Sae as4787 eddy current inspection of circular holes in nonferrous metallic aircraft engine hardware. The eddy current drive is installed between the motor and the driven equipment. Eddy current techniques in ndeeddy current techniques in nde. Eddy current drives, also known generically as magnetic drives, eddy current clutches or magnetic clutches are driven at constant speed by an ac motor and utilize a simple electromagnetic device to control torque and speed to the driven load. An eddy current brake, also known as an induction brake, electric brake or electric retarder, is a device used to slow or stop a moving object by dissipating its kinetic energy as heat. Remote operation, with divers or rope access techniques, make all locations accessible. Eddy current clutches or eddy current slip coupling are available in a broad range of sizes and speed up to thousands of kilowatts in both vertical and. Torque is transmitted to a variable speed output in proportion to. Addition al information on parts is always available at your request. The adjustable speed drive and all components of the drive system, such as operator control devices, electrical power distribution equipment, the motor and. A replacement solution for 1235 367 eddy current controllers. The clutch acts as a friction clutch only in the event of an increased coolingair requirement. Read through this users manual for the correct and best operation methods to achieve.
The clutch consists of two parts, primary member and secondary member. The squirrel cage rotor is attached to the driving motor. Adobe designed the portable document format, or pdf, to be a document platform viewable on virtually any modern operating system. Transmission clutch inspection machine eddy current testing. The physical working principle is the same for both.
Feb 15, 2021 eddy current is the swirling current produced in a conductor, which is subjected to a change in magnetic field. The eddy current drive or clutch is a slip device consisting of two rotating elements that. Pdf is a hugely popular format for documents simply because it is independent of the hardware or application used to create that file. Highquality eddy current testing solutions for complete inspections. How to shrink a pdf file that is too large techwalla. Diagram 1 eddy current clutch and gearbox assembly 2 general this standard is to be used in conjunction with the manufacturers maintenance instructions, drawings and technical information, listed herein, for the respective eddy current clutch. Explain the principle of eddy current drive mechanism for motors. In a circular, disk or rotary eddy current brake, the conductor is a flat disk rotor that turns between the poles of the magnet. Ac motor, eddy current clutch, brake or controller. If your pdf reader is displaying an error instead of opening a pdf file, chances are that the file is c. An oversized pdf file can be hard to send through email and may not upload onto certain file managers. Eddycurrent clutches and fluid couplings resource library. Dynaspede series of eddy current drives forms a family of ac adjustable speed drives, offered as a cost effective. For more specific information, refer to an appnote an02 via the internet.
The paint program can help you make new image files, but it cannot open document or pdf file. Panasonic gpx series eddy current digital displacement. The clutch contains a fixed speed rotor and an adjustable speed rotor separated by a small air gap. Eddycurrent clutch article about eddycurrent clutch by. The clutches considered here are of the friction type, depending on sliding friction between solid surfaces. The torque that is generated is proportional to the change in rpm, giving a smooth acceleration. Tkk corporation 1023 ms siam tower, 24 floor, room 244247, rama 3 road, chong nonsi, yannawa, bangkok 10120 thailand tel. The eddy current clutch is composed of an input drum which is driven by the motor at constant speed, and an output rotor, usually positioned concentrically within the drum. Design of an eddy current torque bypass clutch for.
In positive contact clutches, power transmission is achieved by means of friction. Complex load test setup using a dc generator, dc motor, dual gearboxes, and a 2000hp3600rpmac motor to accomplish a full load test of a hp water cooled ed. Other types use magnetic, eddy current and hydrodynamic forces. Our eddy current dynos are simple, cost effective, torque measuring devices for a large range of test purposes. If the stator of an induction motor or a synchronous motor is mounted to rotate independently of the rotor, an eddy current clutch results. In a linear eddy current brake, the conductive piece is a straight rail or track that the magnet moves along. The eddycurrent drive also called a magneticallycoupled adjustable speed drive, which consists of an eddycurrent clutch and associated controls, is favored for heavyduty applications with high starting torque and severe shock loads. Unlike centrifugal clutches that use friction surfaces, there are no sudden changes in torque. What is the primary advantage of an eddy current clutch over. For longer transient protection, an eddy current clutch can be added to the motorgenerator set described in the preceding paragraph 1 see fig. One of the two pole bodies is used as an armature ring, said pole body being arranged such that it can be displaced axially with respect to the other pole body and it. The coils are excited with dc and attached to the mechanical load.
