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Design and Performance Analysis of a New Lightweight Rotor Adaptive Electromagnetic Shock Absorber for Armored Vehicles


In order to solve the problem of the large moment of inertia of the existing rotating electromagnetic shock absorber for armored vehicles, a new lightweight rotor adaptive electromagnetic shock absorber (LR-AESA) is proposed in this paper. The LR-AESA consists of the left and right symmetrically distributed stators, a rotor in the middle and excitation coils. Secondly, based on the equivalent magnetic circuit method (EMC) and the Ampere loop theorem, and the interaction of the reaction magnetic fields between adjacent eddy current rings and the nonlinear effect of the interaction between the eddy current field and the original magnetic field are further considered, the air gap magnetic field distribution of the LR-AESA of the 10# steel rotor and the copper rotor at different speeds is derived, and the analytical expression of the damping torque is obtained. Finally, the validity of the analytical model was verified by comparison with results from the 3-D finite element method (FEM). The results show that the LR-AESA of the two material rotors can meet the requirements of technical indicators, but in the full speed section (200 ∼ 2000 rpm), the copper rotor has the advantage of a wider range of the damping torque adjustment.

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D :

external diameter of the LR-AESA, mm

H :

overall width of the LR-AESA, mm

R b :

radius of the magnetic pole center, mm

N :

the excitation coil turns

I :

the excitation current, A

τ m :

mean pole-arc length, mm

τ p :

mean pole pitch, mm

α :

pole-arc/pole-pitch ratios

R m1 :

reluctance of leakage magnetic flux of the magnetic pole itself, A/Wb

R m2, R mm :

reluctance of leakage magnetic flux between each pair of the magnetic poles, A/Wb

μ 0 :

vacuum permeability, H/m

μ ri :

relative recoil permeability of the back iron, H/m

μ rr :

relative recoil permeability of the rotor, H/m

μ rm :

relative recoil permeability of the magnetic pole, H/m

L m :

length of the magnetic pole, mm

b m :

width of the magnetic pole, mm

h m :

thickness of the magnetic pole, mm

l 1 :

thickness of the back iron, mm

l g :

length of the air gap, mm

l r :

thickness of the rotor, mm

l c :

radial length of the rotor, mm

p :

number of the magnetic pole pairs

σ c :

conductivity of the rotor, MS/m

ω :

angular velocity of the rotor in the magnetic field, rad/s

n :

rotation speed of the rotor, r/min

F f :

magnetomotive force of a magnetic pole, A


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The authors acknowledge the financial support from the Beijing Natural Science Foundation under Project 3212028.

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Correspondence to Desheng Li.

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Zhao, T., Li, D., Ye, L. et al. Design and Performance Analysis of a New Lightweight Rotor Adaptive Electromagnetic Shock Absorber for Armored Vehicles. Int.J Automot. Technol. 24, 643–654 (2023).

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