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.