Electrostatic shield
Copper foil between primary and secondary, earthed, to cut the noise that crosses by capacitive coupling. Typical in audio and instrumentation.
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Five families of toroidal winding
Every family starts from the same tape wound core and the same winding machine. What changes is what you need: the turns ratio, the insulation, the way the part ends up inside your machine.
The values shown are typical working ranges. Outside the range is not a no, it is a phone call.
01
Toroidal isolation and safety transformers
The part we make most. It separates your electronics from the mains, brings the voltage down to what you need, and does it with very low no load losses and almost no stray field.
- Single or dual primary for 230 V and 400 V mains
- Up to four independent secondaries on one core
- Electrostatic shield between primary and secondary on request
02
Toroidal autotransformers
When galvanic separation is not required and only the voltage has to be adapted, an autotransformer does the same job in less space and with less copper. Typical for imported machines brought onto European mains.
- Adaptation between 100 V, 110 V, 120 V, 220 V, 230 V and 240 V
- Fixed or switchable intermediate taps
- Higher efficiency and smaller envelope for the same rating
- Note: no galvanic separation from the mains
03
Inductors, line reactors and common mode chokes
Coils on ferrite or nanocrystalline toroidal cores, to smooth a current, limit a rate of rise or take conducted noise off the line.
- Ferrite, sendust and nanocrystalline cores
- Inductance to specification with a stated tolerance
- Bifilar winding for common mode chokes
- Value verified over frequency on the sample
04
Current transformers
High ratio windings for measuring a current without breaking the conductor. The primary is the busbar or cable that passes through the hole, the secondary is what we wind.
- Ratios from 1 to 100 up to 1 to 5000
- Ferrite or nanocrystalline core depending on the linearity required
- Through hole sized on your conductor
- Ratio calibration on the sample on request
05
Special coils and windings to order
Everything outside the four families above. Winding on cores you supply, rebuilding a part that is out of production, samples for laboratory work.
- Subcontract winding on your cores
- Reproduction of an obsolete part from the sample
- Minimum quantity: one piece
| Quantity | 1 piece to repeat runs |
|---|---|
| Wire | enamelled copper 0.08 mm to 3.00 mm, flat copper wire up to 5x2 mm |
| Core | supplied by us or on a subcontract basis |
| Documentation | test report and data sheet on request |
What we add when it is needed
Containment
Metal or plastic cup, full potting, rubber pad and central fixing bolt, brackets to your drawing.
All we are missing is your figure
Voltage, rating, available space. With three numbers we can start, the rest we work out.