 Magnetic
Material Div |
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VITROVAC
6025 Z - AMORPHOUS CORES & VITROPERM 500 Z - NANOCRYSTALLINE
CORES FOR MAGAMPS |
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Magnetic Amplifiers (MagAmps) made of amorphous and nanocrystalline
tape-wound cores are worldwide well established for precise
output voltage regulation in PC- and Server Switched Mode
Power Supplies, as well as Telecom and Industrial Power Supplies.
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VITROVAC
6025Z cores feature a highly square hysteresis loop, lowest
coercivity and lowest losses |
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VITROVAC
6025 Z and nanocrystalline VITROPERM 500 Z feature a highly
square hysteresis loop, lowest coercivity and lowest losses.
VITROPERM can be used up to an upper operational limit temperature
of 120 ¡ãC. |
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VITROPERM
500 F - NANOCRYSTALLINE TAPE-WOUND CORES FOR COMMON MODE CHOKES
- PLASTIC CASE AND EPOXY COATED CORES |
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Common Mode
Chokes with toroidal tape wound cores of VITROPERM allow the
ffective attenuation of asymmetrical and conducted high frequency
noise. The high permeability of the nanocrystalline core material
achieves superior characteristics at low and middle frequencies,
as well as in the high frequency range, when an optimized winding
arrangement is chosen. In comparison to conventional ferrite,
advantages over the entire frequency range are obtained.
All tape-wound cores listed below are inserted in plastic cases.
These allow best magnetic properties, offer good mechanical
protection and are suitable for direct winding. Epoxy coated
cores are listed in our VF-Core
Series.
All tape-wound cores listed below are epoxy coated and offer
a big winding area. The coating offers good mechanical protection
and is suitable for direct winding. However, additional isolation
means are recommended in case of enhanced isolation requirements.
VITROPERM cores in plastic cases are listed in the following
table Type
Series, cased Cores
The VF-Type Series is available in ¦Ì-levels of ¦Ì = 18 000, ¦Ì
= 30 000 und ¦Ì > 50 000, allowing a variety of industrial
solutions |
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CORES
FOR POWER TRANSFORMER |
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For the
supply of electrical devices and equipments in the industrial
range today almost exclusively switched mode power supplies
, which supply one or more DC output voltages, are used |
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Different
converter principles are in use, depending upon the power range.flyback
converters (to approx. 500W), single ended forward transformer
(to approx. 1000W) or push - pull converters (up to the KW range)
are common |
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Particularly
for push - pull converters, toroidal tape-wound cores made of
the nanocrystalline material VITROPERM are recommended. Advantages
over ferrites are achieved by the substantially higher induction
swing (high Bs) in connection with low hysteresis losses: lower
weight, smaller volume, higher efficiency and an extended temperature
range (to 120 ¡ãC) with negative coefficient |
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The advantages
mentioned are the more pronouncedly, the larger the transferred
power is |
| CURRENT
SENSORS |
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VAC current
sensors for the isolated measurement of high frequency currents
of arbitrary waveforms including DC are in use from the smallest
up to the highest power applications in industry |
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- three - phase drives, servo drives, generators
- power converters for DC - drives
- battery operated applications
- uninterruptable power supplies
- switched mode power supplies
- welding inverters
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| As the only
manufacturer worldwide, VAC offers high accuracy current sensors
which use a soft-magnetic probe instead of the hall generator
as the magnetic field detector in a compensation-type sensor |
| In comparison
with conventional sensors, our products offer some principle-related
advantages |
- very small offset current with negligibly long-term drift
- practically no temperature-dependent offset
- very small hysteresis of the offset current - high resolution
at low currents
- high usable temprature range (e.g. up to 110 ¡ãC in an
IGBT module)
- the magnetic module can be separated from the electronics
for applicational flexibility
- no electronics adjustment necessary
- attractively prized
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| The electronics
presented are intended for the operation with VAC passive current
sensors. Dependig on the type of electronics, one, two or three
sensor modules can be connected |
| CURRENT
TRANSFORMERS FOR ELECTRONIC WATT-HOUR METERS |
| Electronic
watt-hour meters have gradually been replacingthe electro-mechanical
Ferraris¨Cmeters in industry forsome years. Because of their
many advantages such asextended scope of functions with system
capabilities,insusceptibility to mechanical wear, small size
and higheraccuracy, they are also increasingly spread in privatehouseholds
all over the world. Their area of applicationcovers a wide range
from local individual devices throughpre-payment meters right
up to (supra)regional networkedremote control and readout systems. |
| One of the
key components in multi-phase and partly alsoin single-phase
meters is the current transducer. Thisprovides the electrical
network isolation and supplies anaccurate measuring variable
(signal voltage) for the primarycurrent. With respect to its
measuring error, it must meetthe requirements defined in the
various technical standardsfor the respective device accuracy
class. In Europe theseare usually the standards IEC 61036 for
directly connectedmeters and IEC 687 for indirectly connected
meters; forthe Anglo-American market the standards of the ANSIC12.xx
series for both types of connections. |
| There is
a number of principles for implementation of thecurrent transducer
of which the toroidal core currenttransformer with low burden
resistor has several obviousadvantages |
- closed magnetic circuit:less sensitive to interference
fieldsusually no shielding required
- magnetic function principle withoutsemiconductors:high
long-term stabilitylow need for additonal circuitry
- simple assembly with just a few parts:low assembly expenses,
compact designsattr active prices
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