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Comparison of variable low speed - high torque drives
Comparison of variable low speed - high torque drives
Electro-hydraulic direct drives
The drive consists of a power unit with a standard AC-induction electric motor run-ning at fixed speed driving a variable displacement hydraulic pump together with ahigh torque low speed hydraulic motor. (Fig 1).
The hydraulic motor is mounted directly to the driven shaft with a mechanicalcoupling or by splines. No gear reducer, belts, chain or sprockets are required. Thespeed of the driven shaft is determined by the variable flow from the hydraulicpump. The electro-hydraulic drive can operate continuously throughout the entirepower range up to approximately 200% of the rated torque from zero to full speed(Fig.2). The rated torque determines the size of hydraulic motor selected.
The drive can operate intermittently above the installed power rating, with the samelimitations as any fixed speed electric motor with the equivalent service factor. Thisdrive solution has a distinct advantage during lengthy acceleration cycles or duringoverload conditions. Loads that exceed the maximum torque requirement are effec-tively avoided by a pre-set pressure limiting function, which destrokes the pump.
The machine is also well protected from shock loads due to the low kinetic energyof the low speed motor. Because of this low moment of inertia, unlimited starts andstops are accepted without any restrictions. The standard drive can operate in bothdriving and braking mode, forward and reverse (4-quadrant drive) without any addi-tional or special accessories.
Electro-mechanical variable frequency AC drives
A variable frequency alternating current (VFAC) drive, consists of a frequency con-verter, an electric AC induction motor and a high speed coupling. For a low speedhigh torque drive a gear reducer together with a low speed coupling will have to beadded. (Fig 3).
The speed of the standard induction motor is controlled by regulating the fre-quency of the supply voltage. (Fig 4).
The controllable frequency range for heavy duty drives is considered to be from 0 to100 Hz. When running at 50 Hz the VFAC drive can operate continuously at 100 %of the electrical motor rated torque. At lower frequency/speed the continuous outputtorque is reduced (fig.4). At zero speed the max torque is limited to approximately60 % of rated torque for a self-ventilated induction motor.
The VFAC drive can intermittently operate above 100 % of rated torque, i.e up to150 % during 1 minute every 10 minutes. The starting torque can intermittently fora period of a few seconds only be in the 180-200 % range.
A VFAC drive selection must be based on its continuous torque capacity over theentire speed range. This is a most important consideration due to its limitations,especially at lower speeds, leading to oversizing.
Electro-mechanical DC drives
A direct current (DC) drive consists of an AC/DC converter, a DC electric motorand a high speed drive coupling. For a low speed high torque drive a gear reducertogether with a low speed drive coupling must be added. (Fig 5).
A DC-motor can operate continuously at constant torque up to 100% rated speed.Speeds above rated can also be obtained through field weakening, but the motor isnow limited to operate at constant power, see fig 6.
A DC-motor can operate intermittently above these limitations, but only with timerestrictions due to internal overheating of the windings. The shaft driven fan isinsufficient to control the temperature at lower speeds and usually forced cooling isincluded to improve lower speed performance.
A DC-motor is sensitive to harsh environments. In many applications an encloseddesign is necessary and forced cooling with filtered air becomes necessary.Conductive carbon dust is still generated internally from the brushes and the drivemust be stopped for cleaning on a regular basis.
COMPARISON OF VARIABLE LOW SPEED - HIGH TORQUE DRIVES
Gear reducers
Common to both VFAC and DC drives is the use of gear reducers to develop hightorque at low speed. The selected size of the gear reducer depends on the type ofapplication, prime mover, output torque, speed and required service life.
For continuous heavy-duty applications the reducer is normally oversized by afactor of 1.5-3.0. In very tough shock-load applications the factor can be evenhigher. The losses in a gear reducer depend mainly on the type of reducer and num-ber of reduction stages.
A standard helical or planetary gear reducer will have losses between 1-2 % perstage. For a 3-stage reducer the overall efficiency will be in the area of 95-97 % atrated output load. The losses in the reducer are not so much affected by the loadwhich means that the efficiency drops with output loads lower than rated (sizingfactor >1).
A gear reducer is normally selected with a higher rated output capacity than theaverage running condition, which means that the reducer will always be oversized.That will increase the weight and cost of the reducer and also reduce the overallefficiency.
