以磁通等效实现磁悬浮轴承磁极容错控制

doi:10.16180/j.cnki.issn1007-7820.2023.02.006

Abstract

Abstract:

In view of the problem of fault-tolerant control of 8-pole electromagnetic bearings, a fault-tolerant control method of electromagnetic bearings based on flux equivalence is proposed in the present study. The method first obtains the current-flux influence coefficient of magnetic flux by simulation, and uses linear algebra theory to calculate the current distribution matrix. When a fault occurs in one pole circuit, the current distribution matrix is used to calculate the reconfiguration current so that the flux at the end surfaces of the eight poles remains the same before and after the fault, that is, the flux is equivalent, thus achieving fault-tolerant operation. The simulation is carried out in ANSYS finite element simulation platform, and the flux equivalent method can restore the flux and magnetic force line distribution at the end face before the failure, and the flux error (the maximum does not exceed 3.2%, and most of them are less than 0.5%) and force error (the maximum is not more than 7%, and most of them are less than 1.5%) are calculated, which proves the effectiveness of the proposed flux equivalent fault tolerance control method.

Key words: electromagnetic bearings, current-flux influence coefficient matrix, fault-tolerant control, pole fault, flux equivalence, current distribution matrix, reconfiguration current, equivalence error

CLC Number:

TP11

ZHU Fangfu,CHEN Liangliang,JIANG Kejian. Flux Equivalence Based Magnetic Pole Fault Tolerant Operation in Active Magnetic Bearings[J].Electronic Science and Technology, 2023, 36(2): 37-45.

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References 18

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名称	参数
定子直径/mm	44.0
转子直径/mm	105.0
磁极宽度/mm	9.6
定子凹槽直径/mm	76.0
气隙/mm	0.4
磁极面宽度夹角/(°)	25
相邻磁极夹角/(°)	45
定子磁极横截面积/mm²	288
匝数	80

编号	故障前	磁通等效
1号磁极	3 A	0.000 0 A
2号磁极	3 A	5.980 7 A
3号磁极	3 A	0.020 1 A
4号磁极	3 A	5.979 7 A
5号磁极	3 A	0.020 4 A
6号磁极	3 A	5.979 7 A
7号磁极	3 A	0.020 1 A
8号磁极	3 A	5.980 7 A

编号	故障前	磁通等效
1号磁极	5 A	0.000 0 A
2号磁极	5 A	9.967 8 A
3号磁极	5 A	0.033 5 A
4号磁极	5 A	9.966 1 A
5号磁极	5 A	0.034 0 A
6号磁极	5 A	9.966 1 A
7号磁极	5 A	0.033 5 A
8号磁极	5 A	9.967 8 A

编号	故障前	磁通等效
1号磁极	8 A	0.000 0 A
2号磁极	8 A	15.948 5A
3号磁极	8 A	0.053 6 A
4号磁极	8 A	15.945 8 A
5号磁极	8 A	0.054 4 A
6号磁极	8 A	15.945 8 A
7号磁极	8 A	0.053 6 A
8号磁极	8 A	15.948 5 A

编号	故障前	磁通等效
1号磁极	10 A	0.000 0 A
2号磁极	10 A	19.935 6 A
3号磁极	10 A	0.067 0 A
4号磁极	10 A	19.932 2 A
5号磁极	10 A	0.068 0 A
6号磁极	10 A	19.932 2 A
7号磁极	10 A	0.067 0 A
8号磁极	10 A	19.935 6 A

Flux Equivalence Based Magnetic Pole Fault Tolerant Operation in Active Magnetic Bearings

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