Electrotechnical components
Strip Wound Cores
Introduction
Iskra, d. d. is one of the major Slovenian producers of various types of strip wound transformer cores made of oriented silicon
iron steel strip. With our own production line and highly trained personnel, we fulfill the requirements of local and foreign
markets.
To produce high-quality cores for transformer and chokes, we use an oriented silicon iron steel strip that contains 3% silicon. We
mainly produce cores from M103-27P and M089-27N materials. The strip thickness is 0.27 mm and can be used up to 200 Hz.
The grain oriented silicon iron steel strip Trafoperm N2 with thickness 0.1 mm cover the frequency range from 200 Hz to 2 kHz.
For the production of cores, we select our GOESS suppliers and ensure diligent control of production and the quality of the entire
working process. All cores are measured 100% by a computer controlled measurement system MDK1000A. The test reports are
available for our customers in PDF form.
We also offer our customers cores insulated with a polyester film (Mylar foil) or cores coated with epoxy resin. Both insulations
are provided with UL file numbers.
Our engineers use their knowledge and experience to offer the professional advice you need for the planning and selection of
cores to meet your requirements.
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? Rectangularcores
Rectangularcut cores
Oval cores
Oval cores with air gap
Standard cut cores: CM, CE, CG, C3U and C cores
Special cores according to customer demand
All types can be produced according to customer demand in various dimensionsandshapes.
The standard cores are available in quality »A« (unground) or quality »C« (ground). The codes in the table for standard cores are
intended for quality »A«.
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Strip wound cores for transformers and chokes
Additional services
Development of cores
Types of cores
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Electrotechnical components
Typical electromagnetic features of blank cores
Dimensions and tolerances
Material
External diameter - D
mm
M103-27P
M089-27N
Thickness
mm
Tolerance
mm
0.27
±0.4
±0.6
±1.0
±1.25
±1.5
±2.0
±2.5
±3.0
±3.5
±0.3
±0.5
±0.5
±0.75
±1.0
±1.3
±1.5
±2.0
±2.5
+0.3
+0.4
+0.6
+0.8
+1.0
+1.5
+1.5
+2.0
+2.5
0.27
Frequency
Hz
Internal diameter - d
mm
50
50
Field strenght
Hef (A/cm)
Tolerance
mm
Tolerance
mm
Height - h
mm
0.3
0.3
Minimum density
B(T)
1.6
1.4
Introduction
< 10
< 25
< 50
< 80
< 100
< 160
< 200
< 250
< 300
< 10
< 25
< 50
< 80
< 100
< 160
< 200
< 250
< 250
< 10
< 25
< 50
< 80
< 100
< 160
< 200
< 250
< 300
DimensionsRemarks
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Toroidalcoresaremostlyusedforpower and instrument
transformers, chokes and rotary transformers.
Weoffercoreswithvariousdimensions:externaldiameterfrom18
to300 mm,internaldiameterfrom 13 to 250 mm,heightfrom5to
105mm.
CoresareproducedinaccordancewiththeDIN 42311 standard
customer request.
Inordertoachievethebestqualityofcores,theD/d=1.25to 2ratio
mustbeestablished.Thestackingfactorçistheproportion
betweenthe��effectivemagnetizedaverageandgeometricalaverage
ofthecore.
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Electrotechnical components