CHARACTERISTICS OF VARIABLE SPEED DRIVES
Type of drive El-hydr direct drives VFAC DC
Rated power (kW) 0-1000 0-10000 0-10000
Starting torque capacity 200-250 180-200 200-250(% of rated torque) (no restrictions) (time restricted) (time restricted)
Start/stop frequency No limits Limited Limited
Shock load capacity No limits Limited ***) Limited***)
Maintenance Low Limited High
Harsh environment Not sensitive*) Sensitive Very sensitive
Foundation Not needed Needed **) Needed**)
*) If power unit is placed in an isolated cabinet or room.**) Unless shaft mounted gear reducer to be used.***) Affecting the gear reducer only.
Comparison of moment
of inertia for electro-hydraulic
and electro-mechanical
drives
Rated speed, %
Rated powerIntermittentoperating
range
Continuousoperating range
00 100
200
100
60
Rated Torque %
Rated Torque %
Rated Speed %Rated Speed %Rated Speed %
Fig. 1 Electro-hydraulic direct drive.Fig. 2 Electro-hydraulic direct
drive characteristics. Fig. 3 Variable frequency AC-drive (VFAC). Fig. 4 VFAC drive characteristics. Fig. 5 DC-drive Fig. 6 DC-drive characteristics.
Rated Torque %
HÄGGLUNDS DRIVES ABSE - 890 42 Mellansel
SWEDENwww.hagglunds.com
Intelligent PowerA family of products, de-signed to provide completehydraulic drive systems anddo away with the need for agearbox. These products cantransform a machine into anintelligent unit which auto-matically reacts to situations,improving production andeliminating bottlenecks.
The three series of motorsare truly shock resistant andprovide full torque fromstandstill. They are easy toinstall and have low mainte-nance requirements.
MarathonMarathon is a camring motorwith a rotating hollow shaft.Max torque: 1 400 000 Nm.Speed range:up to 125 rpm.
It is the obvious choice fortough industrial applicationsand provides many years ofreliable duty.
VikingViking is a camring motor witha rotating housing. Max torque: 151 000 Nm.Speed range: up to 200 rpm.
The Viking motor offers thebest tension control avai-
lable, and is applied in manywinch systems in marine andindustrial applications.
CompactCompact is a camring motorwith a rotating hollow shaft.Max torque: 73 500 Nm.Speed range:up to 280 rpm.
The Compact motor is atough and powerful solutionfor many industrial andmarine applications. It issmall, light and with un-beatable power to weightratio.
Power UnitA neat package designed toprovide variable hydraulic oilflow to the motors.
Low noise insulated cabi-net, easy maintenance andminimum floor space requi-red. Many combinations ofpower, flow and controlavailable.
Control SystemsSpider is a micro-processorbased drive control & moni-toring system.
MCA is an advancedmachine control system.
The leading supplier of completehydraulic drive systems
HÄGGLUNDS DRIVES AB
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POWER UNITS
Hägglunds Drives hydraulic motors are world-famousfor their reliability and performance. They provide thedriving force needed but they are only a part of thesystem.
If the drive is to function in an optimal way, thereliability and performance of the pump unit must besimilar to that of the hydraulic motor.
In the past we found when power units were suppliedby others that they did not match the requirementsneeded, for understandable reasons. So, to ensure thequality and realiability we developed our standardpower unit range, designed to match our motors inquality and performance.
Electric motor, pumps, oil tank, valves, and otherperipheral equipment, gathered together into one unit.Together with the hydraulic motor and a control unit,they form a complete drive system.
Today we have three types of power units. Theintegral type, with all the components fitted into acabinet.
Two types of open units, the HPU which is anhorizontal type using a closed loop system. TheLPPU is a low power power unit, up to 45 kW, usingan open loop system.
The advantages of the integral pump unit are the lownoise level, at the same time as all the parts areprotected against dirt, dust and water/moisture. Itrequires only a small space, can be positioned directlyadjacent to the hydraulic motor, and is very easy toinstall and maintain.
Irrespective of which variant is selected, the powerunit supplied is built to function properly with ourmotors. The whole system comes from one supplierwith the same high quality throughout the entire drivesystem.
Reliable and with good performance
Acomplete hydraulic drive system fromHägglunds Drives comprises a control sys-tem,electric motor, oil tank,pump andhydraulic motor. In most systems,the con-
trol system,electric motor, oil tank and pump are alllocated in a sound insulated cabinet.
The pump is driven by an electric motor that runs atfixed speed. The oil flow from the pump is controlledby the swash-plate angle, which can be changed by asignal from the control system.