Eddy current clutch working, application, advantages and. Electromagnetic brakes also called electromechanical brakes or em brakes slow or stop motion using electromagnetic force to apply mechanical resistance friction. Because of the tendency of eddy currents to oppose, eddy currents cause energy to be lost. Depending on the type of scanner you have, you might only be able to scan one page of a document at a time. This article explains what pdfs are, how to open one, all the different ways.
Once youve done it, youll be able to easily send the logos you create to clients, make them available for download, or attach them to emails in a fo. Eddy currents are the root cause of the skin effect in conductors carrying ac current. After the motor has reached its target speed, its controller engages the eddy clutch. A pdf file is a portable document format file, developed by adobe systems. They are a type of variable speed drive system which depends on an electromagnetic clutch to vary the output speed and torque of a constant speed motor. Making a pdf file of a logo is surprisingly easy and is essential for most web designers. Figure 1 the control supplies dc voltage to the drive field coils and automatically varies drive excitation to maintain desired speed, torque, tension, position, or horsepower, as determined by the feedback signal. Transmission clutch inspection machine eddy current.
Thank you for purchasing panasonic industrial devices sunxs series gpx highspeed highaccuracy eddy current digital displacement sensor. Eddy currents also called foucaults currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to faradays law of induction. An eddy current clutch relies on electromagnetic forces to create a coupling torque. Most electronic documents such as software manuals, hardware manuals and ebooks come in the pdf portable document format file format.
An eddy current clutch input rotor is magnetized when the coil is energized with dc current. Eddy current drives for industrial automation dynaspede. Esr 0557 overhaul of eddy current clutch and gear box. Eddy current techniques are commonly used for the nondestructive examination nde and condition monitoring of a large variety of metallic structures, including heat exchanger tubes, aircraft fuselage, and aircraft structural components. Eddy current clutch hydrostatic drives wound rotor motor dc drives ac variable frequency drives. Eddy current inspection of open fastener holes in aluminum aircraft structure. Tech talk february 2011 eddy current drives holland industrial. Muhammad azmi 1 feb 2331033 teknik pengecoran logam program studi teknik pengecoran logam politeknik manufaktur negeri bandung jl. Each magnetic clutch shall consist of a stationary frame, a ring member driven at motor speed, and a variable speed member, bearings, outer bearing bracket and housing, heat exchanger if recommended by the manufacturer, motor. When using a mechanical clutch, what determines how fast a load can be accelerated and the amount of initial torque applied to the load.
Used to control dc drives or other variable speed drive systems. Dec 03, 2015 e eddy current or fluid coupling f variable frequency drive 12. Model dsi700 universal eddycurrent controller instruction. Eddy current drives can produce more torque at low speed than an induction motor and vfd. Is it costeffective to replace old eddycurrent drives. Applications the compact size of the eddy current instrument, and cable lengths of up to 100 metres make weld scanning a viable alternative to more traditional inspection techniques. An eddy current drive, also known generically as a magnetic drive, eddy current clutch or magnetic clutch, is an electromechanical variable speed drive that uses a constant speed motor as the input. This will enable the factory to locate records in case you are unable to describe completely the part wanted. These clutches could address the problems affecting friction. Luckily, there are lots of free and paid tools that can compress a pdf file in just a few easy steps.
Eddy current drive mechanism employs an eddy current clutch to vary the output speed. Transmission clutch eddy current inspection system youtube. It is the recommended scientific method to identify the root cause of a problem and the extent of damage caused to the tubes. Eddy currents decay exponentially with depth in the material standard depth of penetration.
We have the most extensive experience, and we develop the highest quality ect inspection products. Im1600002004 dcd2 through 225 eddy current drives instruction manual revised february 18, 2004 drive source international, inc. More accurately, eddy currents transform more useful forms of energy such as kinetic energy into heat, which is much less useful. By michelle rae uy 24 january 2020 knowing how to combine pdf files isnt reserved. Before returning material, contact the nearest factory regional or district.
Clutches the function of a clutch is to permit smooth, gradual connection and disconnection of two members having a common axis of rotation. Snttc1a personnel qualification and certification in nondestructive testing. At heco, we carry dynamatic variable speed solutions, including eddy current clutches, eddy current brakes including air cooled and. Expired lifetime application number us174184a inventor jr richard c woodward. If your scanner saves files as pdf portbale document format files, the potential exists to merge the individual files into one doc. One of the fun things about computers is playing with programs like paint. An eddy current clutch is described which is provided with pole bodies which are arranged in a homopolar manner and lie with their ends at least partially axially in front of one another. In the basic form, the eddy current drive consists of an ac motor and an electrically controlled magnetic clutch. These eddy currents create their own magnetic flux that reacts with the input rotor to transmit torque. To combine pdf files into a single pdf document is easier than it looks.
