JP2021158860A - Rotary electric machine device - Google Patents

Abstract

To provide a rotary electric machine device which comprises a housing for housing a motor and a casing attached to the housing, and can reduce abnormal noise that may occur in the casing.SOLUTION: A rotary electric machine device comprises: a housing that houses a motor; an inverter that is attached to the housing and is connected to the motor; and a casing attached to the housing in a manner covering the inverter. An opening for performing work for attaching a component to the inverter is formed in the casing. The casing includes; a plurality of fixing portions for fixing the casing to the housing; and a plurality of screw holes disposed around the opening and for fastening a lid portion for closing the opening. The plurality of fixing portions includes a pair of fixing portions that are provided on one side wall of the casing and the other side wall opposite to the one side wall and face each other. The plurality of screw holes is disposed in a region, in the casing, interposed between the pair of fixing portions in a plan view.SELECTED DRAWING: Figure 5

Description

The present invention relates to a rotary electric machine.

Patent Document 1 discloses a rotary electric device including a housing for accommodating a motor, an inverter to which the housing is attached and connected to the motor, and a housing to be attached to the housing so as to cover the inverter.

International Publication No. 2016/199219

However, in the rotary electric device shown in Patent Document 1, the vibration from the motor, which is the vibration source, propagates to the housing, and abnormal noise may be generated in the housing.

Therefore, an object of the present invention is to provide a rotary electric device that reduces abnormal noise that may occur in a housing attached to a housing that houses a motor.

The rotary electric machine according to one aspect of the present invention includes a housing for accommodating the rotary electric machine, a power conversion device attached to the housing and connected to the rotary electric machine, and a housing attached to the housing so as to cover the power conversion device. It is a rotary electric machine including. The housing is formed with openings for attaching parts to the power conversion device, and is arranged around the openings and a plurality of fixing portions for fixing the housing to the housing. A plurality of fastening portions for fastening the lid portion for closing the opening portion, and the plurality of fixing portions are provided on one side wall of the housing and the other side wall facing the one side wall. A plurality of fastening portions are arranged in a region sandwiched between the pair of fixing portions in the housing in a plan view, including a pair of fixing portions facing each other.

In the above embodiment, the fixed portion is the portion where the vibration first propagates from the housing (motor), but the rigidity of the region sandwiched between the pair of fixed portions in the housing in a plan view is improved by the fastening portion. It is possible to reduce abnormal noise that may occur in the housing (particularly the top plate).

FIG. 1 is a perspective view of the rotary electric machine of the present embodiment. FIG. 2 is a perspective view of the rotary electric machine of the present embodiment (a perspective view of FIG. 1 rotated by about 90 degrees in the XY plane). FIG. 3 is a perspective view of a housing constituting the rotary electric device of the present embodiment. FIG. 4 is a schematic view of an inverter constituting the rotary electric machine of the present embodiment. FIG. 5 is a plan view of a housing constituting the rotary electric device of the present embodiment. FIG. 6 is a bottom view of a housing constituting the rotary electric device of the present embodiment. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a cross-sectional view taken along the line BB of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Basic configuration of this embodiment]
FIG. 1 is a perspective view of the rotary electric machine device 100 of the present embodiment. FIG. 2 is a perspective view of the rotary electric machine 100 of the present embodiment (the perspective view of FIG. 1 is rotated by about 90 degrees in the XY plane). FIG. 3 is a perspective view of a housing 3 constituting the rotary electric machine device 100 of the present embodiment. In the figure, the X-axis, Y-axis, and Z-axis are assumed to be orthogonal to each other.

As shown in FIGS. 1 and 2, the rotary electric device 100 includes a housing 1 for accommodating a three-phase AC motor (rotary electric machine, not shown) and an inverter 2 (power conversion device, FIG. 4) attached to the housing 1. (See) and a box-shaped housing 3 attached to the housing 1 so as to cover the inverter 2, and has a mechanical and electrical integrated structure.

The housing 1 houses the motor (not shown) as described above, but the rotor shaft 9 constituting the motor (not shown) is exposed from the housing 1. As shown in the figure, the rotor shaft 9 has an X-axis direction as an axial direction.

As shown in FIGS. 1 to 3, the housing 3 is formed of, for example, metal, has a rectangular box shape with the X-axis direction as the long side direction and the Y-axis direction as the short side direction, and has a -Z shape. The axial end is open (see FIG. 6). Further, the housing 3 is fixed to the housing 1 by the fastening bolts 6.

