Litz Wire Technical Information

We have a wonderful technical suport team at HSM Wire International, Inc.

Typically, the design engineer requiring the use of Litz knows the operating frequency and RMS current required for his application. Since the primary benefit of a Litz conductor is the reduction of AC losses, the first consideration in any Litz design is the operating frequency. The operating frequency not only influences the actual Litz construction, it also determines the individual wire gauge.

Ratios of alternating current resistance to direct current resistance for an insulated solid round wire (S) in terms of a value (X) are shown below:

Table A
Techtable Left   Techtable Right
X
0
0.5
0.6
0.7
0.8
0.9
1.0
 
S
1.0000
1.0003
1.0007
1.0012
1.0021
1.0034
1.0050
 
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The value of X for copper wire is determined by the following formula:
Formula for Wire    M = Wire diameter in mils

To see the rest of the calucation click on Litz Designing Calculations


The following table shows recommended frequency VS. wire gauges:

Table B



FREQUENCY


RECOMMENDED WIRE GAUGE

NOMINAL DIA.OVER COPPER

DC RES.OHMS/M'
(MAX)

SINGLE STRAND "S"
Rac Rdc

60 HZ to 1 KHZ

28 AWG

.0126

66.37

1.0000

1 KHZ to 10 KHZ

30 AWG

.0100

105.82

1.0000

10 KHZ to 20 KHZ

33 AWG

.0071

211.70

1.0000

20 KHz to 50 KHZ

36 AWG

.0050

431.90

1.0000

50 KHZ to 100 KHZ

38 AWG

.0040

681.90

1.0000

100 KHZ TO 200 KHZ

40 AWG

.0031

1152.30

1.0000

200 KHZ TO 350 KHZ

42 AWG

.0025

1801.0

1.0000

350 KHZ TO 850 KHZ

44 AWG

.0020

2873.0

1.0003

850 KHZ TO 1.4 MHZ

46 AWG

.0016

4544.0

1.0003

1.4 MHZ TO 2.8 MHZ

48 AWG

.0012

7285.0

1.0003

  In memory of Allen Richter, engineer, whose dedication and refined technical expertise richly served the electronics industry. His life's work with Kerrigan Lewis greatly contributed to the technological advances made by the Litz-wire industry.  


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