
233Magnetorheological (MR) Applications for Heavy Vehicles
TABLE8.1
Design Parameters of the MR Fan
Clutch
Design Parameter Value
Height of disk, t 0.013 m
Depth of coils, w 0.012 m
Width of housing, dh 0.0085 m
Vertical gap size, g
v
0.001 m
Horizontal gap size, g
h
0.003 m
Max. electrical input 1.2 A
Max. eld 50 A/mm
Max. yield shear stress, τ
y
49.2 kPa
Max. controllable torque 29.3 Nm
(a) MR fan clutch device assembly
(b) Disk of MR fan clutch
FIGURE 8.9
Photograph of the MR fan clutch.