JPH04111393A - Housing box of control apparatus - Google Patents

Abstract

PURPOSE:To make a housing box small-sized and to lower costs by a method wherein a steel plate which has been bent so as to separate a control board from a power board is arranged and installed at the middle part of an enclosure and a power element and a heat sink are arranged and installed between the steel plate and the power board. CONSTITUTION:A control board 13 and a power board 14 are fixed respectively to both faces of a shielding plate 12. Thereby, an electromagnetic noise generated on the power board 14 is shielded and it is possible to prevent the malfunction of an element on the control board 13. When signals between the control board 13 and the power board 14 are connected by using a flat cable 15, the wiring operation of an electric-motor drive apparatus is completed collectively. In addition, since all elements excluding a power element 18 are mounted on the control board 13 and the power board 14 which are not faced with the shielding plate 12, the elements on the control board 13 and the power board 14 can be adjusted fine and a circuit operation can be confirmed in this state. In addition, when the power element 18 and a heat sink 19 are arranged and installed inside the space formed of the power board 14 and the shielding plate 12, the space inside an enclosure can be utilized effectively and the cooling effect of the heat sink 19 can be increased by the heat- dissipating effect of the shielding plate 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a motor which drives an electric motor based on an external command.
This relates to a storage box for the III device.

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.

FIG. 2 shows the internal structure of a conventional motor drive device. In FIG. 2, 1 is a metal case that forms a housing, and 2 is a rice plate 3 that is fixed to the metal case 1 and sends signals to the power elements on the power board in response to commands from the outside.
4 is a power board fixed to a mounting part provided on the metal case 1 and supplies power to the electric motor; 4 is fixed to a mounting part provided on the metal case 1 between the control board 2 and the power board; A plate made of a steel plate for electromagnetic shielding to prevent elements on the control board 2 from malfunctioning due to noise; 5 is a flat cable connecting electrical signals between the control board 2 and the power board 3; 6 is a flat cable for supplying electric signals to the motor; A power element such as a power transistor that outputs electric power, 7 a heat radiator fixed outside the metal case 1 and having a power element 6 attached thereto, and 8 a support for fixing the power board 3 to the heat radiator 7.

As mentioned above, conventional storage boxes for control devices are equipped with heat sinks to increase the heat dissipation efficiency of power elements, and to prevent elements on the control board from malfunctioning due to electromagnetic noise generated on the power board. In order to prevent this, an electromagnetic shielding plate made of steel is interposed between the control board and the power board.

Problems to be Solved by the Invention However, it is difficult to miniaturize the conventional configuration described above because the heat sink is placed outside the housing, and the space where the power board is fixed is limited to the metal case and electromagnetic shielding. The problem is that fine adjustment of the operation of the electronic components on the power board must be done before the power board is assembled alone, which requires a lot of man-hours.

The present invention solves the above-mentioned conventional problems by arranging a heat sink attached to a power element inside a housing,
It enables miniaturization by saving space, and also allows fine adjustment of the operation of each electronic component with the power board and control board connected, that is, with the wiring inside the motor drive device completed, reducing the number of adjustment steps. The purpose of this invention is to provide a storage box for control devices that can be used as a control device.

Means for Solving the Problems In order to achieve this object, the storage box for a control device of the present invention has a steel plate bent in an L-shape or a step shape, disposed in the middle part of the casing, and the bent portion of the steel plate A control board is disposed on the opposite side of the steel plate, a power board is disposed on the opposite side of the steel plate, and a power element and a heat sink are disposed between the steel plate and the power board.

Effect This configuration prevents the elements on the control board from malfunctioning due to electromagnetic noise generated on the power board, and also saves space because the heat sink for cooling the power elements is housed inside the housing. The heat dissipation effect of the steel plate allows the heatsink to be made smaller, making it possible to further save space.Also, since the control board and power board can be fixed to both sides of the steel plate, the control board and power board can be connected. In this state, that is, in a state in which the wiring inside the motor drive device is completed, the operation of each electronic component can be finely adjusted, and the number of steps for adjustment can be reduced.

