JP2016019400A - Power conversion device integrated motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device integrated motor in which a power conversion device side housing per se can be efficiently cooled.SOLUTION: An air stream is generated from the side of a power conversion device side housing 3 to the side of a motor side housing 4 by an external fan 11 attached to a rotary shaft 7 of a motor 2. In that case, since a curved surface end portion 6 protruding to another end side in a rotary shaft direction of the motor 2 is formed in another end portion of the power conversion device side housing 3 in the motor rotary shaft direction, the air stream from the side of the power conversion device side housing 3 to the side of the motor side housing 4 is not especially separated from an outer peripheral surface of the power conversion device side housing 3. Further, a part of a fin 17 for heat radiation formed on an outer peripheral surface of the power conversion device side housing 3 is made extend from the curved surface end portion 6 of the power conversion device side housing 3 to the other end side in the motor rotary shaft direction, and an extension end 18 is set at the same position in the motor rotary shaft direction. Thus, the extension end 18 of the fin 17 is turned down and the power conversion device integrated motor can be erected.SELECTED DRAWING: Figure 1

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.

  As a motor used as a drive source for various devices, a power converter integrated motor including a power converter is known. Patent Document 1 below discloses a power conversion device integrated motor in which an electric motor and a power conversion device are integrated, and an internal fan that rotates with the power of the motor is provided in a casing on the power conversion device side. In this electric power converter integrated motor, an internal fan generates a circulating air flow in the internal space of the electric power converter side casing to cool the wiring board in the electric power converter side casing.

European Patent No. 1419568

By the way, in patent document 1, the heat | fever of the wiring board cooled by the circulation flow in the internal space of a power converter device side housing | casing is eventually transferred to the power converter device side housing. This power conversion device side housing is provided with fins for heat dissipation, but if the temperature of the power conversion device side housing itself is not cooled, how to cool the wiring board with the internal circulation flow However, the cooling in the internal space of the housing naturally has a limit. This problem is because the temperature of the internal space of the power converter side casing is ultimately transferred to the power converter side casing itself regardless of the presence of an internal fan in the power converter side casing. It is important to cool the power converter side housing itself.
The present invention has been made paying attention to the above-described problems, and an object thereof is to provide a power converter integrated motor that can efficiently cool the power converter side housing itself. Is.

  In order to solve the above problem, according to one aspect of the present invention, an electric motor and a power converter integrated motor in which a power converter that converts electric power to the motor is integrally disposed, An electric motor housing that houses the electric motor so that one axial end portion of the rotating shaft protrudes, and an electric power conversion device that is disposed on the other axial end portion side of the rotating shaft of the electric motor and connected to the electric motor housing. A housing for the power converter to be housed, an external fan that is attached to one axial end portion of the rotating shaft of the motor protruding from the housing for the motor and flows air from the power converter side housing to the motor side housing, and power A power converter integrated motor having a curved end formed on the other end side in the axial direction of the rotating shaft of the electric motor and having a curved end protruding to the other end side in the axial direction of the rotating shaft of the electric motor. Is provided.

  According to the electric power converter-integrated electric motor of the present invention, the flow of air from the electric power converter side housing side to the electric motor side housing side is not particularly deviated from the outer peripheral surface of the electric power converter device side housing. The apparatus-side casing can be efficiently cooled.

1 is an external perspective view showing a first embodiment of an electric motor integrated with a power converter according to the present invention. It is a longitudinal cross-sectional view of the electric power converter integrated motor of FIG. It is explanatory drawing of the flow of the air in the outer peripheral part of the electric power converter integrated motor of FIG. It is use explanatory drawing of the electric power converter integrated motor of FIG. It is an external appearance perspective view which shows 2nd Embodiment of the electric power converter integrated motor of this invention. The comparative example of the electric power converter integrated motor of this invention is shown, and it is explanatory drawing of the flow of the air in an outer peripheral part.