The pump and hydraulic motor are connectedtogether by flexible hoses and/or by steel pipes. Theoil f lows from the pump to the motor in one of thehoses/steel pipes. The oil flows into the motor cylin-ders and presses the pistons radially out towards thecam ring. The cam ring is designed in such a way thatthe motor axle rotates and drives the shaft of themachine. The speed of the motor is controlled by theflow of oil into the motor.
An increase in the oil flow means a higher motorspeed and vice versa. The direction of rotation of themotor changes when the pump transfers the oil pres-sure to the other hydraulic hose/steel pipe to themotor. Both the hydraulic motor and the pump have avery low moment of inertia, which makes it possibleto stop or reverse direction quickly.
The second hydraulic hose/steel pipe is used as areturn line for the oil to the pump. A part of the returnflow is bled off into the tank where it is cooled andfiltered.
There is a third hose/steel pipe that returns drain oilfrom the motor to the tank.
This is how it works
Main components intwo door Power Unit
1. The free standing cabinet is built of a robust steelframework with sound insulated doors, panels andcover. It is surface treated to prevent corrosion andageing in tough process industry environments. Thesolution is an open one which simplifies accessibil-ity during maintenance and service.
2. The electric motor that we normally use has a highefficiency and is also extremely reliable.It is started at no load and runs at fixed speed.
3. The hydraulic pump is of the variable displacementaxial piston type with very fast acting pressurecompensator override.All controlling items are built on to keep pipeworkto an absolute minimum and electro-hydraulic stro-ker provides flow control by controlling pump dis-placement.
4. The tank is manufactured of stainless steel to pre-vent corrosion.
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Main components inthree door Power Unit
5. The oil filters are dimensioned for oils with highviscosity and a high degree of contaminationseparation. Duplex filters can be supplied as anoption,allowing you to replace filters duringoperation.
6. The oil cooler is dimensioned to maintain the oiltemperature in the hydraulic system at the correctlevel. In this way good lubrication characteristicsare ensured and the service life of the oil and of
the complete drive system will be long.
7. The control system is configurable for differenttypes applications,providing consistent start, stopsequences. The operation can be controlled byexternal signals or from the front panel of thecontrol system. Various operational parameters canbe displayed such as rpm,pressure, electric motorpower and self-diagnostics.
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Adapt your Power Unitdepending on the powerrequired by your system
A system of few components,but many combi-nations to provide any solution for the Hägglu-nds Drives performance range.
The Hägglunds Drives motors performancerange, demand, power and flow from singlepump systems with low flow to multi pump sys-tems with very high flow and power. Our powerunits are designed to suit all these demands withdifferent style and almost any combination ofpump/electric motor size. Our systems are userfriendly and can be adjusted or controlled tochange pressure and flow and therefore drivetorque, drive speed and hence drive power. It isquite easy to adjust or upgrade to suit changingproduction demands.
The controllability of hydraulic drives bringsversatility to machines which transform themfrom the slave of an operator into an intelligentproduction unit which can sense and react to sit-uations to improve production flow. Our drivecontrol Spider provides all the necessarystart/stop logic, system health monitoring andmachine control techniques.
The unit is easy to install,it is fully functiontested before delivery and takes a short time tocommission. Even on large machines installa-tion can be undertaken during a normal shut-down period so no production losses are experi-enced.
If r equired on truly critical applications astandby unit can be included to give security ofservice even after failure of a duty set.
Data
Dimensions
3) 200 kW electrical motor. 4) 250 kW electrical motor. 5) 315 kW electrical motor.
Cabinet size 1,3 Cabinet size 2,4, 5
1) Combinations of units for high power Power Units for applications up to 2-3 MW.
2) Only one set of electric motor/pump is permitted to operate. The other set serves as stand by.
3) Electric motor speed 1470 rpm
Type Max installed po wer 1)
kWMax oil flo w 3)
l/minMax contin uous
pressure , barWeight
kg
PEC 102PEC 202
9090
175337
350350
15001500
PEC 103PEC 203
90 (2x90) 2)
180 (2x90)175 (2x175) 2)
175 (2x175)350350
23002500
PEC 302PEC 402PEC 602
315315315
737737737
350350350
290030003000
PEC 303PEC 403PEC 603
400 (2x200)400 (2x200)630 (2x315)
674 (2x337)806 (2x403)
1474 (2x737)
350350350
360037005100
PEC 803PEC 1003
630 (2x315)630 (2x315)
1474 (2x737)1474 (2x737)
350350
55005500
Cabinet siz e 1 2 3 4 5
Type
Dim. mm
PEC 102PEC 202
PEC 103PEC 203
PEC 302PEC 402PEC 602
PEC 303PEC 403PEC 603
PEC 803PEC 1003
H 2320 23202600/2700 3)
2800 4)/2900 5)2600/2700 3)
2800 4)/2900 5)2700 3)/2800 4)
3000 5)
B 1500 2290 1670 2590 3100
A 1000 1000 1250 1250 1250
Possible combinationsSeries PA
1 = One electric motor/pump2 = Two electric motors/pumps - same or different
size can be selected.* Note only one set of electric motor/pump is permitted tooperate. The other set serves as stand by.
