阅读说明：本技术 电动机驱动装置 (Motor driving device ) 是由 山本和弘 于 2020-11-19 设计创作，主要内容包括：本发明提供一种电动机驱动装置。该电动机驱动装置能够容易地更换风扇电动机单元,并且在更换风扇电动机单元时不会污染电动机驱动装置主体的内部。安装于控制板的电动机驱动装置包括：电动机驱动装置主体；散热器,其配置于电动机驱动装置主体的背面侧；风扇电动机单元,其配置于散热器的上方,设为能够以经过电动机驱动装置主体的上方的方式被抽出；以及垫板构件,其在抽出风扇电动机单元时沿着风扇电动机单元的抽出路径展开。(The invention provides a motor driving device. The motor drive device can easily replace the fan motor unit, and does not contaminate the inside of the motor drive device main body when the fan motor unit is replaced. The motor drive device mounted on the control board includes: a motor drive device main body; a heat sink disposed on a back surface side of the motor drive device main body; a fan motor unit disposed above the heat sink and capable of being drawn out through the upper side of the motor drive device main body; and a backing plate member that is deployed along a drawing path of the fan motor unit when the fan motor unit is drawn out.)

1. A motor driving device is mounted on a control board, and is characterized in that,

the motor drive device includes:

a motor drive device main body;

a heat sink disposed on a back surface side of the motor drive device main body;

a fan motor unit disposed adjacent to the heat sink and capable of being drawn out so as to pass through the vicinity of the motor drive device main body; and

a pad member that is spread along a drawing path of the fan motor unit when the fan motor unit is drawn out.

2. The motor drive device according to claim 1,

one end of the backing plate member is attached to the vicinity of the start end of the drawing path,

the other end side of the pad member is configured to be deployed along the extraction path.

3. The motor drive device according to claim 1 or 2,

the other end portion of the pad member has a holding member for holding the expanded state.

4. The motor drive device according to claim 1,

one end of the backing member is attached to the vicinity of the start end of the drawing path, and the other end of the backing member is detachably attached to the fan motor unit, and the backing member is configured to be spread along the drawing path in conjunction with the drawing operation of the fan motor unit.

5. The motor drive device according to any one of claims 1 to 4,

the motor drive device main body has a pair of wall plate members arranged so as to sandwich the drawing path of the fan motor unit from both sides,

the inner surfaces of the pair of panel members have a pair of rail members constituting the drawing path,

the pad member is deployed along the pair of rail members.

6. The motor drive device according to any one of claims 1 to 5,

the pad member before being unfolded may be in any one of a roll shape, a folded shape, and a wave shape.

Technical Field

The present invention relates to a motor drive device.

Background

Generally, a motor drive device to be mounted on a control board of an industrial machine driven by a motor, such as a machine tool, includes a motor drive device main body, a heat sink for dissipating heat from the motor drive device main body, and a fan motor unit for cooling the heat sink. The fan motor unit is often stopped due to adhesion of dirt, and is removed from the motor drive device and replaced each time the rotation is stopped. Therefore, the efficiency of the replacement work of the fan motor unit is required.

Conventionally, in order to facilitate the replacement work of the fan motor unit, there is known a technique in which the fan motor unit is attachable and detachable in a direction of a front side (a side where a control board is operated) (for example, see patent document 1).

Patent document 1: japanese patent No. 4734299

Disclosure of Invention

Problems to be solved by the invention

Generally, the heat sink is disposed on the back side of the motor drive device main body, and the fan motor unit is disposed above the heat sink. Therefore, when the fan motor unit is pulled out and detached to the front side, the fan motor unit passes above the motor drive device main body. In this case, contaminants such as dirt and oil adhering to the fan motor unit may fall into the motor drive device body through the upper air vent of the motor drive device body, thereby contaminating the inside of the motor drive device body. Therefore, a motor drive device that can easily replace the fan motor unit and that does not contaminate the inside of the motor drive device main body when the fan motor unit is replaced is desired.

Means for solving the problems

One technical solution of the present disclosure is a motor driving device, which is installed on a control board, wherein the motor driving device includes: a motor drive device main body; a heat sink disposed on a back surface side of the motor drive device main body; a fan motor unit disposed adjacent to the heat sink and capable of being drawn out so as to pass through the vicinity of the motor drive device main body; and a backing plate member that is deployed along a drawing path of the fan motor unit when the fan motor unit is drawn out.

