This is frequently abused argument of fluid coupling manufacturers. Vorecon variable speed planetary gears Geared variable speed couplings Variable speed fluid couplings Hydrodynamic torque converters The Voith variable speed drives transmit power through moving fluid. Fluid couplings are used to provide gentle acceleration control, torque limiting control, load sharing control, and variable torque/speed control. themselves. Please click on the icon to find out more about our Variable speed fluid couplings services. 2. The variation of speed is obtained by varying the oil filling in the coupling. 7: One single VFD can soft start multiple motors and continuously drive one of them –> large space and cost savings. They link the drive machine – generally an electric motor – with the corresponding driven machine. With maintenance friendly design, good access to internal components, trained personnel and available critical spare parts the repair takes just few hours resulting is very short mean time to repair (MTTR). These are manufactured with great precision using best grade of raw materials and components under the guidance of quality professionals. KPTO: VARIABLE FILL FLUID COUPLINGS. Found inside – Page 3-32Gear box, this is not a true variable speed drive because it only enables variation of the speed in discrete steps. • Fluid coupling, or Variable Speed ... Fluid couplings larger than, say, 400 kW can be employed with ease in achieving the required speed control. It is based on the principles of a continuously variable transmission (CVT) popularised by DAF, but differs from other CVTs by using an unconventional type of steel chain consisting of parallel flat chain segments. The circuit includes two internal tanks connected by … Voith variable speed couplings are fluid couplings. Constant-fill Couplings Couplings of this type are mainly used for start-up (to limit torque) and to cushion the torsional vibration of the drive chain. First of all, its working principle is to fill the working chamber with a certain amount of working fluid (generally No. Or does anyone think that a remote compressor station as part of a gas pipeline is controlled manually by a personnel being locally present 24/7? Found inside – Page 3-47Variable speed pumps require either a variable speed fluid coupling between the pump and the motor or direct coupled DC motors , which operate at higher ... The speed variation in variable speed fluid coupling / scoop coupling is obtained by varying the oil filling in coupling through a sliding scoop tube when in operation. Gear Coupling. As such, it reaches high power density and is very compact. Max­imum protection against external factors, Energy savings and operating costs reduction, Long intervals between scheduled maintenance tasks, No additional investments over the entire lifetime, Overall load reduction, torsional vibrations and torque shocks dampening. On the other hand, some medium voltage VFDs are in operation for over 30 years. At this place we like to remind everyone dealing with such benchmarks that “typical catalog values” are not always the same as project specific values, especially if those values shall be guaranteed. FLUIDOMAT -SC is a variable speed fluid coupling providing stepless speed varying the oil filling in coupling through a … 2. Found inside – Page 115Regulation by varying speed –hydraulic / hydrostatic drive A hydraulic coupling is mounted between the pump and an induction motor. They operate very reliably without power electronics that are prone to interference. On the other hand, the start of the electric motor is still direct on-line with corresponding large starting current, thermal stress of the motor and voltage sag in the grid. Fluid coupling is based on hydro-kinetic principles and requires that the output speed be less than the input. Ourmain products Torque limiting variable speed fluid couplings, speed increasing gear variable speed fluid coupling, various couplings such as gear coupling, grid coupling, disc coupling and universal joints, industrial variable-frequency drives, brakes, valves, etc. However, the system consists not just of the fluid coupling alone. Found inside – Page 144Consider now an operation with variable input speed and torque but with a ... system [17] in which a hydrodynamic fluid coupling provides the variable speed ... KX series. Fig. Yes, the control system is something that usually becomes obsolete as the first thing. Found inside – Page 87A variable speed fluid coupling was submitted ATAC LL71 Unclassified report for determination of performance characteristics . This fluid coupling was ... Larger slip means that less motor power is transmitted to the output shaft and the difference are the losses heating up the fluid medium (usually oil). A fluid pump is drivingly connected to the engine crankshaft, and is adapted to drive a forward turbine and a reverse turbine. VFD is extremely flexible and versatile – various cooling concepts, multi-drive arrangement, soft starter with synchronous bypass, solutions for outdoor installations (“NEMA 3R enclosure [7]”) etc. Efficiency of fluid coupling drops as the speed is reduced. 