Fixing portions 31 (fixing portions 31A, 31B, 31C, 31D) are arranged on the side wall on the −Y axis side (long side) and the side wall on the + Y axis side (long side) of the housing 3, respectively. The fixed portion 31A is arranged at a position deviated from the center to the + X axis side on the side wall on the -Y axis side (long side), and the fixed portion 31B is arranged on the side wall on the -Y axis side (long side) from the center to the -X axis. It is placed in a position that is biased to the side. The fixed portion 31C is arranged at a position deviated from the center to the + X-axis side on the side wall on the + Y-axis side (long side), and the fixed portion 31D is arranged from the center to the -X-axis side on the side wall on the + Y-axis side (long side). It is placed in a biased position.

Further, the fixed portion 31A and the fixed portion 31C face each other in the Y-axis direction with the housing 3 interposed therebetween, and the fixed portion 31B and the fixed portion 31D face each other in the Y-axis direction with the housing 3 interposed therebetween. The fixing portions 31A and 31C may be arranged at the + X-axis direction end of the side wall of the housing 3, and the fixing portions 31B and 31D may be arranged at the −X-axis direction end of the side wall of the housing 3. You may.

The fixing portion 31 (fixing portion 31A, 31B, 31C, 31D) includes a protruding portion 311 (see FIG. 3) and a rib portion 313. The projecting portion 311 is a member extending in the Y-axis direction from the end portion of the side wall of the housing 3 in the −Z-axis direction, and in the central portion thereof, an insertion hole 312 (see FIG. 5 and the like) through which the fastening bolt 6 is inserted. ) Is placed.

The rib portions 313 are formed to increase the rigidity between the protrusion 311 and the side wall of the housing 3, and are arranged in pairs with respect to, for example, the protrusion 311.

The rib portion 313 is a side wall of the housing 3, and extends in the Y-axis direction from a position where the protrusion 311 is sandwiched from the X-axis direction in a plan view, and the end portion in the −Z-axis direction is connected to the protrusion 311. There is. The rib portion 313 is a member that extends in the Z-axis direction, but has a tapered shape in which the length extending in the Y-axis direction becomes shorter toward the + Z-axis direction.

Insertion holes 32A and 32B are formed on the side wall of the housing 3 on the + X axis side. A bus bar 4N (see FIG. 4) connected to the inverter 2 is inserted into the insertion hole 32A, and a bus bar 4P (see FIG. 4) connected to the inverter 2 is inserted into the insertion hole 32B.

On the upper part (top plate) of the housing 3, a first top plate portion 33 adjacent to the insertion holes 32A and 32B and a second top plate portion arranged on the −X axis direction side from the first top plate portion 33 38 are arranged. Two openings 35A and 35B (FIG. 3) are formed on the first top plate portion 33, and a lid portion 5 for closing the openings 35A and 35B is further attached to the first top plate portion 33.

As shown in FIG. 3, the lid portion 5 is inserted with insertion holes 51 (8 in this embodiment) for inserting the fastening bolts 7 and positioning protrusions 341 arranged around the openings 35A and 35B. An insertion hole 52 is formed. Further, the first top plate portion 33 is provided with a screw hole 36 into which the fastening bolt 7 is screwed and a protrusion 341 for positioning the lid portion 5, which will be described later.

FIG. 4 is a schematic view of an inverter 2 constituting the rotary electric machine device 100 of the present embodiment. As shown in FIG. 4, the inverter 2 (power conversion device) has a power module 22 and a smoothing capacitor 25 arranged on a substrate 21.

The power module 22 is composed of a power transistor such as an IGBT (Insulated Gate Bipolar Transistor) and a feedback diode, and converts a direct current into an alternating current and converts an alternating current into a direct current by PWM (Pulse Wide Modulation) control. It is a thing. The power module 22 has bus bars 23U, 23V, and 23W as terminals connected to the motor side, and has bus bars P (not shown) and bus bars N (not shown) as terminals connected to the smoothing capacitor 25 side.

The smoothing capacitor 25 smoothes the direct current (direct current voltage) output from the power module 22, and has a bus bar 26P connected to a bus bar P (not shown) of the power module 22 and a bus bar N (not shown) of the power module 22. It includes a bus bar 26N connected to the outside (not shown) and bus bars 27P and 27N electrically connected to the outside (battery).

