JP3886816B2 - Current detector for compressor motor in air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to current detection apparatus for a motor for a compressor in an air conditioner.
[0002]
[Prior art]
Conventionally, a control device for an air conditioner is provided with a current transformer that detects a current flowing through a motor that drives a compressor. In this current transformer, the current flowing through the motor is detected by the current flowing through the primary winding. The microcomputer controls one or more of the rotational speed of the motor, the opening degree of the expansion valve, the rotational speed of the indoor fan, and the rotational speed of the outdoor fan based on the output of the current transformer, and It prevents the overcurrent from flowing through the motor.
[0003]
Conventionally, the current transformer is used by being mounted on a printed circuit board. In that case, the terminal portions for the current transformer and the like are located away from the printed circuit board on which the current transformer is mounted, and are connected to each other by wiring (harness).
[0004]
[Problems to be solved by the invention]
However, the conventional air conditioner current detection device has the following problems. That is, a current transformer for detecting the current of the compressor motor is mounted on the printed circuit board, and is connected to the terminal portion by wiring (harness). Therefore, when the mounting position of the current transformer is very far from the terminal portion, the length of the wiring or harness becomes long and the wiring becomes complicated. There is also a problem that the current detection device including the current transformer and the terminal portion mounted on the printed circuit board becomes large.
[0005]
Furthermore, since the current flowing through the primary winding of the current transformer needs to flow through the copper foil on the printed circuit board, when detecting the current of the compressor motor through which a large current of about 60 amperes flows, the copper There is also a problem that it is necessary to increase the area of the foil, and the size of the printed circuit board increases.
[0006]
Accordingly, an object of the present invention is to provide a current detection device for a compressor motor in a compact air conditioner that does not require wiring.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a current detection device for a compressor motor in an air conditioner of the present invention comprises:
A conductive plate that forms an electric circuit; a resin substrate body that includes the conductive plate; a resin molded circuit substrate that has a plurality of insulating walls that are erected from the surface of the resin substrate body and that have a predetermined distance from each other;
Rutotomoni disposed between opposing the insulating wall from one another, whereas on the side connected to the power supply, the other side provided with one or more terminal plates of the motor compressor are connected,
At least one of the terminal plates includes a first terminal plate portion and a second terminal plate portion that are mechanically and electrically separated from each other, and includes the first terminal plate portion and the second terminal plate portion. A current detecting transformer electrically connected to the first terminal plate portion and the second terminal plate portion is disposed between
Insulating walls are formed that stand from the surface of the resin substrate body and are arranged between the first terminal plate portion and the transformer and between the second terminal plate portion and the transformer. It is characterized by that.
[0008]
According to the above configuration , one side is connected to the power source and the other side is connected between the insulating walls on the resin molded circuit board having a plurality of insulating walls on the surface of the resin substrate main body including the conductive plate. One or a plurality of terminal plates to which a compressor motor is connected are disposed, and the resin molded circuit board and the terminal portion are integrally formed. At least one terminal plate is composed of a first terminal plate portion and a second terminal plate portion that are mechanically and electrically separated from each other, and a current detection transformer is disposed between the first terminal plate portion and the second terminal plate portion. It is connected. This eliminates the need for wiring (harness) for connecting the transformer and the terminal plate, and reduces the size of the current detection device including the transformer and the terminal portion.
[0009]
In one embodiment, in the current detection device for a compressor motor in the air conditioner of the present invention, each part of the first terminal plate portion and the second terminal plate portion is embedded in the resin substrate body. At the same time, it is a cylindrical portion that is located below and rises upward from the transformer, and a terminal of the transformer is inserted into and electrically connected to the cylindrical portion.
[0010]
According to this embodiment, a part of the first terminal plate portion and the second terminal plate portion are embedded in the resin substrate main body and form a cylindrical portion standing upward. Accordingly, a recess is formed at the junction between the tubular portion and the transformer terminal on the back surface of the first terminal plate portion and the second terminal plate portion, and solder for connecting the tubular portion and the terminal is formed. The amount increases. Therefore, the connection of the transformer to the first terminal plate portion and the second terminal plate portion is firmly performed.
