Page 34 - 《摩擦学学报》2020年第3期

300 摩 擦 学 学 报 第 40 卷

[1-2]
way to solve the friction and wear problems. Cong et al rotor and spline housing. When the power is on, the
processed out of different diameter and spacing of the armature is absorbed by the stator and the inner springs
micro-circular texture in the friction lining surface based of the stator are compressed. There is a reasonable gap
on the bionic non-smooth theory, and found that this between the armature and the rotor. When the rotor
type of friction lining has a significant anti-wear effect.
rotates with the spline housing, the brake is opened.
Bai et al [3-6] carried out studies on the dynamic
When the accident occurs, the brake is de-energized.
coefficients of gas film stiffness and damping as well as
And then the compression springs in the stator release,
the amplitude frequency characteristic by numerically
the stator and armature are separated. The armature
calculation with the perturbation method, and found that
presses against the friction lining of the rotor by spring
the elliptical texture was beneficial to improve the
force, and this produces a braking force which is
dynamic pressure effect of the dry gas seal, thus
transmitted to the load through the spline housing.
improving the opening force. This kind of texture can

effectively reduce the contact of friction surface and thus
Stator
[7]
reduce the wear. Andy and Lian use the genetic
algorithm to carry out the clutch friction lining structure
Armature
optimization by MATLAB, thus the volume of the
[8]
friction lining was reduced. Chen et al use the circular
iteration method to optimize the shape parameters of the Rotor
elliptical texture and analyze the influence of piston
motion velocity on the friction characteristics of the Splinehousing
texture surface. Therefore, the micro-elliptical texture
can be applied to the electromagnetic brake friction
lining in order to achieve the purpose of reducing wear Fig. 1 Electromagnetic brake structure diagram

and controlling friction on the friction lining surface.
In order to reduce the wear of the friction lining, the
However, the literature published in the current research
micro-elliptical texture was produced on its surface. The
in this area has not yet been reported. So it is of great
distribution of micro-elliptical textures on the friction
significance that the reliability and life of safety brake
lining is shown in Fig.2. The radial micro-elliptical
can be improved by adopted the micro-elliptical texture.
textured column as a unit of calculation is shown in
In this paper, the mechanism of the electromagnetic
brake friction lining with micro-ellipse texture was Fig.3.
studied by numerical method. First, the micro-elliptical As shown in Fig.3, the area density of the elliptical
textured friction lining analysis model was established. texture on the friction lining is as follows:
Secondly, the finite element method was used to solve
the pressure distribution on the surface of the friction
p o
lining, and the influence of the elliptical inclination
angle on the pressure distribution was studied to develop p i
r o r i
the design theory of micro-elliptical textured friction
lining in electromagnetic brakes and guide upgrading of
O O
the products.

2 Theoretical model

2.1 Geometric model
The structure of electromagnetic safety brake is Fig. 2 Schematic diagram of the distribution of micro-elliptical
shown in Fig.1, mainly including the stator, armature, textures on the friction lining