VOITH Vorecon Variable Speed Panetary Gear

8/9/2019 VOITH Vorecon Variable Speed Panetary Gear

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Vorecon –

Variable Speed Planetary Gear


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Vorecon –

developed for reliability

Voith Turbo is the leading manufacturer of hydrodynamic variable speed drives in

the world. Continuous development keeps our products at the leading edge of

technology. Sustained research, the most modern test and inspection facilities and

our comprehensive quality assurance system formed the basis for the development

of the Vorecon, the variable planetary gear from Voith. Drives with Vorecon – in

combination with a robust and simple electric motor – have proven themselves in a

wide variety of applications. Powers from 1,000 to 50,000 kW and speeds from

100 to 20,000 rpm can be achieved.

Well equipped for the most diverse

applications

Energy efficiency

■ Boiler feed pumps

■ Blowers

■ Coal mills

Oil, gas and petrochemical industries

■ Pipeline compressors

■ Process compressors

■ Refrigerant compressors

■ Hydrogen recycling compressors

■ LNG fuel gas compressors

■ LNG flash gas compressors

■ Pumps

Other industries

■ Compressors

■ Blowers

■ Pumps

Title page photo:

Vorecon type RWE

Pipeline compressor, Thailand

Power 9,955 kW,

Speed 9,053 rpm


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Highest security

for users and engineers

The operation of the Vorecon is based on the principle of power splitting.

This permits high efficiencies over a wide range of speed. In addition,

the Vorecon operates hydrodynamically – largely free of wear with

unsurpassed reliability. Thus the Vorecon offers you as an engineer,

manufacturer or plant operator critical advantages in comparison to

alternative drive systems.

Vorecon – a drive

with many applications

■ Reliability 99.97 %*

■ Availability including

overhaul intervals 99.8 %*

■ MTBF times of about 350,000 hours*

■ Very high efficiency

■ Excellent price/performance ratio.

■ Up to 8 years continuous operation between

overhauls

■ Suitable for use hazardous locations and dusty

environments at extreme temperatures

■ Compact and robust design

■ Simple maintenance

■ Precise speed control, highly dynamic

regulation

■ Vibration damping

■ Integral lube oil system for the entire drive train

■ Reliable availability of spare parts

*Determined on the basis of machines in service.

Efficiency characteristics of Vorecon and

geared variable speed coupling

100 %

80 %

60 %

40 %

0 %

E f fi c i e n c y

0 % 20 % 40 % 60 % 80 % 100 %

Load

Vorecon

Geared variable speed coupling

Vorecon on a test run in a high power test field


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Hydrodynamics and mechanics

perfectly combined

The Vorecon combines hydrodynamic components and a superimposed

planetary gear within a single housing. Its modular design permits an

individual combination of hydrodynamic and mechanical components,

depending on the requirements of the application. The advantages of

hydrodynamics and mechanics are perfectly combined in the Vorecon.

D A B C

Principle of power splitting,

schematic arrangement of Vorecon type RWE

A: Torque converter

B: Stationary planetary gear

C: Rotating planetary gear

D: Oil supply

Splitting from the converter to the gear

P i : Input power

P s: Superimposition power

Po: Output power

Function

The operation of the Vorecon is based on the

principle of power splitting.

Most of the power is transmitted mechanically

directly via the main shaft and the rotating

planetary gear. Only the power necessary for

adjusting the speed of the driven machine is split

off from the main shaft through the hydrodynamic

torque converter and superimposed into the

planetary gear. Utilization of the majority of the

mechanically transmitted power yields an overall

unit efficiency of more than 95 %.

Ps


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The output speed is controlled by varying the su-

perimposing speed. The maximum superimpos-

ing speed yields the highest output speed. A re-

duction or reversal of the superimposing speed

yields a reduced output speed. The variation inthe superimposing speed is achieved using the

adjustable guide vanes of the torque converter.

The working oil and lube oil are supplied by the

integral oil system. Both the motor and the driven

machine can be supplied with lube oil in this way.

Operating range of the Vorecon type RWE

no

ns

ni

n i : Input speed

n s: Superimposition speed

no: Output speed

Maximum output speed Reduced output speed

Internal gear Planet carrier

Planet gear Sun gear

1.2

R e l a t i v e

o u t p u t t o r q u

e

1.0

0.8

0.6

0.4

0.2

00.2 0.4 0.6 0.8 1.0

0 %

100 %

Relative output speed

Load torque

Torque converter guide vane setting

ni

no

ns


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The right solution for every application:

Various versions of Vorecon

Vorecon type RWE

Refrigerant compressor, Middle East

Power 6,966 kW,

Speed 8,879 rpm

Vorecon type RWC

Compressor test field, China

Power 30,000 kW,

Speed 6,000 rpm

Vorecon type RWC

Pipeline compressor, USA

Power 11,931 kW,

Speed 9 450 rpm

Type RWE

Type RWE is the most compact version of the

Vorecon. It consists of a hydrodynamic torque

converter, stationary planetary gear and rotating

planetary gear. Its short coaxial design requires

very little space.

■ Speed control range 60 –100 %

■ Areas of application:

– compressors– pumps

Type RWC

In addition to the torque converter, a hydrody-

namic variable speed coupling with an integral

lock up clutch is fitted to the RWC. This allows

relieved starting where the power supply is limit-

ed, or the mass moment of inertia is high. The

coupling remains drained while the motor is

starting up, thereby reducing the motor start-up

torque to a minimum. After the motor has started

up, the coupling is filled, the driven machine isaccelerated to its minimum speed and the the

lock up clutch is engaged.



– compressors

– pumps

RWCWE


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Type RWE..AB

In addition to the converter and planetary gear,

a bevel gear is connected to the output of the

Vorecon type RWE..AB. This makes it particularly

suitable for slow-running driven machines. In ad-

dition it is fitted with a hydrodynamic brake (re-

tarder), to bring the large mass of the driven ma-

chine quickly to a stop when it is switched off.

■

Speed control range 60 –100 %■ Areas of application:

– coal mills

Type RW

In addition to the torque converter, a hydrody-

namic variable speed coupling with an integral

lock up clutch and a hydrodynamic brake is fitted

to the RW. This arrangement allows a large con-

trol range from 10 to 100 percent speed, togeth-

er with completely relieved starting of the drive

motor. This gives the RW the largest control

range of the Vorecon versions.



– boiler feed pumps

– blowers

Vorecon type RW

Boiler feed pump, Germany

Power 8,500 kW,

Speed 5,000 rpm

Vorecon type RWE..AB

Coal mill, Germany

Power 1,330 kW,

Speed 475 rpm

RWE…ABW


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Voith Turbo GmbH & Co. KG

Variable-Speed Drives

Voithstr. 1

74564 Crailsheim, Germany

Tel. +49 7951 32-261

Fax +49 7951 32-650

[email protected]/variable-speed

Documents

VOITH Vorecon Variable Speed Panetary Gear