JP3723684B2 - Large current noise filter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a large current noise filter such as a line filter.
[0002]
[Prior art]
In this type of noise filter, as disclosed in, for example, Japanese Patent Laid-Open No. 7-45457, an insulating base is provided on the inner bottom of a metal case, and a coil assembly including a coil core and a bobbin is set on the insulating base. The coil assembly is fixed by a fixing bracket, and the relay terminal provided on the insulating base is connected to the terminals at both ends of the metal case, and the coil end and the relay terminal are connected. Yes.
[0003]
[Problems to be solved by the invention]
As described above, the conventional noise filter requires an insulating base and a fixing bracket having a relay terminal in order to fix the coil assembly to the metal case, so the number of parts is large, and the number of assembly steps is large. There is a problem of high costs. Moreover, since there are many connection locations, there exists a problem that electrical reliability becomes low.
[0004]
In view of the above problems, the present invention provides a high-current noise filter that has a reduced number of parts and assembly steps, can be realized with a simple structure, can reduce costs, and has improved electrical reliability. Objective.
[0005]
[Means for Solving the Problems]
The noise filter for large current of claim 1 is a noise filter for large current of 20A to 300A,
A coil assembly in which a plurality of coils formed by providing terminal holes for external connection at both ends are assembled to a core, a case composed of upper and lower cases for housing the coil assembly, and a pair of terminal blocks ,
The terminal block has a partition between locations corresponding to the ends of the coils protruding from both ends of the coil assembly, and a through-hole-shaped slit that guides the ends of the coils between the partitions. And, a nut is fixed to a location corresponding to the end of each coil, the coil is a flat wire, and a twist portion is provided between the coil both ends and the coil winding portion, thereby Forming a terminal part in which the plate surface is vertically oriented,
A terminal for connecting a capacitor or a resistor provided in the case is connected to the terminal portion ,
Assembling the terminal block to the coil assembly by inserting the end of the coil into the slit and overlapping the end of each coil on the nut,
The terminal blocks are fitted to the left and right inner edges of the cuts provided in the opening edges of the lower case with grooves provided at both ends thereof, and the terminal blocks are fixed to the lower case,
The end of the coil was connected to the external lead by inserting a screw for connection through the terminal hole of the terminal of the external lead wire and the terminal hole of the end of the coil and screwing into the nut. It is characterized by that.
[0006]
Thereby, since the coil end is also used as a terminal, the number of parts and man-hours can be reduced, the cost can be reduced, and the number of connection points can be reduced, so that the electrical reliability is increased.
[0007]
The noise filter for large current according to claim 2 is characterized in that the width of the terminal hole forming portion at both ends of the coil is wider than the width of the coil.
[0008]
In this way, by expanding the coil end, it is possible to use a larger-sized screw as a lead connection screw of the terminal portion, and to use a small-diameter or narrow-width wire as the wire constituting the coil. In addition, a small and large current noise filter with a small coil diameter can be configured.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1 is an exploded perspective view showing an embodiment of a noise filter for large current according to the present invention, FIG. 2A is a perspective view showing an assembled state thereof, and FIG. 2B is a cross-sectional view showing a terminal portion thereof. 2C is a plan view of the coil end, and FIG. 3A is a circuit diagram of the noise filter.
[0012]
1 and 2, reference numeral 1 denotes a metal case. The metal case 1 is integrally formed by connecting a lower case 3 and an upper case 2 (see FIG. 2B) with screws (not shown). Combined. The left and right grooves on both ends of the pair of synthetic resin terminal blocks 5 and 6 are fitted into the left and right inner edges of the notch 3a provided at the opening edges at both ends of the lower case 3 so that these terminal blocks 5 and 6 are mounted on the lower case. Fix to 3.
[0013]
11 and 12 are coils made of rectangular wires, each wound around a bobbin 15 to which a core 13 composed of a combination of U-shaped cores or a combination of a U-shaped core and an I-shaped core is assembled. An insulating plate 17 is interposed between the coils 11 and 12 to constitute the coil assembly 7. Each of the coils 11 and 12 is formed in an eyeglass shape, and the bobbin 15 is constituted by a combination of H-shaped divided bobbins.
