Presentation onElectromagnet Brake System

Prince Pal Singh 100106255 Rahul Yadav 100106273 Rajesh Chauhan 100106275 Pravin Kumar Mishra 100106254

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Introduction Power Off Components Features Working

Contents

Electromechanical brakes operate through an electric actuation, but transmit torque mechanically. When voltage or current is applied, the coil is energized thus creating a magnetic field. This then turns the coil to an electromagnet which develops magnetic lines of flux. This flux attracts the armature to the face of the brake. The armature and hub are normally mounted on the shaft that is rotating. Since the brake coil is mounted solidly, the brake armature, hub and shaft come to a halt in a short amount of time.

Introduction

When current or voltage is removed from the brake, the armature is free to turn with the shaft. In most designs, springs are the ones that hold the armature away from the brake surface when power is released, thus creating a small air gap. Cycling is achieved by turning on and off the voltage or current to the coil. Slippage should occur only during deceleration and when the brake is engaged, there should be no slippage once the brake comes to a full halt.

Power off brakes stop or hold a load when electrical power is either accidentally lost or intentionally disconnected. In the past, some companies have referred to these as "fail safe" brakes. These brakes are typically used on or near an electric motor. Typical applications include robotics, holding brakes for Z axis ball screws and servo motor brakes. Brakes are available in multiple voltages and can have either standard backlash or zero backlash hubs. Multiple disks can also be used to increase brake torque, without increasing brake diameter. There are 2 main types of holding brakes. The first is spring applied brakes. The second is permanent magnet brakes.

Power Off Brakes

Wooden Block: LxB = 60 x 46 cm. Iron Support : Height – 53cm & Width – 5cm One Wheel : Wheel Diameter – 42cm One Disc : Disc attached with wheel , Diameter of Disc –

5.5cm D.C Motor : 24 v 2 Transformer : Step down Transformers of 12 v , 5 A . 2 Magnet Copper Coil One Shaft Two Bearing Two Iron Gear with Chain Assembly Weight : 8 kg Approx.

Components

Diagram

Small profile: High torque in a small space makes for a very compact design brake.

Zero backlash option: Some designs contain a zero backlash hub that can be critical in registration applications.

Fast response time: In most units, a series of coil springs are used so pressure plate travel is minimized.

Multiple voltages available: Depending upon the size, 24, 45 or 90 volts are available; however, voltages can be modified to meet your special requirement.

Features

Working

Engagement: When no current/voltage is applied to the brake, a series of springs push against the pressure plate, squeezing the friction disk between the inner pressure plate and the outer cover plate. This frictional clamping force is transferred to the hub, which is mounted to a shaft (customer supplied).

The power off brake is considered engaged when no power is applied to it. It is typically required to hold or stop a load in the event of a loss of power, when power is not available to run a machine.

Working

Disengagement: When the brake is required to release, voltage/current is applied to the coil creating a magnetic field. This magnetic field pulls in the pressure plate pulling against the springs, creating an air gap between the pressure plate and the friction disk, allowing it to turn freely with the shaft.

Laxmi Cycles Pal Automobiles Aggarwal Electricals Khan Wood Work

References

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