JP4792482B2 - Fixing structure between radiator of motor control device and assembly parts - Google Patents

Description

  The present invention relates to a fixing structure between a radiator and an assembly component of a motor control device in which a circuit board on which an electronic component is mounted is housed in a housing.

  2. Description of the Related Art Conventionally, a control device such as a motor in which a circuit board on which electronic components are mounted is housed in a housing is provided with a cooling fan in order to prevent temperature rise inside the housing due to heat generated from a heating element such as a transistor attached to the circuit board. It has. In such a conventional cooling fan, the housing of the cooling fan is generally assembled to the housing using screws or the like (Patent Document 1).

However, this structure has a problem that the lead wire (cable) of the cooling fan obstructs the work when the casing is assembled.
In order to solve this problem, in Patent Document 1, after fixing the cooling fan to the fan unit in which the hook shape is arranged, the cooling fan is connected to the connector of the unit to complete the fan unit. Thereafter, the fan unit is screwed and fixed to the housing, and a structure is proposed that simplifies the lead wire routing work by fitting the fan unit at a position facing another connector on the housing side.
JP 2000-31678 A

  However, in order to realize this, it is necessary to prepare a fixing function capable of positioning and adjusting the position of the lead wire connector, and there are problems such as a complicated structure, a large number of parts, and a lot of man-hours.

  An object of the present invention is to solve the above-mentioned problems and to provide a fixing structure between a radiator and an assembly component of a motor control device capable of easily assembling an assembly component such as a cooling fan.

In order to solve the above-described problems, the present invention includes a circuit board provided with a heating element and a radiator having a cooling fin for radiating the heat generated by the heating element in the casing, and cooling the radiator. In the fixing structure of the radiator and assembly parts of the motor control equipment with a built-in cooling fan that cools the fins,
A housing in which a part of the housing part of the cooling fan is inserted in a direction perpendicular to the direction in which the cooling fins are disposed in the radiator in the housing, and the cooling fan that sends air along the cooling fins is disposed. And a fan holding portion is formed on an inner wall portion of the upper cover corresponding to a mounting position of the cooling fan that covers the upper surface of the housing, and the fan holding portion is formed on the back surface of the upper cover of the housing. are formed to protrude so as to correspond to the position of the housing of the cooling fan is formed by two rows fixing ribs, the cooling by the fan holding portion of the upper cover said top cover is assembled to the housing by the engaging claws The upper surface of the fan housing is held and the cooling fan is assembled in the housing.
According to the present invention, a notch is formed in a wall surface that partitions the radiator and the circuit board, and a lead wire of the cooling fan is assembled to the connector part of the circuit board through the notch.
Furthermore, the present invention resides in that a stepped portion is formed by notching a part of the cooling fin of the radiator, and a regenerative resistor for controlling the motor is assembled to the stepped portion.

According to the present invention, the following effects can be obtained.
According to the first aspect, parts such as screws for assembly are not required for the assembly work of the cooling fan, and the assembly work can be easily performed.
According to the second aspect, it is easy to route the lead wire of the cooling fan, and the structure can be simplified.
According to the third aspect, since the regenerative resistor for controlling the motor can be disposed in the stepped portion formed by cutting out a part of the cooling fin of the radiator, the cooling efficiency can be improved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is an exploded perspective view of a motor control device, FIG. 2 is a perspective view of a housing with a cooling fan removed, FIG. 3 is a perspective view of a first circuit board, and FIG. 4 is a back surface of an upper cover. FIG. 5 is a cross-sectional view taken along line AA of FIG. 6 is a perspective view of the housing showing the attachment position of the regenerative resistor, FIG. 7 is a plan view showing the wiring structure of the cooling fan and the regenerative resistor, and FIG. 8 is a perspective view showing the attachment position of the second circuit board. FIG. 9 is a perspective view showing a state where pumping is completed.

  FIGS. 1 to 8 show a housing 6 with a radiator 5 with the front cover 2, the upper cover 3, and the lower cover 4 of the motor control device 1 removed. The first circuit board 7 and the second circuit board 8 provided with the heat generating elements 7a and 7b are assembled, and the cooling fan 9 is assembled to the radiator 5 that cools the heat generating elements 7a and 7b. . The cooling fan 9 supports a fan motor 92 on the central axis of a housing 91 formed of a quadrilateral frame.

  The housing 6 divides the rear plate 10 side of the frame 11 including the rear plate 10 on the rear plate 10 side by a partition wall 12, and is spaced at substantially equal intervals with the rear plate 10 partitioned by the partition wall 12. A large number of cooling fins 13 are provided in parallel with each other. The portion of the first circuit board 7 provided with the heat generating elements 7a and 7b is disposed on the rear plate 10 side partitioned by the partition wall 12 so as to dissipate the heat generated by the heat generating elements 7a and 7b. Cooling fins 13 are disposed on the upper side of the heating elements 7a and 7b.

