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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2019, Vol. 53 Issue (11): 2248-2254    DOI: 10.3785/j.issn.1008-973X.2019.11.024
Electrical Engineering     
Electromagnetic noise reduction of permanent magnet synchronous motor by step-skewed rotor
Ke XU1(),Hong-liang YING1,2,Su-rong HUANG1,Qi ZHANG1,*()
1. School of Electromechanics and Automation, Shanghai University, Shanghai 200444, China
2. Shanghai Edrive Co. Ltd, Shanghai 201806, China
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Abstract  

In order to weaken the electromagnetic force harmonics caused by the tooth harmonics and effectively suppress the electromagnetic noise of the motor, the analytical formula of radial electromagnetic force wave of step-skew was derived, the mechanism of step-skew suppressing the electromagnetic noise of permanent magnet synchronous motor was analyzed, and the relationship between different segments of step-skew and the order of weakened tooth harmonics was discussed. The radial electromagnetic force wave and electromagnetic noise of a 48-slot 8-pole permanent magnet synchronous motor with different segments of step-skew were simulated and analyzed based on MANATEE simulation platform. The variation of electromagnetic force harmonics with and without step-skew was obtained, and the influence of the step-skew on electromagnetic noise was further analyzed. Results show that when the order of tooth harmonics is integral multiple of segments of step-skew, step-skew cannot weaken the order of tooth harmonics. When the order of tooth harmonics is non-integral multiple of segments, the tooth harmonics and the electromagnetic noise can be effectively suppressed. The measured noise values of the prototype were in good agreement with the simulation results, which verified the mechanism of step-skew suppressing electromagnetic noise of motor and the correctness of the simulation analysis.

Key words： permanent magnet synchronous motor      step-skew      tooth harmonics      radial electromagnetic force wave      vibration noise     
Received: 07 September 2018      Published: 21 November 2019
CLC:  TM 351  
Corresponding Authors: Qi ZHANG     E-mail: xuke1993@shu.edu.cn;qizhang@staff.shu.edu.cn
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Ke XU
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Cite this article:

Ke XU,Hong-liang YING,Su-rong HUANG,Qi ZHANG. Electromagnetic noise reduction of permanent magnet synchronous motor by step-skewed rotor. Journal of ZheJiang University (Engineering Science), 2019, 53(11): 2248-2254.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.11.024     OR     http://www.zjujournals.com/eng/Y2019/V53/I11/2248


转子分段斜极对永磁同步电机电磁噪声的削弱影响

为了削弱由齿谐波引起的电磁力谐波从而有效抑制电机的电磁噪声，推导转子分段斜极的径向电磁力波的解析式，分析分段斜极对永磁同步电机电磁噪声的抑制机理，讨论不同斜极分段数与削弱的齿谐波阶次之间的关系. 基于MANATEE仿真平台，对48槽8极永磁同步电机进行不同斜极分段数下的径向电磁力波和电磁噪声仿真分析，得到斜极分段前后主要阶次的径向电磁力谐波在不同斜极分段数下的变化规律，分析分段斜极对电磁噪声的影响. 研究结果表明：当齿谐波阶次为分段数的整数倍时，转子斜极无法削弱该阶齿谐波；当为非整数倍时，该阶次的齿谐波可以得到有效抑制，电磁噪声明显下降. 样机的实测噪声与仿真结果基本吻合，验证了转子分段斜极降低电机噪声的机理及仿真分析的正确性.


关键词： 永磁同步电机,  分段斜极,  齿谐波,  径向电磁力波,  振动噪声 
分类 r ωr Pr
1 （ν±μ）p ω1±ωμ FνΛ0FμΛ0（2μ0）
2 （ν±μ）p±kZ ω1±ωμ FνΛ0FμΛk（4μ0）
3 （ν±μ）p±kZ ω1±ωμ FνΛkFμΛ0（4μ0）
4 （ν±μ）p±2kZ ω1±ωμ FνΛ0FμΛk（8μ0）
Tab.1 Characteristic parameters of radial electromagnetic force wave
分类 fr
6f 12f 18f 24f
1 5/?5， 7/7 11/?11， 13/13 17/?17， 19/19 23/?23， 25/25
2 5/7， 5/?17 11/1， 11/?23 17/?5， 17/?29 23/?11
3 7/?5， 7/19 13/1， 13/25 19/7 25/13
4 5/19， 7/?17 11/13， 13/?11 17/7， 19/?5 23/1， 25/1
Tab.2 Harmonic sources of 0th electromagnetic force wave of 48-slot 8-pole motor
分类 fr1）
10f 14f 22f 26f
1）注：仅列出与齿谐波相关的径向电磁力谐波来源
1 9/?11， 11/13 13/?11， 15/13 21/?23， 23/25 25/?27， 27/25
2 ? 13/1 ? ?
3 11/1， 11/25 15/25 23/13 27/17
4 9/13， 11/?11 13/13， 15/?11 21/1 25/1
Tab.3 Harmonic sources of 8th electromagnetic force wave of 48-slot 8-pole motor
参数 数值
定子槽数 48
极数 8
最大转速/（r·min?1） 9 500
额定转速/（r·min?1） 4 000
最大扭矩/（N·m） 200
机壳外径/mm 270
电机轴向长度/mm 105
转子分段数 2
转子斜极角度/(°) 3.75
Tab.4 Technical parameters of prototype
Fig.1 No-load air gap magnetic density simulation results in different segment numbers
Fig.2 Harmonic analysis of radial electromagnetic force in different segment numbers
Fig.3 A-weighted sound pressure level sonagram at full speed conditions
Fig.4 A-weighted sound level comparison in different segment numbers of step-skewed rotor
Fig.5 Noise test experiment of prototype
n0/（r·min?1） Lp-test/dB Lp/dB
2 500 55.9 53.2
4 000 60.5 59.2
5 500 56.6 51.2
7 000 63.7 58.1
8 500 69.3 65.9
9 500 66.7 63.3
Tab.5 Comparison between measured noise values and simulation results
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