In the motor drive device, one end portion of the pad member may be attached to the vicinity of the start end of the drawing path, and the other end portion side of the pad member may be configured to be spread along the drawing path.

In the motor drive device, the other end portion of the pad member may include a holding member for holding the deployed state.

In the motor driving device, one end portion of the backing member may be attached to the vicinity of a start end of the drawing path, and the other end portion of the backing member may be detachably attached to the fan motor unit, and the backing member may be configured to be spread along the drawing path in conjunction with a drawing operation of the fan motor unit.

In the motor drive device, the motor drive device main body may include a pair of wall members disposed so as to sandwich the drawing path of the fan motor unit from both sides, the wall members may have a pair of rail members on inner surfaces thereof, the rail members constituting the drawing path, and the backing plate member may be spread along the rail members.

In the motor drive device, the backing member before being unfolded may be in any one of a roll shape, a folded shape, and a corrugated shape.

ADVANTAGEOUS EFFECTS OF INVENTION

According to one aspect, a motor drive device can be provided that can easily replace a fan motor unit and that does not contaminate the inside of a motor drive device main body when the fan motor unit is replaced.

Drawings

Fig. 1 is a side view showing a motor drive device 1 mounted on a control board.

Fig. 2 is an enlarged side view of a part of the motor drive device according to embodiment 1.

Fig. 3 is a side view showing a state in which the motor drive device according to embodiment 1 spreads a roll-shaped pad member.

Fig. 4 is a side view showing a state in which the fan motor unit of the motor drive device according to embodiment 1 is replaced.

Fig. 5 is a perspective view showing a state in which the fan motor unit of the motor drive device according to embodiment 1 is replaced.

Fig. 6 is an enlarged side view of a part of the motor drive device according to embodiment 2.

Fig. 7 is an enlarged side view of a roller-shaped pad member of the motor drive device according to embodiment 2.

Fig. 8 is a side view showing a state in which the fan motor unit of the motor drive device according to embodiment 2 is replaced.

Fig. 9 is a side view showing a state in which the fan motor unit of the motor drive device according to embodiment 2 is replaced.

Fig. 10 is a perspective view showing the motor drive device according to embodiment 3.

Fig. 11 is an enlarged side view of a part of the motor drive device according to embodiment 3.

Fig. 12 is a side view showing a state in which the fan motor unit of the motor drive device according to embodiment 3 is replaced.

Fig. 13 is a side view showing a pad member according to another embodiment.

Fig. 14 is a side view showing a pad member according to still another embodiment.

Description of the reference numerals

1. 1A, 1B, a motor drive device; 11. a motor drive device main body; 11a upper surface (of the motor drive device main body); 111. a wallboard member; 111a, an inner surface (of a wall member); 112. a track member; 12. a heat sink; 13. a fan motor unit; 2. 2A, 2B, a pad member; 2a one end portion (of the pad member); 2b, the other end (of the pad member); 22. a holding member; 100. a control panel; p1, start of extraction route.

Detailed Description

[ embodiment 1 ]

Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a side view showing a motor drive device 1 mounted on a control board. Fig. 2 is an enlarged side view of a part of the motor drive device according to embodiment 1.

As shown in fig. 1, the motor drive apparatus 1 is mounted on a control board 100. A motor drive mounting plate 103 of the motor drive 1 is attached to the control plate 100 along a rear panel 102 disposed in parallel with an openable and closable front panel 101.

The motor drive device 1 includes: a motor drive device main body 11 provided inside the control plate 100 between the front surface plate 101 and the rear surface plate 102 so as to protrude from the motor drive device mounting plate 103 toward the front surface plate 101 side; a heat sink 12 attached to the back side of the motor drive device body 11 (the side opposite to the motor drive device body 11 with the motor drive device attachment plate 103 interposed therebetween); and a fan motor unit 13 disposed above the heat sink 12.

The heat sink 12 includes, for example, a plurality of fins extending in the up-down direction. However, the heat sink 12 shown in each figure is not shown with fins for simplicity, but is shown in a rectangular box shape. Heat sink 12 penetrates an opening (not shown) formed in rear surface plate 102 of control board 100 and protrudes outside control board 100. Therefore, the radiator 12 and the fan motor unit 13 are disposed outside the control board 100 and covered with the radiator cover 200 attached to the back surface side of the rear surface plate 102 (the outer surface side of the control board 100).

