Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (6): 1777-1785.doi: 10.13229/j.cnki.jdxbgxb20161326

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Electromagnetic brake with changed⁃temperature air gap width

Ren HE(),Kun TU   

  1. School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
  • Received:2016-12-07 Online:2019-11-01 Published:2019-11-08

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Abstract:

An electromagnetic brake with new structure was studied in this paper. The electromagnetic braking torque can be improved as the air gap width can self-regulate with the change of temperature. The heat conduction model, air gap width model and electromagnetic braking torque model were established. The structure parameters of the electromagnetic brake were optimized, including the air gap width, the size of the iron-core and the thermal-deformation component. The finite element model of the electromagnetic brake was established in ANSYS, which was used to research the temperature change of the brake. The long downhill condition and emergency braking condition were studied by simulation. The change of the air gap width was analyzed in Matlab. The current requirement of the new electromagnetic brake was compared with that of an old brake in the same brake task. The results show that increasing the air gap width of the self-regulation structure, the new electromagnetic brake can smoothly work in the long downhill braking condition and emergency braking condition, when the air gap width is 0.4 mm to 1 mm. The brake torque of the new electromagnetic brake is increased significantly.

Key words: vehicle engineering, electromagnetic brake, air gap, temperature compensation, structural parameters optimize

CLC Number: 

  • U463.53

Fig.1

Structure schematic diagram ofelectromagnetic brake"

Fig.2

Heat conduction model"

Fig.3

Coil input current of two kinds of brakeworking condition"

Table 1

Material performance parameters"

参 数 碳钢 铝合金
导热系数/[W·(m·℃)-1] 52.3 162
比热容/[Cal·(kg·℃)-1] 460 871
密度/(kg·m-3) 7 850 2 660
线膨胀系数/(10-4·℃-1) 13 23.8
弹性模量/GPa 206 70
泊松比μ 0.28 0.36

Fig.4

Temperature field distribution ofelectromagnetic brake"

Fig.5

Temperature distribution along path"

Fig.6

Temperature changes over time ofiron core and thermal expansion"

Fig.7

Displacement nephogram of the center crosssection at electromagnetic brake"

Fig.8

Width of air gap changes over time ofelectromagnetic brake"

Fig.9

Coil current relationship between electro?magnetic brake without and with air gapadjustment"

Fig.10

Relationship between width of air gap and ratio of thermal expansion and core length"

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