** 20% cooling power at max. installed electric power.*** Actual flow = theoretical flow · volymetric efficiency.
21880 (232,3)1770110-315**PA 500
2211735 (194,0)1470
222111633 (167,1)177075-250**PA 360
222111529(139,7)1470
222111440(116,2)177055-200**
PA 2502222111367 (96,9)1470
440 (116,2)177055-90
2*1367 (69,9)1470
22222111316 (83,4)177055-132**
PA 18022222111264 (69,7)1470
2222*1316 (83,4)177037-90
2222*2*11264 (69,7)1470
22222111231 (60,9)177055-110
PA 13022222111191 (50,4)1470
2222*1231 (60,9)177018,5-90
22222*11191 (50,4)1470
1003803603403303602402302203103202102Oil flo w***l/min(gpm)
Speedrpm
E. motorpower kWmin-max
Pump siz e
2222*2*1118,5
2222*2*1122
2222*2*1130
2221112*2*1137
2221112*2*1145
2221112*2*1155
222221112*2*1175
222221112*2*1190
22222111110
22222111132
22222111160
22222111200
222111250
222111315
Electric motorrelated po wer
kW (50 Hz)
1003803603403303602402302203103202102Power Unit PEC
5321Cabinet siz e 4
Possible combinationsGold cup
1 = One electric motor/pump2 = Two electric motors/pumps - same or different
size can be selected.* Note only one set of electric motor/pump is permitted tooperate. The other set serves as stand by.
** 20% cooling power at max. installed electric power.*** Actual flow = theoretical flow · volymetric efficiency.
222111881 (232,6)177075-315P30S-501
222111737 (194,6)1470
222111663 (167,1)177075-315P24S-403
222111592 (156,3)1470
2222111403 (106,4)177055-200
P14S-22922222111337 (88,9)1470
222*1211
1415522
2221113147022
2*12222111264 (69,7)1470
222*1316 (83,4)177037-90
2222*1264 (69,7)1470
2222*1209 (55,2)177018,5-90P7S-119
22222*1175 (46,2)1470
2222*1172 (45,4)177011-90P6S-98
22222*11144 (38,0)1470
1003803603403303602402302203103202102Oil flo w***l/min(gpm)
Speedrpm
E. motorpower kWmin-max
Pump siz e
2222*2*1111
2222*2*1115
2222*2*1118,5
2222*2*1122
2222*2*1130
2221112*2*1137
2221112*2*1145
2221112*2*1155
222221112*2*1175
222221112*2*1190
22222111110
22222111132
22222111160
22222111200
222111250
222111315
Electric motorrelated po wer
kW (50 Hz)
1003803603403303602402302203103202102Power Unit PEC
5321Cabinet siz e 4
Possible combinationsSeries 90
1 = One electric motor/pump2 = Two electric motors/pumps - same or different
size can be selected.* Note only one set of electric motor/pump is permitted tooperate. The other set serves as stand by.
** 20% cooling power at max. installed electric power.*** Actual flow = theoretical flow · volymetric efficiency.
90R180
22 111633 (167,1)177075-250**
222111529(139,7)1470
222*1440(116,2)177055-200**
90R130
2222*1367 (96,9)1470
2222*2*11440 (116,2)177055-90
2222*2*11367 (69,9)1470
2222*2*11316 (83,4)177055-132**
90R075
2222*2*11264 (69,7)1470
2*2*11316 (83,4)177037-90
2*2*11264 (69,7)1470
2*2*11231 (60,9)177055-110
90R042
2*2*11191 (50,4)1470
2*2*11231 (60,9)177018,5-90
22*11191 (50,4)1470
603403303602402302203103202102Oil flo w***l/min(gpm)
Speedrpm
E. motorpower kWmin-max
Pump siz e
22222117,5
222221111
222221115
222221118,5
222221122
222221130
222221137
222221145
222111221155
222111221175
222111221190
222111110
222111132
Electric motorrelated po wer kW
(50 Hz)
603403303602402302203103202102Power Unit PEC
321Cabinet siz e
90R100
90R055
4
Features
Standards· Totally-enclosed IP55,squirreled cageElectric motor. 4-pole.
