JP6398400B2 - Electric motor with integrated power converter - Google Patents

Description

  The present invention relates to a power converter integrated motor in which a power converter is integrally attached to an electric motor, and is suitable, for example, when the power converter is arranged in the axial direction of a rotating shaft of the motor.

  2. Description of the Related Art As an electric motor used as a drive source for various devices, an electric conversion device-integrated electric motor integrally provided with a power conversion device is known. As such an electric power converter integrated motor, there is one described in Patent Document 1 below, for example. In this electric power converter integrated motor, an electric motor housing that houses the electric motor and an electric power converter housing that houses the electric power converter are connected to each other, and an internal fan that is rotated by the electric motor is arranged at the connecting portion between them. ing. By this internal fan, outside air is sucked into the inside of the power converter side housing, passes through the internal space of the power converter side housing, reaches the internal fan, and is discharged to the outside from the outer peripheral wall of the internal fan. Thereby, the power converter in the internal space of the power converter side housing is cooled.

JP 2009-124829 A

By the way, in patent document 1, the internal fan is arrange | positioned in the space between the partition plate which partitions off a power converter device side housing | casing, and the sealing board which seals an electric motor side housing | casing. However, an opening for sucking outside air inside the power conversion device side housing and an opening for sucking air that has passed through the internal space of the power conversion device side housing to the internal fan side are provided. The power converter side housing is not sealed. If the casing of the power conversion device is not sealed, the internal wiring board cannot be protected against dust and water. On the other hand, it is easy to hermetically seal the power conversion device side housing. However, by doing so, even if an internal fan is provided, outside air is not sucked into the power conversion device side housing, and the power conversion device side housing Since the air in the interior space is not discharged to the outside, the cooling efficiency of the power conversion device is lowered.
The present invention has been made paying attention to the above-described problems, and provides a power converter integrated motor that can improve the cooling efficiency of the power converter while sealing the power converter side housing. It is intended to provide.

To achieve the above object, according to one aspect of the present invention, there is provided a power converter integrated motor in which an electric motor and a power converter that converts electric power to the electric motor are integrally disposed, An electric motor housing that houses an electric motor, an electric power converter housing that is connected to the electric motor housing and houses the electric power converter, and the electric motor housing and the electric power converter housing are connected to each other. a connecting portion, and the double sealing plate structure sealing plate for sealing the each of the formed in the connecting portion and the motor-side casing and said power conversion apparatus housing has a double structure, the two A pair of communication holes formed in the connecting portion between the sealing plates of a heavy structure and communicating between the outside of the connecting portion and the sealing plate of the double structure facing the radial direction of the rotating shaft of the electric motor; The connecting portion includes two pairs of the communication portions. Power converter integrated motor having one plurality of internal fins formed along the radial direction of the motor rotation shaft so as to be in contact with the flow of natural convection generated to the other side from the side of the hole Provided.

  According to the electric power converter integrated motor of the present invention, the power converter side housing and the electric motor side housing are sealed by the double-sealed sealing plate having a double sealed plate structure, and the communication hole is vertically arranged. The natural convection which arises by being located arises between the sealing plates of a double structure, and the cooling efficiency of a power converter device improves.

It is a longitudinal section showing a 1st embodiment of a power converter integrated motor of the present invention. It is a longitudinal cross-sectional view of the housing connection member / lid member of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the electric power converter integrated motor of this invention. FIG. 4 is a cross-sectional view of the casing connecting member / lid member of FIG. 3. It is a cross-sectional view of the housing connection member / lid member showing the third embodiment of the electric power converter integrated motor of the present invention. It is a longitudinal cross-sectional view which shows the comparative example of the electric power converter integrated motor of this invention. FIG. 7 is a cross-sectional view of the casing connecting member / lid member of FIG. 6.

  Hereinafter, a first embodiment of an electric motor integrated with a power converter according to the present invention will be described with reference to the drawings. In FIG. 1 showing a longitudinal section of the electric power converter integrated motor according to the first embodiment, the electric power converter 1 is arranged on the left side of the figure, and the electric motor 2 is arranged on the right side of the figure, and they are connected in series. . Among these, the power conversion device 1 is housed in the power conversion device side housing 3, the motor 2 is housed in the motor side housing 4, and the power conversion device side housing 3 and the motor side housing 4 are housing connection members. It is connected via the cum lid member 5. The casings 3 and 4 and the lid member 5 are approximately cylindrical and are formed of a metal material having excellent thermal conductivity, for example, aluminum die casting.