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, 11 is an open metal case forming a housing, 12 is located in the middle of the metal case 11 and is fixed, and the end is bent into a step shape.
A shielding plate 13 made of a steel plate that forms a ventilation path with the inner wall of the metal case 11 is fixed to the surface of the l closing plate 12 via a support 16, and receives an external command from the power board 14.
A control board that sends a signal to the power element 18 above, 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 motor, and 15 is a board between the control board 13 and the power board 14. Flat cable for connecting signals, 19
2 is a radiator for cooling the power element 18, and 20 is a screw for fixing the radiator 19 to the shielding plate 12. Power board 14. The power element 18 is located within the ventilation path formed by 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.
2 shields electromagnetic noise generated on the power board 14 and prevents 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, since all the elements except the power element 18 are mounted on the surfaces of the control board 13 and the power board 14 that do not face the slow closing plate 12, fine adjustment of the elements on the control board 13 and the power board 14 can be made in this state. and can confirm circuit operation. Furthermore, by arranging the power element 18 and the heat radiator 19 in the space formed by the power board 14 and the slow closing plate 12, the space inside the housing can be used effectively, and the heat can be radiated by the heat dissipation effect of the slow closing plate 12. The cooling effect of the container 19 is enhanced. In addition,
The means for fixing the control board and the power board to the slow-closing board is to provide a cut-and-raised part in the slow-closing board and machine holes or screws in this part, or machine holes or threads for fixing the support. Ensure insulation space. Additionally, holes or screws are formed in the slow closing plate so that it can be fixed to the side plate of the housing.

As described above, according to this embodiment, inside the metal case,
A slow-closing plate is fixed to separate the control board and the power board, and has holes or screws for fixing the support for fixing the control board and the power board, thereby shielding electromagnetic noise generated on the power board, It can prevent the elements on the control board from malfunctioning, and by arranging the power element and heatsink in the space between the bent part of the slow closing plate and the power board, the cooling effect of the heatsink is improved. Therefore, the heat sink can be made smaller, and furthermore, the operation of the elements on the power board and the control board can be finely adjusted and confirmed at the same time. In addition, placing the heatsink in the space between the power board and the slow-closing board saves space, and by fixing the heatsink to the slow-closing board so that it is in contact with the slow-closing board, the cooling effect of the heatsink is improved. The heat sink can be downsized, and the control device can be downsized. In addition, by making use of the heat dissipation effect of the slow-closing plate provided for electromagnetic shielding of the control board and power board, and reducing the size of the heat radiator, the cost of the control device as a whole is reduced. Furthermore, the ability to fine-tune the operation of the elements on the power board and control board and check the circuit operation at the same time makes it possible to reduce the number of man-hours and reduce costs.

Effects of the Invention As described above, the present invention provides a slow-closing plate made of a steel plate that separates a control board and a power board, interposed inside a metal case forming a housing, and a bent portion of the slow-closing board and a power board. Space can be saved by placing the power element and heatsink in the space between them, and by fixing the heatsink in contact with the slow-closing plate and using the slow-closing plate as a heatsink, Since the heat sink can be made smaller, the control device storage box can be made smaller and the cost can be reduced by saving space. Furthermore, since electromagnetic noise generated on the power board can be shielded, malfunctions of elements on the control board can be prevented, and the reliability of the control device is improved. Furthermore, since fine adjustment of the operation of the elements on the power board and control board and confirmation of the operation of the circuit can be made at the same time, costs can be reduced by reducing the number of man-hours.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the internal structure of a control device storage box according to an embodiment of the present invention, and FIG. 2 is a diagram showing the internal structure of a conventional control device storage box. 11...Metal case, 12...Late closing plate, 13...Control board, 14...Power board, 15...Flat cable , 16.17
..... Support column, 18 ..... Power element, 19
... Heatsink, 20 ... Screw.

Claims (4)

[Claims] (1) A steel plate bent into an L-shape or step shape is placed in the middle of the casing, a control board is placed on the bent part of the steel plate, and a power board is placed on the opposite surface. . A storage box for a control device, further comprising a power element and a radiator arranged between the steel plate and the power board, and the radiator fixed so as to be in contact with the steel plate. (2) The storage box for a control device according to claim 1, wherein the steel plate is provided with a cut-and-raised portion for fixing the control board and the power board, and a hole or a screw is machined in this portion. (3) The storage box for a control device according to claim 1, wherein the steel plate is formed with holes or screws for fixing the support or spacer. (4) The storage box for a control device according to claim 1, wherein the steel plate is formed with holes or screws for fixing the side plates of the housing.