JP6067542B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device having an improved cooling structure.

  In a power converter configured to integrate or close the power converter, which is the main heat generating part of the power converter, and the AC motor to be driven, the heat generated by the AC motor is transmitted to the power converter during operation. However, there has been a problem that the cooling specification of the power conversion device becomes stricter than necessary. For this reason, an interface part having fins for heat dissipation is provided between the power converter and the AC motor, and the cooling air is supplied to this interface part by the action of a dedicated cooling fan to convert the heat generated by the AC motor into power conversion. There has been proposed a power conversion device that does not affect the device (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-333382 (page 5-9, FIG. 3)

  The method disclosed in Patent Document 1 requires a dedicated fan for supplying cooling air to the interface portion of the power conversion device and the AC motor, and there is a problem that the structure of the interface portion becomes complicated. The present invention has been made in view of this problem, and an object of the present invention is to provide a power converter that can alleviate the influence of heat generated by an AC motor without adding a cooling fan.

In order to achieve the above object, a power converter of the present invention includes a power converter that inputs a DC voltage or a commercial AC voltage and drives an AC motor , and a housing that houses the power converter is the AC motor. a power conversion device arranged free standing over a plurality of supports on the top surface of an intake port provided in the ceiling plate of the housing, and an exhaust port provided in the bottom plate of the housing, And at least one unit includes a cooling fan disposed in close contact with the air intake port, and the outside air introduced from the air intake port cools the cooling fin for the power converter located below the air intake port. , while being discharged from the exhaust port located further downward, the cooling air discharged from the exhaust port, through the opening formed in the bottom plate and the upper surface of said AC motor of the strut and the casing due to be discharged to the outside Is characterized by cooling an upper surface of said AC motor from above.

  According to the present invention, it is possible to provide a power conversion device that can alleviate the influence of heat generation of an AC motor without adding a cooling fan.

The figure which shows the structure of the power converter device which concerns on Example 1 of this invention. The single wire connection diagram of the power converter device which concerns on Example 1 of this invention. The figure which shows the structure of the power converter device which concerns on Example 2 of this invention. The figure which shows the structure of the power converter device which concerns on Example 3 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  Hereinafter, the power converter concerning Example 1 of the present invention is explained with reference to FIG.1 and FIG.2. In FIG. 1, the power conversion device 1 is disposed close to the AC motor 2. Specifically, the power conversion device 1 is disposed on the upper surface (ceiling portion) of the AC motor 2 so as to be independent through the support columns 3A and 3B. In FIG. 1, the upper surface of the AC motor 2 is a flat surface, and the pillars 3A and 3B, as well as the bottom of the four corners of the power converter 1 of the box-type casing, are not shown on the back of the pillars 3A and 3B. It is assumed that there are two columns. In FIG. 1, an external cable and a wiring cable from the power converter 1 to the AC motor 2 are not shown.

  A single-line diagram of the power converter 1 and the AC motor 2 is shown in FIG. When a DC voltage is applied to the power converter 11 in the power converter 1, the power converter 11 converts the direct current into alternating current to drive the alternating current motor 2. Although FIG. 2 shows the case where a direct current is supplied to the power converter 1, a commercial alternating voltage may be applied. In this case, the power converter 11 is a converter that performs AC-DC conversion + an inverter that performs orthogonal conversion, or a cycloconverter or matrix converter that performs AC-AC conversion. The AC motor 2 may be three-phase or multiphase exceeding it. The number of output phases of the power converter 11 is determined according to the number of phases of the AC motor 2.

  In FIG. 1, a power converter 11 is attached in the casing of the power converter 1. The power converter 11 is the part that generates the most heat in the power converter 1. Cooling fans 10 </ b> A and 10 </ b> B are attached to the ceiling portion of the casing of the power conversion device 1, and the cooling air flowing from the air inlet 12 provided on the ceiling plate of the casing is directed toward the power converter 11 positioned below. The power converter 11 is cooled by flowing. Specifically, cooling fins provided in close contact with the power semiconductor elements constituting the power converter 11 are cooled. The cooling air passes through the exhaust port 13 provided in the bottom plate of the lower part of the casing of the power converter 1, and is formed by the columns 3A, 3B, etc., the upper surface of the AC motor 2, and the lower part of the casing of the power converter 1. From the four openings. In FIG. 1, the path of the cooling air is indicated by a solid arrow. The two arrows indicate the cooling air discharged from the opening at the rear of the support 3A, that is, the opening at the lower right side of the power converter 1, and the opening at the rear of the support 3B, that is, the left side of the power converter 1. Although two paths of cooling air discharged from the lower opening are shown, it is apparent from the above description that there is cooling air (not shown) that passes through the opening at the lower front and lower rear of the power conversion device 1. The illustrated opening 4 is an opening in the lower part of the front surface of the power conversion device 1.

  As described above, the cooling air flowing from the upper part of the casing of the power conversion device 1 to the lower part of the casing of the power conversion device 1 is cooled by the action of the cooling fans 10A and 10B, and the cooling wind discharged from the exhaust port 13 is Since the cooling air passing through the opening cools the upper surface of the AC motor 2 by adopting a structure that passes through the opening between the support columns at the lower part of the casing of the power conversion device 1 and discharges it to the outside, It becomes possible to reduce the influence of the heat generated by the AC motor 2 on the power converter 1 without adding a cooling fan. In addition, since the cooling air is obtained from the upper part of the casing of the power conversion device 1 and vented toward the lower part where the temperature is higher, the power converter 11 can be cooled more efficiently. It becomes possible.