[0014]
Both ends of the coils 11 and 12 are formed as terminal portions 11a, 11b, 12a and 12b by peeling off the insulation coating and solder plating, and each terminal portion 11a, 11b, 12a and 12b has a terminal hole 9 respectively. And a twisted portion between each of the terminal portions 11a, 11b, 12a, 12b and the coil winding portion so that these terminal portions 11a, 11b, 12a, 12b are vertically oriented and function as terminal portions. 10 is provided. As shown in FIG. 2C, the terminal portions 11a, 11b, 12a, and 12b are formed wider than the widths of the coils 11 and 12 by press molding.
[0015]
A screw hole 16 is provided on the lower surface of the flange portion 15a of the bobbin 15, and the coil assembly 7 is fixed to the case 1 by screwing a screw 19 passed through the hole 18 provided in the bottom plate of the case 1 into the screw hole 16. are doing. In the coil assembly 7, the upper case 2 may also be screwed to the flange portion 15a.
[0016]
As shown in FIG. 2B, each of the terminal blocks 5 and 6 has through-hole shaped slits 21 and 22 through which the terminal portions 11a, 11b, 12a and 12b of the coils 11 and 12 are inserted, and FIG. As shown in FIGS. 2A and 2B, the portions corresponding to the terminal portions 11a, 11b, 12a, and 12b are partitioned by partitions, and nuts 23 are provided at the portions corresponding to the end portions of the respective coils. Is fixed. 2B, the terminal portions 11a, 11b, 12a and 12b of the coils 11 and 12 are inserted into the slits 21 and 22 provided in the terminal blocks 5 and 6 and overlapped with the nut 23. Thus, the terminal blocks 5 and 6 are assembled to the coil assembly 7. Then, the terminal blocks 5 and 6 are fitted into the notches 3a of the lower case 3, and the connection screws 25 are connected to the terminal holes 24a of the terminals of the external lead wires 24 and the terminal holes 9 of the terminal portions 11a, 11b, 12a and 12b. The external lead wire 24 is connected to each of the terminal portions 11a, 11b, 12a, and 12b by being inserted into the nut 23 and screwed into the nut 23.
[0017]
As shown in FIG. 3A, an X capacitor Cx and a Y capacitor Cy are attached between the terminal portions 11a and 12a, and an X capacitor Cx is provided between the terminal portions 11b and 12b. L1 and L2 are constituted by coils 11 and 12 and a core 13, respectively. In addition, a resistor R is provided between the terminal portions 11b and 12b as necessary in order to remove the counter electromotive force generated in the inductors L1 and L2 and the discharge of the capacitors Cx and Cy and noise when the power is turned off. As shown in FIG. 2B, terminals 26 for connecting the capacitors Cx, Cy or resistor R provided in the case 1 are welded to the terminal portions 11a, 11b, 12a, 12b. In FIGS. 1 and 2A, the capacitors Cx and Cy or the resistor R are not shown.
[0018]
Since the coils 11 and 12 can be used with a large current (20A to 300A) and are small in size, a rectangular wire is used in the present embodiment, and the wire in the radial direction of the coil has a wire width in the core direction. Although formed and wound so as to be larger than the width, as shown in FIG. 3 (B), the present invention uses another wire rod 30 such as a circular cross section and has an end portion 30a having a terminal hole 30b. May be formed in a flat plate shape.
[0019]
In this way, by configuring the ends of the coils 11 and 12 as terminal portions, terminals as separate components are not required, so that the number of components and man-hours can be reduced, and costs can be reduced. Since the number of locations is reduced, electrical reliability is increased. Further, by expanding the coil end portion, it is possible to use a lead connecting screw 25 of the terminal portion that can flow a large current of a larger size. On the other hand, as the wire material for the coils 11 and 12, a wire material having a small diameter or a narrow width. Can be used, and a small-sized and large-current noise filter can be configured. In addition, by providing the twisted portion 10 between the terminal portions 11a, 11b, 12a, 12b at both ends of the coil and the coil winding portion, the plate surfaces at both ends of the coil are formed so as to face up and down. A terminal surface having an area can be easily obtained. In addition, since the terminal surface faces vertically, the external connection terminal can be easily attached.
[0020]
The present invention can also be configured for three phases. Further, one end of the coil may be configured such that the terminal portions 11 a and 11 b are set on the same side of the case 1 and the terminal portions 12 a and 12 b are set on the other side of the case 1. Further, the bobbin may be configured to have one cylindrical part instead of two cylindrical parts. Further, the bobbin 15 may be eliminated by interposing, for example, a sheet-like insulator between the coils 11 and 12 and the core 13.
