STRUCTURE ANALYSIS AND OPTIMIZATION OF MAGNETIC POLE COMBINED PERMANENT MAGNETIC SCREW
In order to improve the manufacturing difficulty of the complex helical-shape magnetic pole (HSMP) in permanent magnetic serew, the structure of HSMP is improved and replaced. The static characteristies of thrust and torque were simulated with the finite element method (FEM). It is proved that the t...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Journal of Mechanical Strength
2024-04-01
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| Series: | Jixie qiangdu |
| Subjects: | |
| Online Access: | http://www.jxqd.net.cn/thesisDetails#10.16579/j.issn.1001.9669.2024.02.013 |
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| Summary: | In order to improve the manufacturing difficulty of the complex helical-shape magnetic pole (HSMP) in permanent magnetic serew, the structure of HSMP is improved and replaced. The static characteristies of thrust and torque were simulated with the finite element method (FEM). It is proved that the two kinds of permanent magnetic screws, whose screw is oblique ring magnetic poles (ORMP), nut is HSMP, and screw is HSMP, nut is ORMP, can realize smooth transmission. Two practical improvements were carried out, because there were still some HSMP in the structures. Scheme one was to combine andarrange several circular arc-shaped magnetic poles (CASMP) blocks in step. Scheme two was a semi-oblique ring magnetic poles(SORMP) composite strueture. The results show that the number of combined pole blocks required for the latter is less, it can ensure the smooth transmission of the motion system, at the same time, with greater thrust and torque. Compared with LRMG which screw and nut are HSMP, the thrust and torque errors are 3.981% and 0.583% respectively, so it is an ideal scheme to replace HSMP. In addition, the concept of pole pitch ratio <italic>K</italic> was proposed, and it is concluded that when <italic>K</italic>=0. 3, the thrust and torque of unit volume pole have the largest value, and the utilization rate of magnetic pole is the highest. On this basis, SORMP composite structure is optimized by Halbach array. The peak thrust and torque can be increased by 42.3% and 36.3% respectively, and the optimal auxiliary ratio <italic>λ</italic> =0.4. |
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| ISSN: | 1001-9669 |