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Magnetic bearing
This document discusses magnetic bearings. Magnetic bearings support loads using magnetic levitation without physical contact. They use electromagnets to attract ferromagnetic materials and levitate rotors. Magnetic bearings require continuous power and active control systems to maintain stability. They have advantages over traditional bearings like higher speeds, less wear, and longer life. However, they are also more expensive and large in size. Magnetic bearings are increasingly used in industrial machines like compressors, turbines, pumps, motors and generators.
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Magnetic bearing
- 1. MAGNETIC BEARING NAME :SHEIKH SADI ID : 2015006623 MAJOR : MECHATRONICS ENGINEERING HUZHOU UNIVERSITY
- 2. CONTENTS: BEARING MAGNETIC BEARING DESCRIPTION BASIC OPERATION CLASSIFICATION MAGNETICBEARING PERFORM ADVANTAGES DISADVANTAGES APPLICATION CONCLUSION REFERENCE
- 3. BEARING A Bearing isa machine element which support another moving element. It permits relative motion between the contact surfaces of the members while carrying a load. Most bearings support rotating shafts against either radial or axial
- 4. MAGNETIC BEARING A Magneticbearing is a bearing which supports a load a load using magnetic levitation. A Magnetic bearing support moving machinery without physical contact,for example,they can levitate a rotating shaft and permit relative
- 5. and linear moving machinery Elements,withoutcontact with rotor,this is accomplished by electro magnet(bearing) which attracts a ferromagnetic material(rotor),using this principle rotor can be suspended in magnetic field which is generated by bearing.
- 6. DESCRIPTION It is difficultto build a magnetic bearing using permanent magnets due to the limitation imposed and techniques using diamagnetic materials are relatively undeveloped. As a result, most magnetic bearing require continuous power input and an active control system to hold the load stable. Because of this complexity, the magnetic
- 7. BASIC OPERATION An activemagnetic bearing (AMB) works on the principle of electromagnetic suspension and consists of an electromagnet assembl y, a set of power amplifiers which supply current to the electromagnets, a controll er, and gap sensors with
- 8. The power amplifiersupplies equal bias current to two pairs of electromagnets on opposite sides of a rotor. This constant tug-of-war is mediated by the controller which offsets the bias current by equal andopposite perturbations of current as therotor deviates from its center position The gap sensors are usually inductive in nature and sense in a differential mode. The power amplifiers in a modern commercial application are solid state devices which operate in a pulse width modulation (PWM) configuration.
- 9. Classification According to Controlaction – Active – Passive – Hybrid According to Forcing action – Repulsive – Attractive According to Sensing action – Sensor sensing – Self sensing According to Magnetic effect – Electro magnetic – Electro dynamic According to Load support – Axial or Thrust – Radial or Journal – Conical
- 10. MAGNETIC BEARING PERFORM LubricationFree Clean & Contamination Free Reliability High Surface Speed Low Vibration Low Energy Consumption Non-Contacting Submerged Operation
- 11. aDVANTAGEs Highest speeds arepossible even till the ultimate strength of the rotor. Absence of lubrication seals allows the larger and stiffer rotor shafts. Absence of mechanical wear results in lower maintenance costs and longer life of the system. Adaptable stiffness can be used in vibration isolation,passing critical speeds, robust to external disturbances
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- 13. APPLICATIONS Magnetic bearings areincreasingly used in industrial machines such as compressors, turbines, pumps, motors and generators. Magnetic bearings are commonly used in watt-hour meters by electric utilities to measure home power consumption. A new application of magnetic bearings is their use in artificial hearts.
- 14. CONCLUSION Magnetic bearings advantagesand applications have been discussed . Electromagnetism and Control system technologies have been introduced . Design of thrust and radial magnetic bearings have been studied . Control of a rotor by rigid rotor and flexible rotor models have been studied .
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