A terminal block 28 for fixing the bus bar 27P and the bus bar 4P, and the bus bar 27N and the bus bar 4N is arranged on the board 21. The terminal block 28 is formed with a screw hole (not shown) for screwing with the fastening bolt 29. Further, an insertion hole (not shown) through which the fastening bolt 29 is inserted is formed at the tip of the bus bars 27P, 27N and the bus bars 4P, 4N.

As an assembly process of the rotary electric machine 100 of the present embodiment, first, the inverter 2 is attached to the housing 1. At that time, the substrate 21 is attached to the housing 1, and the bus bars 23U, 23V, 23W of the inverter 2 are connected to the motor side. Next, the housing 3 is attached to the housing 1. At that time, the fastening bolt 6 (FIGS. 1 and 2) is inserted into the fixing portion 31 (protruding portion 311), and the fastening bolt 6 is screwed into the screw hole (not shown) formed in the housing 1 to form a housing. The body 3 is fixed to the housing 1.

When the inverter 2 and the housing 3 are attached to the housing 1 as described above, as shown in FIG. 4, the openings 35A and 35B of the housing 3 are visible so that the terminal block 28 (fastening bolt 29) can be visually recognized in a plan view. (Indicated by a broken line) is placed. Further, the bus bars 4P and 4N electrically connected to the battery (not shown) are inserted through the insertion holes 32A and 32B (see FIGS. 1 to 3 and 8) formed in the housing 3 and are inserted into the terminal block 28, respectively. Can be accessed. Therefore, the fastening operation can be performed by inserting a tool for fastening the fastening bolt 29 from the openings 35A and 35B.

Therefore, the insertion hole of the bus bar 27P and the insertion hole of the bus bar 4P are communicated with one screw hole (not shown) of the terminal block 28, and the insertion hole of the bus bar 27N and the insertion hole of the bus bar 4N are connected to the other screw hole of the terminal block 28. The fastening bolt 29 is screwed into the two screw holes (not shown) of the terminal block 28 in a state of being communicated with (not shown). As a result, the bus bar 27P and the bus bar 4P are fixed to each other, the bus bar 27N and the bus bar 4N are fixed to each other, and the power module 22 (and the smoothing capacitor 25) and the external battery (not shown) are electrically connected to each other. be able to.

After the fastening work, the openings 35A and 34B are closed by the lid portion 5, and the lid portion 5 is fixed to the housing 3 by using the fastening bolt 7 (fastening portion). This completes the assembly process. As another work using the openings 35A and 35B, for example, when a fuse (not shown) is mounted on the inverter 2, there is a work of replacing the fuse.

By the way, when the motor is driven, the vibration due to the rotation propagates to the housing 3 via the housing 1, but at that time, an abnormal noise may be generated from the housing 3. However, the present embodiment has a configuration for reducing the abnormal noise as described below.

FIG. 5 is a plan view of the housing 3 constituting the rotary electric machine device 100 of the present embodiment. FIG. 6 is a bottom view of the housing 3 constituting the rotary electric machine device 100 of the present embodiment. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a cross-sectional view taken along the line BB of FIG.

As shown in FIG. 5, the first top plate portion 33 includes a boss portion 34 and a connecting portion 37. The boss portion 34 includes a screw hole 36 (fastening portion) arranged around the openings 35A and 35B, and a protrusion 341. The openings 35A and 35B each have an oval shape with the Y-axis direction as the longitudinal direction, and are arranged side by side in the Y-axis direction. A plurality of screw holes 36 (8 in the figure) are arranged so as to orbit around the openings 35A and 35B, respectively. The protrusions 341 are arranged at a position adjacent to the opening 35A and a position adjacent to the opening 35B.

In the present embodiment, the screw holes 36 (areas) in the specific area 8 (area) on the housing 3 sandwiched between the pair of fixing portions 31A and 31C arranged on the + X-axis side of the side wall of the housing 3 in a plan view. A plurality of fastening portions) (4 in FIG. 5 and the like) are arranged.

The vibration generated by the motor propagates to the fixed portion of the housing 1 and the housing 3, that is, the fixed portion 31, and this propagates along the side wall to the top plate of the housing 3 (first top plate portion 33, second top plate portion 38). Propagation to, and abnormal noise due to vibration may be generated on the top plate. In particular, the difference in the second top plate portion 38 (or the first top plate portion 33) due to the component of the vibration propagated in the specific region 8 between the pair of fixed portions 31A and 31C in the housing 3 in a plan view. The sound may be noticeable.