  In this electric power converter integrated motor, the rotating shaft 6 of the electric motor 2 is arranged in the left-right direction in the figure. The motor-side housing 4 is a bottomed cylindrical body in which a disk-like bottom plate portion 4a is disposed on the right side of FIG. The casing connecting member / lid member 5 is a cylindrical body having the same outer diameter as that of the motor-side casing 4, and two sealing plates 5 i and 5 m are formed in a double structure at the center in the axial direction. Yes. The double sealing plates 5i, 5m are arranged in parallel so as to seal the inside of the housing connecting member / lid member 5 in the axial direction, and the left side of FIG. 1 is the power converter side sealing plate 5i, FIG. The right side of 1 is the motor side sealing plate 5m. The opening at the left end of FIG. 1 is covered with the motor-side sealing plate 5m of the casing connecting member / lid member 5 so that the motor-side casing 4 is sealed. The rotating shaft 6 is rotatably supported by a bearing 7 press-fitted into the central portion of the bottom plate portion 4 a of the motor-side housing 4 and the central portion of the lid portion 5 a of the housing connecting member / lid member 5. The rotary shaft 6 has a right end in FIG. 1, that is, one end in the axial direction, protrudes outside through the bottom plate portion 4a of the motor-side casing 4, and outputs are taken out therefrom.

  In the motor-side internal space surrounded by the motor-side casing 4 and the casing connecting member / lid member 5, the rotor core 8 is integrally formed on the outer periphery of the rotating shaft 6. A stator core 9 fixed to the side housing 4 is formed. Thereby, the electric motor 2 is comprised in the electric motor side housing | casing 4, and the rotating shaft 6 is rotated by supplying electric power to the stator core 9, for example. Further, for example, by adjusting the power supplied to the stator core 9, the rotation state of the rotating shaft 6 can be adjusted. A large number of heat dissipating fins 17 are formed on the outer side of the peripheral wall 4b of the motor-side casing 4.

  On the other hand, the power conversion device side housing 3 is a bottomed cylindrical body in which a disc-shaped bottom plate portion 3a is disposed on the left side of FIG. 1, and an opening at the right end in the drawing is a housing connecting member / lid. The member 5 is covered with a power converter side sealing plate 5i. Further, an O-ring 10 is interposed between the peripheral wall portion 3b of the power conversion device side housing 3 and the peripheral wall portion 5b of the housing connecting member / lid member 5, whereby the power conversion device side housing 3 is sealed. Yes. An inverter module 11 that forms the core of the power conversion device 1 is housed in the internal space on the power conversion device side surrounded by the power conversion device side housing 3 and the housing connecting member / lid member 5. The inverter module 11 includes, for example, a power conversion unit that converts AC voltage into DC voltage, and a control unit that controls the rotation state of the rotating shaft of the electric motor. The control unit controls the rotation state of the rotating shaft 6 of the electric motor 2 by adjusting the power supplied to the stator core 9 by, for example, pulse width modulation of the DC voltage converted by the power conversion unit.

  The inverter module 11 is formed on the mounting substrate 12. The mounting substrate 12 is obtained by forming a wiring pattern on the surface of a substrate made of a resin such as glass epoxy. The mounting substrate 12 is fixed to a substrate fixing portion 13 formed inside the power conversion device side housing 3 via a fixing tool 14 such as a screw. Various electronic components are mounted on the mounting substrate 12. Among these electronic components, a semiconductor device for a diode necessary for a power conversion unit, an electrolytic capacitor, a power semiconductor device necessary for a control unit, and the like. Is also included. For example, heat generated due to loss of electronic components is transferred from the internal space of the power converter side housing 3 to the power converter side housing 3 and the power converter side sealing plate 5i. The mounting substrate 12 may be formed with wiring patterns on both the front and back surfaces. Also, two or more mounting boards 12 can be used in combination. A large number of heat radiation fins 17 are also formed on the outside of the peripheral wall portion 3b and the bottom plate portion 3a of the power conversion device side housing 3.

