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Diy Electrical Appliances

August 12, 2017 18:07

Putting transformer in the home

There are situations in life when you need a transformer for a particular case.For example, the power burned tr-r favorite receiver, such as a replacement there, and to get the same opportunities there.But there are all sorts of other tr-ra from the old technology, are lying idle, so they can try to use as a donor, or to alter under specific parameters.Then we'll show you how to make a transformer with their hands in the home, providing all the necessary formulas and assembly instructions.

  • Settlement of the procedure of manufacturing

Estimated part

Let's start.A small digression to enter the state of affairs.Transformer - converter is one form of energy to another and back.It usually consists of two electrical coils (primary and secondary) and sheets of iron core.The primary winding induces a magnetic flux in the magnetic circuit, and that in turn induces an electric current in the second coil, as shown in the diagram below.

home-made product

Scheme of work

trance power depends on the size of the prostate, so the design and assembly are repelled by his presence to the core.Any calculation of winding units starts from calculating the overall capacity of the transformer.Therefore, in order to make the transformer improvised, first we need to find the power of the secondary circuit.If the voltage of the secondary coil is not alone, they need to be summarized.The calculation formula is of the form:

P2 = U2 * I2


  • U2 - the voltage on the secondary winding;
  • I2 - secondary current.

get the value, it is necessary to make the calculation of the primary winding, given the loss of transformation efficiency of 80% assumed.

P1 = P2 / 0.8 = 1.25 * P2

From power value P1 is selected core, its cross-sectional area S.

section Definition

S = √R1


  • S in centimeters;
  • P1 per watt.

can now learn effective transfer rate and energy transformation:

w '= 50 / S


  • 50 - is the network frequency;
  • S - iron section.

This formula has an approximate value of the result of the classical solution, but a homemade assembly and ease of solution is quite suitable.Finding a solution can proceed to the calculation of the number of turns, to make that possible by the formula:

w1 = w '* U1

w2 = w' * U2

w3 = w '* U3

Since the calculation we have simplified and small canvoltage sag under load, increase the number of turns by 10% of the calculated result.Next you need to correctly identify our current windings, based on the primary winding:

I1 = P1 / U1

determines the diameter of the wires of our formula:

d = 0.8 * √I

In Table 1, select the wire to the desired section.If the value is not appropriate, it is necessary to make a round up to the table diameter.

Table of sections

If we calculate the diameter is not in the table, or is too large to fill the window is obtained, it can take several smaller section wires and get the desired amount.

To see fit the coil at our makeshift transformer is needed to calculate the window area of ​​tr-ra, is formed in the core box which is placed coils.For a certain number of turns multiplied by the wire size and fill factor:

s = w * d² * 0.8

This calculation is made for all the windings, primary and secondary, then it is necessary to summarize the coil area, and make a comparison with the area of ​​the magnetic core window.core window must be greater than the sectional area of ​​coils.

Types of magnetic

procedure of manufacturing

Now, with calculations and material for assembly, you can start winding.On the prepared produce cardboard coil stacking the first coil.It is convenient to use an electric drill, holding the coil devices mounted in the chuck, fixing on a table or bench drill, at low speeds, make laying wires, one by one in a row.Between the layers settle down one wire insulation layer capacitor paper.Between the primary and secondary windings need to do two of the insulation layer.

winding technology

much easier if planning to rewind the finished transformer to the desired voltage.In this case, it suffices unwinding count the number of turns of the secondary winding, and knowing the transformation ratio:

w '= U2 / w2

can calculate the required number of turns for the required voltage:

w2 = w' * U2

recommend also view the video, which is clearly demonstrated by the transformer assembly procedure at home:

winding technology
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Test work

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this article is a guide, which is available explains how to make a transformer with their own hands at homeconditions.For example, we describe the sequence of calculation and assembly armor models, the most common type of transducer.Its popularity is due to the simplicity of manufacture of winding assemblies, ease of assembly, repair and rework.On the basis of this you can easily make homemade tr-p to charge a car battery, or to make a step-up transformers at district laboratory power supply, electric Vyzhigatel wood, hot knife cutting of foam or other device for the needs of the DIY.

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