However, in the present embodiment, the screw hole 36 (fastening portion) is formed in the specific region 8. A fastening bolt 7 (fastening portion) and a lid portion 5 are fixed to the screw hole 36. Therefore, the rigidity of the specific region 8 between the pair of fixed portions 31A and 31C (for example, the rigidity of the top plate with respect to the vibration of the amplitude in the Z direction) is improved, so that the generation of abnormal noise can be suppressed. In particular, by arranging the screw holes 36 (fastening portions) so as to line up in the Y-axis direction (longitudinal direction of the specific region 8), the rigidity of the specific region 8 can be improved and the generation of abnormal noise can be further suppressed. ..

Here, the specific region 8 corresponds to, for example, an inner portion of a rectangular parallelepiped or a rectangular parallelepiped surrounded by a chain line in the housing 3 as shown in FIGS. 5 to 8. Further, the specific region 8 has a longitudinal direction in the Y-axis direction with the position from the end in the + X-axis direction to the end in the −X-axis direction of the pair of fixed portions 31A and 31C (rib portions 313) as short sides. Although it may be a region, the length of the short side may be further extended in the X-axis direction at a constant ratio (for example, 20%).

When the specific area 8 is considered as a rectangle shown in FIG. 5, it is a requirement that the screw hole 36 (fastening portion) is arranged in the specific area 8 in a plan view. Further, when the specific area 8 is considered as a rectangular parallelepiped shown in FIGS. 5 to 8, it is a requirement that the screw holes 36 are actually arranged inside the specific area 8.

As shown in FIGS. 7 and 8, a step portion 39 is arranged between the first top plate portion 33 and the second top plate portion 38, and the connecting portion 37 between the step portion 39 and the first top plate portion 33 is provided. You are connected. Here, the step portion 39 is arranged so as to be included in the specific region 8 like the screw hole 36 (fastening portion). Further, the second top plate portion 38 is arranged so as to be higher than the first top plate portion 33 (connection portion 37), and the main surface of the step portion 39 faces the + X axis side.

The boss portion 34 is arranged so that at least a part (in FIG. 5, a region on the −X-axis side of the openings 35A and 35B and including the screw hole 36) is included in the specific region 8. Further, the boss portion 34 is arranged so as to be higher than the connecting portion 37.

As a result, in the specific region 8 in the drawing, a step portion 39 (crease) extending in the Y-axis direction is formed on the top plate of the housing 3, and the rigidity of the housing 3 is improved as compared with the case where the top plate has no crease. Therefore, it is possible to reduce the abnormal noise that may occur in the housing 3. Further, the rigidity of the portion where the boss portion 34 is arranged in the specific region 8 is improved, and thereby the abnormal noise that may occur in the housing 3 can be reduced.

In this embodiment, either one of the step portion 39 and the boss portion 34 may be formed, or neither of them may be formed. Further, the height of the second top plate portion 38 may be lower than the height of the first top plate portion 33. In this case, the main surface of the step portion 39 faces the −X axis side.

Further, as shown in FIGS. 6-8, the inside of the specific region 8 and inside the housing 3 (the back side of the top plate) extends in the Y-axis direction (direction along the longitudinal direction of the specific region 8). Ribs 391 are formed. The internal rib 391 can also improve the rigidity of the specific region 8 and suppress the generation of abnormal noise.

[Effect of this embodiment]
According to the rotary electric machine device 100 of the present embodiment, the housing 1 accommodating the rotary electric machine (motor), the power conversion device (inverter 2) attached to the housing 1 and connected to the rotary electric machine (motor), and the power conversion A rotary electric device 100 including a housing 3 attached to a housing 1 so as to cover the device (inverter 2). The housing 3 includes a component (bus bar 4P, Openings 35A and 35B for mounting the 4N (fuse) are formed, and a plurality of fixing portions 31 for fixing the housing 3 to the housing 1 and the openings 35A and 35B are arranged around the openings 35A and 35B. , A plurality of fastening portions (screw holes 36) for fastening the lid portions 5 for closing the openings 35A and 35B, and the plurality of fixing portions 31 are one side wall of the housing 3 and one side thereof. The fastening portion (screw hole 36) includes a pair of fixing portions 31A and 31C provided on the other side wall facing the side wall of the housing 3 and facing each other, and the fastening portion (screw hole 36) is between the pair of fixing portions 31A and 31C in the housing 3 in a plan view. A plurality of regions are arranged in the region (specific region 8) sandwiched between the two.

