Magnet and fluid couplings provide no contact between drive and driven elements, offer low maintenance and both are capable of absorbing shock loads. Energy savings example an eddycurrent drive on a standard efficiency motordriven 50. The vfd maker didnt address overvoltage issues, even small ones, with a fail safe. A standard analog dc drive with speed and current control is shown in figure below. The function of an eddy current clutch is to transmit a controlled torque from the induction motor,prime mover to the load driven machine.
The ecs retarder control system will save up to 50% of the current consumption by using the pulse width modulation pwm, saving batteries and alternator from wear. It takes the low current and then converts it into a high current which is appropriate for the motor. In addition, by amending the frequency of the excitation current, the inspection depth can be adjusted. An eddy current drive on a standard efficiency motordriven 50hp boiler forceddraft fan has. In order to properly cover the subject, it will be broken into four distinct parts. Dynamatic eddy current electromagnetic technology video. The eddycurrent, or drag, type is widely used in automobile speedometers. The drive efficiency at each operating point is equal to 100% minus the percent losses. Well have it back up and running as soon as possible. Electromagnetic clutch working, applications, advantages and. Provides details to help you choose a turbine supervisory instrumentation system. An eddy current testing platform system for pipe defect. Is it costeffective to replace old eddycurrent drives. This manual generally covers all model numbers beginning with the letters dcd, followed by a hyphen and a number between 2 and 225, and ending with a hyphen followed by a number between 4041 and 4181.
Eddy current clutch hydrostatic drives wound rotor motor dc drives. The eddy current brake is located within the coupling housing and con sists of a brake field coil assembly and the brake rotor. Hoist brake selection control braking is dynamic lowering, countertorque or eddy current load brake. What are the advantages and disadvantages of eddy current. After entering test moderefer to the following list to check that these leds are functioning properly. Eddy current drive is a combination of a constant speed ac induction motor, coupled to an eddy current clutch. Whether its material handling, elevator, mobile hydraulic or mining, we have a fundamental understanding of our customers. An eddy current drive system consists of ac motor and eddy current coupling, a control and operators control station. Many of these can be replaced with a standard induction motor and a general purpose pwm vfd to provide a more reliable. Please consult relevant publications for the type of control and regulation needed for your application or contact us for details. The drive motor, with a full load amp r ating of 250 amps, was at times drawing over 900 amps. As the eddy current drive efficiency drops rapidly at loads below 70%, energy savings are extremely sensitive to the load profile and duty.
In fact, you can measure its driving voltage on motors with at least one bearing thats electrically insulated from the motor frame. The medium of torque transmission is a controlled magnetic field, generated by a stationary. Eddy current technique is an important electromagnetic non. Since the drive conducts the same amount of current as the motor, its one of the most stressed components of a drive system. Table 1 indicates the efficiency range of a magnetically coupled eddycurrent drive when matched to a centrifugal load. Figure 2 shows the schematic diagram of a simple eddy current brake with only one magnet around it. Product manuals adjustable speed eddy current drives, brakes. Electricgenerator tachometers work by generating either an alternating or a direct current.
The magnetic drive pump has been preferred because of various advantages easy maintenance, robust design, leak free, etc. Various types of plug rolling mills which drive the tube over a long mandrel containing. Onsite troubleshooting of eddy current press drives. Provides specifications for the 1442 eddy current probe system. Ectane 2 measuring instruments pdf manual download. The brake field assembly is attached to the coupling. The electromagnetic clutch comes various forms, including magnetic particle clutch and multidisc clutch. The peaks in the high frequency spectrum also identify faults in the eddycurrent drive and the punch press itself, most likely looseness in the system related. The plant engineer also wanted to increase the torque output to the drawbench, improve overall drive. Spring applied air release saar brake assembly installation guide 5. Rao nondestructive evaluation division metallurgy and materials group indira gandhi center for atomic research kalpakkam 603 102, tn, india email.
Variable frequency drives vfds popular speed control devices used in industrial, commercial and residential applications. However, we have faced important and didactic issues due to inappropriate. Nondestructive testing ndt is a testing and analysis technique used by industry to evaluate the properties of a material, component, structure or system for characteristic differences or welding defects and discontinuities without causing damage to the original part. There is no mechanical linkage between input and output members of the drive. Dynamatic eddy current electromagnetic technology video drives and controls.