6: Comparison – Power factor and reactive power consumption of electric VSD (VFD) and hydraulic VSD (fluid coupling); VFD with diode rectifier considered (for detailed explanation refer to our previous post [5]), Fig. Fluid coupling obviously does not have such option and to remove it from the shaft line would take few days. Comparison of VFD and gas turbine - MB Drive Services, Solutions for variable speed control: Intro. While the transmission is in gear, as engine speed increases, torque is transferred from the engine to the input shaft by the motion of the fluid, propelling the vehicle. As applied to high inertia rotating driven loads, fluid cou-plings are typically mounted between the prime mover and the driven load. 2% losses as part of speed conversion. And the rapid development in field of predictive maintenance and diagnostics open vast possibilities for further improvement. They link the drive machine – generally an electric motor – with the corresponding driven machine. ... is a fluid coupling with a special patented circuit designed to start up large inertia machines driven by eletric motors. pump torque flange. In our view, not surprising, VFD is the better option providing all the flexibility required and having answers to all challenges around integration of variable speed drive systems. The power is transferred through the fluid energy of the working fluid. Fluid coupling is a hydraulic variable speed drive. We invite you to click and explore our latest digital measurement system, OnCare.Health IOLIS. At half speed, the slip speed equals the output speed and so the losses are 50% of the input power. Note that e.g. A fluid coupling is also known as hydraulic coupling. Of course, there are always exceptions. Compact pressure-boosting system according to DIN 1988 and DIN EN 806, for direct or indirect connection. – Fluid coupling is much simpler solution compared to VFD. This fluid flows in an enclosed working chamber between the pump wheel (linked to the input shaft) and the turbine wheel (linked to the output shaft). Technologies. Please note that there is lot of information on the Internet that is not based on facts or physics. Products of NARA CORP. combined fluid coupling + planetary gear solution push their product very hard and often make deformed comparison with VFD. Use of such a drive allows the motor to accelerate without accelerating the driven load. Most VFDs do not require any harmonic filter. The LCI drives are being used since 1970s. In close casing are used to contain oil and other assembly parts. They are run with full oil or with just cooling oil. Before starting with the topic we want to refresh the meaning of some commonly used Read more…, https://www.youtube.com/watch?v=tfe2ym8ojOw, http://mb-drive-services.com/energy-efficiency-part-5/, http://mb-drive-services.com/choose-mv-vfd-cooling/, https://www.youtube.com/watch?v=NnvWYDbZKb4, http://mb-drive-services.com/energy-efficiency-part-6-power-factor-and-reactive-power-consumption/, https://mb-drive-services.com/experience-with-igct-based-vfd/, Right strategy to retrofit fix-speed motor into VFD operation. Fluid couplings constant filling fluid coupling where the oil filling is fixed. The rectifier technology (diode rectifier in combination with phase shifting transformer or active rectifier with harmonic elimination or minimization methods) fully complies to international standards such as IEEE 519, IEC 61000, G5/4 or others. the relative speed difference of the impeller section and the turbine section. Of course, … 1. It also does not solve the starting current issue and generally has lower power factor and much lower dynamics. The truth is that stall speed is a variable as a function of the engine’s constantly changing torque output as a race car travels down the track — that is where the science of torque converter “coupling” comes into play. On the other hand, fluid coupling might require additional power factor correction since power factor of asynchronous machine does not reach 0.95 as value requested by many utilities. Variable speed control is also possible. OnCare.Health IOLIS is a new digital measurement system for Voith variable speed fluid couplings. However, if the re-cooler is rated 900 kW and still the 12 MW fluid coupling claims to have 97% efficiency then something is really fishy. However, don’t forget that besides the fluid coupling there are additional components such as external re-cooler, oil filter, scoop tube for speed control and other. 4 5 7 1 2 3 6 8 1 Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing. Of course, above argumentation is an extreme simplification and it is not correct. Catalog. Found inside – Page 135... driven by constant - speed motors through variable speed fluid couplings . 