JPH03218694A - Control device housing case - Google Patents

Abstract

PURPOSE:To enable a shielding plate and a heat dissipating film to be formed into an integral structure so as to facilitate the assembly of a control device housing case. CONSTITUTION:An aluminum formed piece is used as a shielding plate 12 provided inside a metal case 11, and a heat dissipating fin is so formed on the inner face of a part of the shielding plate 12 which constitutes an air duct so as to enable the heat dissipating surface of a power element 18 to be fixed to the inner face concerned. Therefore, the shielding plate 12 and the heat dissipating fin are formed in one piece, so that components are lessened in number. Moreover, all the shielding plate 12 serves as a radiator, the radiator is remarkably increased in surface area and heat dissipating effect, so that the power element 18 can be increased in heat release value and in result a control device can be enhanced in output power without enlarging the device in outside dimension. By this setup, an assembly operation can be decreased in man-hours.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a storage box for a control device that drives an electric motor based on an external command.

Conventional technology In recent years, motor control devices have been used in industrial equipment to easily control the rotational speed, etc. of electric motors, which drive the motors according to external commands such as rotational speed. Various methods have been devised to store such items in storage boxes.

A storage box for a conventional control device will be explained below. Second
The figure shows the internal structure of a conventional motor drive device. In Fig. 2, reference numeral 1 indicates an open metal case forming a housing, and reference numeral 2 is located in the middle of the metal case 1 and is fixed, with the end bent into a step shape, and a ventilation channel formed between the inner wall of the metal case 1 and the inner wall of the metal case 1. A control board 3 is fixed to the surface of the shielding board 2 via a support 6 and sends a signal to the power element 8 on the power board 4 in response to an external command.
5 is a power board that is fixed to the back surface of the shielding plate 2 via a support 7 and supplies power to the electric motor, and 5 is a control board 3 and a power board F.
9 is a three-terminal regulator that supplies control power to the control board and the power board; 10 is a flat cable that connects signals to and from i4; This is an electric fan that generates wind in the direction shown in the figure. The three-terminal regulator 9 and the power element 4 on the power board 4 are located within the ventilation path formed by the shielding plate 2.

In the control device storage box configured as described above, the control board 3 and the power board 4 are fixed to both sides of the shielding plate 2 via supports 6 and 7, respectively, and the shielding board 2 is fixed to the power board 4. This shields electromagnetic noise generated on the control board 3 and prevents the elements on the control board 3 from malfunctioning. Further, by fixing the control board 3 and the power board 4 to the shielding plate 2 and connecting signals between the control board 3 and the power board 40 using the flat cable 5, wiring of the motor drive device is completed in one piece.

Furthermore, excluding the power element 8 and the three-terminal regulator 9
All the elements are mounted on the surfaces of the control board 3 and power board 4 that do not face the shielding plate 12, so fine adjustments to the elements on the control board 3 and power board 4 and confirmation of circuit operation are made in this state. be able to. Furthermore, by arranging the power element 8 and the three-terminal regulator 9 in the ventilation path of the electric fan 10 formed by the shielding plate 2 on the power base 4, the cooling effect of the power element 8 and the three-terminal regulator 9 can be improved. It's increasing. Note that the means for fixing the control board and power board to the shielding plate is to provide a cut-and-raised part in the shielding plate, and to machine holes or screws in this part, or to use a hole for fixing the support. Or, the insulation space is secured by threading.

As described above, the conventional control device storage box is fixed inside the metal case so as to separate the control board and the power board, and forms a ventilation path for the electric fan fixed inside the metal case. Holes for fixing the pillars that fix the control board and power board, and a shielding plate with female screws to shield electromagnetic noise generated on the control board and prevent elements on the control board from malfunctioning. I'm here.

In addition, by arranging the power element and three-terminal regulator in the ventilation path of the electric fan, the respective heat sinks can be eliminated, and furthermore, the operation of the elements on the power board and control board can be finely adjusted and confirmed at the same time. I can do it.

Problems to be Solved by the Invention However, in the conventional configuration described above, heat dissipation from the power element is performed only by an electric fan. Even if a radiator is installed and the power element is cooled by both the electric fan and the radiator, the radiator attached to the power element cannot be made very large if the external dimensions of the control device are fixed, so it is necessary to suppress the heat generation of the power element. Therefore, the output of the control device cannot be increased very much, and the number of man-hours increases by incorporating a heat radiator.

The present invention solves the above-mentioned conventional problems, and can increase the heat dissipation effect of the power element without increasing the external dimensions of the control device. Also, since the number of parts does not increase, the number of assembly steps increases. The purpose of the present invention is to provide a storage box for a control device that does not need to be used.

Means for Solving the Problems In order to achieve this object, the storage box for a control device of the present invention is constructed by arranging an aluminum plate bent into a step shape in the middle of the case. A space serving as a ventilation path is formed inside the space, and an electric fan is arranged in a part of this space, a power board is arranged on the side of the steel plate on the side of the ventilation path, and a control board is arranged on the opposite side. A heat dissipation fin is formed on the inner surface of the portion forming the ventilation path, and the aluminum plate is shaped so that the heat dissipation surface of the power element can be fixed to the above-mentioned surface.