As shown in fig. 2, the fan motor unit 13 includes: fan motor 131, support plate 132 for supporting fan motor 131, and front plate 133 attached to support plate 132 and disposed on the front surface side (front plate 101 side) of fan motor 131. Support plate portion 132 has an air outlet (not shown) for allowing air to flow through heat sink 12 by the rotational drive of fan motor 131.

The motor drive device mounting plate 103 has an opening 104 disposed above the motor drive device main body 11. Opening 104 has a size that allows fan motor 131 and support plate 132 of fan motor unit 13 to pass therethrough without allowing front plate 133 to pass therethrough. As shown in fig. 2, in the mounted state in which fan motor unit 13 supported by support plate section 132 is disposed above heat sink 12, front plate section 133 is disposed so as to completely cover opening 104 provided in motor drive device mounting plate 103 from the inside of control board 100.

The fan motor unit 13 can be drawn out to pass near the motor drive device main body 11 by drawing out the front plate portion 133 in the direction toward the front plate 101 from the attached state at the time of replacement work. Specifically, the fan motor unit 13 can be drawn out to pass above the motor drive device main body 11. In the motor drive device 1, the upper side of the upper surface 11a of the motor drive device main body 11 constitutes a drawing path of the fan motor unit 13 during replacement work. In the drawing path of the fan motor unit 13, the opening 104 side is a start end P1, and the front panel 101 side is a final end P2. In the following description, the direction along the drawing path from the start end P1 side to the end P2 side is defined as "forward".

The pad member 2 is disposed near the start end P1 of the drawing path. The backing plate member 2 of the present embodiment is formed of a strip-like body wound in a roll shape, and is disposed on the upper surface 11a of the motor drive device main body 11 near the opening 104. The length and width of the backing member 2 in the expanded state are set to a length and width that can cover an upper air vent (not shown) provided in the upper surface 11a of the motor drive main body 11 during replacement work of the fan motor unit 13, so as to prevent the contaminant X falling from the fan motor unit 13 from entering the inside of the motor drive main body 11.

The material of the backing plate member 2 can be used without limitation as long as it can catch the contaminants falling from the fan motor 131 and prevent them from falling into the motor drive device main body 11 at the time of replacement work of the fan motor unit 13. Specifically, the pad member 2 may be a sheet formed of any one of materials such as metal, resin, rubber, paper, and cloth, or a sheet formed of a composite material of two or more kinds. The pad member 2 may have elasticity.

As shown in fig. 2, one end 2a (end on the side of the start end P1 of the drawing path) of the pad member 2 is attached near the start end P1 of the drawing path. More specifically, the vicinity of the start end P1 of the extraction path is between the motor drive device mounting plate 103 and the upper vent that is the closest to the opening 104 among the plurality of upper vents (not shown) disposed on the upper surface 11a of the motor drive device main body 11. Since the one end portion 2a of the pad member 2 is attached to the vicinity of the start end P1 of the extraction path, the upper air vent of the upper surface 11a of the motor drive device main body 11 can be covered without leakage when the pad member 2 is expanded. One end portion 2a of the backing plate member 2 of the present embodiment has a mounting member 21. The backing plate member 2 is attached to the motor drive device attachment plate 103 below the opening 104 by the attachment member 21.

The mounting member 21 may be not detachable from the motor drive device mounting plate 103 by a fastening member such as a screw, an adhesive, or the like, or may be detachable from the motor drive device mounting plate 103. When the mounting member 21 is detachable from the motor drive device mounting plate 103, the mounting member 21 may be configured by, for example, a locking member such as a hook that locks with a locked portion (not shown) provided on the motor drive device mounting plate 103, a magnet that is attracted to the motor drive device mounting plate 103, or the like. Since the mounting member 21 can be attached and detached, the pad member 2 can be replaced.

The retaining member 22 is provided at the other end 2b (end on the side of the end P2 of the withdrawal path) of the backing member 2. The holding member 22 is used to hold the rolled backing member 2 in the expanded state when the rolled backing member is expanded on the upper surface 11a of the motor drive device main body 11. The holding member 22 may be constituted by, for example, an engaging member such as a hook that engages with an engaged portion (not shown) provided at the end P2 of the drawing path, a magnet that is attracted to the motor drive apparatus main body 11 corresponding to the end P2 of the drawing path, a surface fastener, or the like.

The pad member 2 attached to the motor drive device attachment plate 103 by the attachment member 21 is wound in a roll shape by rolling up the other end portion 2b side toward the attachment member 21, and is disposed at the start end P1 of the withdrawal path. Therefore, the operator unwinds the other end portion 2b side of the underlay member 2 forward, thereby unwinding the underlay member 2 from the start end P1 to the end P2 of the drawing path. This allows the backing member 2 to cover the entire upper surface 11a of the motor drive device body 11.

