JP2005243741A - Cabinet structure of drive unit for driving motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of processing steps and assembling steps for a sheet metal and to easily move a fixture leg for securing a cabinet to a given position. <P>SOLUTION: When a front cover 27-1 is secured, it is placed on four high-strength struts 3 of ventilation covers 1a-1 and 1b-1 fitted respectively to a top panel and a bottom panel, and it is screwed. In addition, a trellis with a clearance enough for preventing fingers or foreign matters from entering is fitted integrally with the ventilation covers 1a-1 and 1b-1 in an air inlet 12-1. Then, a ventilation guide 5 on an inclined face of about 45° is provided in a horizontal beam on the rear surface of the frame 12c of the air inlet 12-1. The ventilation covers 1a-1 and 1b-1 are screwed to an internal sheet metal 17, and in this state, a fixture leg 21 is secured to a tap hole 4 or 9 arranged on the front surface or rear surface of the frame 12c by the same screw in size as the above screw. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a housing structure of a drive unit for driving a motor applied to an inverter device having a relatively large energization capacity.

4A and 4B show a housing structure of a conventional motor driving drive unit (hereinafter also simply referred to as a unit). FIG. 4A is a perspective view showing the bottom side of the motor driving drive unit, and FIG. 4B shows the top side. FIG. FIG. 5 is a development view of the drive unit for driving the motor in the arrangement state shown in FIG. 6 shows the structure of the ventilation cover of the casing of the motor driving drive unit shown in FIG. 4, wherein (a) is a perspective view of the ventilation cover on the outer surface side of the casing of the motor driving drive unit, and (b) is the inner surface side of the casing. It is a perspective view of the ventilation cover.
The motor drive unit includes an air-cooled inverter comprising a main circuit including a semiconductor module, a control circuit and a heat-dissipating fin thermally coupled to the main circuit component, and a blower fan for cooling the heat of the heat-dissipating fin. Suppose that it is a device.

  As shown in each of the above drawings, the casing of the unit has a rectangular parallelepiped shape, and ventilation covers 1a and 1b are disposed on the top and bottom openings of the casing. Both the bottom and top ventilation covers 1a and 1b have the same structure, have substantially the same width W as the case, and have about half the depth D from the back to the front of the case. The bottom ventilation cover 1a is fitted into the lower half of the opening from the back of the casing to the vicinity of the position of the ground wire connection terminal 20, and the top ventilation cover 1b extends from the rear of the casing to the top sheet metal 11. It fits into the lower half opening.

The ventilation covers 1a and 1b are provided with ventilation holes 12 for cooling the heat radiating fins. Since the openings can easily touch a device such as a blower fan inside the unit, the ventilation openings are provided. A fan guard 13 is attached to 12 so that hands and foreign objects cannot be inserted.
Further, on the outer surface of the frame body around the vent hole 12, a mounting leg fixing surface 14a is provided in the width W direction on the front side, and a mounting leg fixing surface 14b is provided in the width W direction on the back side. The mounting leg fixing surfaces 14a and 14b are provided with a plurality of mounting leg mounting holes 15a and 15b for fixing the mounting leg 21 with screws to fix the unit to a wall surface or the like. However, as shown in FIG. 4, the attachment leg 21 is shown attached to one attachment leg fixing surface 14b on the back side with an attachment screw, but this is removed and attached to the other attachment leg fixing surface 14a. Can also be attached with mounting screws.

  One set of mounting leg mounting holes 15a is a through hole through which an M5 size mounting screw passes, and the other set of mounting leg mounting holes 15b is a tap hole into which an M6 size mounting screw is screwed. When the mounting leg 21 is mounted on one mounting leg fixing surface 14a, a mounting screw that passes through the mounting leg 21 is further passed through the mounting leg mounting hole 15a, and the capacitor 23 and the heat dissipating fin 25 are fixed to the internal sheet metal 17. Screw into the provided tapped hole. As a result, both the attachment legs 21 are attached to the ventilation covers 1a and 1b with the same attachment screw and the ventilation covers 1a and 1b are attached to the internal sheet metal 17.

Usually, since the mounting leg 21 is not mounted on the mounting leg fixing surface 14a, a mounting screw is passed through the mounting leg mounting hole 15a and screwed into a tap hole of the internal sheet metal 17, thereby fixing the ventilation covers 1a and 1b. ing. Further, the mounting leg 21 is fixed to the other mounting leg fixing surface 14b with an M6 size mounting screw. This is because when the mounting leg 21 is fixed to a wall surface or the like, a mounting strength higher than a predetermined level is required.
Further, the peripheral portions of the side surface metal plate 10 and the top surface metal plate 11 on both sides surrounding the ventilation covers 1a and 1b are bent to increase the strength of the housing (see Patent Document 1).
JP 2000-60135 A

However, in the case structure of the conventional motor drive unit, the peripheral portions of the side plate 10 and the top plate 11 on both sides must be bent in order to increase the strength of the case. There is a problem that man-hours increase.
In addition, since the front cover must be screwed to the weak parts where the side metal plates 10 are bent on both sides, in order to increase the fixing strength, at least the two ends and the center of these two locations × 2 = 6 pieces Therefore, there is a problem that the number of assembly steps increases.

