JPH11234963A - Motor driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor driving device which can efficiently cool the electric parts of an inverter and the like in a case, even if a member which is to be installed exists on the top face and the back of the casing. SOLUTION: A heat sink 2 where cooling fins 1 extending in a horizontal direction are provided in a row is fitted to an inverter 3 incorporated in a easing 5, and the flow of air for cooling the cooling fins 1 is set to the horizontal direction. Since a means for controlling the flow of air is not necessary to be provided for the top face 5c of the casing 5, the cooling function of a motor driving device can be maintained even if a member which is to be installed exists in the top face 5d of the casing 5. Since the cooling fins 1 extends in the horizontal direction, effective wind sending/cooling can be executed without changing the wind sending route of air which is taken from the side of the casing 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a motor driving device having an inverter.

[0002]

2. Description of the Related Art As a housing structure for cooling an inverter in a motor drive device having a built-in inverter, a structure as shown in FIGS. 2A to 2D is already known. Each of the drawings is a perspective view showing a main part of the housing structure in a see-through manner.

In the case structure shown in FIG. 2A, a heat sink 2 in which a number of cooling fins 1 extending in a vertical direction are arranged in a row is attached to an inverter 3 and hermetically sealed via stays 4 fixed on both sides of the heat sink 2. The inverter 3 is attached to the inner wall of the housing 5 provided in the above-described manner. In the case of such a sealed structure, the cooling effect on the heat sink 2 is not sufficient, and the heat of the heat sink 2 is transferred through the stay 4 via the housing 4. 5 is released to the atmosphere after being transmitted to the housing 5, there is a problem that the housing 5 itself is heated.

In the case structure shown in FIG. 2 (b), a large number of slit-shaped air supply holes 6 are formed on both lower side surfaces and the back surface of the case 5.
And a large number of slit-shaped exhaust holes 7 are drilled in the top surface of the housing 5 to allow air heated by the heat sink 2 inside the housing 5 to escape from the exhaust holes 7 to supply new outside air. Although the air is taken in from the pores 6, the cooling capacity is limited due to natural air cooling using convection.

Both the conventional example shown in FIG. 2 (c) and the conventional example shown in FIG. 2 (d) show a housing structure to which forced air cooling by a fan motor 8 is applied.

In the conventional example shown in FIG. 2C, two fan motors 8 are provided on the top surface of the housing 5 and a duct 9 is provided inside the air supply holes 6 formed in both lower sides of the housing 5. The fan motor 8 sucks the air in the housing 5 to take in fresh air from the air supply hole 6, guides the fresh air to the lower end of the heat sink 2 by the duct 9, and follows the cooling fins 1. 2D, the cooling efficiency of the heat sink 2 is improved, and in the conventional example shown in FIG. The cooling efficiency of the heat sink 2 is improved by blowing the outside air directly along the cooling fins 1 and allowing the outside air to escape from the exhaust holes 7 on the top surface of the housing 5.

However, in any of the configurations shown in FIGS. 2C and 2D, the cooling fins 1 provided on the heat sink 2 are formed so as to extend in the vertical direction. In order to increase the height, air must flow in the housing 5 in the vertical direction along the direction of the cooling fins 1.

As described above, in the conventional example shown in FIG. 2C, the outside air taken in from the air supply holes 6 formed in the lower side of the housing 5 is guided to the lower end of the cooling fin 1 through the duct 9. 2D. In the conventional example shown in FIG. 2D, two fan motors 8 blow outside air directly to the lower back surface of the heat sink 2 so that the air flows upward along the cooling fins 1. In any case, since the air flow is bent from the horizontal direction to the vertical direction in the middle of the path in any case, the loss associated with the air blowing is large, and the air blowing efficiency of the fan motor 8 cannot be sufficiently utilized. There's a problem.

Needless to say, in order to prevent the air flow path from being bent, in the conventional example shown in FIG. 2C, an air supply hole 6 is formed in the bottom surface of the housing 5 or as shown in FIG. It is theoretically possible to mount the fan motor 8 on the bottom surface of the housing 5 in the conventional example, but in practice, the bottom surface of the housing 5 is installed on a mechanical base or floor. , Such a structure has no meaning.