2.3.4.2 The fluid couplings shall permit control of pump speed , and hence of ... These are manufactured with great precision using best grade of raw materials and components under the guidance of quality professionals. In similar absurd propaganda one could compare the fluid coupling to a conventional bicycle that is also a ‘purely mechanical device’. OUR PRODUCTS . Found inside – Page 57FIGURES FOR VARIABLE SPEED MOTORS IN BRACKETS WHERE DIFFERENT (50% DUTY ... of variable-speed motor IVSM) drive with induction motor plus fluid-coupling ... The dynamics is adjusted by control parameters and VFDs can be found in variety of industrial areas from low dynamic applications (most of pumps, fans and compressors) up to very high dynamic applications (steel rolling mills, specific test stands). If the fluid coupling has rating of 12 MW and efficiency of 97% then the losses make roughly 3% of transmitted power, i.e. The fluid coupling inherently provides soft torque transmission and reduces torque spikes on the load side. What is usually not much shown in the promotion videos is the control system of the fluid coupling. – Full starting torque from zero speed (if needed), – Inherent full motor protection (overload, unbalance, over-voltage, phase loss, stalling etc), – VFD location independent on motor location, – Multidrive option (footprint, cost and energy savings compared to individual VFDs for each motor), – High input power factor (> 0.95 for diode front end; 1.0 for active front end), – Output frequency can be higher than input frequency, – High accuracy of speed control without the need for speed sensor (encoder-less), – One single VFD can soft start load 1 and afterwards start-up and drive load 2 (e.g. Location. The work completed under this contract included the design, fabrication, and installation of a Variable Fill Fluid Coupling (VFFC) Fan Drive with Electronic Speed Control into the M113A1E1 Test Rig Vehicle, as well as dynamometer hot room ... Turbomachinery Laboratories. If sub-supplier of internal component is changed, backward compatibility is usually guaranteed. Voith variable speed couplings are fluid couplings. In fact, many customers require 25 or 30 years in their purchasing specifications and the VFD manufacturers obviously comply. Call us and we will help you! The award-winning products include fluid couplings, variable speed drives, Power take-offs, brakes, and hydraulic transmissions, and are designed for the most challenging applications. Resilient Mounts Product Selector Fluid Coupling Power Range Fixed speed: up to 1850 KW Variable speed: up to 11000 KW Speed Range Fixed speed: 720 RPM – 3600 RPM Variable speed: 490 RPM – 3600 RPM Starting torque range Fixed speed: 80% – 275% Both technologies, variable frequency drives and fluid couplings, are used in applications benefiting from speed control. This is not a marketing, but a fact confirmed by the extensive field experience [6]. Variable speed fluid drives, known as hydro-kinetic, are typically used in high horsepower (hp) applications. Oil is pumped from a sump to the hydrodynamic coupling circuit, Found inside – Page 220... speed command signal is compared with the generator revolution speed measuring signal of the M-G set fitted with a variable speed fluid coupling, ... The slip is proportional to the fluid level. The spares are available at least 10-15 years after the manufacturing of specific model is terminated. The KSL is highly efficient. Primarily used in pump and fan drive applications within the power, oil and gas industries as well as in the mining and material production industry. Both of them help to save energy and therefore conserve the environment. The variable Fill Scoop Fluid Coupling is therefore located between a constant speed motor and driven machine. They operate very reliably without power electronics that are prone to interference. The working circuit (12) is the chamber between the Impeller (4) and the Runner (5). Fixed speed: 80% – 275%. What are the benefits of transformer rental service? 2: Liquid cooled large capacity variable frequency drive. Stepless variable output speed of up to 5:1. Product Name : Fluid Coupling Type – SCR-24R,24X,25W,25B,26B. Nevertheless, we intend to provide an objective benchmark as far as possible. As an aside, the terms Fluid Coupling and Hydraulic Coupling are sometimes used interchangeably with Fluid Drive. A Hydro-kinetic Variable Speed Fluid Drive usually takes input power from a constant speed power source such as a motor of either induction or synchronous type and delivers variable speed power to a process pump. However, also the fluid coupling has a control system (at least a primitive one). Some manufacturers indicate up to 97%. They also provide a mechanical coupling between the drive and the load. Every fluid coupling has differing stall speeds, which is the highest speed that the pump can turn when the runner is locked and maximum input power is applied. In fact, the VFD manufacturer is probably in a better position to perform a control upgrade as this is his core competence and usually his own product. Variable speed hydraulic drive. The KPTO has been