· Axial piston pump with electro-hydraulic control.· Fast pressure compensator, charge pump and flushing valve.
· Motor/pump set mounted on anti vibrator pads.· All internal pipework and wiring included. The unit is fully tested prior to delivery.
· Tandem mounting possibilities.· Stainless steel oil tank.· Solenoid water valve.· Stainless steel water cooler.· Temperature switch. Two switches;- Start cooling
- Max temperature· 10 micron filters on returns and drain line with visual oil filter indicator, electrical filter switch andbypass valve on each filter.
· Suction line valve with switch.· Charge pressure switch.· Oil filling point with indicator.· Electric junction box, IP65.· Pressure gauger with push to read valve.
Options· Thermistor protection for electric motor.· Anti condensation heater.· Heating element electric motor.· Different pump controls.· Control system Spider.· Pressure transmitter.· High pressure switches.· Cabinet feet,anti vibrating mount.· Duplex oil filters.· Oil heater.· Air oil cooler.· Temperature switch.Three switches;- Start cooling
- Warning temperature- Max temperature
Five switches: - Min oil temperature- Start heater- Start cooling- Warning temperature- Max temperature
· Accumulator· Prepared for flushing of hydraulic motor case.· Piping on main lines.· Isolation valves.
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HÄGGLUNDS DRIVES ABSE - 890 42 Mellansel
SWEDENwww.hagglunds.com
Intelligent PowerA family of products, de-signed to provide completeDirect Hydraulic Drive,which do away with the needfor a gearbox. These productscan transform a machine toan intelligent production unitwhich automatically reacts todifferent situations andeliminates bottlenecks.
The three series of motorsare truly shock resistant andprovides full torque fromstandstill. They are easy toinstall and they also have lowmaintenance requirements.
MarathonMarathon is a camring motorwith a rotating hollow shaft.Max torque: 1 400 000 Nm.Speed range: up to 125 rpm.
It is the obvious choice fortough industrial applicationsand provides many years ofreliable duty.
VikingViking is a camring motor witha rotating housing. Max torque: 150 000 Nm.Speed range: up to 200 rpm.
The Viking motor revolu-tionized the hydraulic industry
in the 1960’s. It is still a best-seller and can be found in anumber of industrial andmarine applications.
CompactCompact is a camring motorwith a rotating hollow shaft.Max torque: 73 000 Nm.Speed range: up to 280 rpm.
The Compact motor is atough and powerful solutionfor many industrial andmarine applications. It issmall, light and with a un-beatable high power/weightratio.
Power UnitElectric motor, pumps,controlsystems,filters, oil tanks andall auxiliary systems in onecompact cabinet. All you haveto do is connect it to anelectricity supply. The servicerequirements are minimal.
SpiderSpider is a micro-processorbased drive control &monitoring system.
Control systems MCAMCA is an advanced machinecontrol system.
The leading supplier of completehydraulic drive systems
HÄGGLUNDS DRIVES AB
SPIDER
A Control System suitablefor advanced drives
Hägglunds Drives ABSE - 890 42 MellanselSwedenTel: +46 (0)660 870 00E-mail:[email protected]
ww
w.hagglunds.com
The Spider control system is easily connectedtogether with all types of Hägglunds Drives stan-dard pump units. The installation is easy and thelocation of the Spider is optional, e.g. inside or out-side the pump unit, fitted on a panel or in an adja-cent control room.
The advantages of the Spider control system aremany. It is small and compact and at the same timesuitable for many types of drive systems. Thanks toit´s software, the Spider can quickly and easily beconfigured to control various types of drive systems.
SimplicityThe outstanding feature of the Spider control systemis simplicity. It is easy to install, learn and use. Theinformation you need is shown on the displays andthe values needed for the current application are eas-ily set using the keypads or a standard PC. The com-pact design together with the fact that all the func-tions are available at one location, means that no
external control boards and cabling are required.The Spider is just as durable and robust as all
other products supplied by Hägglunds Drives. The unit can be used in tough environment as welloutdoors as indoors.
The Spider control system from HägglundsDrives provides total control of your drive system.Simple, fast and efficient.
