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Analysis on mechanical response of external rotor core of direct drive permanent magnet generator under time-varying loads
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Yuling HE1, 2, Jiawen YANG1, Kai SUN1, Xuewei WU1, Xiaoguang ZHU1, Haoran LUO1
Journal of Mechanical Strength | 2025, 47(4) : 27 - 38
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Journal of Mechanical Strength | 2025, 47(4): 27-38
• ·Fatigue·Damage·Fracture·Failure Analysis· •
Analysis on mechanical response of external rotor core of direct drive permanent magnet generator under time-varying loads
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Yuling HE1, 2, Jiawen YANG1, Kai SUN1, Xuewei WU1, Xiaoguang ZHU1, Haoran LUO1
Affiliations
  • 1.Hebei Key Laboratory of Electric Machinery Health Maintenance & Failure Prevention, North China Electric Power University,Baoding 071003, China
  • 2.Suzhou Institute, North China Electric Power University, Suzhou 215000, China
Published: 2025-04-15 doi: 10.16579/j.issn.1001.9669.2025.04.004
Outline
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The mechanical response of external rotor direct drive generator under time-varying loads is analyzed theoretically, calculated by simulation and verified by test. Firstly, the source of magnetic pull of the rotor core of the external rotor generator and its variation with load were analyzed. The expression of magnetic pull of the rotor and the characteristics of time and space order were determined. The basic vibration model of the external rotor core was analyzed, and the basic vibration equation of the external rotor core was determined. Then the simulation model of the external rotor generator was established, and the spatiotemporal order characteristics of the magnetic pull and the typical daily variation rule with time were obtained. The magnetic pull density obtained from the electromagnetic field was used as the input load to guide the structure field. The magnetic-solid coupling simulation was carried out, and the deformation and stress distribution and noise response of the external rotor core were calculated and analyzed. Finally, a simulation example of a 13 kW external rotor direct-drive generator proved the correctness of the analysis and simulation. The results of the study determined the time-varying load on the outer rotor core and its mechanical response distribution. It is found that the time and position of the rotor core should be tested emphatically when the generator is running. Noise characteristics under time-varying loads are also analyzed. The analysis provides reference for the maintenance and design of the generator.

External rotor direct drive permanent magnet synchronous generator  /  Mechanical response  /  Magnetic pull  /  Time-varying load  /  Electromagnetic noise
Yuling HE, Jiawen YANG, Kai SUN, Xuewei WU, Xiaoguang ZHU, Haoran LUO. Analysis on mechanical response of external rotor core of direct drive permanent magnet generator under time-varying loads[J]. Journal of Mechanical Strength, 2025 , 47 (4) : 27 -38 . DOI: 10.16579/j.issn.1001.9669.2025.04.004
Funding
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  • National Natural Science Foundation of China(52177042)
  • University Basic Scientific Research Operation Cost Special Fund(2023MS128)
  • Third Batch of Youth Top Talent Support Plan in Hebei Province(［2018］-27)
  • Hebei Province High level Talent Funding Project(B20231006)
  • Suzhou Social Development Technology Innovation Project(SS202134)
Appendix
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Year 2025 volume 47 Issue 4
PDF
73
38
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Article Info
doi: 10.16579/j.issn.1001.9669.2025.04.004
  • Receive Date：2024-05-11
  • Online Date：2026-03-20
  • Published：2025-04-15
Article Data
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History
  • Received：2024-05-11
  • Revised：2024-08-17
Funding
National Natural Science Foundation of China(52177042)
University Basic Scientific Research Operation Cost Special Fund(2023MS128)
Third Batch of Youth Top Talent Support Plan in Hebei Province(［2018］-27)
Hebei Province High level Talent Funding Project(B20231006)
Suzhou Social Development Technology Innovation Project(SS202134)
Affiliations
    1.Hebei Key Laboratory of Electric Machinery Health Maintenance & Failure Prevention, North China Electric Power University,Baoding 071003, China
    2.Suzhou Institute, North China Electric Power University, Suzhou 215000, China

Corresponding:

SUN Kai, E-mail：
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
Number of
species		 占总种数比例
Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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