Further, when the attachment leg 21 usually attached to the rear side is moved and attached to the front side, the attachment leg 21 is removed and screwed into the inner sheet metal 17 through the attachment leg attachment hole 15a on the front side. After removing the ventilation screws 1a and 1b, the mounting screws must be passed through the mounting legs 21 and the mounting leg mounting holes 15a and screwed into the tap holes of the internal sheet metal 17. . For this reason, there is a problem that the mounting leg 21 cannot be easily moved to another predetermined position.
The present invention has been made in view of such a problem, and can reduce the processing man-hours and assembly man-hours of sheet metal, and can easily move the mounting legs for fixing the housing to other predetermined positions. An object of the present invention is to provide a housing structure for a motor-driven drive unit.

  In order to achieve the above object, a housing structure of a drive unit for driving a motor according to claim 1 of the present invention includes at least an electric circuit that performs drive control of a motor and a radiating fin thermally coupled to an electric component and the radiating fin. A motor in which a blower fan that cools a fan is housed in a substantially rectangular parallelepiped housing, and a ventilation cover is provided on the top and bottom surfaces of the housing that has a ventilation opening that allows air to pass through one of the other surfaces. In the housing structure of the drive unit for driving, the ventilation cover protrudes from the frame around the ventilation port to the front side, and includes a support column having a mounting surface of the front cover of the housing and a screw hole at the protruding tip. It is characterized by that.

  According to this configuration, when the front cover is attached, the front cover is placed on the four high-strength struts of the ventilation cover attached to the top surface and the bottom surface, and then can be assembled with ease by screwing. Can do. Conventionally, since it was screwed to the unstable bent portion of the side plate of the housing, at least six screws were necessary for stabilization, but in the present invention, only four screws are required, and the number of assembly steps is accordingly increased. Can be reduced. Moreover, attachment can be performed more easily than attaching to the bent portion of the side plate.

Furthermore, conventionally, in order to increase the strength of the casing, it is necessary to bend the peripheral portions of the side sheet metal on both sides and the top sheet metal attached to the ventilation cover on the top surface side. However, in the present invention, both the side sheet metal and the top sheet metal are not necessary, so that the number of processing steps can be reduced.
According to claim 2 of the present invention, the housing structure of the drive unit for driving the motor according to claim 1 has an interval at which the human body and foreign matter having a predetermined size cannot enter the frame body from the ventilation port. It is characterized by the fact that the lattice is attached integrally.

According to this configuration, a retrofitted fan guard as in the prior art is not required at the ventilation opening, and the number of assembling steps can be reduced accordingly.
According to a third aspect of the present invention, there is provided a housing structure for a motor-driven drive unit according to the first or second aspect, wherein the frame body is formed on the inner side of the frame from the one of the top surface and the bottom surface toward the other surface. It is characterized by providing an inclined surface.

According to this configuration, for example, by providing an inclined surface of 45 degrees, the speed of the air passing from the top surface to the bottom surface by the blower fan is increased, and the cooling effect of the radiation fins can be improved accordingly.
According to a fourth aspect of the present invention, there is provided a housing structure for a drive unit for driving a motor according to any one of the first to third aspects, wherein the housing is provided on the back side and the front side of the housing in the frame. Screw holes for fixing the mounting legs for mounting on surfaces other than the housing are arranged and arranged in parallel to the screw holes in the housing portions other than these screw holes, and the ventilation cover is attached to the inner sheet metal of the housing. It is characterized by providing a through hole for screwing.

  According to this configuration, the ventilation cover is fixed to the internal sheet metal with screws, and in this state, the mounting legs can be fixed to the screw holes arranged on the front side or the back side of the frame body with screws of the same size. This eliminates the need for the complicated work of removing the mounting legs and once removing the ventilation cover from the internal sheet metal and screwing the mounting legs and the internal sheet metal thereafter. Therefore, the mounting leg can be easily moved to another predetermined position.