Compact size❑ w 400 x h 300 x d 120❑ Flange for door or control desk mounting❑ Brackets for wall or inside power
unit mounting
Industrial design❑ Stainless steel enclosure❑ Protection class IP65❑ CE approved acc. to EMC directives
Supply voltage❑ Selectable 100, 115, 200, 230,
or 240 VAC❑ 50 or 60 Hz
Simple system configuration❑ Configured via front panel or via
PC interface❑ Password protected configuration
Control of one or two pumps❑ Single or dual coil pump control❑ Pump current or swashangle
feedback❑ Up to 0.8A output
Power unit health monitoring❑ Monitoring of power unit standard
switches❑ Configurable monitoring inputs❑ Text indication in selected language
on unit displays❑ Output grouped to Interlocking
(alarm) and Indication (warning) levels
Closed loop speed feedback❑ PID regulator❑ Digital or analogue speed encoder
inputs
Electric motor power limitation❑ Current transformer input❑ Limitation by pump swashangle control
Drive monitoring log❑ Alarm and Warning log❑ Time Counters❑ 4 scalable log channels❑ Output to PC in Excel format
Shredder control❑ Machine overload detection by
pressure switches, analogue pressure or speed
❑ Reversal counter
Friction control❑ Adjustable friction 0-200% for slave
Synchro control❑ Position control between two axis❑ Puls counter inputs
Display for drive 2 with two rows, each with 16large characters. The display can be configured toshow drive parameters such as rpm, pressure,electrical motor current etc. In the event of anyoperational disturbances, the display will showalarm messages.
Keypad for resetting alarms and drive 2 controlcommands.
Display for drive 1 with two rows, each with 16large characters. The display can be configured toshow drive parameters such as rpm, pressure,electrical motor current etc. In the event of anyoperational disturbances, the display will showalarm messages.
Keypad for configuration of functions for thecontrol system. During operation the keys areused to display and reset alarms and drive 1 con-trol commands.
Panel functions
Features
The control panel displays how thedrive system is working. Control andadjustment can easily be implemented.
Control of one or two pumps, simple systemconfiguration, Power Unit health monitoring,drive monitoring log...
The small and compact control box contains acontrol system suitable for advanced drives. Thehardware is always the same, the Spiders geniali-ty is in the software.
Irrespective of the type of drive, the Spider canquickly and simply be set for control. There are anumber of different pre-programmed options:
Monitor - Functions for control of one or two pumpsand health monitoring of the pump unit.
Basic - Includes basic functions for a large numberof standard industrial drives.
Shredder - Contains automatic machine overloadreversing, and other functions suitable for crusherdrive systems.
Friction - Infinitely variable friction ratio controlbetween two axis, suitable for rolling mills, calen-ders and similar type of machines.
Syncro - Position, offset and friction controlbetween two axis, suitable for rubber mixers andsimilar types of machines.
The function requirements can be fulfilled for alarge number of current industrial applications withthese software options.
The webmaster
Just like a spider is fully aware of what ishappening in his web, our Spider is alwaysin full control of your drive system.
The Spider control system is easy to install, learn and use.The information you need is shown on the displays.
Mounted inside Power Unit
Wall mounted in a twin screw sheeter application,tyre production
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Max PerformanceWe named our new mascot Max,and the reason for this is simple.Our drive is to improve yourperformance. To maximise youroutput. To deliver maximumreliability. To give you maximumpeace of mind and to bring youmaximum profits.
By the way, Max´s last nameis Hägglunds and you will meethim on our Web site.
Complete DriveSystemsWe would like to provide acomplete drive system to you.Perfectly matched to your needs.That includes piping, installationand commissioning. To providefor all your needs.
But of course you can buy ourproducts separately, if you wouldlike to.
Our products are designed togive direct hydraulic drive tomany applications, eliminatingthe need of gearboxes. Youachieve benefits of simplicity,saving space, improved control,reduced costs and gain highreliability with low maintenancein almost any environment.
MarathonMarathon is a line of cam-ringmotors with a rotating hollowshaft. Torque: up to 1 400 000Nm. Speed range: up to 130 rpm.
It is the obvious choice for toughindustrial applications and provi-des many years of reliable duty.
VikingViking is a line of cam-ringmotors with a rotating housing.Torque: up to 151 000 Nm.Speed range: up to 200 rpm.The Viking motor offers thebest tension control available,and is applied in many winchsystems in marine and industrialapplications.
