JP2584115Y2 - Toroidal coil - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal coil having a toroidal core wound.

[0002]

2. Description of the Related Art Most choke coils for line filters are toroidal coils. Toroidal coils include
There are a normal mode coil in which one winding is applied to a toroidal dust core, and a common mode coil in which two or three windings are applied to a toroidal ferrite core. These toroidal coils are wound up, and if necessary, are combined with a pedestal and arranged at predetermined positions.

[0003]

However, a toroidal coil generally generates heat due to electric resistance of a winding and magnetic loss of a core. Conventionally, no means has been taken to actively dissipate this heat, and the toroidal coil has been designed to have a required function in this equilibrium state because the temperature is higher than room temperature. In order to compensate for the characteristic deterioration due to the temperature rise, it was necessary to enlarge the core and increase the number of turns. In addition, there has been a problem that the temperature rise of the coil windings has an adverse effect on other circuit components.

Therefore, a technical problem of the present invention is to obtain a toroidal coil that suppresses a rise in temperature of a coil winding.

[0005]

According to the present invention, a toroidal coil in which a coil winding is applied to a toroidal core is made of a synthetic resin mixed with a powder having high thermal conductivity.
Radiator in which a number of radiating fins and hooking pieces are formed
Cover the coil winding using the elasticity of the heater itself
And a toroidal coil characterized by being fitted with the engaging piece .

[0006]

The heat generated in the coil winding through the radiator is efficiently radiated to the outside, so that the heat balance point of the coil winding is lowered.

[0007]

FIG. 1 is an exploded perspective view showing a toroidal coil according to an embodiment of the present invention, which is for a three-phase vertically installed type. In the figure, the winding 1 is shown simply, and its end is not shown. The toroidal coil according to the present embodiment is a three-phase toroidal common mode choke coil in which a radiator 3 is attached to an outer peripheral surface in combination with a box-shaped pedestal formed of two pedestal divided bodies 2 having the same shape and the same dimensions.

The radiator 3 is made by mixing a powder of a high thermal conductive ceramic such as aluminum nitride or alumina into a synthetic resin having high elasticity and good adhesiveness such as polyacetal (POM) resin and modified polyphenylene ether (PPE) resin. A large number of plate-shaped radiating fins 4 are provided radially on the outer surface of an arc-shaped thin plate of approximately a quarter of the circumference of the coil body, and a plurality of engaging pieces 5 are provided on the edge of the arc. Each structure is vertically suspended. In addition, the engagement piece 5 extends slightly inward.

The coil body has a Y-shaped center partition plate 7 (FIG. 1) which is integral with the core insulating case such that one of the partition tables 6 is directly above and the outer peripheral surfaces of the two windings 1 are almost exposed. (Part of which is shown) is supported by a pedestal at the center of both ends. The radiator 3 is attached to the winding 1 above by sandwiching the radiator 3 in the axial direction with the hooking piece 5 as shown in the drawing, and the portion of the hooking piece 5 is fixed by applying an adhesive. The radiator 3 may be fixed to the coil winding 1 by coating the inner surface of the radiator 3 with an adhesive mixed with a high thermal conductive ceramic powder.

Since the radiator 3 is made of a flexible synthetic resin, there is an advantage that the radiator 3 can be mounted on the outer peripheral surfaces having slightly different curvatures.

FIG. 2 shows a toroidal common mode choke coil according to another embodiment of the present invention, which is placed horizontally for use in a substrate type noise filter. Two windings 8 of the wound coil body
Radiator 9 (one is removed and shown)
This is a toroidal coil with.

The radiator 9 is made of the same synthetic resin material as described with reference to FIG. 1, and is provided at equal intervals on the surface of a partial annular thin plate slightly longer than the annular portion of the coil winding 8. The heat radiation fins 10 are provided, and the hooking pieces 11 are vertically provided at a total of three places near the center of the inner peripheral edge and near both ends of the outer peripheral edge. Hanging piece 11
Position and fix the radiator 9 in contact with the inner and outer peripheral surfaces of the winding 8.

Since the toroidal coil of the present invention has the radiator 9, the toroidal coil is applied to a board type noise filter which is mounted at a high density using a coil mounting insulating table having legs at four corners, and suppresses a temperature rise of the toroidal coil. it can.

[0014]

According to the present invention, since the heat radiator made of synthetic resin is attached, there is no fear of damaging the insulation of the coil winding, the weight is not increased, and the handling is easy. In addition, it is possible to provide a high-quality toroidal coil which can perform its function as designed and has little adverse effect on other electronic components.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a toroidal coil according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a state in which a toroidal coil according to another embodiment of the present invention is used for a substrate-type noise filter.

[Explanation of symbols]

 1,8 coil winding 2 pedestal divided body 3,9 radiator 4,10 radiator fin 5,11 hooking piece 6 partition 7 central partition

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01F 27/28 H01F 17/06

Claims (1)

(57) [Scope of request for utility model registration] In a toroidal coil in which a coil winding is applied to a toroidal core, powder having high thermal conductivity is mixed.
Formed of multiple synthetic fins and hanging pieces
The radiator that has been set is re-used by utilizing the elasticity of the radiator itself.
Fit the coil so that it covers the coil and attach with the hook
Toroidal coil, characterized in that digit.