The document summarizes the TAIFUN centrifugal pump concept, which uses a rotating magnetic field to drive the pump impeller synchronously like a magnetic coupling, but with the motor integrated in a canned design for safety. Key advantages are high efficiency due to synchronous operation, compact design, double safety barriers, and ability to customize flow with variable speed control. Initial prototypes were tested successfully in 2001 and the pump design has advantages over conventional canned motor pumps for chemical applications requiring temperatures up to 150°C.

1. TAIFUN®
from idea to product
WERNERT - PUMPEN GMBH

2. Until now: two drivers for
seal-less centrifugal pumps
• magnetic coupling
• asynchronous canned motor

3. Magnetic coupling - advantages
• no energy losses due to synchronous*
driving principle when using non-
metallic isolation shells.
• larger radial gaps don’t increase energy
loss, lead only to necessity of stronger
magnets.
• design of non-metallic pumps possible.
*outer and inner rotor show same speed

4. Magnetic coupling - disadvantages
broken
isolation shell:
fluid
contaminates atmosphere
= simple safety.
wasteful:
- 4 roller bearings
- 1 asynchronous driver
- 1 synchronous driver
Space
requirement.

5. Canned motor pump - advantages
broken
isolation shell:
fluid remains in the
outer safety barrier
compact
economical:
- 1 asynchronous
driver

6. Canned motor pump - disadvantages
• energy losses due to asynchronous*
driving principle ( eddy currents! )
• larger radial gaps ( required for SiC or
PFA ) lead to higher energy losses =
less efficiency.
• Heating up of the rotor does not allow
using thermoplastics like PFA.
• Fluid is heated up.
*outer and inner rotor do not show same speed = slip

7. Forget this...
The way to TAIFUN
.... and the second
skin for
improved safety.
Coils around the
isolation shell...
Wow, that’s
a lot of stuff....and this.

8. TAIFUN - the idea
The outer coils
produce a rotating
magnetic field for
the inner rotor,
which behaves like
it would do in a
magnetic coupled
pump.
Designing non-
metallic canned
motor pumps
becomes possible.

9. Excursus: electric coils
Coils, which are
passed by electric
current, will
generate a
magnetic field.
Alternating current
will generate an
alternating
magnetic field.

10. Excursus: rotating magnetic field

11. Driving scheme TAIFUN
3 groups of coils:
black,
yellow,
green.
All coils of same
colour are
parallel
connected.
The coil groups
are delta
connected.

12. Simulation of a 60° turn
Starting point:
full positive
phase at coil 1
End point:
full negative
phase at coil 1+ -

13. Calculating the supply frequency
In one frequency’s half-period the rotor turns 60°.
Then a full period will lead to a 120° turn. For a full
360° turn 3 periods of the frequency are needed.
At 3000 rpm the system will need 9000 periods per
minute, that is equal to 9000/ 60 s = 150 Hz.
Such frequencies need to be generated by a
frequency converter.

14. Advantages of the TAIFUN
concept
• Synchronous driver
– no eddy-current losses and heating-up of
the rotor and the fluid.
– excellent efficiency.
– allows large radial gaps for non-metallics.
• Integrated driver
– double hermetically tight.
– compact design.
– minimised mechanical losses.

15. Dimensions:
Conventional vs. TAIFUN
Same scale
Same size
50-32-200
Comparable
electric motor
15 kW

16. Disadvantage of the TAIFUN concept
• Needs to be operated with frequency
converter
– price of converter about Euro 2000,-
– installation of converter and special cabling
But - operating a pump with
frequency converter results in
a lot of benefits:

17. Advantages of using frequency converters
• Speed of pump is variable:
– Flow control by varying the speed
• mostly energy efficient = money.
• no throttle valves needed = money.
• uncertainty of head calculation tolerated = no trouble.
– Impeller diameter keeps constant. Pump can
replace any other of that type directly.
– Choice of design speed is free, e.g. 4375 rpm
• Converters intelligence is raising:
– Today: Integrated power control
– In future: Diagnostics and trend analyses.

18. Conditions: 7 Cent/kWh - Efficiency 45% - density of water
Example:
Saving 1,0 bar plants throttling
at 25 m³/h with TAIFUN
pays back
4.300,- Euro in 5 years.

19. Prototypes test run on 7.5.1999

20. The developing team.

21. 32 - 200 with integrated
13 kW - synchronous driver....
...in exact sizing to
ISO 2858

22. Presentation at ACHEMA 2000

23. ATEX tests on 2./3. Juli 2001
Measuring the maximum
surface temperatures

24. ATEX tests on 2./3. Juli 2001
Dry run test
The Ax-lock design
blocks the rotor after
approx. 30 sec , without damaging
further parts. Spare part costs:
€ 245,-
Absolut tight
without damaging
the inner savety zone

25. First TAIFUN in operation (3.8.2001)
BASF Pigment, Besigheim, Germany

26. Technical data TAIFUN 32-200
• Chemical pump to ISO 2858, size 50-32-200
• No design variations
• Fixed impeller diameter: 140 mm
• Maximum driver torque: 25 Nm
• Maximum fluid temperature: 150 °C (302°F)
• Max. environmental temperature: 40 °C (104°F)
• Integrated 13 kW driver certified to
II 2 G EEx de IIC T3-T6 ( PTB 01 ATEX 1094 )

27. Hydraulics TAIFUN 32
-200
• High speed =
Low torque =
less required magnetic
mass and better
hydraulic efficiency
• n = 1000 - 5000 rpm
• Q = 1 - 35 m³/h
• H = 5 - 80 m
• 3D - impeller for best
inlet flow conditions
• NPSHmax < 3 m
• Etatotal,max = 45%

28. Performance curves
TAIFUN 32-200

29. Stator
Driver (Stator):
• „Forbidden
zone“:
assembly only
by licensed
electricians/ for
opening
special-tool
required
• bearings not
part of this
zone

30. Outer
cover
Outer cover:
• Additional O-
Rings in case
that the
bearing zone
breaks
• GGG 40.3
and steel

31. Outer and
inner cover
• Flat seals
EURO-GYLON
blue
• PFA-lining
• sleeves out of
siliconcarbide,
not part of the
bearings
Inner cover:

32. Rotor with
bearings
• Magnets out of
Samarium
Cobalt
• Hollow shaft
with PFA-lining
• impeller and
adaptation
piece out of
massive PTFE
• O-Rings out of
FFKM
(Perfluorine-
elastomer)
• rotating
bearings out of
siliconcarbide
Rotor:

33. General view
TAIFUN®
• Static
bearings out
of carbonised
PTFE
• internal
flushing with
about 350 l/h
• not part of
the inner
cover
Bearings:

34. TAIFUN - your plant standard
• Highest safety standard, due to two
independent hermetically tight zones.
• Handles all corrosive and/ or toxic liquids up
to 150 °C
• Only few sizes without variations and with
fixed impeller diameter.
• Local flow conditions are adapted by
energy saving speed control.
• Take it from stock, put it in place, start.

35. The end.