Next, the replacement operation of the fan motor unit 13 of the motor drive device 1 configured as described above will be described with reference to fig. 3 to 5. Fig. 3 is a side view showing a state in which the motor drive device according to embodiment 1 spreads a roll-shaped pad member. Fig. 4 is a side view showing a state in which the fan motor unit of the motor drive device according to embodiment 1 is replaced. Fig. 5 is a perspective view showing a state in which the fan motor unit of the motor drive device according to embodiment 1 is replaced.

As shown in fig. 3, when replacing the fan motor unit 13, first, the operator unwinds and draws out the other end portion 2b side of the mat member 2 wound in a roll shape at the start end P1 of the drawing path toward the front side, thereby gradually spreading the mat member.

After the backing plate member 2 is completely deployed, the operator hooks and locks the holding member 22 to, for example, the motor drive device main body 11. This allows the pad member 2 to maintain the unfolded state and to maintain the state of covering the entire upper surface 11a of the motor drive device main body 11.

Thereafter, the operator pulls out the front plate 133 of the fan motor unit 13 toward the front. As a result, as shown in fig. 4 and 5, the fan motor unit 13 is drawn forward from the opening 104 along the drawing path toward the terminal P2. At this time, as shown in fig. 4, the contaminant X adhering to the fan motor 131 may fall downward. However, the fallen contaminant X is captured by the backing member 2 spreading along the drawing path of the fan motor unit 13, and thus does not enter the interior of the motor drive apparatus main body 11.

Therefore, according to the motor drive device 1, the interior of the motor drive device main body 11 is not contaminated when the fan motor unit 13 is replaced. Further, since the fan motor unit 13 can be detached by only being drawn out forward from the opening portion 104, the fan motor unit 13 can be easily replaced. After a new fan motor unit is attached through the opening 104, the backing plate member 2 is wound into a roll shape again.

In the present embodiment, the roller-shaped backing member 2 is configured by rolling up the holding member 22 side provided at the other end portion 2b toward the mounting member 21 side. However, although not shown, the roller-shaped backing member 2 may be configured by rolling up the mounting member 21 side toward the holding member 22 side. Thus, the backing plate member 2 can be deployed only by pulling out the holding member 22 forward. In this case, the mounting member 21 side of the backing member 2 is biased in the winding direction by an elastic member such as a spring, and the backing member 2 in the unwound state can be easily returned to the original roller state.

[ 2 nd embodiment ]

Fig. 6 is an enlarged side view of a part of the motor drive device according to embodiment 2. Fig. 7 is an enlarged side view of a roller-shaped pad member of the motor drive device according to embodiment 2. Since the same reference numerals as those of the motor drive device 1 according to embodiment 1 denote the same components, the above description is referred to for explanation of these components, and will not be repeated in the following explanation.

The motor drive device 1A according to embodiment 2 is different from the motor drive device 1 according to embodiment 1 in that the other end 2b of the backing member 2 is detachably attached to the fan motor unit 13.

The one end portion 2a of the backing member 2 in the present embodiment is also attached near the start end P1 of the drawing path. Specifically, the one end 2a of the pad member 2 is fixed to the winding shaft 23 disposed near the start end P1 of the drawing path. Both end portions of the winding shaft 23 are rotatably held between a pair of shaft support plates 24, 24 provided on the motor drive device mounting plate 103 so as to protrude forward. The winding shaft 23 may be detachable from the shaft support plates 24, 24.

The other end 2b of the pad member 2 in the present embodiment has an engagement attachment member 25. The other end 2b of the backing member 2 is detachably attached to the front plate 133 of the fan motor unit 13 by the engagement attachment member 25. The engagement attachment member 25 may be constituted by, for example, an engagement member such as a hook that engages with an engaged portion (not shown) provided on the front plate portion 133, a magnet that is attracted to the front plate portion 133, a surface fastener, or the like.

Next, the replacement operation of the fan motor unit 13 in the motor drive device 1A configured as described above will be described with reference to fig. 8 and 9. Fig. 8 is a side view showing a state in which the fan motor unit of the motor drive device according to embodiment 2 is replaced. Fig. 9 is a side view showing a state in which the fan motor unit of the motor drive device according to embodiment 2 is replaced.

