Cool Blue - MAGNETEC GmbH
Cool Blue - MAGNETEC GmbH
Cool Blue - MAGNETEC GmbH
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<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
Efficient and cost effective method to reduce damaging<br />
motor bearing currents in big inverter drive systems<br />
presented at PCIM 2005, Nuremberg, June 8<br />
<strong>Cool</strong> <strong>Blue</strong> ® Hans Joachim Pöss,<br />
cores <strong>MAGNETEC</strong><br />
to reduce motor <strong>GmbH</strong><br />
bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 1 of 18
The phenomenon<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
Motor bearing damages<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 2 of 18
V<br />
Motor axis<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
how can you measure the voltage across a bearing?<br />
motor<br />
Isolated<br />
motorbearing<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
Current<br />
probe<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 3 of 18<br />
A
Ceramic<br />
layer<br />
Effect even on Isolated bearings<br />
ball<br />
or<br />
roll<br />
axis<br />
oil film<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
motor case<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 4 of 18
Ceramic layer<br />
Ceramic bearing and oil film short cut<br />
motorcase<br />
axis<br />
oil film<br />
Cceramic<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
IGBT<br />
RFvoltage<br />
source<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 5 of 18<br />
Coil
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
How can we avoid these damaging currents ?<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 6 of 18
A view inside the motor<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
bearing current with filter<br />
cores<br />
without filter cores<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 7 of 18
Different solutions are possible<br />
3-phase motor filter<br />
pot cores<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
<strong>Cool</strong> <strong>Blue</strong> ® -cores<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 8 of 18
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
Why do <strong>Cool</strong> <strong>Blue</strong> ® provide the best solution ?<br />
low to no noise operation<br />
low leakage field<br />
low loss / cool operation<br />
small volume<br />
easy to mount<br />
can easily be re-tooled<br />
very good value for the money<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 9 of 18
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
How to use <strong>Cool</strong> <strong>Blue</strong> ® cores made of NANOPERM ®<br />
place core here,<br />
cover all wires<br />
but NOT the<br />
shielding (neural)<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 10 of 18
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
How to use <strong>Cool</strong> <strong>Blue</strong> ® cores made of NANOPERM ®<br />
NANOPERMcores<br />
over the<br />
motor wires<br />
U<br />
V<br />
W<br />
cable<br />
shields<br />
Cores operate as a common mode choke when being put over all motor cables<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 11 of 18
How to derive the right Setup of cores?<br />
B~U<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 12 of 18<br />
H ~I<br />
H ~ I<br />
Relate to the<br />
sum current<br />
L1+L2+L3<br />
B ~ U<br />
Relate to the<br />
inducted<br />
voltage in<br />
the core<br />
The amount of cores necessary depends on the sum-bearing current
Experimental approach<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
The inner diameter is defined by the<br />
cross section of the motor cables<br />
3-4 cores should be mounted<br />
together<br />
If the core temperature is > 120°C double the amount of cores<br />
If the temperature is still > 120°C select next bigger core size<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 13 of 18
Available round core standard range<br />
Outer<br />
diameter<br />
Inner<br />
diameter<br />
h Order no.<br />
p/n<br />
80 mm 63 30 M-113 6 A<br />
100 80 30 M-114 8 A<br />
130 100 30 M-115 9 A<br />
160 130 30 M-116 12 A<br />
200 175 30 M-117 16 A<br />
300 250 30 M-205 23 A<br />
More core types are available on request<br />
4 pieces are typically necessary<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
max. asymmetric current<br />
(sum-current Peak)<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 14 of 18
Available oval core standard range<br />
Outer<br />
diameter<br />
Inner<br />
diameter<br />
h Order no. max. asymmetric current<br />
(sum-current Peak)<br />
80 mm 63 30 M-283 6 A<br />
100 80 30 M-284 8 A<br />
130 100 20 M-142 9 A<br />
160 130 30 M-116 12 A<br />
240 200 30 M-111 19 A<br />
300 250 30 M-248 23 A<br />
More core types are available on request<br />
4 pieces are typically necessary<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 15 of 18
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
Motor bearing currents occur not only in Mega Watt – drives !<br />
In MW-drives the switching frequencies are at around 1 kHz<br />
In kW-drives the switiching frequencies are in the 10 kHz range !<br />
This causes motor bearing problems, too!<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 16 of 18
Conclusion<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores can increase motor bearing‘s lifetime<br />
up to factors compared to the actual standard.<br />
Example:<br />
A standstill in a paper factory for replacing the motor bearing<br />
costs about 10k€ per hour.<br />
The investment of some 100 € is a worth while<br />
maintenance measure - it will double the bearing‘s lifetime!<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 17 of 18
available at:<br />
More informtion<br />
www.coolbluecores.com<br />
visit our booth at hall 12 -525<br />
Thank you for your time !<br />
<strong>MAGNETEC</strong><br />
MAGNET-TECHNOLOGIE<br />
<strong>Cool</strong> <strong>Blue</strong> ® cores to reduce motor bearing voltages and -currents currents<br />
© <strong>MAGNETEC</strong> <strong>GmbH</strong>, Langenselbold www.magnetec.de Poess 18 of 18
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