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How is the number of turns of a toroidal transformer calculated?

Calculating the number of turns of a toroidal transformer requires the following steps:

1. Measure the length and cross-sectional area of the magnetic core. If you already know the core material, you can also find out the corresponding allowable flux density from the table.

2. Determine the required output voltage and input voltage, and determine the transformation ratio when designing the transformer. Transformation ratio is the ratio of output voltage to input voltage, and it is equal to the ratio of primary turns to secondary turns, that is: transformation ratio = output voltage / input voltage = primary turns / secondary turns

3. Calculate the average winding length of the transformer, the formula is as follows: average length = (2 × inner diameter + 2 × outer diameter + magnetic circuit height) ÷ 4

4. Use a constant or adjustable transformer power supply to energize one winding charged with a lower voltage (such as 10v), and measure the output voltage on the other winding.

5. Use the measured voltage **the following formula to calculate the specific number of turns of the winding: n= (output voltage/input voltage) × n'. n' is the number of turns obtained by measuring the auxiliary winding (this value is not necessarily very accurate, but it is enough for us to roughly calculate the number of turns of the transformer).

6. Repeat the above steps to calculate the number of turns of other windings to obtain the actual number of turns of each winding of the transformer.