In the present embodiment, when replacing the fan motor unit 13, the operator gradually pulls out the front plate portion 133 of the fan motor unit 13 toward the front as shown in fig. 8.

Since the other end 2b of the backing member 2 is attached to the front plate portion 133 of the fan motor unit 13 by the engagement attachment member 25, when the fan motor unit 13 is drawn out forward, the backing member 2 is unwound by the rotation of the winding shaft 23. Thereby, the other end 2b of the backing member 2 is also gradually drawn out together with the fan motor unit 13. As a result, as shown in fig. 9, the backing member 2 is gradually spread along the drawing path in conjunction with the drawing operation of the fan motor unit 13.

In the process of drawing out the fan motor unit 13 (the process of spreading out the backing plate member 2), as shown in fig. 9, the contaminant X adhering to the fan motor 131 may fall downward. However, the fallen contaminant X is captured by the backing member 2 that is spread out in conjunction with the drawing-out operation of the fan motor unit 13, and therefore does not enter the interior of the motor drive device main body 11.

Therefore, the motor drive device 1A also achieves the same effects as the motor drive device 1 according to embodiment 1. Further, since the backing plate member 2 is expanded in conjunction with the drawing operation of the fan motor unit 13, an operation of expanding the backing plate member 2 before the replacement operation of the fan motor unit 13 is not necessary, and the backing plate member 2 is not forgotten to be expanded.

After the fan motor unit 13 is completely removed, the operator removes the fan motor unit 13 by releasing the engagement between the engagement member 25 and the fan motor unit 13. Then, the pad member 2 is wound into a roll shape by being wound around the winding shaft 23 again. Although not shown, the winding shaft 23 may be biased in the winding direction by an elastic member such as a spring. This allows the backing member 2, from which the engagement with the fan motor unit 13 has been released, to be easily wound around the winding shaft 23.

[ embodiment 3 ]

Fig. 10 is a perspective view of the motor drive device according to embodiment 3. Fig. 11 is an enlarged side view of a part of the motor drive device according to embodiment 3. Since the same reference numerals as those of the motor drive device 1 according to embodiment 1 denote the same components, the above description is referred to for the description of these components, and the description thereof will be omitted.

In the motor drive device 1B according to embodiment 3, the motor drive device main body 11 includes a pair of wall members 111, 111 arranged so as to sandwich the drawing path of the fan motor unit 13 from both sides.

As shown in fig. 10, the wall members 111 and 111 are formed by extending both side surfaces 11b and 11b of the motor drive unit body 11 along the drawing direction of the fan motor unit 13 upward from the upper surface 11 a. Opening 104 of motor drive unit mounting plate 103 is disposed between wall members 111 and 111.

Rail members 112, 112 are provided on inner surfaces 111a, 111a of the pair of panel members 111, respectively. The pair of rail members 112, 112 have the same structure, protrude in a plate shape from the inner surfaces 111a, 111a of the wall members 111, and abut against the lower surfaces of both end portions of the fan motor unit 13 drawn out forward from the opening 104.

As shown in fig. 11, one end portions 112a, 112a (end portions on the side of the start end P1 of the drawing path) of the rail members 112, 112 approach the motor drive device attachment plate 103. The rail members 112 and 112 are formed so as to be spaced upward from the upper surface 11a of the motor drive apparatus main body 11 as they travel from the one end portions 112a and 112a to the other end portions 112b and 112b (end portions on the side of the terminal P2 of the drawing path) disposed forward.

The rail members 112, 112 constitute a drawing path of the fan motor unit 13. Therefore, the fan motor unit 13 drawn forward from the opening 104 is guided along the rail members 112, 112 and gradually separated upward from the upper surface 11a of the motor drive apparatus main body 11. Therefore, the fan motor unit 13 can be easily removed, and the replacement work becomes easier.

In the motor drive device 1B, the backing plate member 2 having the same configuration as that of embodiment 1 is disposed in the vicinity of the start end P1 of the drawing path. Further, a plurality of upper vents 113 are provided in the upper surface 11a of the motor drive main body 11 near the motor drive mounting plate 103.

Next, the replacement operation of the fan motor unit 13 in the motor drive device 1B configured as described above will be described with reference to fig. 12. Fig. 12 is a side view showing a state in which the fan motor unit of the motor drive device according to embodiment 3 is replaced.