In the case of a motor drive device of an industrial robot, a member such as a robot mechanism may be installed on the top surface or the back surface of the housing 5 of the motor drive device, as shown in FIG. 2 and FIG.
Exhaust hole 7 and fan motor 8 in configuration example (d)
In the housing 5 itself may be difficult.

[0011]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to provide an inverter or the like inside the housing even if there are members to be installed on the top or back surface of the housing. An object of the present invention is to provide a motor drive device capable of efficiently cooling an electric component.

[0012]

According to the present invention, a heat sink having cooling fins extending in a horizontal direction is attached to an inverter of a motor driving device, and the heat sink is located on one side of the cooling fins in a housing of the motor driving device. A fan motor is provided on the side surface to be cooled, the heat sink is cooled by blowing the fan motor along the cooling fin, and the wind is discharged from an exhaust hole provided on the side of the housing located on the other side of the cooling fin. The above object has been attained by a configuration characterized by the following.

Further, a partition plate is provided for securely protecting the weak electric components for the inverter and the control circuit provided in the housing from heat, and a space and a heat sink for mounting the weak electric components for the inverter and the control circuit are mounted. Space for you to split into.

In the case of mounting a heat-generating electric component such as a resistor or a transformer, the heat-generating electric component is mounted near the heat sink so as not to overlap with the blowing direction, and the heat from the fan motor is applied. By cooling together, the other electric parts are also cooled at the same time.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a perspective view showing a configuration of a motor driving device when only an inverter 3 is mounted as a main electric component on a housing 5.

A heat sink 2 having a large number of cooling fins 1 extending in the horizontal direction on the left and right is integrally fixed on the back surface of the inverter 3, and is viewed from one side of the cooling fins 1, that is, from the near side. The wall 5a of the housing 5 located on the right side is provided with two openings vertically separated from each other, and a fan motor 8 for blowing outside air to the cooling fins 1 to cool the cooling fins 1 is attached to each of the openings. I have.

On the other hand, on the other side of the cooling fin 1, that is, on the wall surface 5b of the housing 5 located on the left side when viewed from the near side, the air sent into the housing 5 by the fan motor 8 is released to the outside. A large number of slit-shaped exhaust holes 7 are provided, and the air sent into the housing 5 by the fan motor 8 flows in a horizontal direction by sewing between the cooling fins 1 of the heat sink 2, and the air blowing direction is changed as it is. The air is discharged straight through the exhaust hole 7 without being changed.

Therefore, unlike the conventional motor driving device shown in FIGS. 2C and 2D, the fan motor 8
Since the flow of the air sent in the step (b) is not bent inside the housing 5 and the loss relating to the air blowing is reduced, more effective cooling efficiency can be achieved by the fan motors 8 having the same driving capability.

Further, unlike the conventional motor driving device shown in FIG. 2D, the air fed by the fan motor 8 does not locally hit the back surface of the heat sink 2 and bounces off, so that the cooling fins 1 Since the heat sink 2 flows in the longitudinal direction (left and right) along the surface, the heat sink 2 can be entirely cooled, and the cooling effect on the inverter 3 is further improved.

Since the top surface 5c and the back surface 5d of the housing 5 are not provided with the fan motor 8 and the exhaust hole 7 required for air supply and exhaust, the top surface 5c and the back surface 5d of the housing 5 are provided. A member, such as an industrial robot, to be driven can be arbitrarily fixed to the device.

Further, as shown in FIG.
The partition plate 10 is fixed inside and the space in the housing 5 is divided into two,
If the inverter 3 is mounted in the one closed space 5e and the heat sink 2 is mounted in the other space 5f, the air heated by the heat sink 2 can be prevented from contacting and heating the inverter 3 and at the same time. In addition, it is possible to prevent the inverter 3 from being damaged by intrusion of dust or moisture.

