JP3476229B2 - Box noise filter for large current - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-current noise filter using a box-shaped metal container provided with an external connection terminal, which is connected to a choke coil in the container and to an external connection. It relates to a connection structure with a terminal. 2. Description of the Related Art Conventional large current box-shaped noise filters are:
A common mode choke coil in which two or three thick electric wires are manually wound around a toroidal core, and a box-shaped metal container with an open upper surface, external connection terminals penetrating through the opposing side walls, and an inner surface covered with insulating paper. Then, it was housed together with other filter elements such as a capacitor and connected to a filter circuit, and a small amount of embedding resin was injected into the container for fixing the coil, and a lid was attached to the container. [0003] In the container, the connection between the coil and the external connection terminal is made by first crimping a connection fitting to the end of the winding of the coil, or a terminal capable of soldering the end of the winding to the external connection terminal in advance. Are fixed and screwed or soldered to the external connection terminals, respectively. [0004] A conventional noise filter using a toroidal coil by hand has difficulty in connecting a thick electric wire of the coil as it is by soldering or screwing. It is necessary to attach a connection fitting to the end, and the position and orientation of the end of the winding vary, so the coil wire is slightly bent at each end of the winding in the container using strong force. And the assembly time is long. [0005] In order to eliminate the drawbacks of the prior art, a coil and an external coil are connected in a box-shaped metal container using a choke coil employing a winding in which a rectangular electric wire is wound by an automatic device. The connection terminal is connected to a connection conductor obtained by bending a conductive plate. That is, the present invention is formed by winding a rectangular conductor vertically.
A choke coil using a pair of split windings using a spectacle-shaped winding , with both ends of an L-shaped conductive plate bent at right angles
With external connection terminals and insulation terminal board
Housed in a box-shaped metal container which is fitted through the glasses-shaped
And said terminal and the winding terminal, its both ends of the connecting conductors
These are large-current box-shaped noise filters connected to each other. The winding of a rectangular electric wire which is automatically wound into a tubular shape has the same position and direction at the end, and a through hole provided at the end enables connection by screwing. Both ends of the connection conductor face the ends of the winding and the external connection terminals in the metal container to facilitate connection by screwing. An embodiment of the present invention will be described in detail with reference to the drawings. (Embodiment 1) FIG. 1 is an exploded perspective view showing a first embodiment of the present invention without a cover. In the figure, a three-phase choke coil (hereinafter simply referred to as a coil) 1 sandwiches three of a pair of eyeglass-shaped windings 2 of a rectangular electric wire between four insulating partition plates 3 each having two through holes. The insulating cylinders 4 are inserted through two communicating holes, that is, concentrically arranged, the central holes of the split windings 21 and 22 of the glasses-shaped winding 2 and the through holes of the insulating partition plate 3, and two from the both sides of the insulating cylinder 4. The magnetic legs of the U-shaped core 5 of FIG. The coil 1 is mounted on an insulating base 7 which can be fixed to the inner bottom of the box-shaped metal container 6 and the insulating partition plate 3 is provided with an elongated recess 71.
, The lower part of the eyeglass-shaped winding 2 is inserted into the arcuate concave portion 72, the two core pressing members 8 are sandwiched between the step portions 73, and screwed to the wall surface of the step portion 73 to be fixed to the insulating base 7. And the core 5 is held in a closed magnetic circuit. The eyeglass-shaped winding 2 forms a first divided winding 21 (left side in the figure; winding direction is right-handed and proceeds to the left-hand side) by vertically turning a rectangular electric wire having a rectangular cross section, and successively adjoining each other. And a second divided winding 22 (right side in the figure, right-handed in the figure, and wound rightward) formed in the same winding direction. Both ends of the eyeglass-shaped winding 2 are on the same side in the axial direction, and are provided with small holes 9 extending to the same length outward in the tangential direction of the divided windings 21 and 22. In the figure, the small holes 9 have the same height as the axes of the split windings 21 and 22. The eyeglass-shaped winding 2 in which a rectangular electric wire is automatically wound vertically can improve the space factor from 70% to 90% as compared with the conventional case of lap winding of a thick electric wire, and downsize the coil. It has the feature that it can be used and the feature that the frequency characteristic is extended to a high band by reducing the stray capacitance. The box-shaped metal container 6 has a rectangular notch 61 formed on both side walls on the short side of the rectangular upper opening, and the insulating terminal plate 10 in which the external connection terminal 11 is integrally formed is fitted into the rectangular notch 61. It is. The end of the glasses-shaped winding 2 and the external connection terminal 11
Is formed by bending both ends of an L-shaped conductive plate placed at a right angle to form a small hole 13 near one end and a U-shaped notch 14 at the other end. In FIG. 1, only three of the six connecting conductors 12 are connected to the insulating base 7.