CompactCompact is a line of cam-ring-motors with a rotating hollowshaft. Torque: up to 73 500 Nm.Speed range: up to 280 rpm.The Compact motor is a toughand powerful solution for manyindustrial and marine applica-tions. It is compact, versatileand with unbeatable power toweight ratio.
Power UnitA neat package designed toprovide variable hydraulic oilflow to the motors. Low noiseinsulated weatherproof cabinet,easy maintenance and minimumfloor space required. Manycombinations of power, flowand control available.
Control SystemsSpider is a modern configurablemicro-controller based drivecontrol & monitoring system.
The MCA is an advanced PLCmachine control system.
This is how it worksA complete drive system fromHägglunds comprises the drivemotor with mounting accesso-ries, a control system, a power
unit with electric motor, oiltank, pump, oil conditioningand instrumentation.
The pump is driven by theelectric motor at constant speed.The oil flow to the drive motorfrom the axial piston pump iscontrolled electronically. Takingthe pump swash-plate overcentrechanges the direction of thedrive.
The oil pressure forces thepistons radially outwards againstthe cam ring, creating the torquewhich is proportional to thepressure applied. The motor
cylinder block directly coupledto the shaft rotates the machineand the body is held by a torquearm or bracket.
The speed of the drive isdirectly related to the flow fromthe pump. Therefore, the power,speed and torque are easilycontrolled. This hydraulic closedloop system provides a highlydynamic four quadrant drivewith driving and braking inforward and reverse.
The motor and the pump havea very low moment of inertia,which makes it possible to stopor reverse quickly. The extremelyfast pump pressure controlremoves unwanted transientsof stresses and strains on themachine.
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Hägglunds Drives ABSE-890 42 Mellansel, SWEDENTel: + 46 (0)660 870 00. E-mail: [email protected]
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Our Drive is your Performance.
FEEDER DRIVES
The Feeder Drives system fromHägglunds Drives consists of ahigh torque hydraulic motor, ahydraulic pump, an oil reservoirand a control system. Flexiblehoses and/or steel pipes connectthe hydraulic motor and thepump to each other. The powerunit, which can be mounted re-motely from the motor, supplieshydraulic oil to the motor asdemanded, by a control signal.
Hydraulic motorsThe hydraulic motor is of theradial piston cam curve designand mounted by virtue of its inte-gral coupling (or optional inter-nal splines) directly on the drivenshaft without coupling arrange-
ments or gearboxes.
A torque arm is utili-sed to counter the
reaction forcewhilst elimina-ting any undesi-rable forceson the mainmotor bea-rings.
Powerunits
The powerunit is a fullyself contained
skid mountedunit. It is an open
loop hydraulic sys-tem designed for con-
tinuous duty industrialdrive applications.
The power unit consists main-ly of an electric motor, a hydrau-
lic pump, an oil reservoir anddirectional control valves. Thehydraulic system is continuallymonitored by virtue of variousswitches in the power unit. These
switches monitor conditions suchas temperature, oil level etc.
Electrical controls
The drive offers the possibility ofeither fixed, trimmable or fullyvariable speed control. Thedifference being by virtue of thetype of directional control valvesutilised in the system.
Drive functionThe power unit´s prime mover isan AC induction motor, whichruns at constant speed driving thehydraulic pump.
The hydraulic motor mounted onthe driven machine shaft turnsonly when the pump/valvereceives the demand signal andflow is generated. There is noneed to start/stop the electricmotor, only to zero the signal tothe pump/valve. This techniqueeliminates high current spikesand utilises AC induction electricmotors very efficiently.
THIS IS HOW IT WORKS
OPERATING RANGE
Max output torque (Nm) at max pressure.
Speed (rpm)
Explanation of the diagram
The graphs show output torque and speed at motor shaft for power units with an
installed power of 11 up to 45 kW.
The max torque figure for each motor is valid at a hydraulic pressure of approximately 350 bar.
These maximum torque figures are for intermittent use only and can not
be used for continuous operation.
For final selection of drive, please contact your Hägglunds Drives representative.
Rated Max Specific Max Displace-speed speed torque pressure mentrev/min rev/min Nm/bar bar cm/rev
MBL 283 6 8 283 350 17 768MBL 400 6 8 400 350 25 145MBL 566 6 8 566 350 35 561MBL 800 6 8 800 350 50 265
Data:
MBL 800
MBL 566
MBL 400
MBL 283
11 kW
15 kW
18,5 kW
22 kW
30 kW
37 kW 45 kW
YOUR OPTIONSTank-sizesPumps
The pumps above are highpressure axial piston pumpswith adjustable displacement,operating on the swash-plateprincipe. They are equippedwith pressure compensators.