Eddy current brake design for operation with extreme back. Eddy current brakes are best substitutes for ordinary brakes, which are being used nowadays in road vehicles even in trains, because of their jerkfree operation. To determine which eddy current controller model can be used with your mechanical unit, please refer to the dynamatic controllers catalog section for the drivecontroller compatibility and selection chart. Klam electro magnetic retarder the new electronic retarder control system called ecs has many features and benefits to suite your requirements. This can drive a current down the shaft, to the bearings, through the frame, and back again through the bearings, as shown in fig.
The duration of this warranty is one year from date of shipment on all mustangrelated components. Installation, operation and maintenance instructions. Coil selection series coils are normally used with series wound dc motors to reduce the amount of wiring from the control point to the brake, such as between a crane bridge and trolley. There are even nocontact clutches such as hysteresis clutch and eddy current clutch. Tips for troubleshooting motor drives design world. The key component of the eddy current separator is the magnetic rotor, which has a series of permanent rare earth magnets mounted on a support plate attached to a shaft. The problem that occured which drew my attention to the coupling, was an intermittant speed variation, no change in controller output, and no shorted leads on the eddy coupling, just random speed changes, sometimes a slight rise, most often a slow down, no faults present, then it would just pick and run again.
Table 1 indicates the efficiency range of a magnetically coupled eddy current drive when matched to a centrifugal load. Mustangs aircooled electrical eddy current power absorbing unit. An eddycurrent drive on a standard efficiency motordriven 50hp boiler. Variable frequency drives vfds popular speed control devices used in industrial, commercial. It will take the use of your klam retarder to a new experience, taking away some of the fear factors of. Eddy current separators, or nonferrous separators, separate nonmagnetic nonferrous metals. Most importantly eddy current sensors do not require any mechanical contact between the ect probe and the test object 2. The eddy current inspection has various features that make it an appropriate option for pipe inspection purposes. Check back often as we are always adding new material. Using a phillips head screwdriver, loosen the screw securing the speed sensor in place. If the conveyor must have an open housing as a condition of its use and application, the entire conveyor is then to be guarded by a railing or fence in accordance with ansi standard b20. Our customers rely on our power and motion control expertise and our understanding of their applications.
Ac403 with automanual selector switch for accepting external speed. Why this municipailty chose dynamatic over vfds hubspot. The dc motor drive is a type of amplifier or power modulator that integrate between the controller and a dc motor. Highspeed drives in speed ranges 120 to 2700 rpm are restricted up to 15 hp due to air noise considerations. However, most widely used form is single face friction clutch. The thermal load on the power distribution system theref ore needed to be reduced to prevent the frequent overload trips. They purify large bulk streams andor separate nonferrous metals for reuse. Eddycurrent clutch high frequency data figure 16 identifies that a connection andor scr fault exists in the supply dc voltage from the rectifier six scrs. To solve these problems, a contactless magnetic brake has been developed. They can handle high capacities, because the conveyor belt separates and carries away nonferrous metals continuously and fully. The ability to detect defects in multilayer structures up to about 14 layers, without interference from the planar interfaces.
The drive unit consists of an ac induction motor driving the input member or fan pole assembly of the magnetic drive. In mountain areas where continuous braking force is needed, for a long time, the eddy current braking. Eddycurrent drives can produce more torque at low speed than an induction motor. Baylor elmagco eddy current brake, model 7838 installation. The subsequent analysis is based on this simple model. View and download eddyfi ectane 2 user manual online. Upgrading instead of replacing can be a practical solution to improve motor reliability.
If there is a problem with the drive, it can be bypassed. Alternatively the manual remote control can be replaced by the signal from a transducer or. While both can be implemented to either confirm or deny bearing current suspicions, owners are better served by incorporating these methods to establish a baseline and monitor trends. The vehicle electrical system will be monitored and protect against over and under voltage caused by the electro magnetic retarder or other electric consumers. Improper installation or operation of this drive control may cause serious injury to personnel or equipment.