designed to meet the market requirements for a unit combining the technical features of a conventional Power Take-Off with the performances of a fluid coupling. In a narrow controlled speed range the fluid coupling reaches fairly high efficiency. There is no mechanical interconnection between the impeller and the rotor (i.e. The dc bus contains either a smoothing reactor (LCI) giving the VFD a character of current source or it contains set of dc smoothing capacitors (VSI) giving the VFD a character of voltage source. Found inside – Page 272variable-speed types and so-called 'dry-fluid' types charged with steel shot instead of the more usual oil. Any fluid coupling is, in essence, ... The power semiconductors, specifically thyristor based devices, do not age. High power VFDs are almost always liquid cooled. 8 Results. The power is transferred through the fluid energy of the working fluid. They especially like to compare their solution with the VFD alternative and claim the fluid coupling to be better in every single aspect. Bypass in VFD applications – What does it actually mean? Product key facts. The speed controller on a fan in an electrical generation plant in Brazil. In this type of couplings… Couplings . Variable Speed Fluid Couplings With Incorporated Gears Variable speed fluid couplings with incorporated gears are the workhorses for higher horsepowers and/or speeds, and combine variable couplings with sleeve bearings one or two steps of gear sets, all included in one housing Description; Description. The transmittable power … Fixed speed: 720 RPM – 3600 RPM. 1: Electric versus hydraulic variable speed technology. SC. Found inside – Page 130If possible, tests should also be carried out with varying spring pressures and surfaces with different ... Habicht, R. C. Variable-speed fluid couplings. At half speed, the slip speed equals the output speed and so the losses are 50% of the input power. Gas turbine is an Read more…, Solutions for variable speed control: Introduction This post introduces the most common solutions for variable speed control in industrial applications. Connecting a fixed speed motor hydrodynamically to industrial process equipment allows the motor to be started unloaded, with the load accelerated to speed. Found inside – Page 275Part 1: Manufacturing test method Variable speed fluid couplings and fluid coupling transmissions. Test. Part 2: Manufacturing test technical index Variable ... Variable Speed Fluid Couplings. It is the changing of direction of the fluid that makes the turbine to rotate. The impeller act as a pump and the runner acts as a turbine. FLUIDOMAT -SC is a variable speed fluid coupling providing stepless speed variation in a wide range when connected to fixed speed electric motor. This drive may be an eddy current clutch or a fluid clutch (sometimes called a fluid coupling). Variable speed technologies Comparison of VFD and fluid coupling VFD versus fluid coupling Today we open a topic that might polarize our readers: Comparison between variable frequency drive (VFD) and a fluid (hydrodynamic) coupling. ELECON make ESC series of Variable Fill Scoop Fluid Coupling provides step less speed variations when connected to a constant speed electric motor. A variable-speed fluid coupling also results in energy saving along the lines as discussed in Example 6.1. The coupling was put in service in May 2005. In a fault scenario it acts as kind of mechanical fuse and protects against overloads and transients. For horsepower ratings under this level, other methods of speed control are generally used. Of course, this blog is dedicated to VFDs. The Impeller is connected to a rotating scoop chamber that Product key facts Product description This is not a theoretical projection into the future but a fact based on field data. Found inside – Page 91Smooth starting is accomplished by the use of torque couplings. Fluid coupling, variable-speed hydraulic coupling, dry fluid coupling and centrifugal clutch ... If this is not acceptable, an additional starting system consisting of pony motor and synchronization equipment is required (increased footprint, cost and complexity). Voith Turbo Private Limited - Offering Variable Speed Fluid Couplings, फ्लूइड कपलिंग, Variable Speed Drives for Industrial Applications in Nacharam, Hyderabad, Telangana. Generally fluid coupling seems somewhat simpler – this is partly true. Consisting of non-self-priming, switched in parallel, vertically-mounted stainless steel high-pressure multistage centrifugal pumps in glanded versions, for which each pump is fitted with a frequency converter. Still, to be fair, the MTBF of a fluid coupling is in the range 25 to 40 years and therefore higher than the MTBF of a VFD with 8 to 12 years. The available speed regulation range depends on the type of load. On the other hand it must be inserted in the mechanical lineup and requires space in machine room. Found inside – Page 326Hydrodynamic variable speed couplings, often referred to as fluid couplings, are commonly used on conveyors. This