Analysis of Demagnetization Characteristics of Permanent Magnets in High Density Permanent Magnet Synchronous Motor

doi:10.11985/2019.02.021

Abstract

Abstract:

There is an irreversible demagnetization risk for high-density permanent magnet synchronous motor rotor permanent magnets for industrial robots. A permanent magnet synchronous motor permanent magnet with an 8-pole 36-slot industrial robot is taken as an example to study the demagnetization fault. The time-step finite element method is used to analyze the change of electromagnetic field in different degrees of demagnetization of permanent magnet motor. The Fourier series harmonic decomposition theory is used to obtain the air gap magnetic field and current harmonic content of the motor. The air gap magnetic field, armature current, back EMF waveform, flux linkage waveform, magnetic field trajectory and the magnetic core density characteristics of the stator core are given under the state. Based on the analysis of the above parameters, the feature quantities closely related to the demagnetization fault are extracted, which lays a foundation for further research on the demagnetization fault diagnosis and online monitoring theory of permanent magnet synchronous motor.

Key words: High-density permanent magnet motor, demagnetization fault, feature quantity, electromagnetic field

CLC Number:

TM351

HU Tuxiong,HU Bi,WANG Wei,CAO Wenyao. Analysis of Demagnetization Characteristics of Permanent Magnets in High Density Permanent Magnet Synchronous Motor[J]. Journal of Electrical Engineering, 2019, 14(2): 121-126.

Figures/Tables 14

References 13

[1]	骆敏舟, 方健, 赵江海 . 工业机器人的技术发展及其应用[J]. 机械制造与自动化, 2015(1):1-4.
	Luo Minzhou, Fang Jian, Zhao Jianghai . The development and the application of the industrial robot technology[J]. Machine Building & Automation, 2015(1):1-4.
[2]	王秀和 . 永磁电机[M]. 北京: 中国电力出版社, 2007.
[3]	Urresty J C, Riba J R, Delgado M , et al. Detection of demagnetization faults in surface-mounted permanent magnet synchronous motors by means of the zero-sequence voltage component[J]. IEEE Transactions on Energy Conversion, 2012,27(1):42-51. doi: 10.1109/TEC.2011.2176127
[4]	唐任远 . 现代永磁电机理论与设计[M]. 北京: 机械工业出版社, 2016.
[5]	肖曦, 张猛, 李永东 . 永磁同步电机永磁体状况在线监测[J]. 中国电机工程学报, 2007,27(24):43-47.
	Xiao Xi, Zhang Meng, Li Yongdong . On-line estimation of permanent-magnet flux linkage ripple for PMSM[J]. Proceedings of the CSEE, 2007,27(24):43-47.
[6]	肖曦, 陈长明, 张猛 . 永磁同步电机失磁状态下的转矩脉动抑制[ C]. 中国高校电力电子与电力传动学术年会. 2009.
[7]	Moon S, Jeong H, Lee H , et al. Detection and classification of demagnetization and interturn short faults of IPMSMs[J]. IEEE Transactions on Industrial Electronics, 2017,64(12):9433-9441.
[8]	Faiz J, Nejadi-Koti H . Demagnetization fault indexes in permanent magnet synchronous motors—an overview[J]. IEEE Transactions on Magnetics, 2016,52(4):1-11.
[9]	Gandhi A, Corrigan T, Parsa L . Recent advances in modeling and online detection of stator interturn faults in electrical motors[J]. IEEE Transactions on Industrial Electronics, 2011,58(5):1564-1575. doi: 10.1109/TIE.2010.2089937
[10]	Kang D . Analysisof vibration and performance considering demagnetization phenomenon of the interior permanent magnet motor[J]. IEEE Transactions on Magnetics, 2017,53(11):1-7.
[11]	Torregrossa D, Khoobroo A, Fahimi B . Prediction of acoustic noise and torque pulsation in PM synchronous machines with static eccentricity and partial demagnetiza using field reconstruction method[J]. IEEE Transactions on Industrial Electronics, 2012,59(2):934-944. doi: 10.1109/TIE.2011.2151810
[12]	张昌凡, 张淼滢, 张发明 , 等. 一种检测永磁同步电机失磁的级联观测器[J]. 电机与控制学报, 2017,21(2):45-54.
	Zhang Changfan, Zhang Miaoying, Zhang Faming , et al. A cascade observer to detect demagnetization faults for PMSM[J]. Electric Machines and Control, 2017,21(2):45-54.
[13]	赵博, 张洪亮 . Ansoft 12在工程电磁场中的应用[M]. 北京: 中国水利水电出版社, 2013.

参数名称	取值	参数名称	取值
额定功率/kW	2.0	额定转矩/(N·m)	9.55
额定电压/V	110	定子外径/mm	123
额定转速/(r/min)	2 000	转子外径/mm	78
极数/槽数	8/36	永磁体材料	NdFe35UH
磁钢厚度/mm	3.6	永磁体结构	表面式

失磁率(%)	各次谐波含量(%)					畸变率
失磁率(%)	基波	2次谐波	3次谐波	8次谐波	17次谐波	畸变率
0	98.48	0.29	11.16	3.78	2.94	14.01
5	96.57	0.26	10.69	4.69	3.18	13.99
10	96.94	0.35	10.52	5.74	3.39	13.92
15	96.87	0.47	10.30	6.88	3.67	14.20
20	94.19	0.59	9.84	7.94	3.92	14.78
25	91.12	0.71	9.37	8.98	4.15	15.65
30	88.00	0.84	8.94	10.08	4.38	16.92
35	86.35	0.98	8.73	11.44	4.73	18.60
40	84.41	1.16	8.96	13.56	5.36	20.77
45	81.13	1.34	9.07	15.59	5.95	23.50
50	72.32	6.83	6.80	19.11	6.58	34.78

失磁率 (%)	基波电流幅值/A	基波电流 (%)	5次谐波电流(%)	总谐波电流(%)	畸变率
0	17.26	98.75	0.57	1.26	0.63
5	17.15	98.90	0.53	1.11	0.58
10	21.64	99.22	0.40	0.79	0.43
15	28.59	99.53	0.30	0.45	0.31
20	36.56	99.69	0.23	0.30	0.24
25	44.98	99.68	0.20	0.33	0.20
30	53.59	99.71	0.18	0.30	0.18
35	62.30	99.76	0.17	0.24	0.17
40	71.06	99.78	0.17	0.22	0.17
45	79.83	99.77	0.17	0.24	0.17
50	102.27	99.60	0.13	0.40	0.20