The fan motor 8 and the exhaust hole 7 are provided so as to be opposed to the wall surfaces 5a and 5b on the space 5f side where the heat sink 2 is mounted, and a weak electric component other than the inverter 3 such as an electric control circuit. If there are electric parts such as parts that are difficult to heat, these electric parts are arranged together with the inverter 3 on the side of the closed space 5e.

In addition, electric components which easily generate heat, such as a regenerative discharge resistor 11 provided inside or outside the inverter 3 and a transformer 12 provided outside, are shown in FIG.
As shown in FIG. 2C, these electric components that easily generate heat are mounted in the vicinity of the heat sink 2 so as not to overlap in the air blowing direction. Allow electrical components to cool.

In the embodiment shown in FIG.
By disposing the resistor 11 and the transformer 12 at a position closer to the back than the heat sink 2, the resistor 11 and the transformer 12 block the wind sent from the fan motor 8 to the heat sink 2, or the resistor 11 and the transformer 12 To prevent the heat sent from the fan motor 8 from being blocked by the heat sink 2 and the wind from the fan motor 8.
The number of fan motors 8 provided on the wall surface 5a is increased to four so that the fan motor 8 directly contacts the transformer 1 and the transformer 12, and the number (area) of the exhaust holes 7 provided on the wall surface 5b is correspondingly increased. ing.

Of course, in the embodiment shown in FIG. 2 (c), the partition plate 10 can be provided in the same manner as in the embodiment shown in FIG. 2 (b).

Naturally, in this case, electric components which easily generate heat, such as the resistor 11 and the transformer 12, are disposed together with the heat sink 2 in the space where the fan motor 8 and the exhaust hole 7 are provided, and the inverter 3 and other low current Parts, for example
The electric parts for the control circuit and the like are arranged in the other space.

[0027]

According to the present invention, since the air flow for cooling the heat sink is in the horizontal direction, there is no need to provide a means for controlling the air flow on the top surface of the housing of the motor drive device. Also, a mechanical unit, a base, and the like of a machine to be driven can be freely arranged on the top surface of the housing.

Further, since there is no need to bend the air blowing path required for cooling the heat sink, the air blowing efficiency, that is, the cooling efficiency of the heat sink is improved.

Further, since a partition plate is provided in the housing to divide the space for mounting the weak electric parts for the inverter and the control circuit and the space for mounting the heat sink, the weak electric parts for the inverter and the control circuit are separated. Can be protected from heat.

Further, when mounting electric components such as a resistor and a transformer that generate heat, the electric components are mounted near the heat sink so as not to overlap with the air blowing direction. Other electrical components that are easy to heat with the heat sink can also be cooled at the same time.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating some of the embodiments of the present invention.

FIG. 2 is a perspective view showing a conventional example of a housing structure for cooling an inverter in a motor drive device having a built-in inverter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling fin 2 Heat sink 3 Inverter 4 Stay 5 Case 5a Case wall surface 5b Case wall surface 5c Case top surface 5d Case back surface 5e Space for mounting an inverter 5f Space for mounting a heat sink 6 Air supply hole 7 Exhaust Hole 8 Fan motor 9 Duct 10 Partition plate 11 Resistor 12 Transformer

Claims (3)

[Claims] 1. A heat sink having cooling fins extending in a horizontal direction is attached to an inverter of a motor driving device, and a fan motor is provided on a side surface of the housing of the motor driving device which is located on one side of the cooling fins. A motor drive characterized in that the heat sink is cooled by blowing air with a fan motor along the cooling fins, and the wind is exhausted from an exhaust hole provided on the side of the housing located on the other side of the cooling fins. apparatus. 2. The device according to claim 1, wherein a partition plate is provided in said housing, and divided into a space for mounting a weak electric component for an inverter and a control circuit and a space for mounting said heat sink. Motor drive device. 3. An electric component which generates heat in the vicinity of the heat sink so as not to overlap with the air blowing direction, and cools the electric component which generates heat together with the heat sink by wind from the fan motor. The motor drive device according to claim 1.