type of coupling uses movable scoop tubes ... Get contact details and address| ID: 18894886462 Variable frequency drive might have slightly higher investment cost. With more than 15,000 units in use, the Voith variable speed fluid coupling re­presents one of the best documented options for controlling the speed of driven machines. EBARA pursues the kind of unique and distinctive technological development through collaboration between the product development divisions of the Companies and the Technologies, R&D Division’s EBARA Open Laboratory (EOL), which is Corporate head office’s organization. YOTcs650 Variable Speed Fluid Coupling How to realize the effect of energy saving and emission reduction for YOTC series variable speed hydraulic coupling? YOTGCD1000 YOTGCD1150 YOTGCD1250 Variable Speed Fluid Coupling Variable speed fluid coupling is mainly used for various fans, pumps and other equipment A certain amount of working fluid is filled into the working cavity of the variable speed turbo coupling. The trans­mittable power ranges from 100 kW up to over 65 MW. In practice there are two types of fluid couplings; Constant Filling, where the oil filling is fixed and variable filling also known as variable speed where the quantity of oil in the working circuit can be varied whilst running to give control over the amount of slip between the impeller and runner and so give speed regulation. The coupling fill level can be adjusted between 0 % and 100 % during operation, enabling precise and continuously variable driven machine speed control. However, exactly the same could happen with manufacturer of fluid coupling if it is some ‘garage company’. The difference between pump speed and turbine speed is the slip of the fluid coupling. A fluid coupling, often referred to as a fluid drive, is a device that uses oil to transmit rotation between shafts. For horsepower ratings under this level, other methods of speed control are generally used. Variable speed: 490 RPM – 3600 RPM. Voith Turbo is the leading manufacturer worldwide of hydrodynamic variable-speed couplings, geared variable-speed couplings, torque converters and Vorecon variable-speed planetary gears. The lifetime of VFD is at least 20 years. Found inside – Page 1168.56 The most simple variable speed hydraulic drive consists of a ... 8.58 Another style of hydraulic variable speed drive utilizes a fluid coupling similar ... Rotational speed: 1,000 rpm - 1,800 rpm. However, for availability the mean time to repair (MTTR) is equally important. When the demand increases and motor shall operate at full speed, the VFD can eventually synchronize it with the grid and get bypassed –> zero losses in VFD and input transformer at nominal speed. The constant power law still applies, but the power in the driven load is reduced with speed. Every day holds new challenges and we help you master them successfully. Sort by. But like a VFD, a fluid coupling is typically implemented It is mainly the auxiliary consumption. It is a hydrodynamic device used to transmit rotating mechanical power through the acceleration and deceleration of hydraulic fluid. On the other hand VFD has very flat efficiency curve. Variable Speed Fluid Couplingfor Two Pole Electric Motor Applications. Some manufacturers of fluid couplings have very aggressive marketing campaign (I tend to call it propaganda). Fluid coupling is a hydraulic variable speed drive. Found inside – Page 8484 Dynadrives fluid couplings which were highly technical in nature worked ... speed couplings in the range of 5 kw to 2,000 kw and variable speed couplings ... Starting torque range. Maximum output speed varied with input speed and output load. The hydraulic control was activated by a temperature sensing assembly. An electrically operated control was provided to stop the fan during deep water fording. The VFD is typically realized as indirect frequency converter (there are also direct frequency converters like cycloconverters, but their use is very rare). Moreover, VFD entirely protects the electric motor without the need for external protection elements. There is the oil pump, oil filters etc. The connections between the motor, coupling, and fan have been realized by gear couplings. Variable speed fluid coupling / Scoop coupling provides step less speed variation in a wide range when connected to fixed speed electric motor. System component supply is guaranteed and readily available as standard stock components are used and integration of the system into existing network systems is possible, via an Ethernet connection. fluid coupling to overcome problems experienced at “start-up” and “speed variation” operation for 4.4 Structure of the coupling designs 32 4.4.1 Constant-fi ll couplings 34 4.4.2 Variable-speed couplings 34 4.4.3 Clutch couplings 34 4.5 Hydrodynamic features, advantages and benefi ts 35 5 The fl uid coupling as soft-start and safety coupling 36 5.1 Fluid coupling with constant fi ll … hydrodynamic coupling KX series.
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