LITZ wires

Introduction

In an electrical winding, the number of turns and the magnetic flux are inversely proportional to the frequency of the current.

High frequency applications are increasingly widespread in the world of power electronics, their use greatly reduces dimensions. Working at higher frequencies means reducing the size of the transformer.

Litz cables (or Litz wires) fulfill this purpose perfectly. They consist of many strands of thin enamelled round wires, which are twisted and intertwined with each other.

Engineering

Hundreds or thousands of elementary conductors isolated from each other allows to reduce losses in the transmission of alternate current, avoiding the skin effect.

The concept behind the Litz cable is very simple: to constitute a stranded wire in which the fundamental units are enamelled wires with a diameter smaller than the skin effect.

 

 

In this way Litz wire will not suffer from this phenomenon and the losses in high frequency will be significantly reduced.

 

Below is an example of the possible solutions offered by De Angeli Prodotti:

Individual wire	Material	Spec. Resistance [Ωmm2/m]	Density [Kg/m3]	Diameter [mm]
	Copper	0.0171	8890	≥ 0.05
	Aluminium	0.0278	2700	≥ 0.2
Insulation  type for the individual wires	Name	Enamel type	Thermal class [°C]	Solderability
	Solvest F	PU	155	yes
	Solvest H	PU	180	yes
	Thervest/Adhexal	PEI+PAI	200	–
	Enamel build: Grade 1, Grade 2, Grade 3
External insulation type	Type	Thickness [µm]
	Polyester	23
	Nomex T410	50
	Polyimide	25 – 38 – 50
	Conductofol	90
	Mica-Glass	100
	And much more!	–
	Silicone extrusion after taping is possible

Advantages

Thanks to its extraordinary features, the litz allows to build electrical machines otherwise impossible with a traditional conductor.

The intertwining of hundreds or thousands of elementary conductors isolated from each other so this eliminates the skin effect and to work very well at frequencies up to 1 MHz.
Contact us to find the litz wire fitting your needs!