯	径向	48
	切向	48
	轴向	0.98
永磁体	10
灌封导热材料	2.1
静态空气（90 ℃）	0.028 6

对应区域	前置电机导热系数/（W·℃^-1·m^-1）			后置电机导热系数/（W·℃^-1·m^-1）
气隙内空气	5.354			5.226
与灌封材料接触的空腔空气	4.733			4.676
永磁体间空腔空气（按轴向分成3层计算）	5.568	4.798	4.013	3.987	4.732	5.479
永磁体间空腔空气（按轴向分成3层计算）	5.863	5.249	4.625	4.567	5.181	5.792

电机热耦合影响区域	前置电机温升/℃		后置电机温升/℃
电机热耦合影响区域	独立	耦合	独立	耦合
出线端端部	119.3	128.8	98.7	123.4
定子铁芯	100.2	111.6	92.9	109.3
转子铁芯	113.3	124.5	101.2	121.1

Thermal characteristics of dual drive motors for high speed counter⁃rotating ducted fan

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电机组件	有环状导热片		无环状导热片
电机组件	前置电机	后置电机	前置电机	后置电机
铁芯轭部	32.40	33.9	33.35	32.90
铁芯齿部	42.71	37.73	44.28	37.82
槽内绕组	40.20	38.71	40.60	38.59
出线端	40.70	38.72	42.66	39.82
积温空腔	25.25		22.90

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