You can use the tools in paint to add something to a different document. An eddy current drive sometimes called a dynamatic drive, after one of the most common brand names consists of a fixed speed motor generally an induction motor and an eddy current clutch. Trane care services trane care off ers an extensive array of. Eddy current clutch is a type of electromagnetic clutch. They can be induced within nearby stationary conductors by a timevarying magnetic field created by an. Electromagnetic clutches brakes minneapolis, mn rapid. The following references were used to develop this process specification.
Because eddy current couplings and fluid couplings are uncommon, the institutional knowledge about them is being lost. The eddy current clutch prototype doesnt meet the torque requirement of 193 nm on the slip speed range see table 3, because of clutch geometric constraints imposed by the retro fit. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. This switching point is selected such that the clutch acts as a controllable eddy current clutch over virtually the entire range of operation, in that the maximum fan rotation speed is virtually never required. I paid for a pro membership specifically to enable this feature. Eddy current clutches go by quite a few names, including eddy current drives, magnetic drives, magnetic clutches, or eddy current clutches. This is an eddy current clutch motor, which is an electrical mechanical means of varying motor speed to your load without using a vfd. Eddy current clutches, for one reason or another, cannot always be repaired or rebuilt. Pdf file or convert a pdf file to docx, jpg, or other file format. The pdf format allows you to create documents in countless applications and share them with others for viewing. Read on to find out just how to combine multiple pdf files on macos and windows 10. Us3167674a us174184a us17418462a us3167674a us 3167674 a us3167674 a us 3167674a us 174184 a us174184 a us 174184a us 17418462 a us17418462 a us 17418462a us 3167674 a us3167674 a us 3167674a authority us united states prior art keywords rotary magnetic magnetic hub rotary eddy current prior art date 19620219 legal status the legal status is an assumption and is.
These high torque, low inertia eddy current drives are mated with. Fluid couplings and torque converters are examples. Using a cnc eddy current system combined with a laser inspection, the eddy current testing system provides instant verification allowing manufacturers to detect flaws or defects in the metal as well as capture the complex internal geometry of parts without needing visual access or destroying the part. Unlike friction brakes, where the drag force that stops the moving object is provided by friction between two surfaces pressed together, the drag force in an eddy current brake is an electromagnetic force. Nonferrous metal separator nes eddy current separator.
Pdf design and experimental demonstration of a seamless. They are available in standard and high speed models with many speed and torque versions. This webinar recording is intended to preserve the knowledge of how they. Eddy current dynamometers dynos providing precise control and low maintenance. Makalah material testing eddy current test dan radiographic test disusun oleh. What is the primary advantage of an eddy current clutch over a mechanical clutch. Pet permanentmagnet eddycurrent clutchbrake tkk corporation. Energy efficient technologies in electrical systems. This method of varying speed only reduces the speed of the driven load, which is different than variable frequency drives and dc drives, which vary the speed of. This output is isolated from earth ground to make it more. High yield and long life are the qualities that make for assured, longterm operating result.
This means it can be viewed across multiple devices, regardless of the underlying operating system. The purpose of this volume is to present the basic concepts of eddy currents, to explain how eddy currents are generated and distributed, to point out how the specimens magnetic and electrical effects relate to eddy currents, and. How dynamatic technology works adjustable speed drive system. The clutch contains a fixed speed rotor and an adjustable speed rotor separated by a. Zetec is the industry leader for costeffective eddy current testing ect in complex applications. They were originally called electromechanical brakes, but over the years the name changed to electromagnetic brakes, referring to their actuation method. The variable speed drive shall be an eddy current coupling type magnetic drive, of aircooled open type construction. The top countries of supplier is china, from which the percentage of eddy current clutch supply is. The eddy current drive or clutch is a slip device consisting of two rotating elements that are coupled by a magnetic field. Eddy current clutches consist of a field, ta chometer, and. Shortage or damage should be reported promptly to the carrier and your distributor. Variable frequency drives and dc drives operate by electronically altering the input power to control the speed of the motor.
Magnetic coupling 222 202 direction and distribmion of eddy. The magnetic flux of the input rotor then causes small eddy currents to flow in the nonferrous output rotor. In such instances, you might be interested in investing in a new eddy current drive system. When it comes to understanding your needs, were your trusted advisor. What is the primary advantage of an eddy current clutch. The drive motor is started with no dc excitation to the clutch. Eddy current tube analysis should be conducted as a part of predictive and curative maintenance program. When switching to a vfd for a constant torque load, the motor and the drive may require being oversized by a factor of 150% to 200%.
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