Automated manual transmissions of electric and hybrid vehicles, sae int. Other articles where eddycurrent tachometer is discussed. Heart led blinks on blue with every signal from the contact heart rate receiver and red for wireless signals polar. Huge energy savings potential operating centrifugal fans, pumps and compressors vary frequency of electrical supply to an induction motor to vary the motor speed. Ect connector 19 pins the ect connector is used to hook up eddy current testing probes.
Ectane 2 e, ectane 2 e64, ectane 2 e128, ectane 2 e256, ectane 2 i, ectane 2 ernm, ectane 2 ernmi, ectane 2 e64rnm, ectane 2. Ndt also known as nondestructive examination nde, nondestructive inspection ndi and nondestructive evaluation nde. 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. The annual energy consumption of the existing system or eddy current baseline is calculated in table 2. One of the more common prime movers employed on stamping presses in our area is the dependable eddy current drive. The dynaspede series of eddy current drives comprises a family of ac adjustable.
Eddy current generation the rotating stator magnetic field and induced voltage in the rotor bars also causes voltage in the stator and rotor cores. Our service center location in southern ontario, canada, is considered ground zero for automotive stampings. Onsite troubleshooting of eddy current press drives resource. Product manuals adjustable speed eddy current drives. Vfds convert ac to dcthen dc to ac at varying frequency and voltage 460 v, 60 hz 640 v, dc 307 v, 40 hz ac dc ac rectifier inverter vfd introduction vfds allow the motor to operate and consume electricity as if it. This can provide early detection of possible problems. Most units our technicians encounter are in the 50 hp plus category, which makes for a large piece of equipment. Manuals user guidesview the most uptodate manuals, installation guides, and release notes for your product. Feed openings for shovel, front loaders or other manual or mechanical. Baylor elmagco eddy current brake, model 7838 installation, operation and maintenance manual 1. Im1600002004 dcd2 through 225 eddy current drives instruction manual revised february 18, 2004 drive source international, inc. Bulletin 9000f1 1011 2 pulley eddy current separator maintenance and operating instructions check immediately when the eddy current separator is received for possible. If the display is functioning and the numbers on the left side of the display are changing in value with each key press but the magnet does not move and numbers on right side of display do not appear, then the eddy current assembly needs to be replaced.
The objective of this system is to provide speed control and hence the speed reference becomes the input to the system and speed of the motor is the output of the system which is measured by the tachometer. The resulting current isnt localized within the bearings. Eddy current controls flexible and precise control options for all your adjustable speed drives and brakes. The eddy current separator ecs is furnished with a 12 diameter eddy current rotor, tail pulley, pillow block bearings, conveyor belt side guides, protective hood, and optional product discharge hoppers and splitter assemblies.
Ndt also known as nondestructive examination nde, nondestructive. Electromagnetic clutch working, applications, advantages. An eddy current drive is a device that machine operators use to control the torque and speed of a machines motor. Dynaspede series of eddy current drives forms a family of ac adjustable speed drives, offered as a. The signals from the connector are the eddy current generator outputs, the eddy current channel amplifier inputs, the multiplexing outputs, and a dc power supply.
Drive keeps blowing fusestripping breakers a defective drive can definitely cause fuses or breakers to trip. Control of eddy current drives eddy current drives are amenable for automatic feedback control of speed or torque. Troubleshooting the drive in this troubleshooting section, check, means investigating whether an item is functioning and in an acceptable physical condition, and then taking corrective action adjusting, fixing, replacing, etc. The frame is of welded structural steel construction. Nov 20, 2014 baylor elmagco eddy current brake, model 7838 installation, operation and maintenance manual 1. Led functions leds are used to indicate the status of many of the unit inputs. Eddy current brake eddy current drive units may be ordered complete with eddy current brakes for the purpose of quickly slowing speed of the output shaft. The dc motor drive also provides the high current torque, 400 % more than the rated continuous torque. Eddycurrent drives dont have any of those problems, as there are no high. Turbine supervisory instrumentation system selection guide, publication gmsi10sg002. As the leading supplier of eddy current adjustable speed drives, brakes and controls, dynamatic is your trusted resource for everything you need to keep your operations running strong. Our vast archive of product manuals, specifications and data, literature and videos is unparalleled. Eddy current controls adjustable speed drive controls. In fact, you can measure its driving voltage on motors with at least.
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