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Thursday, 17 December 2015

WORKING PRINCIPLE OF DC ELECTROMAGNETIC BRAKE

We have discussed in our previous post about the concept and working principle of electric hydraulic thruster, where we have seen the various key component of thruster and also we have seen the working principle of brake operated by electric hydraulic thruster. I have requested to all off you to provide your feedback at the end of post in comment box, so that we can improve the quality of this website.

So let us one more type of braking mechanism, which is widely used these days in various industries for EOT crane, Conveyors and for other material handling equipments. Do you have any guess about which type of brake, I am talking? Yes, that is DC electromagnetic brakes.

DC electromagnetic brakes are also used to operate the drum brake mechanism to allow and to restrict the rotation of brake drum as per requirement.

Let us see the various components of DC electromagnetic brake and after that we will see the operating principle i.e. we will see how a DC electromagnetic brake works in this article.

DC electromagnetic brake: Component

Let us first see one DC electromagnetic brake as in following figure.


Image courtesy: Duke Brakes

1
Lock nut
18
Lock strip
2
Spherical washer
19
Lock strip
3
Torque Spring
20
Retro fit kit
4
Spring pin
21
Washer
5
Pull rod
22
Felt
6
Spring
23
Brake shoe lever inner
7
Wedge assembly for adjustment
24
Base
8
Adjusting Wedge for Adjustment assembly
25
Brake drum
9
Inner Armature
26
Retainer
10
Pin for Pull rod
27
Lock bracket
11
Outer armature
28
Screw
12
Guard made of rubber
29
Dacron felt
13
Spring pin
30
Brake shoe lever outer
14
Screw assembly for adjustment
31
Brake liner
15
Gland
32
Clamp
16
Compression spring
33
Screw
17
Coil
34
Lock spring


35
Brake shoe

We have discussed each component in table and we have also shown the respective component in above figure.

Working principle of DC electromagnetic brake

As we have seen above in figure, there are two armatures i.e. inner armature and outer armature and coil also. When electric power will be supplied, the coil will be energized and there will be produced magnetic field and both armatures will be attracted with each other due to produced magnetic field and therefore torque spring will be compressed. As torque spring will be compressed and armatures will be attracted with each other, Brake show will move away from brake drum and brake drum will be able to rotate.

When power supplied will be off, in that situation coil will be de-energized and hence compressed torque spring will come in its original position and simultaneously both armatures will be separated with each other and therefore brake shoe will be pressed against brake drum and brake drum rotation will be stopped. Let us consider the operation of DC electromagnetic brake in EOT crane, Toque spring of DC electromagnetic brake will provide the ability to EOT crane to hold the load at any point.

I will request to my readers to provide their feedback about the working principle of DC electromagnetic brakes.

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