  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 which shows the external appearance of the electric power converter integrated motor according to the first embodiment, the electric power converter 1 is arranged on the front side of the figure, and the electric motor 2 is arranged on the back side of the figure, and they are connected in series. Yes. 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 housings 3 and 4 and the lid member 5 are substantially cylindrical, but the tip (bottom plate portion 3a) on the side opposite to the electric motor 2 of the power conversion device side housing 3 has a hemispherical shape as will be described later. It is the curved end 6 of the mold. Moreover, these housing | casing 3 and 4 and the cover member 5 are formed with the metal material excellent in heat conductivity, for example, aluminum die-casting.

  In FIG. 2 which shows the longitudinal cross-section of this electric power converter integrated motor, the rotating shaft 7 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-shaped bottom plate portion 4a is disposed on the right side of FIG. Further, 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 a lid portion 5 a is formed in the center portion in the axial direction. The opening on the left end of FIG. 2 is covered with the lid 5a of the casing connecting member / lid member 5 so that the motor-side casing 4 is sealed. The rotating shaft 7 is rotatably supported by a bearing 8 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 rotating shaft 7 has a right end portion in FIG. 2, that is, one end portion in the axial direction, passes through the bottom plate portion 4 a of the motor-side housing 4 and protrudes to the outside.

  In the motor-side internal space surrounded by the motor-side casing 4 and the casing connecting member / lid member 5, the rotor core 9 is integrally formed on the outer periphery of the rotating shaft 7. A stator core 10 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 7 is rotated by supplying electric power to the stator core 10, for example. Further, for example, by adjusting the power supplied to the stator core 10, the rotation state of the rotating shaft 7 can be adjusted. An external fan for creating an air flow from the power conversion device side housing 3 toward the motor side housing 4 at a location close to the motor side housing 4 in the external projecting portion of the rotating shaft 7. 11 is attached.

  On the other hand, in the power converter side housing 3, the left end portion of FIG. 2, that is, the bottom plate portion 3 a at the other end in the rotation axis direction of the electric motor 2 is a hemispherical curved end portion 6 protruding outward. It is a bottomed cylindrical body, and the opening at the right end in the figure is covered with the lid 5 a of the casing connecting member / lid member 5. Further, an O-ring 12 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. The power converter side internal space surrounded by the power converter side housing 3 and the housing connecting member / lid member 5 accommodates an inverter module 13 that forms the core of the power converter 1. The inverter module 13 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 7 of the electric motor 2. A control part controls the rotation state of the rotating shaft 7 of the electric motor 2, for example by adjusting the electric power supplied to the stator core 10 by the pulse width modulation of the DC voltage converted by the power converter.

  The inverter module 13 is formed on the wiring board 14. The wiring board 14 is formed by forming a wiring pattern on the surface of a board made of a resin such as glass epoxy. The wiring substrate 14 is fixed to a substrate fixing portion 15 formed inside the power conversion device side housing 3 via a fixing tool 16 such as a screw. Various electronic components are mounted on this wiring board. Among these electronic components, there are 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. include. These diode semiconductor devices, electrolytic capacitors, and power semiconductor devices handle a large amount of power and generate a large amount of heat. The heat of the wiring board 14 on which these electronic components are mounted is transferred to the outer peripheral surface of the power conversion device side housing 3 through the internal space of the power conversion device side housing 3. The wiring board 14 may be formed with wiring patterns on both the front and back surfaces. Also, two or more wiring boards 14 can be used in combination.

  As shown in FIG. 1, heat dissipating fins 17 that are long in the axial direction of the rotating shaft 7 of the electric motor 2 are provided on the outer peripheral surface of the power converter side housing 3 and the outer peripheral surface of the electric motor side housing 4. Projecting radially from the outer peripheral surface. These fins 17 are formed integrally with each of the power converter side housing 3 and the motor side housing 4. And among the fins 17 of the power converter side housing 3, the fins 17 that make a pair in the vertical direction and the fins 17 that make a pair in the left and right are, as shown in FIG. That is, it extends to the other end side in the rotation axis direction of the electric motor 2, and the extended end portion 18 is located at the same position in the rotation axis direction of the electric motor 2.

