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
- Self resetting thermal cutout or thermal fuse built into the winding
| Rating | 5 VA to 3000 VA |
|---|---|
| Primary voltage | 12 V to 480 V, single or dual |
| Secondary voltage | 2 V to 400 V, up to four outputs |
| Frequency | 50 Hz and 60 Hz, 400 Hz on request |
| Insulation class | B, F, H |
| Dielectric strength | 4 kV AC for one minute |
| Regulation | 3 to 12 per cent depending on rating |
| Terminations | flying leads, faston, terminal block |
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
| Rating | 50 VA to 3000 VA |
|---|---|
| Typical ratios | 230 V to 110 V and 115 V to 230 V |
| Taps | up to three, switchable on request |
| Frequency | 50 Hz and 60 Hz |
| Insulation class | B, F |
| Terminations | flying leads or terminal block |
03
Inductors, line reactors and common mode chokes
Coils on ferrite, iron powder or nanocrystalline toroidal cores, to smooth a current, limit a rate of rise or take conducted noise off the line.
- Ferrite, iron powder, sendust and nanocrystalline cores
- Inductance to specification with a stated tolerance
- Bifilar winding for common mode chokes
- Value verified over frequency on the sample
| Inductance | 10 uH to 500 mH |
|---|---|
| Current | 0.1 A to 60 A |
| Tolerance | 5 to 20 per cent depending on material |
| Core materials | ferrite, iron powder, sendust, nanocrystalline |
| Configurations | single, bifilar, three phase |
| Finishing | potting or cup on request |
04
Current transformers and sensors
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
| Ratio | 1:100 to 1:5000 |
|---|---|
| Primary current | 1 A to 600 A |
| Class | 0.5 to 3 depending on application |
| Hole diameter | 8 mm to 60 mm |
| Terminations | flying leads, pins for printed circuit board |
05
Special coils and windings to order
Everything outside the four families above. Air coils, 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
- Air coils and windings for laboratory testing
- Minimum quantity: one piece
| Quantity | 1 piece to repeat runs |
|---|---|
| Wire | enamelled copper 0.08 mm to 3.00 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
Thermal protection
Self resetting cutout, thermal fuse or a PTC sensor buried in the winding, set to the chosen thermal class.
Impregnation
Impregnating resin to lock the turns, improve heat transfer and take the mechanical hum out of the part under load.
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.