п»їВ В В В В В В В В В В В CONTENTS
1 . INTRODUCTION
2 . STRUCTURE
3. WORKING PRINCIPLE
a few. ENGAGEMENT PERIOD
8. ABOVE EXCITATION
being unfaithful. WEAR
15. TYPES OF ELECTROMAGNETIC BRAKE SYSTEMS
11. POSITIVE ASPECTS
12. DIS ADVANTAGES
1 ) INTRODUCTION
Electromagnetic brakes operate electrically, although transmit rpm mechanically. Because of this , they accustomed to be called electro-mechanical braking. Over the years, NO ANO DE brakes became known as electromagnetic, referring to their actuation approach. Since the brake systems started becoming popular above sixty yrs ago, the variety of applications and braking mechanism designs has increased dramatically, however the basic operation remains the same. Single deal with electromagnetic brake systems make up about 80% of all the so-called power applied brake applications. This article generally concentrates on these types of brakes. Option designs are shown by the end of this article. Electromagnetic brakes have been completely used because supplementary retardation equipment beyond the regular rubbing brakes about heavy automobiles. We outline the general concepts of regular braking and several substitute retardation techniques in this section. The working principle and characteristics of electromagnetic braking are then simply highlighted. В В В
2 . STRUCTURE
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A horseshoe magnet В has a north and south rod. If a piece of carbon metal contacts equally poles, a magnetic routine is created. In an electromagnetic braking mechanism, the north and southern pole is created by a coils shell and a wound coil. In a brake, the armature has been pulled up against the brake discipline. The frictional contact, which is being controlled by the strength with the magnetic field, is what causes the rotating motion to stop. All of the rpm comes from the magnetic appeal and agent of rubbing between the stainlesss steel of the colonne and the metallic of the braking system field. For many industrial brake systems, friction material is used between the poles. The material is mainly used to help decrease the wear rate. Nevertheless different types of materials can also be used to alter the agent of scrubbing (torque) for special applications. For example , in case the brake was required to provide an extended time to stop or slide time, a minimal coefficient materials can be used. On the other hand, if the brake pedal was instructed to have a rather higher rpm (mostly intended for low RPM applications), an increased coefficient friction material could be applied. In a braking mechanism, the electromagnetic lines of flux have to attract and pull the armature talking to it to complete brake pedal engagement. Most industrial applications use what is called a single-flux two-pole braking mechanism. The coil shell is made with carbon steel that has a mix of good durability and good magnetic houses. Copper (sometimes aluminum)
magnet line, is used to produce the coils, which is saved in shell both by a bobbin or by simply some type of epoxy/adhesive. To help enhance life in applications, friction material is used involving the poles. This friction material is definitely flush while using steel within the coil shell, since in case the friction material has not been flush, great magnetic grip could not happen between the encounters. Some people take a look at electromagnetic brakes and mistakenly assume that, because the friction material is flush with the steel, which the brake has already worn down, yet this is not the truth. В В В В В В В В В 3. WORKING PRINCIPLE
There are three parts to an electromagnetic braking system: field, armature, and centre (which is definitely the input on a brake) (B-2). Usually the magnetic discipline is bolted to the equipment frame (or uses a torque arm that can handle the torque in the brake). So when the colonne is attracted to the discipline the stopping torque is transferred in to the field real estate and in the machine framework decelerating the burden. This can happen very fast (. 1-3sec). Disengagement is very simple. Once the field begins to degrade debordement...
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