  As described above, according to the housing structure of the drive unit for motor driving of the present invention, the processing man-hours and assembly man-hours of sheet metal can be reduced, and the mounting legs for fixing the housing can be easily moved to other predetermined positions. There is an effect that can be done.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, parts corresponding to each other in all the drawings in this specification are denoted by the same reference numerals, and description of the overlapping parts will be omitted as appropriate.
FIG. 1 shows a housing structure of a motor driving drive unit according to an embodiment of the present invention, (a) is a perspective view showing the bottom side of the motor driving drive unit, and (b) shows the top side. It is a perspective view. FIG. 2 is a development view of the drive unit for driving the motor in the arrangement state shown in FIG. 3 shows the structure of the ventilation cover of the casing of the motor driving drive unit shown in FIG. 1, (a) is a perspective view of the ventilation cover on the outer surface side of the casing of the motor driving drive unit, and (b) is the inner surface side of the casing. It is a perspective view of the ventilation cover.

  The casing of this unit shown in these drawings has a rectangular parallelepiped shape, and ventilation covers 1a-1 and 1b-1 are arranged at the top and bottom openings of the casing. The ventilation covers 1a-1 and 1b-1 on the bottom surface and the top surface side have the same structure, have substantially the same width W as the housing, and have a ventilation opening at a size portion of about half the depth D from the back surface to the front surface of the housing. 12-1 and further, a support column 3 protruding from both ends of the cross beam portion on the front side of the frame 12c around the ventilation hole 12-1 to the mounting position of the front cover 27-1.

A portion surrounded by the three sides of the front surface of the frame body 12c and the two support columns 3 of the ventilation opening 12-1 has a width W and a depth substantially D when the ventilation cover 1a-1 is attached to the top surface. It becomes the opening 2a to which the rectangular top metal plate 11-1 having a size of / 2 is attached. Further, when the ventilation cover 1b-1 is attached to the bottom surface side, the opening 2b into which electric wiring from the outside is drawn is formed.
The ventilation port 12-1 is configured such that a plurality of vertical columns 12 b orthogonal to the horizontal column 12 a are arranged in a grid pattern at predetermined intervals on a horizontal column 12 a that crosses the center of the opening, so that human hands, foreign objects, etc. It is configured not to enter.

In addition, an inclined surface of approximately 45 degrees is provided on the inner side of the unit from the lower end of the lattice portion toward the back side of the cross beam portion on the back side of the frame body 12c of the vent 12-1. This inclined surface portion is called a ventilation guide 5. By providing the ventilation guide 5, the speed of the air passing from the top surface side to the bottom surface side by the blower fan is increased, and the cooling effect of the radiation fins 25 is improved.
Each support column 3 has an L-shaped cut surface and has high strength. Moreover, the edge part of the support | pillar 3 becomes the plane 3a, The tap hole 3b by which the front cover 27-1 is mounted and screwed is formed in this plane 3a. Therefore, when attaching the front cover 27-1, after placing the front cover 27-1 on the plane 3a of the four columns 3 of the ventilation covers 1a-1 and 1b-1 attached to the top and bottom surfaces, It fixes by screwing a screw in the tap hole 3b.

Further, in the cross beam portion on the front surface side of the frame body 12c, three through holes 8 for threading M5 size are formed on both sides and the center. These through holes 8 are for fixing the ventilation covers 1a-1 and 1b-1 to the internal sheet metal 17 in the unit with screws. That is, the ventilation covers 1 a-1 and 1 b-1 are screwed to the internal sheet metal 17 through the through holes 8.
Further, three tapped holes 4 for M6 screws for attaching and fixing the mounting legs 21 are formed in the lateral beam portion on the back side of the frame 12c at both sides and the center. Further, tapped holes 9 for M6 size screws for attaching and fixing the mounting legs 21 to the cross beam portions provided between the pillars 3 on both sides on the front side of the frame 12c are provided on both sides and the center. Three places are formed. That is, when attaching the attachment leg 21 to the ventilation covers 1a-1 and 1b-1, the attachment leg 21 is fixed to the tap holes 4 or 9 arranged on the front side or the back side with the same M6 size screw.

Further, on both side surfaces of the ventilation covers 1a-1 and 1b-1, three tap holes 10a for attaching the flat side plate 10-1 are formed at the upper and lower ends and the center. Therefore, when attaching the side sheet metal 10-1, after fixing the side sheet metal 10-1 to a predetermined position, it is fixed by screwing the screw into the tap hole 10a.
According to the case structure of the motor drive drive unit of this embodiment, when the front cover 27-1 is attached, the high strength of the ventilation covers 1a-1 and 1b-1 attached to the top and bottom surfaces. After the front cover 27-1 is placed on the four columns 3, the screws can be easily assembled. Conventionally, six screws are used, but in this embodiment, four screws are sufficient. Accordingly, the assembly man-hour can be reduced.