  On one side end where these cooling fins 13 are arranged, a housing recess 14 for assembling the cooling fan 9 is provided in a direction orthogonal to the direction in which the cooling fins 13 are arranged (that is, a direction crossing the cooling fins 13). A part of the housing 91 portion of the cooling fan 9 is inserted into the housing recess 14 to arrange the cooling fan 9. The cooling fan 9 is arranged with the fan motor 92 standing up toward the cooling fins 13, and sends air along the fins 13 to the gaps between the cooling fins 13. As shown in FIGS. 4 and 5, the cooling fan 9 is fixed with the upper surface of the housing 91 held by a fan holding portion 31 formed on the back surface of the upper cover 3. The fan holding portion 31 is configured by two fixing ribs 32 that protrude from the back surface of the upper cover 3 so as to correspond to the position of the housing 91 of the cooling fan 9. A cushioning material such as rubber may be provided at the tip of the fixing rib 32.

  As shown in FIGS. 2, 6, and 7, a lead wire 93 is drawn out on the side wall 91 a of the housing 91 of the cooling fan 9, and the connector 94 attached to the tip of the lead wire 93 is The U-shaped notch 12 a formed at the upper end of the partition wall 12 is connected to a connector 15 provided on the first circuit board 7. The connector 15 is connected to a power supply circuit and a control circuit, and sends a power supply and a control command to the fan motor 92 through a lead wire 93.

  A step portion 13 a that is one step lower than the upper end portion of the cooling fin 13 is formed at the upper end portion of the cooling fin 13 that is a part of the radiator 5 by cutting out the central portion with a certain length and a certain width. The regenerative resistor 16 for controlling the motor is disposed in the gap formed by the step portion 13a. The regenerative resistor 16 is screwed to the cooling holes 13 of the radiator 5 and the screw holes 13b, 12c formed at the upper end of the partition wall 12 by screws 17 through screw holes 16b provided on the upper substrate 16a. .

  The lead wires 161 and 162 of the regenerative resistor 16 are passed through the rectangular cutout portion 12b formed at the upper end portion of the partition wall 12, and the lead wires 161 and 162 are passed through the lead wires 161 and 162. The mounted regenerative resistor connectors 163 and 164 are connected to connectors 18 and 19 provided on the first circuit board 7, respectively.

  As shown in FIG. 8, the frame 11 of the housing 6 has bosses 20 erected on the left and right of the upper surface on the front side, and the second circuit board 8 is screwed into the screw holes 20 a of the bosses 20. 21 is attached. The upper cover 3 is put on the upper surface of the frame 11 of the housing 6 and fastened in combination with the lower cover 4 arranged on the lower surface of the housing 6. The motor control device 1 is assembled by assembling the front cover 2 to the front surface of the housing 6. As shown in FIG. 1, the upper cover 3 and the lower cover 4 have a pair of engagement holes 3a and 4a on the left and right sides of the front end side, and a pair of engagement claws 3b and 4b on the left and right sides of the rear end side. The rear plate 10 is engaged with a pair of engagement holes 10a and 10b formed on both sides of the upper end portion and the lower end portion of the rear plate 10 through a pair of engagement claws 3b and 4b. It has been found. On the other hand, a pair of engaging claws 2a and 2b are provided on the left and right sides of the upper and lower ends of the front cover 2, respectively, and the engaging claws 2a and 2b are respectively connected to the upper cover 3 and the lower cover. The front cover 2, the upper cover 3, and the lower cover 4 are assembled together by engaging with the engagement holes 3a, 4a of the cover 4. The front cover 2 is fastened and fixed to the front surface of the frame 11 via screws 22 as shown in FIG.

Next, the assembly procedure of the motor control device 1 will be described.
First, the first circuit board 7 is screwed to the lower surface of the frame 11 of the housing 6. Then, the engaging claws 4 b of the lower cover 4 are inserted into the engaging holes 10 b formed in the rear plate 10 of the housing 6 and assembled. Next, the cooling fan 9 is inserted and disposed in the storage recess 14 formed at the end of the cooling fin 13. The lead wire 93 of the cooling fan 9 connects the connector 94 of the lead wire 93 to the connector 15 provided on the first circuit board 7 through the notch 12a formed at the upper end of the partition wall 12 (FIG. 2, see FIG.

  Further, the motor control regenerative resistor 16 is arranged in a stepped portion 13 a formed at the upper end of a part of the cooling fin 13 of the radiator 5, and a screw hole 16 b provided in the substrate 16 a of the regenerative resistor 16. The screw 17 is screwed into the screw hole at the upper end of the cooling fin 13. The lead wires 161 and 162 of the regenerative resistor 16 are connected to the connectors 18 and 19 provided on the first circuit board 7 through the notches 12b formed at the upper end of the partition wall 12, and the connectors of the lead wires 161 and 162 are connected. 163 and 164 are connected to each other (see FIGS. 6 and 7).

