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Radial Force-Current Characteristics Analysis of Three-Pole Radial-Axial Hybrid Magnetic Bearings and Their Structure Improvement

Author

Listed:
  • Jintao Ju

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Huangqiu Zhu

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China)

Abstract

The radial stator of three-pole radial-axial hybrid magnetic bearings (HMB) has three magnetic poles and the three magnetic poles are driven by a three-phase converter, so the three-pole radial-axial HMB has the advantages of compact structure, low cost, low power consumption and so on. However, as the sum of three-phase current is zero and the three radial magnetic poles are asymmetric, the relationship between the radial suspension force and the control current is nonlinear. In this paper, firstly a mathematical model of three-pole radial-axial HMB is built based on the equivalent magnetic circuit method. The radial force-current characteristics are then analyzed based on the non-linearized model. The calculation, finite element method (FEM) and experimental results show that the suspension force on the x -axis is a quadratic function of the control current, but the suspension force on the y -axis is linear with control current. Besides, the suspension forces on the two radial axes are coupled with each other. Then, in order to decrease the nonlinearity and coupling of radial force-current characteristics, the six-pole radial-axial HMB is proposed based on the above analyses. The radial force-current characteristics of the six-pole radial-axial HMB are also analyzed based on the non-linearitzed model and are validated by 3-D FEM analysis. The calculation and FEM results have shown that the radial force-current relationship of a six-pole radial-axial HMB is linear and there is no coupling between the two radial axes.

Suggested Citation

  • Jintao Ju & Huangqiu Zhu, 2016. "Radial Force-Current Characteristics Analysis of Three-Pole Radial-Axial Hybrid Magnetic Bearings and Their Structure Improvement," Energies, MDPI, vol. 9(9), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:9:p:706-:d:77268
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    References listed on IDEAS

    as
    1. Huangqiu Zhu & Shuling Ding & Jintao Jv, 2016. "Modeling for Three-Pole Radial Hybrid Magnetic Bearing Considering Edge Effect," Energies, MDPI, vol. 9(5), pages 1-15, May.
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    Cited by:

    1. Weiyu Zhang & Huangqiu Zhu & Hengkun Yang & Tao Chen, 2017. "Experimental Analysis and Full Prediction Model of a 5-DOF Motorized Spindle," Energies, MDPI, vol. 10(1), pages 1-17, January.

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