[0011]
In one embodiment, in the current detection device for a compressor motor in the air conditioner of the present invention, a rib is provided on the surface of the resin substrate body in the resin molded circuit substrate.
[0012]
According to this embodiment, the rib is provided on the resin molded circuit board. Accordingly, warping and bending of the resin molded circuit board are prevented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a configuration diagram of a current detection device for an air conditioner according to the present embodiment. 1A is a plan view, and FIG. 1B is a side view seen from the direction of arrow B in FIG. 1A.
[0014]
A motor terminal block 2 for driving the compressor is provided on the resin molded circuit board 1. The resin molded circuit board 1 has an electronic component (not shown) mounted thereon, and the surface of a conductive plate (not shown) that forms an electric circuit is covered with an insulating resin (resin board body) by resin molding. It is a plate.
[0015]
In the present embodiment, in order to enable detection of a large current of about 60 amperes flowing through the compressor motor, the resin molding is not performed on the printed circuit board which is not suitable for detecting a large current as described above. It is assumed that a current detection device is provided on the circuit board 1.
[0016]
The terminal block 2 has three terminal plates 3, 4, and 5 corresponding to the R phase, S phase, and T phase of the three-phase wiring for the motor attached and fixed to the resin molded circuit board 1, respectively. In addition, each of the terminal plates 3, 4 and 5 is structurally and electrically separated by insulating walls 7a, 7b, 7c and 7d which are erected substantially vertically on the surface of the resin substrate main body. Yes. The terminal plate 5 corresponding to the T phase is composed of a first terminal plate portion 5a and a second terminal plate portion 5b, and one side of each of the terminal plates 3 and 4 and the first terminal plate portion 5a have 3 Terminals (not shown) connected to the phase power supply are connected by screws 8a, 8b, 8c. On the other hand, on the other side of each terminal plate 3, 4 and the second terminal plate portion 5b, terminals (not shown) connected to the motor (not shown) for the compressor are screws 9a, 9b, 9c. Connected.
[0017]
Further, in the present embodiment, a current transformer 10 for detecting a current flowing through the motor is installed between the first terminal plate portion 5a and the second terminal plate portion 5b. The first terminal plate portion 5a and the second terminal plate portion 5b are connected. Thus, since the current transformer 10 is installed on the terminal board 5 and is directly electrically connected to the terminal board 5, wiring (harness) for connecting the current transformer 10 and the terminal board 5 is not necessary. In addition, the current detection device including the current transformer 10 and the terminal block 2 can be reduced in size. Further, the primary winding of the current transformer 10 is connected to a first terminal plate portion 5a formed of a metal plate that is thicker than the copper foil of the printed board. Therefore, the current / connection terminal area flowing through the primary winding can be increased, and a large current of about 60 amperes necessary for the motor can be passed. As a result, the problem that the size of the printed circuit board increases due to the installation of the current detection device can be solved.
[0018]
Furthermore, on the resin substrate main body of the resin molded circuit board 1 provided with the terminal block 2 in the present embodiment, plate-like ribs 11 and 12 extending in the vertical direction are provided at the end of the resin molded circuit board 1. The terminal block 2 is connected to the other terminal block 13 at both ends in parallel to the edge. By doing so, it is possible to prevent the resin molded circuit board 1 from warping or bending due to the weight of the terminal block 2 or the like.
[0019]
FIG. 2 is a cross-sectional view taken along line AA ′ in FIG. In FIG. 2, one end portion 15 of the first terminal board portion 5 a passes through a hole provided in the resin molded circuit board 1 and is fixedly attached to the metal conductive plate 16 of the resin molded circuit board 1 with solder 17. ing. On the other hand, the other end portion 18 of the first terminal board portion 5 a is embedded in the resin substrate body of the resin molded circuit board 1 and is positioned below the current transformer 10. And as shown by the broken-line circle C, it has the cylindrical part 19 which stood upwards, and what is called a burring process is given. Then, the rod-shaped connection terminal 20 of the current transformer 10 is inserted into the cylindrical portion 19, and the cylindrical portion 19 and the connection terminal 20 are connected and fixed from the back surface side of the resin molded circuit board 1 by the solder 21. . Although not described in detail, the burring process is also applied to the second terminal plate portion 5b in connection with the second terminal plate portion 5b and the other connection terminal of the current transformer 10 as in the case of the first terminal plate portion 5a. Is performed.