A mobile version of vanepump with fixed displacementis also available. It is notequipped with pressure com-pensator.
There are two sizes of tanks avai-lable, 100 litres and 300 litres.
A very simple rule is that thevolume of the tank should be atleast two times the main flow perminute to get low flow speed forthe oil in the tank to avoid air andcontamination within the oil.
The tank is equipped with: ❑ visual level gauge❑ level switch (two levels)❑ temperature switch with
visual indication❑ air breather filter ❑ drain tap❑ filling point with quick
release coupling
Control Systems
The choice of electrical controlsystem depends on the operatio-nal requirements. ❑ speed control required❑ number of electric motors❑ level of health monitoring❑ interfacing with other items❑ accuracy of speed control
There are also several other con-cerns e.g.environment and space.
The levels of control can beenhanced or reduced. HägglundsDrives will make recommenda-tions as to the minimum levelthat should be considered.
It is also possible to use systemsprovided by the customer.
Hägglunds Drives AB, Mellansel, is certified by DNV according to the rules
of SS-EN ISO 9001 since 1992.
Marathon MotorsMBL 283/ MBL 400/ MBL 566/ MBL 800
Marathonhydraulicmotors areradial-pistontype with astationaryhousing anda rotatingshaft.
Starting torquecapacityThe hydraulic drive has theability to provide full startingtorque without time restrictions.This is an important feature inapplications when the machine isrequired to start up under fullload. The ability of the hydraulicdrive to develop continuous over-load torque without limitationmeans undesirable trip outs areavoided.
Start/stop frequencyThe hydraulic drive canstop/start on unlimited numberof times.The electric motor runs conti-nuously at fixed speed, driving
the pump. The speed and thestarts and stops, are controlled bythe signal to the direction controlvalve without changing the speedof the electrical motor.
Low speed hightorque capacityThe hydraulic drive can operateat maximum torque and zerospeed without time restriction.The hydraulic motor is mounteddirectly onto the feeder drive
shaft, offering a compact driveunit with no alignment problemsand completely maintenancefree. The hydraulic motor can
develop its exceptionally hightorque from zero speed.
Shock loadprotectionThe hydraulic drive isinsensitive for high shock loads.A hydraulic drive without gearreducer has approximately 1/500thof the inertia of an equivalent high-speed drive with gear reducer.
Sudden stalls or overloads areabsorbed by the hydraulic systemas the drives come to an instan-taneous stop, eliminating high
transient stresses and strains onequipment.
ControllabilityThe above features offer theoperator infinite capabilitieswith regards to interfacing thedriven machine control with forexample the plant processcontrol requirements. It is an extremely user friendlysystem.
FEATURES
HÄGGLUNDS DRIVES ABSE - 890 42 Mellansel
SWEDENwww.hagglunds.com
Intelligent PowerA family of products, de-signed to provide completehydraulic drive systems anddo away with the need for agearbox. These products cantransform a machine into anintelligent unit which auto-matically reacts to situations,improving production andeliminating bottlenecks.
The three series of motorsare truly shock resistant andprovide full torque fromstandstill. They are easy toinstall and have low mainte-nance requirements.
MarathonMarathon is a camring motorwith a rotating hollow shaft.Max torque: 1 400 000 Nm.Speed range:up to 125 rpm.
It is the obvious choice fortough industrial applicationsand provides many years ofreliable duty.
VikingViking is a camring motor witha rotating housing. Max torque: 150 000 Nm.Speed range: up to 200 rpm.
The Viking motor offers thebest tension control avai-
lable, and is applied in manywinch systems in marine andindustrial applications.
CompactCompact is a camring motorwith a rotating hollow shaft.Max torque: 73 000 Nm.Speed range:up to 280 rpm.
The Compact motor is atough and powerful solutionfor many industrial andmarine applications. It issmall, light and with un-beatable power to weightratio.
Power UnitA neat package designed toprovide variable hydraulic oilflow to the motors.
Low noise insulated cabi-net, easy maintenance andminimum floor space requi-red. Many combinations ofpower, flow and control available.
Control SystemsSpider is a micro-processorbased drive control & moni-toring system.
MCA is an advancedmachine control system.
The leading supplier of completehydraulic drive systems
HÄGGLUNDS DRIVES AB
EN
628
-1A
. R
epro
: Ö
viks
Rep
ro.
Prin
ter:
Ågr
ens
Tryc
keri
AB
1999
.
