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Accurate parameter design for radial AC hybrid magnetic bearing

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Abstract

For more stable operation of radial AC hybrid magnetic bearing (radial AC HMB), it is particularly important to realize optimization design of parameters for its prototype. The paper focuses on solving the several typical defects of traditional methods and puts forward specific countermeasures on improving its disadvantages. Thus, a new parameter design method based on two sets of magnetic field system (the stator core magnetic field system and the air gap field system) is proposed to calculate the structure and electromagnetism parameters of the radial AC HMB. Using the proposed parameter design method, a finite element model of radial AC HMB based on the design results are simulated in finite element analysis software. The simulation results are consistent with the expected parameters calculation results very well, which show accuracy of the parameters and the proposed method. To illustrate the validity of the parameter design approaches further, the verification experiment is conducted. The operating experimental results show that the radial AC HMB has high stability, fast start of suspension and fine anti-disturbance. Moreover, system performance comparison results show the control system based on the new parameter design method has stronger anti-disturbance characteristics than that based on the traditional parameter design method.

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Abbreviations

B C1 :

control magnetic flux density in the stator core

B C2 :

control magnetic flux density in the air gap

B max1 :

maximum magnetic flux density in the stator core

B max2 :

maximum magnetic flux density in the air gap

B 01 :

biased magnetic flux density in the stator core

B 02 :

biased magnetic flux density in the air gap

B r :

remanence

B s :

saturation flux density

D ir :

inner diameter of rotor

D is :

inner diameter of stator

D or :

outer diameter of rotor

D os :

outer diameter of stator

σ :

coefficient of total magnetic leakage

σ C :

coefficient of control magnetic leakage

σ 0 :

coefficient of biased magnetic leakage

F rmax :

maximum resulting force

F x :

maximum suspension force in x direction

φ C1 :

control magnetic flux flowing through the stator core

φ C2 :

control magnetic flux flowing through the air gap

φ 01 :

biased magnetic flux flowing through the stator core

φ 02 :

biased magnetic flux flowing through the air gap

H c :

coercivity of the permanent magnet

i A, i B, i C :

the 3-phase radial control current respectively

J max :

current density

k :

ratio of the minimum width of magnetic pole body and the arc length of pole shoe

l :

arc length of pole shoes

l z :

axial length of magnetic poles

N im :

maximum Ampere-turns of coils

p 1 :

number of pole pairs of torque windings

p 2 :

number of pole pairs of suspension windings

S :

radial magnetic pole area

S 1 :

minimum cross-sectional area of pole bodies

S 2 :

area of pole shoes

S N :

cross-sectional area of coil

t :

minimum width of magnetic poles

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Authors and Affiliations

  1. School of Electrical and Information Engineering, Jiangsu University, No.301 Xuefu Road, Zhenjiang, China, 212013

    Wei-Yu Zhang & Huang-Qiu Zhu

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  1. Wei-Yu Zhang
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  2. Huang-Qiu Zhu
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Correspondence to Huang-Qiu Zhu.

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Zhang, WY., Zhu, HQ. Accurate parameter design for radial AC hybrid magnetic bearing. Int. J. Precis. Eng. Manuf. 15, 661–669 (2014). https://doi.org/10.1007/s12541-014-0385-y

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  • DOI: https://doi.org/10.1007/s12541-014-0385-y

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