JPS5880819A - Air-core coil - Google Patents

Abstract

PURPOSE:To obtain the excellent heat radiating effect, by holding an electric member between two radiators constituted of non-ferrous metallic material which are semi-cylindrical and have heat radiating fins on the internal wall thereof resulting in cylindrical forms, and winding up winding materials on the outer periphery of the cylinders. CONSTITUTION:The numerical 1 is the heat radiator constituted of non-ferrous metallic material (e.g. aluminium, copper) which is semi-cylindrical and has heat radiating fins 2 on the internal wall and a flange 3 at both ends. In the part of mutual contact of two radiators 1, the insulation members 4 constituted of electric insulation materials (e.g. Teflon) wherein the section is T-shaped are held and formed to cylinders so that the induction current due to the magnetic flux may not short-circuit, and thereafter the external surface is surrounded by an insulation paper (e.g. kraft paper) 5, a winding material (e.g. formal wire) 6 is wound up, and the terminal thereof is projected from the outer periphery resulting in a lead wire 7. The numerical 8 is insulation resin (e.g. epoxy) applied on the outer periphery for protection.

Description

[Detailed description of the invention] This invention relates to an air-core coil.

For example, in an air-core coil used to drive a 400yis motor, the heat generated by the copper loss of the 2nd winding material (for example, formal wire) can cause damage to the winding material (for example, formal wire) and cause short circuit accidents. In order to prevent this from occurring, it is necessary to take cooling measures.

By the way, conventional air core coils are made of electrically insulating material.

In other words, it was formed by winding a winding material around a cylindrical bobbin made of a material with excellent heat conductivity (eg, phenol, Teflon).

However, the disadvantage of a configuration like 2 or more is that the winding material is wound around a bobbin made of a material with poor thermal conductivity, so almost no heat due to copper loss in the 9 winding material is transferred to the bobbin, and Even if air was blown using a cooling blower, no heat dissipation effect from the inner surface of the bobbin could be expected.

As a result, the heat was dissipated only from the outer circumferential surface of the air-core coil, and a large-capacity cooling blower had to be installed, which inevitably led to an increase in the size of the air-core coil storage case. . Furthermore, if the length l of the single winding material is long, the amount of heat generated due to copper loss increases in proportion to this, so there is a risk of short circuit accidents as described above, especially if sufficient cooling is not achieved. be.

This idea provides an air-core coil with excellent heat dissipation effect that solves the above-mentioned problems.

This will be explained in detail below with reference to embodiments shown in the figures.

In the figure, +11 is a heat radiator made of a non-ferrous metal material (for example, Alz, copper), which has a semi-cylindrical shape and has heat radiating fins on its inner wall and flanges (3) at both ends. At the part where the two heat radiators (1) are in contact, there is an induction due to magnetic flux.
so that the current does not short circuit.

An insulating member (4) made of an electrically insulating material (e.g. Teflon) having a T-shaped cross section is sandwiched to form a cylindrical shape, and the outer surface is surrounded with insulating paper (e.g. kraft paper) (5). Winding the winding material (for example, formal wire) 16),
The terminal is made to protrude from the outer periphery to serve as a lead wire (7). (8) Insulating resin coated on the outer periphery for protection (
For example, epoxy).

Since this invention has one or more configurations, heat due to copper loss in the winding material (6) is transferred to the heat sink (1) formed of a good thermal conductor.

By blowing air from the front axis direction of the heat radiating body (1) using a cooling blower (not shown), the heat of the winding material (6) can be dissipated very efficiently.

Therefore, it is possible to obtain the same cooling effect as the conventional cooling blower with a much smaller capacity than the conventional cooling blower.
The winding material +61 will not be damaged by fire.

Additionally, since the cooling blower is smaller, the air core coil storage case also becomes more compact.

In addition, in the embodiment, the above-mentioned flange (31) was provided in consideration of providing mounting brackets for mounting the air-core coil on both sides of the heat sink mountain, but this may not be provided.

[Brief explanation of drawings]

Figure 1 is a front view of the air-core coil according to this invention. FIG. 2 is a side view of FIG. 1, and FIG. 3 is a detailed view of the insulating member. In the figure, +11 is a heat sink, (2I is a heat sink, (3
; is a flange, (4) is an insulating member, (5) is an insulating paper, (
6) is the winding material, +71 is the material for the wire, (81 is the insulating resin. Identical or equivalent parts in Figure 2 are indicated with the same reference numerals. Agent Shin Kuzuno -

Claims (1)

[Claims] 21ri! is made of a non-ferrous wire mesh material that has a semi-cylindrical shape and has radiation fins on its inner wall. between the l heat sinks. An insulating member made of electrically insulating material is sandwiched and formed into a cylindrical shape,
This air-core coil is characterized by having a winding material wound around the outer circumference of the air-core coil.