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Motors | Energy | Automation | Coatings WEG 14,000kw, 4 Pole, 45 Tonne Slipring Motor Supplied To Test Huge Compressors At MAN Turbo AG In Oberhausen
Motors | Energy | Automation | Coatings
Weg 14,000kw, 4 Pole, 45 Tonne Slipring Motor Supplied To Test Huge Compressors At MAN Turbo Ag In Oberhausen
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Weg germany gmbH has supplied a
45-tonne, 14,000kW, 10,000V high voltage
slipring motor for the testing of huge radial,
axial, and geared compressors at MAN
Turbo Ag’s Oberhausen plant.
Designed and manufactured by Weg to
exacting customer specifications, the ‘M’-
Line slip ring motor is special due to its
highly robust design, which enables it to
withstand the rigours of movement around
the test area, by cranes and lifting tools,
and yet still provide reliable operation under
severe test conditions. In addition, the
motor has two conical shafts, allowing the
connection of steam turbines or expanders
to the second shaft end, raising its
mechanical transfer rating to 20,000 KW.
Initially, MAN Turbo Ag was reluctant to
place such a strategically important order
for a test motor with a company it knew
little about. However Weg was able to
demonstrate its global manufacturing and
supply credentials to the Oberhausen-
based company, and this resulted in a
climate of trust being established with
technical personnel from Weg germany.
In addition, key personnel from MAN Turbo
also visited the test bed facility of Sulzer
Pumps, in Leeds in the UK, - where Weg
had supplied a similar but lower power
slipring motor - and talked with the test
field managers there to determine their
experiences with the Weg motor.
In addition to the facility for the year long
test programme, and the favourable
outcome from the Sulzer visit, the third
determining factor in MAN Turbo’s decision
to specify a Weg slipring motor was that
Weg is one of only three companies
worldwide with the know- how to design
a special machine that would satisfy MAN
Turbo Ag’s exacting specification.
Weg 14,000kw, 4 Pole, 45 Tonne Slipring Motor Supplied To Test Huge Compressors At MAN Turbo Ag In Oberhausen
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The largest motor ever built by Weg is a
slipring machine; it is used in a wind tunnel
for testing aircraft at high MACH numbers.
This motor, a 27,000kW, 12-pole, 11kV
machine, is 7-metres long by 5-metres
wide and weighs over 93 tonnes. The
increased power required for its operation
meant that it needed its own 132kV grid
connection. However, Weg was able to
provide a total solution based around
this requirement, by supplying a 35MVA
11kV/132 kV transformer with auto-tap
changer, allowing the client to reduce his
total installation costs substantially.
The MAN Turbo motor is also substantial;
a force- cooled unit, rated S1-100%
14,000 KW at F/F rise, from 1500rpm
down to 750 rpm, it weighs in at 45-
tonnes. Motors of this size are usually fixed
and operate continuously under normal
conditions. However, this is not the case
with the MAN Turbo motor; the 45-tonne
machine has to undergo the rigours of
being moved around by cranes and lifting
tools, and still performs reliably in the
severe and exacting conditions naturally
existing in field testing.
A slipring motor was specified by MAN
Turbo Ag, because the company has
experience of this motor type - albeit in
the lower power ranges - and has enjoyed
satisfactory results with them over many
years. Slipring motors are actually ideal for
MAN Turbo Ag’s test purposes, as they
do not suffer from any torque pulsations in
their drive train.
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The unusual specification of the MAN Turbo
slip ring motor is testament to the modular
nature of Weg’s ‘M’-Line of high voltage
motors. The flexible ‘M’ range design
enables the motor specification to be tightly
tailored to specific customer specifications.
The MAN Turbo motor is designed with
two conical shaft ends, to facilitate tests
in excess of the normal capacity of the
motor. In these tests, the second of the
conical shafts is attached to a turbine or
an additional motor to deliver the additional
power, raising the mechanical transfer
rating of this motor to 20,000kW.
Speed control of the motor is carried out
by a liquid rheostat. This unit has two
tanks for part and full load testing. The
speed range is 0 to 1500 rpm; with normal
operating in the 50% to 100% range, or
750rpm to 1500 rpm. Within this speed
range the motor operates with constant
torque. The option of a variable speed
drive was considered, but discounted,
as the investment was much higher, and
the possibility of encountering torque
problems, which can wreck compressor
blades, was also greater.
Following Weg’s delivery of the slip ring
motor, MAN Turbo commenced its year
long in-house testing programme, to
determine that the motor performance met
and exceeded all its requirements. The
testing procedure was entirely successful,
resulting in further purchases of Weg
equipment – motors and generators.
This association culminated in November
2008, when Weg germany gmbH signed
a framework agreement with MAN Turbo
Ag, making Weg one of the company’s
key electrical suppliers. Included in this
agreement are MAN Turbo Ag’s production
sites at Oberhausen, Berlin, Hamburg,
Zürich and Schio.
Commenting upon this achievement
Andreas Schulte Mesum, general Manager
energy Business of Weg germany gmbH
said: “Our appointment as a key electrical
supplier to MAN Turbo Ag is testament
both to the quality of our equipment and
to the technical expertise of our personnel.
germany is the largest market for electrical
equipment suppliers in europe, and to
achieve the breakthrough that we have
against strong competition is a terrific
achievement for Weg.”
“Our appointment as a key electrical supplier to MAN Turbo Ag is testament both to the quality of our equipment and to the technical expertise of our personnel. germany is the largest market for electrical equipment suppliers in europe, and to achieve the breakthrough that we have against strong competition is a terrific achievement for Weg.”
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