Reactor unit

Abstract

A reactor unit includes a winding coil having aluminum wires wound around an iron core, and a copper-made electric terminal connected to end parts of the winding coil, in which the electric terminal has a pressing and connecting part for pressing and connecting aluminum wires of the winding coil at one end, and a welding part of a nearly flat shape at other end, so that the electrical connection between dissimilar materials is realized at low cost and high reliability.

Description

Technical field [0001] The present invention relates to a reactor used in electrical and electronic equipment, and more specifically, to a reactor unit provided with an electrical connection device between a winding coil wound by aluminum wire and a copper wire. Background technique [0002] Japanese Patent Laid-open Publication No. 1995-22258 shows an existing reactor with an electrical connection device between the winding coil and the copper wire. Figure 5 It is the main view of the existing reactor. [0003] Such as Figure 5 As shown, an iron core 2 is installed on the iron base 1, and a winding coil 4 is installed on the iron core 2. The winding coil 4 is wound by an aluminum wire 3 with a sintered paint film on the surface. The entire reactor needs to be varnished deal with. The reason why the winding coil 4 is composed of an aluminum wire 3 made of aluminum is that the aluminum wire 3 is more cost-effective than a copper wire. In recent years, the aluminum wire has been wid...

AI Technical Summary

Problems solved by technology

[0006] However, in the existing electrical connection device between the aluminum winding coil and the copper wire, the aluminum wire cannot be fixed on the copper electrical terminal with ordinary solder, so it is necessary to use a special solder material for aluminum wire, which will cause Problems such as higher cost than usual solder and difficult handling

[0007] In addition, when the heat of the winding coil is transferred to the terminal and thermal stress is applied to the electrical terminal, due to the difference in thermal expansion coefficients of aluminum and copper, cracks are prone to appear at the solder part, resulting in poor contact, so there are still reliability problems.

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