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Litz Design

Typically, the design engineer requiring the use of Litz knows the operating frequency and RMS current required for the application. Since the primary benefit of a Litz conductor is thereduction of A.C. losses, the first consideration in any Litz design is the operating frequency. The operating frequency not only influences theactual Litz construction, but is also used to determine the individual wire gauge. Ratios of alternating-current resistance to direct-current resistance for an isolated solid round wire (H) in terms of a value (X) areshown in Table 1.

Table 1

operating frequency table 1

The value of X for copper wire is determined by Formula 1.

Formula for operating frequency

From Table 1 and other empirical data the following table of recommended wire gauges vs. frequency for most Litz constructions has been prepared.

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Table 2

operating frequency table 2

After the individual wire gauge has been determined and assuming that the Litz construction has been designed such that each strand tends to occupy all possible positions in the cable to approximately the same extent, the ratio of A.C. to D.C. resistance of an isolated Litz conductor can be determined from the following formula.

formula 2 of operating frequency