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Litz wire losses

Litz wire is used to reduce winding losses at high frequency. Litz wire consists of 7 insulated transposed wires.

Problem type:
Axisymmetric problem of AC magnetics.

Geometry:
Litz wire losses Litz wire is used to reduce winding losses at high frequency. Litz wire consists of 7 insulated transposed wires. Core Solid wire sample Litz wire sample 5.8 mm Ø 4 mm

Given:
Core permeability μ = 2500,
Copper conductivity g=56e6 S/m,
Current I=1 A (RMS).
Conductor cross-sectional area S=0.126 mm2.
Frequency f=1 kHz.

Task:
Compare electric losses in the winding with solid wire and with litz wire.

Solution:
Each strand wire has its own label. The connection scheme is specified in external circuit file.

Results:
Comparison of losses in solid wire and in litz wire.

Frequency [kHz]

Solid wire losses [W]

Litz wire losses [W]

0

0.09

0.09

50

0.24

0.13

100

0.66

0.25

200

1.8

0.66

litz wire eddies

* Reference: http://en.wikipedia.org/wiki/Litz_wire

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