In radio amateur practice quite often there is need to manufacture the transformer with non-standard values of current and tension. It is good when it is possible to find the ready device with the required windings, in other case it is necessary to make it independently.
Instruction
1. Decide before calculation on the output data of future device. The transformer consists of magnetic conductor (core), primary (network) and secondary windings. Important feature when calculating the transformer is the choice of the core. Optimal variant is the core of armored type as, unlike toroidal, on it one and a half times less wire for production of windings is required. Choosing the core, be guided by thickness of set and width of its central plate. Determine area of cut as the work of thickness of set on plate width.
2. Make calculation of quantity of rounds of winding (ω) on 1 volt. It is calculated by formula: ω = S:50, where S – the area of cut of magnetic conductor in square centimeters. For this purpose measure the area of cut of the core, at the same time assume as a basis that 50 square centimeters = 1 round on volt. For example, if magnetic conductor section equally in 150 square centimeters, then on 1 volt (150:50) is necessary 3 rounds of wire.
3. Make calculation of primary (network) winding for voltage of 220 volts. Increase the value received in Paragraph 2 by 220. For example: 3х220=660 rounds of primary (network) winding.
4. Make calculation of secondary winding, proceeding from requirements. Increase the value received in Paragraph 2 by tension necessary to you. Let's say that voltage output has to be 80 volts, then 3х80=240 rounds of secondary winding. Thus, the lowering transformer with the entering voltage of 220 volts and tension at the exit of 80 volts, requires 660 rounds of primary (network) winding and 240 rounds of secondary winding of the isolated wire section 2 square millimeter.
5. Check upon termination of calculation window duty factor windings. It should not exceed 0.5, only then it is possible to start winding, otherwise it is necessary to take the core which has big area of cut and to anew make all calculations. Do not forget to consider at the same time isolation thickness. You make calculation of the raising transformer similarly.