How to classify transformers

Classification and structure of transformers

Transformer classification

Classification by cooling method: dry (self-cooling) transformer, oil immersed (self-cooling) transformer, fluoride (evaporative cooling) transformer.

Classification by moisture-proof mode: open transformer, pot-sealed transformer, sealed transformer.

Classification by core or coil structure: core transformer, shell transformer, ring transformer, metal foil transformer.

The shell transformer core encloses the coil to form a shell; The core of the transformer is mostly in the coil, and only a part is used as a magnetic loop outside the coil.

According to the number of power phase classification: single-phase transformer, three-phase transformer, polyphase transformer.

Classification by use: power transformer, regulator transformer, audio transformer, medium frequency transformer, high frequency transformer, pulse transformer.

Transformer structure

The transformer is mainly composed of: magnetic core, skeleton, enameled wire, tape, sleeve, copper, insulating oil, etc., as shown in the following figure.

1. Core material selection basis:

1, operating frequency range;

2, saturation magnetic density (magnetic induction intensity) size;

3. Loss of magnetic core.

2. Core shape selection basis:

1, power density requirements;

2. Limitations on the height of the finished product;

3, how much winding;

4, the drawing form of enamelled wire. As shown below;

3. Transformer winding, mainly focus on the winding mode and the selection of enameled wire, about the copper wire diameter selection standard in the following details.