Electromagnetic brake

BYRajesh kumar

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INTRODUCTIONElectromagnetic brakes operate

electrically, but transmit torque mechanically.

This is why they used to be referred to as electro-mechanical brakes.

Part of electromagnetic brake

Field Armature Hub

Basic OperationVoltage/Current - And the

Magnetic Field

The magnetic field that is generated in the wire, from the current, is known as the “right hand thumb rule.

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Burnishing - What Is It and Why Is It Important?Burnishing is the wearing or mating of opposing surfaces.When the armature and brake faces are

produced, the faces are machined as flat as possible.

TorqueWhen considering torque,

the question of using dynamic or static torque for the application is key?

•For example, if running a machine at relatively low rpm (5 – 50 depending upon size) there is minimal concern with dynamic torque since the static torque rating of the brake will come closest to where it is running.

Over ExcitationOver excitation is

used to achieve a faster response time.

It’s when a coil momentarily receives a higher voltage then its nominal rating.

•Three times the voltage typically gives around 1/3 faster response.

•With over excitation the in rush voltage is momentary.

WearIt is very rare that a coil would just stop working in an electromagnetic brake.The main wear in electromagnetic brakes

occurs on the faces of the mating surfaces .

Every time a brake is engaged during rotation a certain amount of energy is transferred as heat.

Example of electromagnetic brakeElectromagnetic Power Off Brake

• Electromagnetic Particle Brake

THANK YOU…!