[0020]
In this manner, by performing burring processing for forming the cylindrical portion 19 standing upward on the end portion 18 embedded in the resin substrate body of the first terminal plate portion 5a and the second terminal plate portion 5b, Since the concave portion is formed in the portion where the solder 21 is formed, the amount of the solder 21 is increased, and the connection of the current transformer 10 to the first terminal plate portion 5a and the second terminal plate portion 5b can be strengthened. . At that time, the end 18 of the first terminal plate 5a and the end of the second terminal plate 5b are embedded in the resin substrate main body, and the upper end of the cylindrical portion 19 is the same as the upper surface of the resin substrate main body. It is height. Therefore, the connection terminal 20 can be easily inserted into the cylindrical portion 19 as compared with the case where the upper end of the cylindrical portion 19 is lower than the upper surface of the resin substrate body. Reference numeral 22 denotes a hole in which a female screw into which a screw 8c provided in the first terminal plate portion 5a is screwed is provided.
[0021]
As described above, in the present embodiment, the terminal block 2 for the motor that drives the compressor is provided on the resin molded circuit board 1, and the space between the terminal plates 3, 4, 5 is the surface of the resin molded circuit board 1. They are electrically separated by insulating walls 7a, 7b, 7c, 7d provided perpendicularly to each other. The terminal 5 corresponding to the T phase is composed of a first terminal plate portion 5a and a second terminal plate portion 5b, and a current transformer 10 for detecting a current flowing through the motor is installed between the first terminal plate portion 5a and the second terminal plate portion 5b. It is connected to the 1 terminal board part 5a and the 2nd terminal board part 5b. Accordingly, the wiring (harness) for connecting the current transformer 10 and the terminal 5 is not necessary, and the current detection device can be made compact. Further, since the primary winding of the current transformer 10 is connected to the first terminal plate portion 5a formed of a thick metal plate, it is possible to flow a large current of about 60 amperes necessary for the motor. Become.
[0022]
At that time, the connection between the first terminal plate portion 5a and the second terminal plate portion 5b with the connection terminal 20 of the current transformer 10 is made by resin molding the end portions of the first terminal plate portion 5a and the second terminal plate portion 5b. This is done by inserting the connection terminal 20 of the current transformer 10 into the cylindrical part 19 which is embedded in the resin substrate body of the circuit board 1 and stands up and is connected by solder 21 from the back surface. Accordingly, since the concave portion is formed in the portion where the solder 21 is formed on the back surfaces of the first terminal plate portion 5a and the second terminal plate portion 5b, the amount of the solder 21 increases, and the first terminal plate portion 5a of the current transformer 10 and The connection to the 2nd terminal board part 5b can be strengthened. Furthermore, ribs 11 and 12 are provided on the resin-molded circuit board 1 so as to be parallel to the edge and to connect the terminal block 2 and the other terminal block 13. Therefore, warping and bending of the resin molded circuit board 1 can be prevented.
[0023]
In the above embodiment, burring is performed on the resin molded circuit board 1 provided with the terminal block 2. However, the burring process is not limited to the terminal portion for the compressor motor of the resin-molded circuit board 1, but a normal circuit in which other terminal portions of the resin-molded circuit board 1 and a conductive plate are formed on the surface of the resin board. There is no problem even if it is provided on the substrate. Moreover, although the case where it applied to the wiring of 3 phases was demonstrated to the example in the said embodiment, it is not restricted to 3 phases, You may be a single phase or it may be 2 phases. Furthermore, although the current transformer 10 is provided between the first terminal plate portion 5a and the second terminal plate portion 5b of the terminal plate 5 for one phase, the first second terminal plate portion of the terminal plate for a plurality of phases. A current transformer 10 may be provided between them.