[0021]
【The invention's effect】
According to the first aspect of the present invention, there is provided a 20A to 300A high-current noise filter, in which a plurality of coils formed by providing external connection terminal holes at both ends are assembled to a core, and the coil A case composed of upper and lower cases for housing the assembly and a pair of terminal blocks, the terminal blocks having partitions between locations corresponding to the ends of the coils projecting at both ends of the coil assembly; , Having a through-hole shaped slit for guiding the end of each coil between the partitions, and fixing a nut at a location corresponding to the end of each coil, the coil being a rectangular wire, By providing a twisted portion between the coil winding portion and the coil winding portion, a terminal portion having a shape in which the plate surfaces of both end portions of the coil are vertically oriented is formed, and the terminal portion is provided with a capacitor provided in the case Or connect resistor It connects the order of terminal, assembling the terminal block to the coil assembly by overlapping the ends of the respective coils to the nut while inserting the end portion of the coil to the slit, respective terminal The terminal is fixed to the lower case by fitting grooves provided at both ends thereof to the left and right inner edges of the notch provided at the opening edge of the lower case, and a screw for connection is connected to the terminal of the external lead wire. Since the end of the coil is connected to the external lead wire by being inserted into the terminal hole and the terminal hole of the end of the coil and screwed into the nut, the coil end is also used as a terminal, Reduction in the number of parts and man-hours can be achieved, thereby reducing costs. Moreover, since the number of connection locations is reduced, electrical reliability is increased. In addition, since the coil is a rectangular wire, a small and high-current noise filter can be easily configured, and by providing a twisted part between the coil both ends and the coil winding part, Since the plate surface is formed so as to face up and down, a terminal surface with a wide contact area can be easily obtained. Moreover, since the terminal surface faces vertically, it is easy to mount the terminal.
[0022]
According to claim 2, since the width of the portion where the terminal hole is formed at both ends of the coil is wider than the width of the coil, it is possible to use a larger size screw as the lead connection screw of the terminal portion. Since the current is not limited in the terminal portion, and a small-diameter or narrow-width wire can be used, a small and large-current noise filter with a small coil diameter can be configured.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of a noise filter according to the present invention.
2A is an exploded perspective view of the coil assembly of FIG. 1, FIG. 2B is a cross-sectional view showing a terminal portion thereof, and FIG. 2C is a plan view of an end portion of the coil.
3A is a circuit diagram of a noise filter according to the present embodiment, and FIG. 3B is a plan view showing another example of a wire constituting a coil.
[Explanation of symbols]
1: Case, 3: Lower case, 5, 6: Terminal block, 7: Coil assembly, 9: Terminal hole, 10: Twist part, 11, 12: Coil part, 11a, 11b, 12a, 12b: Terminal part, 13: Core, 15: Bobbin, 16: Screw hole, 17: Insulating plate, 23: Nut, 24: External lead wire, 25: Screw

Claims (2)

20A to 300A large current noise filter,
A coil assembly in which a plurality of coils formed by providing terminal holes for external connection at both ends are assembled to a core, a case composed of upper and lower cases for housing the coil assembly, and a pair of terminal blocks ,
The terminal block has a partition between locations corresponding to the ends of the coils projecting on both sides of the coil assembly, and has a through-hole-shaped slit that guides the end of each coil between the partitions. And fixing a nut to a location corresponding to the end of each coil,
The coil is a flat wire, and by providing a twisted part between the coil both ends and the coil winding part, a terminal part is formed in which the plate surfaces of both ends of the coil are vertically oriented,
A terminal for connecting a capacitor or a resistor provided in the case is connected to the terminal portion ,
Assembling the terminal block to the coil assembly by inserting the end of the coil into the slit and overlapping the end of each coil on the nut,
The terminal blocks are fitted to the left and right inner edges of the cuts provided in the opening edges of the lower case with grooves provided at both ends thereof, and the terminal blocks are fixed to the lower case,
The end of the coil was connected to the external lead by inserting a screw for connection through the terminal hole of the terminal of the external lead wire and the terminal hole of the end of the coil and screwing into the nut. This is a noise filter for large currents. In claim 1,
A noise filter for large current, wherein the width of the terminal hole forming portion at both ends of the coil is wider than the width of the coil.

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