  FIG. 3 is a diagram illustrating the configuration of the power conversion apparatus according to the second embodiment of the present invention. In each part of the second embodiment, the same parts as those in the figure showing the configuration of the power conversion apparatus according to the first embodiment of the present invention in FIG. The second embodiment is different from the first embodiment in that the cooling fins 5 are provided on the upper surface of the AC motor 2.

  FIG. 3 illustrates an example in which the cooling fins 5 are provided in the vicinity of the opening 4 in the lower front portion of the power conversion device 1 among the openings between the support columns at the lower portion of the casing of the power conversion device 1. Since there are four openings between the support columns at the lower part of the casing of the power converter 1, it is obvious that cooling fins may be provided near other openings.

  According to the second embodiment of the present invention, the cooling efficiency is improved by the heat of the upper surface of the AC motor 2 being taken away by the cooling air via the cooling fins 5. Accordingly, it is possible to further reduce the influence of the heat generated by the AC motor 2 on the power conversion device 1.

  FIG. 4 is a diagram illustrating the configuration of the power conversion apparatus according to the third embodiment of the present invention. In each part of the third embodiment, the same parts as those in the diagram illustrating the configuration of the power conversion device according to the first embodiment of the present invention in FIG. The third embodiment is different from the first embodiment in that the AC motor 2 has a water-cooled cooling structure, and the cooling water is also passed through the power converter 1.

  In FIG. 4, the cooling water is taken into the AC motor 2 from the external pipe connected to the intake flange 22, and the upper surface of the AC motor 2 is passed through the cooling water pipe 24 in the AC motor 2, for example, in the column 3B. It connects with the cooling water piping 14 in the power converter device 1 via. And the piping which cooled the inside of the power converter device 1 with the cooling water piping 14 passes through the upper surface of the alternating current motor 2 again, for example via the support | pillar 3A, and is guide | induced into the alternating current motor 2, The inside of the alternating current motor 2 which is not shown in figure Water is drained from the external pipe connected to the drainage flange 23 via the cooling water pipe.

  According to the third embodiment of the present invention as described above, even if the upper surface of the AC motor 2 becomes high temperature and the influence reaches the lower part of the casing of the power converter 1, the heat of that portion is supplied to the cooling water pipe. Therefore, the influence of the heat generated by the AC motor 2 on the power converter 1 can be further reduced.

  Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

For example, it has been described that there are four pillars supporting the casing of the power conversion device 1 in each corner at the bottom of the casing.
Any structure that stably supports the housing of the power conversion device 1 with two or more can be used. For example, in the case of two, a rectangular column having a horizontally long cross section may be used, and the cooling air may be discharged to the outside air from an opening between two columns.

  Although the cooling fans 10A and 10B have been described as two units, they may be one unit or three or more units. In addition, the cooling fans 10A and 10B in FIG. 1 are attached to the ceiling of the casing of the power converter 1 in close contact with the air inlet 12. However, the cooling fans 10A and 10B are not necessarily provided at this position, and external air is introduced from the air inlet 12. The power converter 11 may be cooled and the cooling air flow may be obtained so that the cooling air is discharged from the exhaust port 13. For example, it may be provided in the lower part of the power converter 11, and a cooling fan may be arranged at a plurality of positions in order to realize the above flow more reliably.

  Furthermore, although the upper surface of the AC motor 2 has been described as being a flat surface, it is not necessarily required to be a flat surface. It is only necessary that the power conversion device 1 is stably supported by the columns and that the cooling air is discharged from the openings between the columns. For example, even if the upper surface of the AC motor 2 is a cylindrical surface, the present invention can be applied if the above condition is satisfied.

DESCRIPTION OF SYMBOLS 1 Power converter 2 AC motor 3A, 3B Prop 4 Cooling fin 10A, 10B Cooling fan 11 Power converter 12 Inlet 13 Exhaust 14 Cooling water piping 22 Intake flange 23 Drain flange 24 Cooling water piping

Claims (3)

Provided with a DC voltage or a commercial AC voltage as input, and provided with a power converter for driving the AC motor, a housing for storing the power converter is arranged on the upper surface of the AC motor in a self-supporting manner via a plurality of columns . A power converter,
An intake port provided in the ceiling plate of the housing,
An exhaust port provided in the bottom plate of the housing,
And at least one of the cooling fans is disposed in close proximity to the air inlet ,
The outside air introduced from the intake port is cooled from the cooling port for the power converter located below the intake port, and is then discharged from the exhaust port located further below and from the exhaust port. cooling air, and characterized by cooling an upper surface of said AC motor from above by being discharged to the outside through the opening formed in the bottom plate and the upper surface of said AC motor of the strut and the casing Power converter. The power converter according to claim 1, wherein at least one cooling fin is attached to an upper surface of the AC motor so that cooling air passing through the opening takes heat. The power converter according to claim 1 or 2, wherein the AC motor is a water-cooled type, and a part of a cooling water pipe is guided into the housing to cool the inside of the housing.

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