Next, as shown in FIG. 8, the second circuit board 8 is attached to the boss portion 20 erected on the frame body 11 of the housing 6 through screws 21.
Then, the upper cover 3 is put on the upper surface of the frame 11 of the housing 6, and the cooling fan 9 is fixed by the fan holding portion 31 of the upper cover 3. The upper cover 3 is fastened in combination with the lower cover 4 disposed on the lower surface of the housing 6. Finally, the front cover 2 is assembled to the front surface of the frame 11 of the housing 6 via the screws 22 to complete the assembly of the motor control device 1 (see FIG. 9).

  According to the above embodiment, the first circuit board 7 and the second circuit board 8 are assembled to the frame 11 of the housing 6, and the cooling fins 13 and the cooling fan 9 of the radiator 5 are assembled together. Therefore, the motor control device 1 that is compact and easy to assemble can be provided. Moreover, since the cooling fan 9 can be fixed by the fan holding part 31 of the upper cover 3 by assembling the upper cover 3, it is possible to improve workability by omitting assembling parts. At the upper end of the cooling fin 13 that is part of the radiator 5, a step part 13 a that is one step lower is formed by cutting out the central part, and a regenerative resistor 16 for motor control is arranged in the space formed by the step part 13 a. Therefore, the installation space can be reduced and the entire apparatus can be downsized.

  Further, the inside of the housing 6 is partitioned by the partition wall 12 into a portion where the heat generating elements 7a and 7b are provided and other circuit portions, and is cooled through the notches 12a and 12b provided in the partition wall 12. Since the lead wire 93 of the fan 9 and the lead wires 161 and 162 of the regenerative resistor 16 are connected to the connector 15 and the connectors 18 and 19, a compact wiring structure can be adopted.

  The present invention is not limited only to the above-described embodiment. For example, the assembly parts are not limited to the cooling fan 9 and the regenerative resistor 16 for motor control, and are applied when other parts are assembled. You can also In addition, it goes without saying that the present invention can be implemented with appropriate modifications within a range not changing the gist of the present invention.

It is the disassembled perspective view seen from the back side of the motor control apparatus which shows embodiment of the fixing structure of the heat radiator and assembly | attachment component of the motor control apparatus of this invention. It is the disassembled perspective view seen from the front side which removes and shows a cooling fan from the heat radiator of FIG. FIG. 3 is a perspective view showing a first circuit board of FIG. 2. It is a top view which shows the fan holding | maintenance part provided in the back surface of the upper cover of FIG. FIG. 5 is a partial cross-sectional view taken along line AA in FIG. 4. It is a perspective view which shows the assembly position of the regenerative resistor for motor control of this invention. It is a top view which shows the wiring structure of the regenerative resistor for the cooling fan and motor control of this invention. It is a perspective view which shows the assembly position of the 2nd circuit board of FIG. It is a perspective view which shows the state which the assembly | attachment of the motor control apparatus of this invention was completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor control apparatus 2 Front cover 3 Upper cover 31 Fan holding part 4 Lower cover 5 Radiator 6 Case 7 1st circuit board 7a, 7b Heating element 8 2nd circuit board 9 Cooling fan 91 Housing 92 Fan 93 Lead Line 94 Connector 10 Rear plate 11 Frame 12 Partition wall 12a, 12b Notch 13 Cooling fin 13a Step 14 Recess for storage 15, 18, 19, 93, 163, 164 Connector 16 Regenerative resistor 16a Substrate 161, 162 Lead wire 17 Screw

Claims (3)

A motor control in which a circuit board provided with a heating element and a radiator having a cooling fin for radiating the heat generated by the heating element are arranged in the housing, and a cooling fan for cooling the cooling fin of the radiator is built in In the fixing structure of the equipment radiator and assembly parts,
A housing in which a part of the housing part of the cooling fan is inserted in a direction perpendicular to the direction in which the cooling fins are disposed in the radiator in the housing, and the cooling fan that sends air along the cooling fins is disposed. And a fan holding portion is formed on an inner wall portion of the upper cover corresponding to a mounting position of the cooling fan that covers the upper surface of the housing, and the fan holding portion is formed on the back surface of the upper cover of the housing. are formed to protrude so as to correspond to the position of the housing of the cooling fan is formed by two rows fixing ribs, the cooling by the fan holding portion of the upper cover said top cover is assembled to the housing by the engaging claws A structure for fixing a radiator and an assembly part of a motor control device, wherein the cooling fan is assembled in the casing while holding the upper surface of the fan housing. The notch part is formed in the wall surface which partitions off the said heat radiator and a circuit board, The lead wire of the said cooling fan was assembled | attached to the connector part of the said circuit board through the said notch part. Fixing structure between the radiator of motor control equipment and assembly parts. The radiator of the motor control device according to claim 2, wherein a stepped portion is formed by cutting a part of the cooling fin of the radiator, and a regenerative resistor for controlling the motor is assembled to the stepped portion. Fixed structure with assembly parts.

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