  In the first embodiment, an external fan 11 attached to one axial end portion of the rotating shaft 7 of the electric motor 2 is rotated by the electric motor 2, and the electric fan side is rotated from the power converter side housing 3 side by the rotated external fan 11. An air flow is created on the housing 4 side. The bottom plate portion 3a of the power conversion device side housing 3, that is, the end portion on the other end side of the rotating shaft of the electric motor 2 is an outwardly convex semicircular curved end portion 6, so as shown in FIG. The air flow by the external fan 11 particularly smoothly flows along the outer peripheral surface of the power conversion device side housing 3. Furthermore, since the heat dissipating fins 17 that are long in the direction of the rotation axis of the electric motor 2 protrude from the outer peripheral surface of the electric power converter side housing 3 and the outer peripheral surface of the electric motor side housing 4, the electric power converter side The outer peripheral surface of the housing 3 is actively cooled by the flow of air flowing along the outer peripheral surface itself and the surfaces of the fins 17. As a result, the internal space of the power converter side housing 3 is also cooled, and the wiring board 14 on which the inverter module 13 is formed is also cooled.

  If the bottom plate portion 3a of the power conversion device side housing 3 is a flat surface orthogonal to the rotation axis direction of the electric motor 2 as in the comparative example of FIG. Even so, the air flow collides with the bottom plate portion 3 a of the power conversion device side housing 3, and the air flow itself deviates from the outer peripheral surface of the power conversion device side housing 3. If the air flow deviates from the outer peripheral surface of the power conversion device side housing 3, even if the cooling fins 17 protrude from the outer peripheral surface of the power conversion device side housing 3, the surface of the fin 17 In addition, since the air flow does not flow along the outer peripheral surface of the power conversion device side housing 3, neither the fin 17 nor the outer peripheral surface of the power conversion device side housing 3 is easily cooled. If the outer peripheral surface of the power conversion device side housing 3 is not cooled, the internal space of the power conversion device side housing 3 is not cooled, and the wiring board 14 on which the inverter module 13 is formed is not cooled.

  Further, a part of the cooling fin 17 is extended from the bottom plate portion 3a of the power conversion device side body 3, that is, the hemispherical curved end 6 to the other end of the rotating shaft, and the extended end 18 is connected to the rotating shaft. By setting the same position in the direction, as shown in FIG. 4, the electric power converter integrated motor can be set up with the extended end 18 of the fin 17 facing downward. In the case of the first embodiment, the external fan 11 that creates an air flow from the power converter side casing 3 side to the motor side casing 4 side has an outer diameter of the power converter side casing 3 or the motor side casing. 4 is larger than the outer diameter of the outer peripheral surface of the outer peripheral surface 4, and the outer end of the external fan 11 in the radial direction is likely to come into contact with the electric power converter integrated motor. However, if the power converter integrated motor can be stood with the extended end 18 of the fin 17 facing downward, the power converter integrated motor can be placed in a stable state.

  Thus, in the electric power converter integrated motor of the first embodiment, air flows from the electric power converter side housing 3 side to the electric motor side housing 4 side by the external fan 11 attached to the rotating shaft 7 of the electric motor 2. Occurs. At that time, in the power conversion device side housing 3, the curved end 6 projecting toward the other end of the electric motor 2 in the direction of the rotational axis is formed at the other end of the electric motor 2 in the direction of the rotational axis. The flow of air from the device-side housing 3 side to the motor-side housing 4 side does not deviate from the outer peripheral surface of the power conversion device-side housing 3 in particular, and the power conversion device-side housing 3 is efficiently cooled. be able to.

  Further, a heat dissipating fin 17 is formed on the outer peripheral surface of the power converter side housing 3, and a part of the fin 17 is axially directed from the curved end 6 of the power converter side housing 3 to the rotating shaft 7 of the electric motor 2. The extension end 18 of the extended fin 17 is set to the same position in the axial direction of the rotating shaft 7 of the electric motor 2. Thereby, the power converter integrated motor can be stood with the extended end portion 18 of the fin 17 facing downward, and the power converter integrated motor can be placed in a stable state.