Effect: With this configuration, the surface area of the heatsink that dissipates the heat generated by the power element is dramatically increased, and the output of the control device can be dramatically increased without increasing the external dimensions of the control device. Since there is no need to add additional equipment, the number of parts and man-hours can be reduced, leading to cost reductions.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a storage box for a control device in an embodiment of the present invention. In FIG. 1, reference numeral 11 is an open metal case that forms a housing, 12 is located in the middle of the metal case 11 and is fixed, the end is bent into a step shape, and the inner wall of the metal case 11 is fixed. This is a closed plate made of aluminum that forms a ventilation path between the radiator and the radiator fin, and heat dissipation fins are formed on the inner surface of the portion that forms the ventilation path. 13
is fixed to the surface of the shielding plate 12 via a support 16, and receives a command from the outside to activate the power element 18 on the power board 14.
14 is a power board that is fixed to the back of the shielding plate 12 via a support 17 and supplies power to the electric motor; 15 is a flat board that connects signals between the control board 13 and the power board 14; The cable 20 is an electric fan that generates air in the direction shown along the ventilation path, which is disposed at one end of the space forming the ventilation path. The three-terminal regulator and power element l8 on the power board 14 are connected to the shielding plate 12.
It is located and disposed within the ventilation path formed by.

The screws 19 fix the power element 18 so that the heat radiation surface of the power element 18 is in contact with the inner surface of the ventilation path of the shielding plate 12.

In the storage box for the control device configured as described above, the control board 13 and the power board 14 are fixed to both sides of the shielding plate 12 via supports 16 and 17, respectively, and the shielding plate 12 is connected to the power board This shields electromagnetic noise generated on the control board 14 and prevents the elements on the control board 13 from malfunctioning. Further, by fixing the control board 13 and the power board 14 to the shielding plate 12 and connecting signals between the control board 13 and the power board 14 using the flat cable 15, wiring of the motor drive device is completed in one piece. Furthermore, the power element 18
All elements except the three-terminal regulator are on the control board 1.
3 and the power board 14 are each mounted on a surface that does not face the shielding plate 12, so it is possible to perform one-time adjustments of the elements on the control board 13 and the power board 14 and check the circuit operation in this state. .

Furthermore, the power element 18 is arranged in the ventilation path of the electric fan 20 formed by the shielding plate 12 on the power board 14, and a heat dissipation fin formed on a part of the power element 18 and the shielding plate 12. The cooling effect is enhanced. Furthermore, since the entire shielding plate 14 is formed of an aluminum body, the surface area is large and the heat dissipation effect is large.

The means for fixing the control board and the power board to the shielding plate is to provide a protrusion on the shielding plate and drill a hole or screw in this part, or to use a hole or screw for fixing the support. Processed to ensure insulation space.

As described above, according to this embodiment, an aluminum molded product is used as the shielding plate disposed inside the metal case, and heat dissipation fins are provided on the inner surface of the part of the shielding plate that forms the ventilation path. By molding it and molding it so that the heat radiation surface of the power element can be fixed to this surface, the shielding plate and the heat radiation fin are integrated, which reduces the number of parts. Furthermore, the entire shielding plate becomes a heat sink, dramatically increasing the surface area of the heat sink and increasing the heat radiation effect, making it possible to increase the amount of heat generated by the power element without increasing the external dimensions of the control device. , the output of the control device can be dramatically increased.

Effects of the Invention As described above, the present invention separates a control board and a power board inside a metal case, and uses an aluminum molded product for a shielding plate that forms a ventilation path for an electric fan inside the metal case.
By molding the radiation fins on the inner surface of the portion of the shielding plate that forms the ventilation path, and by forming the heat radiation surface of the power element on this surface so that it can be fixed, the shielding plate and the radiation fins are integrated. Since the number of parts is reduced, assembly man-hours are reduced and costs are reduced. In addition, the entire shielding plate becomes a heat radiator, dramatically increasing the heat dissipation effect.The heat output of the power element can be increased, and the output of the control device can be dramatically increased without increasing the external dimensions of the control device. This improves the performance of the control device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the internal structure of a control device storage box in an embodiment of the present invention, and FIG. 2 is a diagram showing the internal structure of a storage box of a conventional control device. 11... Metal case, 12... Shielding plate, 13... Control board, 14... Power board, 15... Flat cable , 16.17
..... Support column, 18 ..... Power element, 19
...Screw, 2o...Electric fan.

Claims (3)

[Claims] (1) A step-shaped bent aluminum plate is placed in the middle of the housing to form a space inside the housing that serves as a ventilation path, and an electric fan is installed in a part of this space. , a power board is disposed on the surface of the aluminum plate on the side of the ventilation passage, and a control board is disposed on the surface on the opposite side, and a radiation fin is formed on the inner surface of the portion of the aluminum plate forming the ventilation passage, and The aluminum plate is a storage box for a control device that is shaped so that a heat dissipation surface of a power element can be fixed to the aforementioned surface. (2) The storage box for a control device according to claim 1, wherein the aluminum plate is provided with a protrusion for fixing the control board and the power board, and the protrusion is machined with holes or screws. (3) The storage box for a control device according to claim 1, wherein the aluminum plate is provided with holes or screws for fixing the support or spacer.