[0024]
【The invention's effect】
As is clear from the above, the current detection device for the compressor motor in the air conditioner according to the present invention includes a resin substrate body including a conductive plate inside and a resin molded circuit board having a plurality of insulating walls. In the meantime, one or a plurality of terminals connected to a power source on one side and a motor for a compressor on the other side are provided, and at least one terminal plate is connected to the first terminal plate portion and the second terminal plate portion. Since a current detection transformer is disposed between the first terminal plate portion and the second terminal plate portion and electrically connected to the first and second terminal plate portions, the transformer and the terminal Wiring (harness) to connect the board is not necessary. Furthermore, the current detection device including the transformer and the terminal portion can be made compact.
[0025]
In addition, the current detection device for the compressor motor in the air conditioner of one embodiment embeds each part of the first terminal plate portion and the second terminal plate portion in the resin substrate body, and Since a cylindrical portion is formed by standing upward at the bottom, and the terminals of the transformer are inserted into and electrically connected to the cylindrical portion, solder on the back surfaces of the first terminal plate portion and the second terminal plate portion The amount of the solder can be increased by forming a recess in the portion where the solder is formed. Accordingly, the connection of the transformer to the first terminal plate portion and the second terminal plate portion can be strengthened.
[0026]
In addition, the current detection device for the compressor motor in the air conditioner of one embodiment is provided with a rib on the surface of the resin substrate main body of the resin molded circuit board, so that the resin molded circuit board is prevented from being warped or bent. be able to.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a current detection device for a compressor motor in an air conditioner of the present invention.
FIG. 2 is a cross-sectional view taken along line AA ′ in FIG.
[Explanation of symbols]
1 ... resin molded circuit board,
2,13 ... terminal block,
3, 4 ... Terminal board,
5a ... 1st terminal board part,
5b ... 2nd terminal board part,
7a, 7b, 7c, 7d ... insulating walls,
8a, 8b, 8c, 9a, 9b, 9c ... screw,
10 ... Current transformer,
11, 12 ... ribs,
16 ... conductive plate,
17, 21 ... Solder,
19 ... Cylindrical part,
20: Current transformer connection terminal.

Claims (3)

A conductive plate (16) forming an electric circuit, a resin substrate main body including the conductive plate (16) inside, and a plurality of insulating walls (7a, 7a, 7b, 7c, 7d) a resin molded circuit board (1);
The insulating walls facing each other (7a, 7b, 7c, 7d ) is arranged between the Rutotomoni, whereas on the side connected to the power supply, one or a plurality of terminal plates for a motor compressor is connected to the other side With (3,4,5)
At least one of the terminal plates (3, 4, 5) includes a first terminal plate portion (5a) and a second terminal plate portion (5b) which are mechanically and electrically separated from each other, and Current detection electrically connected to the first terminal plate portion (5a) and the second terminal plate portion (5b) between the first terminal plate portion (5a) and the second terminal plate portion (5b). place a transformer (10) for use,
With rising from the surface of the resin substrate body, between said first terminal plate (5 a) and between said second terminal plate portions of the transformer (10) (5 b) and the transformer (10) An electric current detection device for a motor for a compressor in an air conditioner, characterized in that an insulating wall is formed in the air conditioner. In the electric current detection apparatus of the motor for compressors in the air conditioner according to claim 1,
A part of each of the first terminal plate portion (5a) and the second terminal plate portion (5b) is embedded in the resin substrate main body, and is positioned below the transformer (10) and standing upward. A motor for a compressor in an air conditioner, characterized in that a terminal (20) of the transformer (10) is inserted into and electrically connected to the cylindrical part (19). Current detection device. In the electric current detection apparatus of the motor for compressors in the air conditioner of Claim 1 or Claim 2,
A current detection device for a motor for a compressor in an air conditioner, wherein ribs (11, 12) are provided on a surface of a resin substrate body in the resin molded circuit board (1).

Images