In motor electromagnetic noise analysis, the main focus is the radial electromagnetic force and other electromagnetic force components are ignored, which causes the analysis to be inaccurate. The electromagnetic simulation was conducted aiming at the problem to analyze the magnetic field and electromagnetic force distribution of 8-pole 24-slot permanent magnet synchronous drive motor. Radial electromagnetic force alone and radial, tangential and axial electromagnetic forces were respectively applied on the stator model of the motor in order to analyze the electromagnetic noise. The electromagnetic noise of the motor was calculated by the boundary element method, and the accuracy of the simulation analysis was verified by experiments. The parameterized structural model of the motor was established, and the influence of different stator slot widths and magnet fillet radii on radial, and tangential electromagnetic force and electromagnetic noise was analyzed. The results show that the tangential electromagnetic force has a certain effect on the electromagnetic noise, and the motor stator model loaded with radial, tangential and axial electromagnetic forces is more reliable. Reasonable reduction of stator slot width and magnet fillet radius can effectively reduce electromagnetic noise of the motor.
Yu WANG,Zhi-yong HAO,Kang ZHENG,Xu ZHENG,Yi QIU. Analysis of electromagnetic noise of permanent magnet synchronous motor based on multi-directional electromagnetic force. Journal of ZheJiang University (Engineering Science), 2020, 54(12): 2286-2293.
Fig.1Permanent magnet synchronous drive motor for vehicle
参数
数值
参数
数值
磁极数
8
定子槽口宽度/mm
3
定子槽数
24
磁体宽度/mm
26
定子外径/mm
133
磁体圆角半径/mm
2
定子内径/mm
80
绕组接法
星形接法
转子外径/mm
79
定子绕线形式
单层叠绕组
Tab.1Motor structure parameters
Fig.2Finite element model of motor stator
Fig.3First four modes of motor modal simulation
Fig.4Free-mode test of motor
Fig.5First four modes of motor modal test
Fig.6Electromagnetic simulation model of permanent magnet synchronous motor
Fig.7Electromagnetic simulation results of permanent magnet synchronous motor
Fig.8Spectrogram of electromagnetic force amplitude of motor
Fig.9Motor electromagnetic noise simulation analysis process
Fig.10Electromagnetic force distribution on stator tooth surface
Fig.11Vibration acceleration cloud map of permanent magnet synchronous motor under 720 Hz
Fig.12Schematic diagram of sound field of motor
Fig.13Sound pressure level cloud map of motor under 1800 Hz
Fig.14Electromagnetic noise spectrum of motor
Fig.15Motor noise test
Fig.16Comparison of simulation and test motor noise results
Fig.17Parameterized model of stator slot width and magnet fillet radius of permanent magnet synchronous motor
Fig.18Radial and tangential electromagnetic force spectrum of stator slot widths
Fig.19Electromagnetic noise spectrum of different stator slot width motors
Fig.20Radial and tangential electromagnetic force spectrum of different magnet fillet radius
Fig.21Electromagnetic noise spectrum and motor torque of different magnet fillet radius motors
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