  As described above, the casing connecting member / lid member 5 constituting the connecting portion between the power converter side casing 3 and the motor side casing 4 includes the power converter side sealing plate 5i and the motor side sealing plate 5m. A sheet of sealing plates is formed in a double structure, forming a double sealing plate structure. Between the two sealing plates 5i and 5m, the outer wall of the casing connecting member / lid member 5 and the double-layered sealing plates 5i, 5m A communication hole 15 that communicates with each other is formed. FIG. 2 is a longitudinal cross-sectional view of the casing connecting member / lid member 5 cut at the portion of the communication hole 15. As is apparent from FIG. The communication holes 15 communicating between the sealing plates 5i and 5m are formed in pairs so as to face the radial direction of the rotating shaft 6 of the electric motor 2. Therefore, as shown in FIG. 1, by arranging the electric power converter integrated motor so that the two pairs of communication holes 15 are arranged vertically, the natural convection in the vertical direction is generated from the lower communication hole 15 by two sheets. Flows between the sealing plates 5i and 5m, and flows out from the upper communication hole 15 to the outside. Since the two sealing plates 5i and 5m are cooled by this natural convection, the internal space of the power converter side housing 3 and the internal space of the motor side housing 4 are cooled.

  FIG. 6 is a longitudinal sectional view of a power converter integrated motor having only one sealing plate 5a as a comparative example of the first embodiment, for example, and FIG. 7 is a longitudinal section of the casing connecting member / lid member 5 FIG. That is, in this comparative example, the single sealing plate 5 a plays a role of sealing the opening of the power conversion device side housing 3 and a role of sealing the opening of the motor side housing 4. Even in this comparative example, both the power converter side housing 3 and the motor side housing 4 can be sealed with a single sealing plate 5a, but there is no gap between them, so the sealing plate 5a must be cooled. I can't. For this reason, neither the internal space of the power converter side housing 3 nor the internal space of the motor side housing 4 can be cooled via the sealing plate 5a.

  As described above, in the electric power converter integrated motor according to the first embodiment, the electric power converter side casing 3 and the electric motor side are provided by the double-structured sealing plates 5i and 5m formed on the casing connecting member and the lid member 5. Each of the housings 4 can be sealed. Further, the communication hole 15 facing the radial direction of the rotating shaft 6 of the electric motor 2 is formed in the casing connecting member / lid member 5 between the double-structured sealing plates 5i and 5m, so that the communication hole 15 is formed in the vertical direction. The natural convection generated by being located between the two sealing plates 5i and 5m is cooled, and as a result, the power converter side sealing plate 5i and the motor side sealing plate 5m are cooled, and the cooling efficiency of the power converter 1 is improved. improves.

  Next, a second embodiment of the electric power converter integrated motor according to the present invention will be described with reference to FIGS. Since the electric power converter integrated motor according to the second embodiment is similar to the electric power converter integrated electric motor according to the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. To do. In FIG. 3 showing a longitudinal section of the electric power converter integrated motor according to the second embodiment, a large number of internal fins 16 for heat dissipation are formed between the electric power converter side sealing plate 5i and the electric motor side sealing plate 5m. As shown in FIG. 4, the internal fins 16 are formed along the radial direction of the rotating shaft 6 of the electric motor 2 in which two communication holes 15 forming a pair are formed. The internal fins 16 are formed so as to connect the power converter side sealing plate 5i and the motor side sealing plate 5m. That is, the internal fins 16 are formed so as to be joined to the power converter side sealing plate 5i and the motor side sealing plate 5m.

  In this embodiment, similarly to the first embodiment, the electric power converter integrated motor is arranged so that the two pairs of communication holes 15 are vertically arranged, so that the natural convection in the vertical direction is generated from the lower communication holes 15. It flows between the two sealing plates 5i and 5m, and flows out from the upper communication hole 15 to the outside. At this time, the heat dissipating internal fins 16 are formed along the radial direction of the motor rotating shaft in which the two communicating holes 15 forming a pair are formed, that is, formed along the direction of natural convection. By this natural convection, the internal fin 16 is cooled, and the two sealing plates 5i and 5m connected to the internal fin 16 are cooled, so that the internal space of the power conversion device side housing 3 and the motor side housing are cooled. The internal space of the body 4 is cooled more efficiently.

  As described above, in the electric power converter integrated motor according to the second embodiment, in addition to the effects of the first embodiment, the internal fins 16 that can ventilate air from one side to the other side of the opposing communication hole 15 are provided. It is formed on the body connecting member / lid member 5, and the internal fins 16 are joined to both the power converter side sealing plate 5 i and the motor side sealing plate 5 m, so that the internal space of the power converter side housing 3 and The internal space of the motor side housing 4 is cooled more efficiently, and the cooling efficiency of the power conversion device 1 is further improved.

