High Frequency Litz Wires (standard)

Technical information

HF stranded wires are manufactured from several individual enameled copper wires by twisting in accordance with
DIN 46447. For larger cables, different bundles of strands are combined with each other
. With this type of stranded wire/cable, the exact position of the individual wires is not defined.
To be fully effective, none of the fine wires must be interrupted. All wires
must be stripped at the ends and connected to the circuits. In this way
all individual conductors are connected in parallel. The higher quality in the high-frequency range is based
on the increase in the cross-section effectively involved in the current flow, which is limited in the solid wire
by the following effects: Skin effect
charge carrier displacement due to the magnetic field of the individual conductor. At high frequencies, most of the current flows along or near the surface of the conductor due to this effect. The loss resistance can be reduced by increasing the conductivity, especially of the surface, or by connecting many thin individual conductors (stranded wires) in parallel. Proximity effect
Charge carrier displacement to one side of the conductor by the magnetic field of a coil made from it, or currents running back and forth on both sides of the conductor due to an external time-varying magnetic field. Twisting direction
When stranding High Frequency Litz Wires, there is also the twisting direction parameter. It describes the direction in which the strand is twisted/twisted. A basic distinction is made between the lay directions S and Z.

Calculation of the nominal outer diameter of strands

The nominal outer diameter produced from individual enameled copper wires with textile braiding is determined approximately by the following formula.

Where : D = Nominal diameter of the insulated conductor (in mm) k = Compression factor n = Number of individual enameled copper wires d = Nominal diameter of an individual enameled copper wire

Measuring the strand diameter The strand diameter is the diameter of the circle drawn around the rope cross-section.

Lay length
The lay length of a specific strand layer in a wire rope is the pitch of the helical strands in this layer. Short lay length: high flexibility, good grip of the individual strands, better roundness of the strand. Long lay length: stiffer, less good grip of the individual strands, better fill factor. The lay length can be set between 1 mm and 500 mm. Possible tolerances ± 10% and ± 20% (standard). The specialists at the factory determine the lay length without your specifications.

HF stranded wires made of enameled copper wires (with and without additional insulation)

Manager

Banding

HF stranded wires round

Dimensions:

Cross-sections up to 2,000 mm2 max. diameter 65 mm max. diameter of individual wires from 0.032 mm to 4.00 mm

HF stranded wire

For space reasons, it is sometimes necessary to profile strands to create a rectangular or square profile instead of a round one. The following must be taken into account here:

Please always specify which dimension (width or height) must be adhered to (before any additional insulation).

Dimensions: Cross-sections up to 470 mm2 max. profiling: 40 x 25 mm max.

Diameter of enameled copper wires according to IEC 60317-0-1