83
1.3.1 Working principle
Shaft(9) connects shaft sleeve(4)through flat key; shaft sleeve(4) connects friction disk
assembly(3) through spline. When the stator (11) is off power, spring (10) generated force works
on the armature(8), friction disk assembly(3) that drives the shaft(9) to rotate, grips between
armature(8) and friction disk(5), thus generates braking torque. For this moment, there will be a
gap “Z” between armature(8) and friction disk assembly(3) . When need to release the brake,
stator(11) connects the DC, then the generated magnetic field draws the armature(8) move to the
stator(11), spring(10) is compressed when armature(8) moves, at this time, friction disk assembly
(3) is loosened, brake is released.
1
7
5
3
8
9
4
10
11
Z
6
1. Mounting screw
3. Friction disk assembly
4. Shaft sleeve
5. Friction disk
6. Dust cover
7. Hollow screw
8. Armature
9. Motor shaft
10. Spring
11. Stator
Z. Air gap
Fig.2-5 Structure chart of electromagnetic brake
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