  Next, a third embodiment of the electric power converter integrated motor according to the present invention will be described with reference to FIG. Since the electric power converter integrated motor of the third embodiment is similar to the electric power converter integrated electric motor of the second embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. To do. Also in the electric power converter integrated motor of the third embodiment, a large number of internal fins 16 for heat dissipation are formed between the electric power converter side sealing plate 5i and the electric motor side sealing plate 5m, as in the second embodiment. . As shown in FIG. 5, the internal fins 16 are formed so as to be connected to the power communication device side sealing plate 5i and the motor side sealing plate 5m so as to communicate with the two communication holes 15 forming a pair. Yes.

  In this embodiment, the internal fins 16 are curved so as to protrude outward in the rotational axis radial direction of the electric motor 2 at an intermediate position between the two communicating holes 15 facing each other. In addition, the curvature radius of the internal fin 16 is larger as it is formed on the inner side in the radial direction of the electric motor 2. Accordingly, by arranging the electric power converter integrated motor so that the two pairs of communication holes 15 are vertically arranged, the natural convection in the vertical direction is transferred from the lower communication hole 15 to the two sealing plates 5i, 5m. Flows through the internal fins 16 and flows out from the upper communication hole 15 to the outside. At this time, the inner fin 16 is curved so that the intermediate portion of the inner fin 16 protrudes outward in the rotational axis radial direction of the electric motor 2 and the curvature radius is increased toward the inner fin 16 in the inner radial direction of the electric motor 2. Air passing between the internal fins 16 cools a wider range of the power converter side sealing plate 5i and the motor side sealing plate 5m, so that the internal space of the power converter side housing 3 and the motor side housing 4 are cooled. The internal space is more efficiently cooled, and the cooling efficiency of the power conversion device 1 is further improved.

In addition, in each embodiment, although what demonstrated only one pair of two communication holes 15 was demonstrated, two or more pairs of communication holes 15 may be formed.
Further, in the previous embodiment, the double sealing plate structure of the present invention is configured by the casing connecting member / lid member 5, but the aspect of the double sealing plate structure of the present invention is not limited to this. . For example, in the previous embodiment, the power conversion device side housing 3 that houses the power conversion device 1 and the motor side housing 4 that houses the motor 2 are separated from each other, and these are connected by the housing connecting member / lid member 5. Although it was set as the structure connected, the integral structure where the electric motor side housing | casing and the power converter device side housing | casing were connected by the connection part of the double sealing board structure may be sufficient. In that case, the sealing plate that seals the power conversion device side end of the motor side housing and the sealing plate that seals the motor side end of the power conversion device side housing are connected in advance to the connecting portion of the housing member having an integral structure. It can also be formed. That is, the electric power converter integrated motor of the present invention can be configured by individually assembling the electric motor and the power converter from both axial ends of the cylindrical member having a double bottom plate structure in the axial intermediate portion.

DESCRIPTION OF SYMBOLS 1 Power converter device 2 Electric motor 3 Power converter device side housing | casing 4 Electric motor side housing | casing 5 Case connection member and cover member (connection part)
5m Motor side sealing plate 5i Power conversion device side sealing plate 6 Rotating shaft 7 Bearing 8 Rotor core 9 Stator core 10 O-ring 11 Inverter module 12 Mounting substrate 13 Substrate fixing portion 14 Fixing tool 15 Communication hole 16 Internal fin 17 Fin

Claims (4)

A power converter integrated motor in which an electric motor and a power converter that converts electric power to the electric motor are integrally disposed;
An electric motor side housing for storing the electric motor;
A power converter side housing connected to the motor side housing and housing the power converter;
A sealing plate that includes a connecting portion that connects the motor-side housing and the power converter device-side housing, and that is formed in the connecting portion and seals each of the motor-side housing and the power converter device-side housing; A double sealed plate structure which is a double structure;
A pair of two connections formed in the connecting portion between the sealing plates of the double structure and communicating between the outside of the connecting portion and the sealing plate of the double structure facing the radial direction of the rotating shaft of the electric motor A hole, and
The connecting portion is formed of a plurality of lines formed along the radial direction of the rotating shaft of the electric motor so as to be able to contact a natural convection flow generated from one side to the other side of the pair of communication holes. An electric motor integrated with a power converter, characterized by having an internal fin . The electric power converter integrated motor according to claim 1, wherein the internal fin is joined to at least one of the double-structured sealing plates . The inner fins, according to claim 1 or 2, characterized in that at an intermediate position of the two opposing pairs of the communication hole is curved to be convex radially outward of the rotating shaft of the electric motor Power converter integrated motor. The electric power converter integrated motor according to claim 3 , wherein the inner fin has a larger radius of curvature as it is formed on a radially inner side of a rotating shaft of the electric motor.

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