Further, by making the curved end 6 of the power converter side housing 3 hemispherical, the flow of air from the power converter side housing 3 side to the motor side housing 4 side can be smoothly performed. The power conversion device side housing 3 can be cooled more efficiently by flowing on the outer peripheral surface of the body 3.
Furthermore, since the curved end 6 of the power converter side housing 3 is hemispherical, the power converter integrated motor can be stood in a stable state, so that the ease of mounting the inverter module 13 may be impaired. Absent.

  Next, a second 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 according to the second embodiment is similar to the electric power converter integrated electric motor according to the first embodiment, the same reference numerals are used for the same components, and detailed description thereof is omitted. To do. Moreover, since the longitudinal cross-sectional structure of 2nd Embodiment is equivalent to the longitudinal cross-sectional structure of 1st Embodiment, the detailed description is abbreviate | omitted. In this 2nd Embodiment, the radial direction outer side part of the rotating shaft 7 of the electric motor 2 is used for the extension end part 18 of the fin 17 formed in the outer peripheral surface of the power converter device side housing | casing 3. 3 was formed in an arc shape so as to follow the hemispherical curved surface end portion 6. Thereby, it is easy to hold when holding the power converter side housing 3 by hand, such as assembling the power converter integrated motor.

In the first and second embodiments, an internal fan is not provided in the power conversion device side housing 3, but an internal fan is provided in the power conversion device side housing 3 as in the above-described Patent Document 1. There is no problem.
Moreover, the shape of the external fan 11 of the electric power converter integrated motor of the present invention is not limited to the shape of the embodiment. However, in order to create an air flow from the power converter side housing 3 side to the motor side housing 4 side, an external fan 11 having an outer diameter larger than at least the outer peripheral surface of the power converter side housing 3 is required. It is. When the external fan 11 having such a large outer diameter is used, it is difficult to stably place the electric power converter integrated motor, so that a part of the fin 17 is extended from the electric power converter side housing 3. Thus, it is desirable that the electric power converter integrated motor can be placed upright at the extended end portion 18 of the fin 17.

DESCRIPTION OF SYMBOLS 1 Power converter 2 Electric motor 3 Power converter side housing 4 Motor side housing 5 Housing connection member / lid member 6 Curved end 7 Rotating shaft 8 Bearing 9 Rotor core 10 Stator core 11 External fan 12 O-ring 13 Inverter module 14 Wiring Substrate 15 Substrate fixing part 16 Fixing tool 17 Fin 18 Extension end

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;
A motor-side housing that houses the electric motor so that one axial end of the rotating shaft of the electric motor protrudes;
A power conversion device-side housing that is disposed on the other end side in the axial direction of the rotating shaft of the electric motor and connected to the motor-side housing, and houses the power conversion device;
An external fan attached to one axial end of the rotating shaft of the electric motor protruding from the electric motor side housing and for flowing air from the electric power converter side housing side to the electric motor side housing side;
A curved surface end formed on the other end side in the axial direction of the rotating shaft of the electric motor and out of the casing on the power converter side so as to protrude toward the other axial end side of the rotating shaft of the electric motor; An electric motor integrated with a power conversion device, comprising:   At least the fins for heat dissipation are formed on the outer peripheral surface of the power converter side housing, and part or all of the fins are axially other ends of the rotating shaft of the electric motor from the curved end of the power converter side housing The electric power converter integrated motor according to claim 1, wherein the extended end portion of the extended fin and the extended fin is in the same position in the axial direction of the rotating shaft of the electric motor.   The electric power converter integrated motor according to claim 1, wherein the curved end is hemispherical. The extended end portion of the fin is formed in an arc shape so that the radially outer portion of the rotating shaft of the electric motor follows the curved end portion. Power converter integrated motor.

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