Conventionally, in order to increase the strength of the housing, it has been necessary to bend the peripheral portions of the side sheet metal 10 and the top sheet metal 11 on both sides. In this embodiment, both the side surface metal plate 10-1 and the top surface metal plate 11-1 are not necessary, so that the number of processing steps can be reduced.
In addition, since the air passage 12-1 is integrally attached to the ventilation covers 1a-1 and 1b-1 with a lattice of gaps where human hands or foreign objects do not enter the unit, the fan guard 13 is not required as in the prior art. Thus, the number of assembly steps can be reduced accordingly.

Further, since the ventilation guide 5 having an inclined surface of about 45 degrees is provided in the lateral beam portion on the back side of the frame body 12c of the ventilation opening 12-1, the speed of the air passing from the top surface side to the bottom surface side by the blower fan is increased. Therefore, the cooling effect of the radiation fin 25 can be improved accordingly. However, the inclined surface may be any number of times as long as the air velocity is higher than that without the inclined surface.
The ventilation covers 1a-1 and 1b-1 are fixed to the internal sheet metal 17 with screws. In this state, the mounting legs 21 are inserted into the tap holes 4 or 9 arranged on the front side or the back side of the frame 12c. Can be fixed with screws of the same size. As a result, as in the prior art, the mounting leg 21 is removed, and the ventilation covers 1a and 1b are once removed from the internal sheet metal 17, and then screwed to the mounting leg 21 and the internal sheet metal 17 is performed. It becomes unnecessary. Therefore, the mounting leg 21 can be easily moved to another predetermined position.

The housing structure of the drive unit for motor drive which concerns on embodiment of this invention is shown, (a) is the perspective view which showed the bottom face side of the drive unit for motor drive, (b) is the perspective view which showed the top | upper surface side. . It is an expanded view of the drive unit for motor drive of the arrangement | positioning state shown to Fig.1 (a). 1 shows the structure of the ventilation cover of the motor drive drive unit housing shown in FIG. 1, (a) is a perspective view of the ventilation cover on the outer surface side of the motor drive drive unit, and (b) is the ventilation cover on the inner surface side of the housing. FIG. The housing structure of the conventional motor drive drive unit (henceforth only a unit) is shown, (a) is the perspective view which showed the bottom face side of the drive unit for motor drive, (b) The perspective view which showed the top side It is. FIG. 5 is a development view of the drive unit for driving the motor in the arrangement state shown in FIG. 4 shows the structure of the ventilation cover of the motor drive drive unit housing shown in FIG. 4, (a) is a perspective view of the ventilation cover on the outer surface side of the motor drive drive unit, and (b) is the ventilation cover on the inner surface side of the housing. FIG.

Explanation of symbols

1a, 1a-1, 1b, 1b-1 Ventilation cover 2a, 2b Opening 3 Post 3a Plane 3b, 4, 9, 10a Tap hole 5 Ventilation guide 8 Through hole 11, 11-1 Top sheet metal 12, 12-1 Ventilation hole 12c Frame 12a Horizontal column 12b Vertical column 13 Fan guard 14a, 14b Mounting leg fixing surface 15a, 15b Mounting leg mounting hole 17 Internal sheet metal 21 Mounting leg 10, 10-1 Side sheet metal 20 Ground wire connection terminal 23 Capacitor 25 Heat dissipation Fin 27, 27-1 Front cover

Claims (4)

At least an electric circuit that controls the drive of the motor, a radiating fin that is heat-transfer coupled to the electric component, and a blower fan that cools the radiating fin are housed in a substantially rectangular parallelepiped casing. In the housing structure of the drive unit for motor drive formed by attaching a ventilation cover having a ventilation port through which air passes from one side to the other side,
The motor-driven drive unit is characterized in that the ventilation cover is provided with a column having a mounting surface of a front cover of the housing and a screw hole at a protruding end protruding from a frame body around the ventilation opening to the front side. Housing structure. The housing of the motor drive drive unit according to claim 1, wherein a lattice having a space at which a human hand or a foreign object having a predetermined size cannot enter the housing from the ventilation port is integrally attached to the frame. Construction. 3. The motor drive drive unit housing according to claim 1, wherein an inclined surface is provided on the inner side of the frame body in a direction from one of the top surface and the bottom surface to the other surface. 4. Construction. Arrange screw holes for fixing the mounting legs for attaching the casing to a surface other than the casing on the back side and the front side of the casing in the frame,
4. A through hole for screwing the ventilation cover to an internal sheet metal of the housing is provided in a portion of the housing other than the screw holes in parallel with the screw hole. 2. A housing structure of a drive unit for driving a motor according to item 1.

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