According to the above configuration, the fixed portion 31 (fixed portion 31A, 31C) is a portion where vibration first propagates from the housing 1 (motor), but is sandwiched between the pair of fixed portions 31A, 31C in the housing 3 in a plan view. Since the rigidity of the region (specific region 8) is improved by the fastening portion (screw hole 36), abnormal noise that may occur in the housing 3 (particularly the top plate) can be reduced.

In the present embodiment, the fixing portion 31 includes a protruding portion 311 that protrudes from the side wall and is fixed to the housing 1, and a rib portion 313 that protrudes from the side wall and connects to the protruding portion 311. As a result, the rigidity between the fixing portion 31 and the side wall of the housing 3 can be improved, and the abnormal noise that may occur in the housing 3 can be reduced.

In the present embodiment, the region (specific region 8) has a longitudinal direction in which the pair of fixing portions 31A and 31C are connected to each other (Y-axis direction), and a plurality of fastening portions (screw holes 36) are arranged along the longitudinal direction. Has been done. As a result, the rigidity of the region (specific region 8) where the vibration propagating through the fixed portions 31A and 31C is concentrated can be effectively improved, and the abnormal noise that may occur in the housing 3 can be reduced.

In the present embodiment, the housing 3 has a first top plate portion 33 including openings 35A and 35B and a fastening portion (screw hole 36), and a second top plate portion having a height different from that of the first top plate portion 33. The step portion 39 including the 38 and the step portion 39 connecting the first top plate portion 33 and the second top plate portion 38 is included, and the step portion 39 is arranged inside the region (specific region 8) in a plan view. As a result, a step portion 39 (crease) extending in the Y-axis direction is formed on the top plate of the housing 3 in the region (specific region 8), and the rigidity of the housing 3 is improved as compared with the case where the top plate has no crease. , The abnormal noise that may occur in the housing 3 can be reduced.

In the present embodiment, the housing 3 includes openings 35A and 35B and fastening portions (screw holes 36), and is a boss portion arranged so as to protrude from the top plate (first top plate portion 33) of the housing 3. 34 is included, and at least a part of the boss portion 34 is included in the region (specific region 8) in a plan view. As a result, the rigidity of the portion where the boss portion 34 is arranged in the region (specific region 8) is improved, and thereby the abnormal noise that may occur in the housing 3 can be reduced.

1 Housing 2 Inverter 3 Housing 31 Fixed part 31A Fixed part 31C Fixed part 36 Screw hole 4P Bus bar 4N Bus bar 5 Lid part 8 Specific area

Claims (5)

A housing that houses a rotary electric machine and
A power conversion device attached to the housing and connected to the rotary electric machine,
A rotary electric device including a housing attached to the housing so as to cover the power conversion device.
The housing has
An opening for attaching parts to the power conversion device is formed, and at the same time, an opening is formed.
A plurality of fixing portions for fixing the housing to the housing,
A plurality of fastening portions, which are arranged around the opening and for fastening a lid portion for closing the opening, and include a plurality of fastening portions.
The plurality of the fixing portions are
The housing includes one side wall and a pair of fixing portions provided on the other side wall facing the one side wall and facing each other.
The fastening part is
A plurality of rotary electric devices arranged in a region sandwiched between the pair of fixed portions in the housing in a plan view. The rotary electric device according to claim 1, wherein the fixing portion includes a protruding portion that protrudes from the side wall and is fixed to the housing, and a rib portion that protrudes from the side wall and connects to the protruding portion. In the region, the direction connecting the pair of the fixing portions to each other is the longitudinal direction.
The rotary electric device according to claim 1 or 2, wherein a plurality of fastening portions are arranged along the longitudinal direction. The housing includes a first top plate portion including the opening and the fastening portion, a second top plate portion having a height different from that of the first top plate portion, and the first top plate portion and the second top plate portion. The rotary electric device according to any one of claims 1 to 3, which includes a step portion connecting to a top plate portion, and the step portion is arranged inside the region in a plan view. The housing includes the opening and the fastening portion, and also includes a boss portion arranged so as to protrude from the top plate of the housing.
The rotary electric device according to any one of claims 1 to 4, wherein at least a part of the boss portion is included in the region in a plan view.

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