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22nd International Conference on Hydraulics and
Pneumatics
Energy saving hydraulic drives for industrial
machines
Tomáš Krannich
4.12.2013
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22nd International Conference on Hydraulics and
Pneumatics
ŽDAS LVH 2500
The machine is equipped with a lower hydraulic
drive. Spindle diameter 500 mm , slide speed
1 m / s
Technical parameters Rated deformation force (
tons ) 2500 Number of strokes ( 1/min )
20 Rated power stroke (kgm ) 35000 Stroke ( mm )
500 Slide area ( mm x mm ) 1050x1200 Gross
Vehicle Weight (kg ) 108400
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Braking large inertia
Mechanical energy
Hydraulic energy
Electric energy
Hydraulic accumulator
The braking resistor- It is used primarily as a
protection element
Second Recovery in el. network- The need for
phasing, especially for higher performance
Accumulation el. energy in batteries,
capacitors- High price and low capacity (large
number)
Power supply to other drive- Calculation of
operating parameters
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Energy recovery - Electric
Hydraulic circuits - closed
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Energy recovery - Electric
Hydraulic circuits - closed
Acceleration
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Energy recovery - Electric
b) Hydraulic circuits - closed
Decceleration
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Electro-hydraulic drive wiring diagram
1. Frequency convertor SKB3400075 2. Asynchronous
induction motor 1,1kW 3. Hydraulic generator
Parker PGM511
4. Hydraulic motor MRAK 6 5. Flywheel 6. 7.
Hydraulic valves
8. Boost pump 9. PC with measuring card 10.
Revolution, pressure sensors
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
STAND
II. Flywheel
II. PC with measuring card
II. Asynchronous induction motor 1,1kW
Braking resistor
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Energy flow of electro-hydraulic system in the
second phase flywheel deceleration
Schema at SW - Dynast
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
 
 
 
 
 
 
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Braking torque measurement
Torque of Hydromotor MRAK 6
Torque of Generator Parker PGM511
Torque Nm
Torque Nm


Time s
Time s
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Specified parameters
Scanning time
Tvz0.002
Starting time
TR0.8
Stabilization time
TD0.6
Braking time
TB0.8
No. of cycles
N5
Maximal RPM
nmax225
Minimal RPM
nmin60
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
STAND - adjustment
Flywheel 1 Diameter 400 mm Thickness 120 mm n
max 210 RPM Inertia 2,17 kg.m2 Maximum
kinetic energy 600 J
Flywheel 2 - Power supply to other drive
Dick 10 mm Diameter mm Number
Part 1 200 4 x
Part 2 150 2 x
Part 3 144 1 x
Part 4 125 1 x
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Flywheel 2
 
 
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Speed control - Matlab
The input values
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Conclusion
It was created stand for energy recovery -
Pressure / electricimportant parametersPerforman
ce - total power 1000 W - 600 JoulesFlywheel 1
- moment of inertia and speed 2.17 kg.m2, 210
RPMTorque - max braking time, maximum ? pressure
on HM 0.5 s, 80 bar Recovery.Current max 2A
at the time of 0.5 sThe longest recovery time of
about 1s at current cca 1AShattered energy in
the braking resistor - about 160 WEnergy
utilization for the second drive the size of the
flywheel 2 diametr 144, speed 700RPM
Energy saving hydraulic drives of industrial
machines
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22nd International Conference on Hydraulics and
Pneumatics
Thank you for your attention
Energy saving hydraulic drives of industrial
machines