A rising piece having a U-shaped notch 14 protrudes outward from the insulating base 7 along the edge of the box-shaped metal container 6 and is attached to be parallel to the side wall of the box-shaped metal container 6. Outside the box-shaped metal container 6, the coil 1 is placed on the insulating base 7 to which the connecting conductor 12 is fixed, and the core press fitting 8
When fixed to the insulating base 7 at both ends, both ends of the glasses-shaped winding 2
It faces the rising piece having the small hole 13 of the connection conductor 12 and can be connected to the connection conductor 12 through the small holes 9 and 13 by screws. After fixing the insulating base 7 to which the coil 1 is fixed in the box-shaped metal container 6, the insulating terminal plate 10 is fitted into the square notch 61. Since the external connection terminal 11 passes through the U-shaped notch 14 of the connection conductor 12, it can be screwed and connected to the connection conductor 12. (Embodiment 2) Another embodiment of the present invention is shown in FIG. 2 without the container and the lid. The container (not shown) has an external connection terminal directly penetrating the side wall using an insulating bush. In the case of this container, a connection conductor 12 having a through-hole 15 provided in a rising piece on the other end side connected to a terminal is used. To assemble the noise filter, the connection conductors 12 are put in a container (not shown), the through holes 15 are fitted to the terminals in the arrangement shown in the drawing, and the terminals are screwed.
The coil 1 is fixed to the insulating base 16 having a smaller outer dimension than the insulating base 7 shown in FIG. Since the small holes 9 at both ends of the eyeglass-shaped winding 2 of the rectangular electric wire are opposed to the small holes 13 of the connection conductor 12, the winding 2 and the connection conductor 12 are connected to each other by screwing into the container. According to the present invention, by using a choke coil using a rectangular electric wire and a connection conductor obtained by bending a plate, an external connection terminal penetrated through the choke coil and the box-shaped metal container. The connection work with the filter is extremely easy, a noise filter can be efficiently assembled, and a small box noise filter for large current with good frequency characteristics can be provided at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing one embodiment of the present invention without a lid. FIG. 2 is an exploded perspective view of a main part showing another embodiment of the present invention. [Description of Signs] 1 Three-phase choke coil 2 Glasses-shaped winding 21, 22 Split winding 3 Insulating partition plate 4 Insulating cylinder 5 U-shaped core 6 Box-shaped metal container 61 Square notch 7, 16 Insulating base 71 Slender recess 72 arc-shaped concave portion 73 stepped portion 8 core retainer 9, 13 small hole 10 insulating terminal plate 11 external connection terminal 12 connection conductor 14 U-shaped notch 15 through hole

Claims (1)

(57) [Claims 1] Two flat wires formed by winding a rectangular conductor vertically.
A connecting conductor in which both ends of an L-shaped conductive plate are bent at right angles to a choke coil using a glasses-shaped winding made of split windings
With the external connection terminal or through the insulating terminal plate.
Housed in a box-shaped metal container fitted Te, of the glasses-shaped winding
Terminal and the terminal and a high-current box-noise filter formed by respectively <br/> connected to both ends of the connecting conductors.