Research on Different Design Approaches to Mitigate Torque Ripple and Electromagnetic Vibration for High-performance Electric Vehicle Traction Machine

doi:10.11985/2021.04.006

Abstract

Abstract:

Torque ripple and vibration are two leading limiting factors for interior permanent magnet (IPM) machines using in electric vehicles (EVs). At present, the skewing slots and segmented rotor methods are favored by EV traction motor manufacturers. These two methods are comprehensively analyzed and compared to provide technical reference for the torque ripple and electromagnetic vibration suppression of high-performance EV permanent magnet motors, especially IPM machines. Extensive performance comparisons in terms of cogging torque, back-EMF, reluctance torque, and instantaneous torque, are carried out. Besides, multi-physical field coupling models are established to compare the vibration properties including exciting force, modal frequencies, and vibration response. Finally, the skewing slot machine and segmented rotor machine are prototyped, and extensive experimental tests are done to verify the validity and reliability of the analysis and comparison. The research results indicate that the segmented rotor machine can achieve the same force quality as that of the skewing slot machine and greatly reduce the electromagnetic vibration. Besides, the application of the segmented rotor approach is not limited by the axial length, and it has a lower processing cost.

Key words: Electric vehicle traction system, interior permanent magnet (IPM) machine, electromagnetic vibration, torque ripple

CLC Number:

TM351

WANG Daohan, PENG Chen, WANG Xiuhe. Research on Different Design Approaches to Mitigate Torque Ripple and Electromagnetic Vibration for High-performance Electric Vehicle Traction Machine[J]. Journal of Electrical Engineering, 2021, 16(4): 42-50.

Figures/Tables 27

References 15

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参数	数值
定子槽数z	48
转子极对数p	4
定子外径R_os/mm	90
定子内径R_is/mm	61.6
转子外径R_or/mm	61.1
转子内径R_ir/mm	20
气隙长度g/mm	0.5
轴向长度L_ax/mm	96
极弧系数α_p	0.74
额定功率P/kW	10
额定转速n_N/(r/min)	3 000
额定转矩T_N/(N·m)	32
永磁体厚度T_PM/mm	5.1
永磁体长度L_PM/mm	17.6

参数	原始电机	定子斜槽电机	磁极分段电机
磁阻转矩峰值/ (N·m)	3.86	2.86	3.21
磁阻转矩平均值/ (N·m)	1.31	1.30	1.31
矩角特性峰值/ (N·m)	27.57	21.05	22.15
矩角特性平均值/ (N·m)	13.75	13.61	13.64

参数		原始电机	斜槽电机	磁极分段电机
三相正弦电流注入	峰-峰值/ (N·m)	23.67~34.12	28.11~29.40	28.05~29.72
	平均值/ (N·m)	29.47	28.69	29.10
	脉动比例(%)	35.46	4.49	5.75
SVPWM FOC 控制	峰-峰值/ (N·m)	25.79~37.82	30.68~33.46	30.43~33.78
	平均值/ (N·m)	32.00	32.00	32.00
	脉动比例(%)	37.60	8.68	10.47

阶次	定子类型	频率/Hz
n=2	直槽定子	605.21
n=2	斜槽定子	605.58
n=3	直槽定子	1 629.2
n=3	斜槽定子	1 631.1
n=4	直槽定子	2 894.9
n=4	斜槽定子	2 871.5

参数		定子斜槽电机	磁极分段电机
矩角特性	峰值/(N·m)	20.61	20.64
矩角特性	平均值/(N·m)	12.07	12.02
瞬态转矩	平均值/(N·m)	32.59	32.49
瞬态转矩	脉动比例(%)	13.0	16.1