When replacing the fan motor unit 13, first, as in embodiment 1, the operator unwinds and draws out the other end portion 2b side of the underlay member 2 toward the front side, thereby spreading the underlay member 2 along the pair of rail members 112 and 112.

When the backing member 2 is completely unfolded, the backing member 2 covers the upper surface 11a of the motor drive apparatus main body 11 along the rail members 112, 112. The holding member 22 of the pad member 2 holds the expanded state of the pad member 2 by being engaged with the other end portions 112b and 112b of the rail members 112 and 112.

Then, the operator draws out the front plate portion 133 of the fan motor unit 13 forward, thereby gradually drawing out the fan motor unit 13 upward from the opening 104 along the drawing path formed by the rail members 112 and 112. In this case, the contaminant X (not shown in fig. 12) falling from the fan motor 131 is also captured by the backing member 2, and therefore does not enter the motor drive apparatus main body 11.

Therefore, also in the motor drive device 1B, the interior of the motor drive device main body 11 is not contaminated when the fan motor unit 13 is replaced. The fan motor unit 13 can be removed upward while being guided by the pair of rail members 112 and 112 only by being drawn forward from the opening 104. Therefore, according to the motor drive device 1B, the fan motor unit 13 can be easily replaced as compared with embodiment 1.

In the motor drive device 1B, the roll-shaped backing member 2 may be the backing member 2 wound around the winding shaft 23 as described in embodiment 2.

[ Another embodiment of the backing plate Member ]

Fig. 13 is a side view showing a pad member according to another embodiment. In fig. 13, illustration of the opening portion 104 and the fan motor unit 13 is omitted.

The pad member 2A has a folded shape. The backing member 2A is folded on the upper surface 11a of the motor drive main body 11 near the motor drive mounting plate 103 and stacked upward.

The backing plate member 2A is attached to the motor drive device attachment plate 103 by an attachment member 21 provided at one end portion 2A. Therefore, the pad member 2A can be deployed by the operator by pulling out the other end 2b of the pad member 2A, as in the pad member 2 shown in embodiment 1. The other end 2b of the backing plate member 2A may be detachably attached to the fan motor unit 13 by an engagement attachment member 25, as in embodiment 2.

Fig. 14 is a side view showing a pad member according to still another embodiment. In fig. 14, illustration of the opening 104 and the fan motor unit 13 is also omitted.

The backing plate member 2B has a corrugated shape. The backing member 2B is folded on the upper surface 11a of the motor drive main body 11 near the motor drive mounting plate 103 and stacked forward.

The backing plate member 2B is attached to the motor drive device attachment plate 103 by an attachment member 21 provided at the one end portion 2 a. Therefore, the pad member 2B can also be deployed by the operator by pulling out the other end 2B of the pad member 2B, as in the pad member 2 shown in embodiment 1. The other end 2B of the backing plate member 2B may be detachably attached to the fan motor unit 13 by an engagement attachment member 25, as in embodiment 2.

The mounting member 21 provided at the one end portion 2A of the pad members 2, 2A, 2B may be mounted on the upper surface 11a of the motor drive apparatus main body 11.

In the above-described embodiment, the fan motor unit 13 is disposed above the radiator 12, but the fan motor unit 13 may be disposed adjacent to the radiator 12. The fan motor unit 13 is disposed adjacent to the radiator 12, which means that the fan motor unit 13 is disposed so as to be able to blow air to the radiator 12. Specifically, the fan motor unit 13 may be disposed above, below, to the side, or to the rear of the radiator 12.

The fan motor unit 13 is not limited to being able to be drawn out so as to pass above the motor drive device main body 11, and may be able to be drawn out so as to pass near the motor drive device main body 11. The fan motor unit 13 is drawn out so as to pass near the motor drive main body 11 means that the fan motor unit 13 is drawn out so as to pass along a drawing path along the outer surface of at least one motor drive main body 11.

The motor drive device body 11 near when the fan motor unit 13 is drawn out is not limited to the motor drive device body 11 to which the fan motor unit 13 is attached, and may be another motor drive device body 11 disposed adjacent to the periphery of the fan motor unit 13. For example, in the case where the fan motor unit 13 is disposed below the radiator 12, when the fan motor unit 13 is drawn out, the contaminant X falling from the fan motor unit 13 falls toward the other motor drive device main body 11 disposed further below the fan motor unit 13. Therefore, by providing the above-described backing plate members 2, 2A, 2B to the other motor drive device main body 11 to which the contaminant X is to fall, the contaminant X can be prevented from entering the other motor drive device main body 11.